MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: muff1991 on November 19, 2018, 01:37:34 pm

Title: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: muff1991 on November 19, 2018, 01:37:34 pm
hi all, still chasing turbo flutter (as well as small rev hang) on my GTI. I cant figure out what it is... I'm now wondering if the solenoid on the DV isn't pulling the DV back when I lift off the throttle and that's what's causing the flutter? its such a pathetic flutter too.. I don't want it fluttering..! would of thought i'd get a code or something but nothing. holds boost ok.

its had a new Rev G and made no difference. I've checked all the obvious stuff.. but any ideas please shout out :)

I was wondering if there's a fuse for the solenoid or any other reasons what and why its fluttering. its done it since I brought the car but my last one didn't do it!

yes I have a Ram air intake... but I've said in a previous post.. my cousins and my mates GTI with the same intake doesn't make this fluttering noise.. they just get woosh at most.

any advise or a point will be great please.

Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: pudding on November 23, 2018, 10:25:34 am
I'm guessing it's mapped?  Fluttering during acceleration or only when letting off the gas?
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: muff1991 on November 23, 2018, 12:11:01 pm
I'm guessing it's mapped?  Fluttering during acceleration or only when letting off the gas?

Hey Pudding, not mapped yet as want it perfect before doing so! Its fluttering as you lift off the throttle. you can sometimes hear it flutter then dv pshhh but the pshh is very faint the flutter is loud.
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: pudding on November 23, 2018, 01:29:30 pm
Yeah that's normal mate.  The factory airbox absorbs that sound.  It shouldn't be excessive though, just a couple of cha cha noises.  Maybe the DV isn't responding quickly enough.
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: Dave aka on November 23, 2018, 02:18:58 pm
Just to confirm he’s running nearly the same mods as my gti had a few years back and mine didn’t drive or sound nothing like his, power drops off like the Pcv or dv valve is broke but both have replaced, no real boost leak issues (well with the bayonets and standard intercooler on the gti’s that’s a lie lol) the car drops out of the power for roughly 2-2.5k on the revs then power returns immediately and pulls hard, it’s making a wooooo noise Not dv related like air is hissing out but no visible boost leaks anywhere, it’s not throwing a light on.......think its gonna have to be Vag com next mate start looking at measuring blocks........again 😎👍🏻
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: muff1991 on November 23, 2018, 02:34:11 pm
in all fairness the noises etc. was all happening before i started experiencing power cuts. i understand what you're saying pudding.. but i find it hard to believe this to be the induction kit. as you said it shouldn't be excessive.. but in my opinion its very loud! Aka's BWA don't/didn't do it and nor does my mates! AXX (same setup as me - apart from i have a backbox delete? only difference)

I have a sound recording but don't know how to upload it??? (its not very good but will sound closer than my chirps... squeal... chatter words lol)
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: pudding on November 23, 2018, 03:40:36 pm
Sorry, should have been more clear.  The intake doesn't cause the noise, it just reveals/amplifies it.  Any changes in the exhaust and intake can affect how the turbo spools, but deleting the back box shouldn't affect things drastically.  If there's a big power drop, I think it's time to crack open the laptop and start logging the usual measuring blocks.  MAF, low and high pressure fuel pumps, lambda, boost pressure etc etc.

You can upload it to somewhere like flickr or photobucket and link to it in this thread.
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: muff1991 on November 24, 2018, 12:12:58 pm
Sorry, should have been more clear.  The intake doesn't cause the noise, it just reveals/amplifies it.  Any changes in the exhaust and intake can affect how the turbo spools, but deleting the back box shouldn't affect things drastically.  If there's a big power drop, I think it's time to crack open the laptop and start logging the usual measuring blocks.  MAF, low and high pressure fuel pumps, lambda, boost pressure etc etc.

