All Things Mk5 > Performance Modifications
Quite induction
Molesy:
--- Quote from: Pudding on December 14, 2017, 03:57:21 pm ---Yeah 4th is best as it's a 1:1 ratio, so takes gearing out of the equation. As Dan says, you need to keep the pedal pinned because the boost varies with pedal position.
Popped up to AKS today and got the Revo Stage 2+ done. B9, T4, F8.
Initially I was surprised how flat it felt compared to my custom map. Quite a marked difference in pedal punch. The Revo needs a much harder shove on the pedal to get the same sensation of midrange thump, despite going with the default non-linear pedal map. There was no timing pull on the test runs apparently and Vince there said it was quick, so I guess that's how it is.
During the 80 mile journey home, I got used to it and it's way smoother at part throttle and the 2500-3000 surging has gone. I think because it's smoother, it can be perceived as being slower, but the mph needle flies round just as quick as before. I'm not dissapointed, it's a really good map......I was expecting it to be more aggressive. I will play with the settings. I might back the boost off and add timing.
What do the numbers add/subtract in real terms? Say, going from T1 to T9, how many degrees of advance does it add, and is it across the whole map or just in boost?
The Revo intake is a lot quieter with their own software, which is a nice, but unexpected bonus!
Another plus point is an annoying jolt coming on/off the throttle around town has completely gone. Go Revo :happy2:
--- End quote ---
Nice one Pudding, I found it very similar with my Stage 1 recently with how progressive it is with the pedal and so much smoother power delivery!
Bodyboarder81:
@Pudding
The surging you talk about .... pretty sure I get this with mine , I’ve heard it mentioned before . Something to do with too much boost for the engine to cope with at lower rpm ‘s ? Does the upgraded pump sort this then ?
Glad your happy with the map /money spent , always nice when it turns out good :happy2:
pudding:
The KO4 turbo has a spool up/flow characteristic that overwhelms the engine at a certain load / rpm point, which is between 2500-3000rpm with 50-75% throttle and 20+psi.
Best way I can describe it is......nail it at 2500 and it goes like a stabbed rat for a second or 2, then hits the mega flat spot and stutters, then takes off again.
If you have an open cone intake, you can also hear the turbo fluttering badly between those rpms.
A lot of tuners reduce the boost in that region to get around that. Some complain the car feels slower as a result, but smoother boost delivery is faster than wheel spin, or a huge flat spot!
Revo have tuned that area very nicely. No issues there at all, but they are running a lot less boost there than the old map :smiley: I would be surprised if yours has KO4 surging to be honest. It could just be less responsive in that area because they dialled the boost back, which makes you think it's surging? Have you got the Loba pump?
Bodyboarder81:
It’s just it does a pulse/surge type thing like you’ve explained .... didn’t hear it as much with the standard air box but with the revo induction on you can hear it . No don’t have the Loba .... wasn’t planning on fitting one to be honest but just curious if this helps with the surging
AJP:
--- Quote from: Bodyboarder81 on December 14, 2017, 08:20:07 pm ---It’s just it does a pulse/surge type thing like you’ve explained .... didn’t hear it as much with the standard air box but with the revo induction on you can hear it . No don’t have the Loba .... wasn’t planning on fitting one to be honest but just curious if this helps with the surging
--- End quote ---
A few turbo builders do a K04 with an anti-surge wheel. I've seen a few graphs of 2+ setups with this and the torque from low to mid looks really impressive. Not just getting rid of the flat spot but the initial spool almost looks comparable to a K03. Mapping doesn't need to be compromised - the tuner has much more to play with in terms of ramp up etc. It's something I've always kept in mind if and when I go K04 on my GTI. I'd love a setup that picks up just as well but doesn't give up on boost from 4-5k like the little K03 does.
Kev, glad you're happy with the Revo map. You've had a while of tinkering with the software so hopefully this is closer to what you want and you can perfect it with the SPS. Let me know how you get on!
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