MK5 Golf GTI
All Things Mk5 => Mk5 General Area => Topic started by: Hurdy on November 10, 2009, 11:20:30 am
-
So, I've finally decided to get the car de-catted to free up some extra ponies and decrease spool up times.
Regal estimates 7-10 bhp extra.
Spoke to REVO this morning and the 2nd Lambda sensor isn't an issue if you are already rocking a stage 2+ remap as it allows for the sports cat/decat sensors :happy2:
Also they say that I will notice a significant amount of extra urge in the midrange through quicker spool up and less back pressure and a more urgent standing start :evilgrin:
Just what I need for the qtr mile stints.
Best of all - £100 fitted for a stainless insert with proper flanging to swap the cat and decat sections for track and road :notworthy:
I'll also get it back to Noble's to see what the differences are with just the decat over my last run a few weeks ago :happy2:
-
I thought a decat V sports cat actually didnt give much if any bhp atall, and infact is worse as it doesnt keep some of the vital back pressure needed?
-
A long read on the subject (http://my.prostreetonline.com/forums/archive/index.php?t-1639.htm)
Decats are very amusing, apparently... :innocent:
-
A long read on the subject (http://my.prostreetonline.com/forums/archive/index.php?t-1639.htm)
Decats are very amusing, apparently... :innocent:
Wow. good read! still going through it but cheers :congrats:
-
I'm not fully up to speed on the matter, but it's interesting reading.
-
Sports cat to de-cat isnt a huge difference.. I really doubt the 7-10bhp to be honest..
The biggest thing you will notice will be quicker spool and a more raspy exhaust note.. Still well worth doing though
-
Sports cat to de-cat isnt a huge difference.. I really doubt the 7-10bhp to be honest..
The biggest thing you will notice will be quicker spool and a more raspy exhaust note.. Still well worth doing though
For £100 it would be rude not to at least have a go :happy2:
If I only get quicker spool up it would still make a positive difference to available power and torque at any revs along the rev range, if not at the top :jumpmove:
-
I too doubt power hikes, however in a few weeks I'm on the same rollers as it was on when running S1 this time last year, so it'd be interesting to see how I've changed. Spool up RPM, power tail off, graph shape etc.. the figures themselves I think are pretty much meaningless.
Oh, and the 'zorst sounds like it has a wasps nest up there - goes from fizzy to screamy with extra loud Jonny style DSG bangs.
-
A long read on the subject (http://my.prostreetonline.com/forums/archive/index.php?t-1639.htm)
Decats are very amusing, apparently... :innocent:
Just going through this, Confuscious he say - velly intelesting :laugh:
-
I too doubt power hikes, however I'm on the same rollers as it was on when running S1 this time last year, so it'd be interesting to see how I've changed. Spool up RPM, graph shape etc.. the figures themselves I think are pretty much meaningless.
Oh, and the 'zorst sounds like it has a wasps nest up there - goes from fizzy to screamy with extra loud Jonny style DSG bangs.
DEFINITELY going on then :evilgrin:
-
Ha ha - I've non-res, so the sound pressure wave just goes inrestricted all the way before booming in the backbox.
I kid you not when I say it sounds like a rally slag. It is however silly loud in all honesty, I should buy a res section.
-
I like the sound of this! :evilgrin:
Can I ask the obvious question? What happens come MOT time? Will you have to keep swapping between the two pipes?
-
if vosa hear it your fooked :sad1: but the chances of that are slim but then again so many people run de cats now it would be rude not to
-
I have a freindly MOT tester Nath, so would only need to change it when I want to :wink:
Matt, I'd obviously only use it for trackdays and 1/4 mile days :wink: :innocent:
Mike, I'm fortunate enough to have the resonated zorst anyway :happy2:
-
Track days only, Mat - fortunately Milltek make them so well, they come off and on in minutes :wink:
Still passes noise regs at <101dB with no probs, but gives me a bit of a headache towards the end of the day.
-
I'll simply turn up my soundz if I get fed up of the zorst noise, but I doubt I will :driver:
-
ear plugs would help :evilgrin: mmm de cat mine :evilgrin: its loud now so de cat would be crazy loud
-
I have a freindly MOT tester Nath, so would only need to change it when I want to :wink:
Matt, I'd obviously only use it for trackdays and 1/4 mile days :wink: :innocent:
Mike, I'm fortunate enough to have the resonated zorst anyway :happy2:
Same here so linky please! :party: :evilgrin:
-
Isn't the point of a catalytic converter to reduce toxic emissions? So for the sake of possibly 7 bhp you're going to have a far louder and more polluting car? Gets the thumbs down from me I'm afraid.