You can upload it to somewhere like flickr or photobucket and link to it in this thread.
Cheers pudding. I’ll get the sound clip added on here via one of those, just so you can hear what it sounds like. I would defo say it’s not the normal noises you’d expect to hear and if so it’s ridiculously amplified lol it’s almost like the DV valve isn’t opening to allow recirculation or something but the flutter is pathetic
After reading a few things I reckon the power loss problem at 4K might be down to the N75 valve. It’s like the car goes into soft limp mode for a second or 2 then works out what it needs to do then goes like stink right up past that! I know VCDS is probably the only way of telling truly. I want to invest after xmas 100%


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Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: Dave aka on November 25, 2018, 07:30:23 am
N276 valve you animal!!  and I’ve got a spare for you to try mate and any other sensor you need 😂😂😂 I literally feel like every part you ask for I’ve got as a spare.....water hose, clips, boost seals, nuts bolts, bushings let’s be honest mate I’ve a cars worth of spares even if it’s a leak from the cam chain cover lol I’ve got you covered bro, cracked manifold I’ve got a spare, turbos leaking you know what I’m gonna say 😂😂😂 I’ve got u covered bro 😎👍🏻
It’s just the diagnosis/finding the fault that will take the time.......the engine is solid it’s just a teething issue, at least it’s not clutch/csc related 😱😑
Anyway drop a cdl in it and then the noise will stop 100% only thing then screaming will be me in the passengers seat 😝
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: muff1991 on November 25, 2018, 07:41:59 am
N276 valve you animal!!  and I’ve got a spare for you to try mate and any other sensor you need I literally feel like every part you ask for I’ve got as a spare.....water hose, clips, boost seals, nuts bolts, bushings let’s be honest mate I’ve a cars worth of spares even if it’s a leak from the cam chain cover lol I’ve got you covered bro, cracked manifold I’ve got a spare, turbos leaking you know what I’m gonna say I’ve got u covered bro
It’s just the diagnosis/finding the fault that will take the time.......the engine is solid it’s just a teething issue, at least it’s not clutch/csc related
Anyway drop a cdl in it and then the noise will stop 100% only thing then screaming will be me in the passengers seat
Haha AKA you’re the man we’ll get it sorted one way or another


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Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: muff1991 on November 26, 2018, 03:27:58 pm
Sorry, should have been more clear.  The intake doesn't cause the noise, it just reveals/amplifies it.  Any changes in the exhaust and intake can affect how the turbo spools, but deleting the back box shouldn't affect things drastically.  If there's a big power drop, I think it's time to crack open the laptop and start logging the usual measuring blocks.  MAF, low and high pressure fuel pumps, lambda, boost pressure etc etc.

You can upload it to somewhere like flickr or photobucket and link to it in this thread.

https://vocaroo.com/i/s0tanvQSMInM

providing the link works, let me know what you all think this noise could be (its not the best sound clip but its close enough) different throttle position release at different rpm determines the noise. but what you're hearing is simply throttle release. I'm not tapping throttle again to cause this flutter/surge/chirping. let me know, thanks.

main chatter spoken about can be heard from 16 seconds.
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: muff1991 on November 30, 2018, 10:35:21 am
does anyone recognize the noise? it's doing my head in lol

https://vocaroo.com/i/s0tanvQSMInM
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: mjmallia on November 30, 2018, 10:48:50 am
Sounds fine to me if a CAI is on.
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: muff1991 on November 30, 2018, 03:02:35 pm
i just find it so hard to believe this to be the CAI when others don't do it  :thinking:
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: pudding on November 30, 2018, 03:06:20 pm
Sounds normal to me mate.  It's just resonance in the drain pipe mate and nothing to worry about.  Just tell your mates your GTI sounds like a Bugatti Chiron  :happy2:

The engine falling on it's face at 4K is a problem that needs looking into though.  You do need VCDS unfortunately as there are too many parameters to monitor at once, which is impossible to do on a phone with an app.
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: muff1991 on November 30, 2018, 03:09:44 pm
thanks for your input pudding... I'm in the process of building a Boost leak tester, so ill check for boost leaks for sure and then @Dave aka (http://www.mk5golfgti.co.uk/forum/index.php?action=profile;u=27661) got a spare N75 valve so I'm going to rule that out too as read online it could be that. cheers
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: pudding on November 30, 2018, 03:57:57 pm
A cheap mechanical gauge gaffer taped to the windscreen is a sound idea  :happy2:
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: muff1991 on November 30, 2018, 04:26:31 pm
I'm on it.. .cheers Pudding :)
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: pudding on November 30, 2018, 04:59:34 pm
Mechanical is better as you can see the boost fluctuations easier.  Digital gauges are just numbers flying around.  Can't beat an old school pointer!  Where are you based?
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: muff1991 on December 01, 2018, 06:13:47 am
Mechanical is better as you can see the boost fluctuations easier.  Digital gauges are just numbers flying around.  Can't beat an old school pointer!  Where are you based?
I’m based in Berkshire & Buckinghamshire you?
Totally agree, don’t like the digital at all!! I ordered a cheap sweeper... comes with hose and all that just need to get a T-piece


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Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: Dave aka on December 02, 2018, 08:57:57 am
I’m convinced my cam chain cover gasket is leaking and I know where from, that one t30 bolt at 6 o’clock on the cam chain cover, gonna take the vacuum pump off and pinch all the bolts up again as I’m sure the bottom ones gonna be semi loose (hate tightening in to alloy) gonna see if that’s why my cam position sensor has oil on it from time to time but I can clearly see a leak now.......if this don’t work.......I will replace the engine


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Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: pudding on December 07, 2018, 05:28:22 pm
Mechanical is better as you can see the boost fluctuations easier.  Digital gauges are just numbers flying around.  Can't beat an old school pointer!  Where are you based?
I’m based in Berkshire & Buckinghamshire you?
Totally agree, don’t like the digital at all!! I ordered a cheap sweeper... comes with hose and all that just need to get a T-piece

I'm miles away, in Suffolk.  I was going to have a listen to your car and scan it if you were local!
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: muff1991 on December 07, 2018, 08:38:20 pm
Mechanical is better as you can see the boost fluctuations easier.  Digital gauges are just numbers flying around.  Can't beat an old school pointer!  Where are you based?
I’m based in Berkshire & Buckinghamshire you?
Totally agree, don’t like the digital at all!! I ordered a cheap sweeper... comes with hose and all that just need to get a T-piece

I'm miles away, in Suffolk.  I was going to have a listen to your car and scan it if you were local!
Proper shame pudding, thanks very much for the offer though. I wish you could hear it in person just to understand me more as the sound clip really doesn’t do it justice. I’ll lay money on it being abnormal lol. The more I think about it, the more it just seems like the air isn’t diverting (when coming off throttle) I have all sorts of bits to try this weekend if it ain’t raining . But will report back with good or bad news. Cheers.


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Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: pudding on December 08, 2018, 11:47:42 am
Good luck mate!  If the air isn't being dumped at all, or only partially, the Mr Turbo won't like it and make all sorts of noises!

Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: muff1991 on December 10, 2018, 08:50:26 am
so i run into a little trouble over the weekend...

firstly I done a boost leak test: removed the rear pcv hose and bunged it... took CAI off and inserted my boost leak tester pre turbo... with the gauge from my tyre pump it was hardly giving me a reading of around 10 psi I had to really leave it pumping for a while to build pressure and I mean ages!
I have temporarily fitted a PCV delete at the front (process of elimination), so the intake manifold has the little metal bung on (held on with a clip) and this was leaking a tiny bit of air... so maybe that's why it was struggling to rise in pressure. I will sort that out!
But... I also run my "cheap mechanical gauge" off a nipple on this bung and when I got the pump gauge up to 20psi this gauge off manifold read around 10-12psi, I could not work this one out! one of those gauges has to be wrong.. or I am doing something wrong!
I could also hear loads of oil gurgling and dripping within the engine (oil cap was removed) I'm still waiting on my pressure gauge to arrive so I can fit to my boost leak tester so will do this again and sort that first leak out. Pressure really had to try to build unlike when I pump tires lol now I'm not sure if this is a good thing as in... am I on route to the cause of my issue here, or is the DV blocking off... allowing the nearest gauge to read 20psi and the furthest on the opposite end of the system to read 10psi.