-
Isn't the point of a catalytic converter to reduce toxic emissions? So for the sake of possibly 7 bhp you're going to have a far louder and more polluting car? Gets the thumbs down from me I'm afraid.
that is what it does there is no filter
-
Isn't the point of a catalytic converter to reduce toxic emissions? So for the sake of possibly 7 bhp you're going to have a far louder and more polluting car? Gets the thumbs down from me I'm afraid.
Depends on where and how you use it :smiley:
-
I have a freindly MOT tester Nath, so would only need to change it when I want to :wink:
Matt, I'd obviously only use it for trackdays and 1/4 mile days :wink: :innocent:
Mike, I'm fortunate enough to have the resonated zorst anyway :happy2:
Same here so linky please! :party: :evilgrin:
PM'd :smiley:
-
Isn't the point of a catalytic converter to reduce toxic emissions? So for the sake of possibly 7 bhp you're going to have a far louder and more polluting car? Gets the thumbs down from me I'm afraid.
That's a fair and valid point. I wonder if Hurdy can get an emmisions read out on the fitting day to see what the difference is?
-
Isn't the point of a catalytic converter to reduce toxic emissions? So for the sake of possibly 7 bhp you're going to have a far louder and more polluting car? Gets the thumbs down from me I'm afraid.
That's a fair and valid point. I wonder if Hurdy can get an emmisions read out on the fitting day to see what the difference is?
I'd have to see what the emissions are beforehand too, to make it a valid comparison.
However, you have to put this into context, my car on track won't be putting out half the sh!t that some larger, older cars will and on the 1/4 mile my car won't be using 0.048mpg like top fuel dragsters either. Yes I know about CO2 and NOX emissions and their detrimental effect on the planet, but power/performance = higher emissions, so does that mean anyone with a remap ought to be shot at dawn?
I understand Andrew's point of view though :happy2:
-
If pc plod wanted to be harsh he could whip out his emissions tester at the road side and deem your car unfit for road use .... :evilgrin:
-
If pc plod wanted to be harsh he could whip out his emissions tester at the road side and deem your car unfit for road use .... :evilgrin:
I think he could possibly do the same for yours and mine with the cat in place. :laugh:
-
I think you're assuming that the car won't pass an emmisions test, it might....
-
If pc plod wanted to be harsh he could whip out his emissions tester at the road side and deem your car unfit for road use .... :evilgrin:
I think he could possibly do the same for yours and mine with the cat in place. :laugh:
The difference is.. i would just drive off lol and not get caught in the 1st place :jumping: :P
-
If pc plod wanted to be harsh he could whip out his emissions tester at the road side and deem your car unfit for road use .... :evilgrin:
I think he could possibly do the same for yours and mine with the cat in place. :laugh:
The difference is.. i would just drive off lol and not get caught in the 1st place :jumping: :P
But they would catch you before me :P :grin:
-
If pc plod wanted to be harsh he could whip out his emissions tester at the road side and deem your car unfit for road use .... :evilgrin:
I think he could possibly do the same for yours and mine with the cat in place. :laugh:
The difference is.. i would just drive off lol and not get caught in the 1st place :jumping: :P
But they would catch you before me :P :grin:
beg to differ, never the less "Touché" ;)
-
funny thing is i drove past a on the road emissions testing van that had the probes sticking into the road next to the van and had the cops a few yards down the road pulling cars new and old
-
Isn't the point of a catalytic converter to reduce toxic emissions? So for the sake of possibly 7 bhp you're going to have a far louder and more polluting car? Gets the thumbs down from me I'm afraid.
What a prude.
You sound like my mum :P
The fact of the matter is though, even if you took every car in the world off the road it would make Sweet FA difference to the supposed man made global warming.
:smiley:
-
do we have any pics of this decat insert. when is it going on? plus will you be getting it dyno'd straight after
-
I'm back at Statllers on Monday and it will get hoisted onto the lift for some pics :happy2:
i'll also be getting a dyno run carried out back at Nobles, but it will not be a direct comparison as I've done a few other mods whilst the car was in dock for the Quaife :wink: :innocent:
-
If I only get quicker spool up it would still make a positive difference to available power and torque at any revs along the rev range, if not at the top :jumpmove:
It'll also allow alittle more ignition advance to be mapped in without det creeping in, in a higher rpm/prolonged high spped run.