I needed the ignition on in order to use the tyre pump so not sure if that hasn't helped and making the DV shut but then it should be released right.

also wondering - does anyone know if the Diverter Valve can be turned off using VCDS as I know a few features have been played around with by previous owner?
 
absolutely kicking myself too... when I was fitting the rear pcv hose (was a pig and I've had it on and off before!!) I bloody snapped the little rear hose nipple next to it  :doh: luckily @Dave aka (http://www.mk5golfgti.co.uk/forum/index.php?action=profile;u=27661) has got his spare cover for me, so ill get all that sorted later this week!
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: pudding on December 14, 2018, 11:12:09 am
So you were pumping air into the engine to see if it held pressure?  A bit like a cylinder compression test?  I don't think you will get it to hold a pressure like that as the air path is huge, plus open valves, turbo and intercooler to fill etc etc.

You can use the mechanical boost gauge on the PCV delete nipple though  :happy2:   If you're looking for vac leaks, a smoke tester is best.  At a really cheap basic level, simply blow lots of cigar smoke into the turbo intake hose  :grin:  Or you can fairly cheap proper testers these days.....I think. Haven't looked in a while.

You can't disable any engine functions with VCDS.  You need to hack into the ECU software to do that.  If you're looking for DV solenoid activity, you could wire up a 12V LED across the 2 pins and tape it to the windscreen?  Lol, you'll have so much stuff taped to the screen you won't be able to see through it at this rate  :grin:
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: muff1991 on December 14, 2018, 07:51:34 pm
So you were pumping air into the engine to see if it held pressure?  A bit like a cylinder compression test?  I don't think you will get it to hold a pressure like that as the air path is huge, plus open valves, turbo and intercooler to fill etc etc.

You can use the mechanical boost gauge on the PCV delete nipple though  :happy2:   If you're looking for vac leaks, a smoke tester is best.  At a really cheap basic level, simply blow lots of cigar smoke into the turbo intake hose  :grin:  Or you can fairly cheap proper testers these days.....I think. Haven't looked in a while.

You can't disable any engine functions with VCDS.  You need to hack into the ECU software to do that.  If you're looking for DV solenoid activity, you could wire up a 12V LED across the 2 pins and tape it to the windscreen?  Lol, you'll have so much stuff taped to the screen you won't be able to see through it at this rate  :grin:
Pudding... I can’t read more than 2-3 post of yours without coming across one that cracks me up! The 12v LED is a good idea! Good thinking! I disconnected my DV and took the car for a drive... the throttle response was a bit rubbish as expected. But the flutter sounds wasn’t hardly any worse! It was a liiittle bit worse but not that bad!

I was trying to do a boost leak test... so I pushed air from the turbo inlet all round the charge air system into the inlet manifold. Found a small leak on the inlet manifold where the pcv block  off bit plugs onto. But couldn’t find anything else. And yes because the valves and stuff were open the air was probably going straight through... next time I do it, I’m going to take the throttle body pipe off and block it. So there’s only start to finish from the turbo inlet to the TB inlet.

I’m mainly trying to test for vac leaks and boost leaks... also wanted to see/hear if there was any air coming out the N75 valve hoses. As I’m convinced all these issues I’m having has something to do with it.

As mentioned in my other post... I’m planning on getting vcds next month. So will knock on you all on how to use it properly haha. But hopefully it might point me in the right direction.

Cheers


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Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: pudding on December 14, 2018, 09:03:32 pm
So you were pumping air into the engine to see if it held pressure?  A bit like a cylinder compression test?  I don't think you will get it to hold a pressure like that as the air path is huge, plus open valves, turbo and intercooler to fill etc etc.

You can use the mechanical boost gauge on the PCV delete nipple though  :happy2:   If you're looking for vac leaks, a smoke tester is best.  At a really cheap basic level, simply blow lots of cigar smoke into the turbo intake hose  :grin:  Or you can fairly cheap proper testers these days.....I think. Haven't looked in a while.

You can't disable any engine functions with VCDS.  You need to hack into the ECU software to do that.  If you're looking for DV solenoid activity, you could wire up a 12V LED across the 2 pins and tape it to the windscreen?  Lol, you'll have so much stuff taped to the screen you won't be able to see through it at this rate  :grin:
Pudding... I can’t read more than 2-3 post of yours without coming across one that cracks me up! The 12v LED is a good idea! Good thinking! I disconnected my DV and took the car for a drive... the throttle response was a bit rubbish as expected. But the flutter sounds wasn’t hardly any worse! It was a liiittle bit worse but not that bad!

I was trying to do a boost leak test... so I pushed air from the turbo inlet all round the charge air system into the inlet manifold. Found a small leak on the inlet manifold where the pcv block  off bit plugs onto. But couldn’t find anything else. And yes because the valves and stuff were open the air was probably going straight through... next time I do it, I’m going to take the throttle body pipe off and block it. So there’s only start to finish from the turbo inlet to the TB inlet.

I’m mainly trying to test for vac leaks and boost leaks... also wanted to see/hear if there was any air coming out the N75 valve hoses. As I’m convinced all these issues I’m having has something to do with it.

As mentioned in my other post... I’m planning on getting vcds next month. So will knock on you all on how to use it properly haha. But hopefully it might point me in the right direction.

Cheers


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Yeah I'm a crazy fool  :grin:  Is it an OEM DV you're using? Rev G?  You could try disconnecting the N75 and see if you get spring pressure boost, which is about 8psi iirc.  If you reconnect it and get more boost, the N75 is fine  :happy2:  VCDS is king!  You can only get so fat without it  :smiley:
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: muff1991 on December 14, 2018, 11:02:19 pm
So you were pumping air into the engine to see if it held pressure?  A bit like a cylinder compression test?  I don't think you will get it to hold a pressure like that as the air path is huge, plus open valves, turbo and intercooler to fill etc etc.

You can use the mechanical boost gauge on the PCV delete nipple though  :happy2:   If you're looking for vac leaks, a smoke tester is best.  At a really cheap basic level, simply blow lots of cigar smoke into the turbo intake hose  :grin:  Or you can fairly cheap proper testers these days.....I think. Haven't looked in a while.

You can't disable any engine functions with VCDS.  You need to hack into the ECU software to do that.  If you're looking for DV solenoid activity, you could wire up a 12V LED across the 2 pins and tape it to the windscreen?  Lol, you'll have so much stuff taped to the screen you won't be able to see through it at this rate  :grin:
Pudding... I can’t read more than 2-3 post of yours without coming across one that cracks me up! The 12v LED is a good idea! Good thinking! I disconnected my DV and took the car for a drive... the throttle response was a bit rubbish as expected. But the flutter sounds wasn’t hardly any worse! It was a liiittle bit worse but not that bad!

I was trying to do a boost leak test... so I pushed air from the turbo inlet all round the charge air system into the inlet manifold. Found a small leak on the inlet manifold where the pcv block  off bit plugs onto. But couldn’t find anything else. And yes because the valves and stuff were open the air was probably going straight through... next time I do it, I’m going to take the throttle body pipe off and block it. So there’s only start to finish from the turbo inlet to the TB inlet.

I’m mainly trying to test for vac leaks and boost leaks... also wanted to see/hear if there was any air coming out the N75 valve hoses. As I’m convinced all these issues I’m having has something to do with it.

As mentioned in my other post... I’m planning on getting vcds next month. So will knock on you all on how to use it properly haha. But hopefully it might point me in the right direction.

Cheers


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Yeah I'm a crazy fool  :grin:  Is it an OEM DV you're using? Rev G?  You could try disconnecting the N75 and see if you get spring pressure boost, which is about 8psi iirc.  If you reconnect it and get more boost, the N75 is fine  :happy2:  VCDS is king!  You can only get so fat without it  :smiley:
Thanks for the tips mate, 100% getting genuine vcds end of jan. But I’ll defo give the N75 valve a play with! I have got a new one to fit but looks a right pig and some hours worth of work I ain’t got at the mo. Lol


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Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: muff1991 on December 14, 2018, 11:03:24 pm
So you were pumping air into the engine to see if it held pressure?  A bit like a cylinder compression test?  I don't think you will get it to hold a pressure like that as the air path is huge, plus open valves, turbo and intercooler to fill etc etc.

You can use the mechanical boost gauge on the PCV delete nipple though  :happy2:   If you're looking for vac leaks, a smoke tester is best.  At a really cheap basic level, simply blow lots of cigar smoke into the turbo intake hose  :grin:  Or you can fairly cheap proper testers these days.....I think. Haven't looked in a while.

You can't disable any engine functions with VCDS.  You need to hack into the ECU software to do that.  If you're looking for DV solenoid activity, you could wire up a 12V LED across the 2 pins and tape it to the windscreen?  Lol, you'll have so much stuff taped to the screen you won't be able to see through it at this rate  :grin:
Pudding... I can’t read more than 2-3 post of yours without coming across one that cracks me up! The 12v LED is a good idea! Good thinking! I disconnected my DV and took the car for a drive... the throttle response was a bit rubbish as expected. But the flutter sounds wasn’t hardly any worse! It was a liiittle bit worse but not that bad!

I was trying to do a boost leak test... so I pushed air from the turbo inlet all round the charge air system into the inlet manifold. Found a small leak on the inlet manifold where the pcv block  off bit plugs onto. But couldn’t find anything else. And yes because the valves and stuff were open the air was probably going straight through... next time I do it, I’m going to take the throttle body pipe off and block it. So there’s only start to finish from the turbo inlet to the TB inlet.

I’m mainly trying to test for vac leaks and boost leaks... also wanted to see/hear if there was any air coming out the N75 valve hoses. As I’m convinced all these issues I’m having has something to do with it.

As mentioned in my other post... I’m planning on getting vcds next month. So will knock on you all on how to use it properly haha. But hopefully it might point me in the right direction.

Cheers


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Yeah I'm a crazy fool  :grin:  Is it an OEM DV you're using? Rev G?  You could try disconnecting the N75 and see if you get spring pressure boost, which is about 8psi iirc.  If you reconnect it and get more boost, the N75 is fine  :happy2:  VCDS is king!  You can only get so fat without it  :smiley:
Thanks for the tips mate, 100% getting genuine vcds end of jan. But I’ll defo give the N75 valve a play with! I have got a new one to fit but looks a right pig and some hours worth of work I ain’t got at the mo. Lol


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And yes, replaced with a new genuine Rev G


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Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: pudding on December 17, 2018, 12:38:32 pm
Probably not the DV then.  FWIW I put a Rev D in mine the other week.  Everyone says they leak but mine hold boost just fine  :happy2:

Yeah the N75 is a pain to get at.  I think there was a revision on it, so if you bought one recently it will be the updated one!
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: muff1991 on December 18, 2018, 01:43:02 pm
Probably not the DV then.  FWIW I put a Rev D in mine the other week.  Everyone says they leak but mine hold boost just fine  :happy2:

Yeah the N75 is a pain to get at.  I think there was a revision on it, so if you bought one recently it will be the updated one!
I have a spare rev D so will wack that in and see if the noise changes.

Yeah brought it last week just need to find time to swap it but need to find out why the damn thing decides to cut out once started first.


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Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: Mr dsg on October 21, 2021, 11:10:31 am
I'm guessing it's mapped?  Fluttering during acceleration or only when letting off the gas?
did you find the issue in the end bud as I'm having the same issue
Title: Re: Turbo Flutter/Surge off throttle - DV solenoid?
Post by: Mr dsg on October 21, 2021, 11:28:58 am
hi all, still chasing turbo flutter (as well as small rev hang) on my GTI. I cant figure out what it is... I'm now wondering if the solenoid on the DV isn't pulling the DV back when I lift off the throttle and that's what's causing the flutter? its such a pathetic flutter too.. I don't want it fluttering..! would of thought i'd get a code or something but nothing. holds boost ok.

its had a new Rev G and made no difference. I've checked all the obvious stuff.. but any ideas please shout out :)

I was wondering if there's a fuse for the solenoid or any other reasons what and why its fluttering. its done it since I brought the car but my last one didn't do it!

yes I have a Ram air intake... but I've said in a previous post.. my cousins and my mates GTI with the same intake doesn't make this fluttering noise.. they just get woosh at most.

any advise or a point will be great please.



Hi mate did you focus the issue ad I'm having the same problem with my car