GolfGTIforum.co.uk
Model specific boards => Golf mk4 => Topic started by: new to vw on 17 May 2011, 23:35
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a standard exhaust, has anyone done it if so what were the gains... :grin: :grin:
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a standard exhaust, has anyone done it if so what were the gains... :grin: :grin:
I believe the exhaust will not hold it back much, however it is better to fit the exhaust 1st if you are planning on changing it as if you fit it later you may need the remap tweaking to get the most gains from it.
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Nice one bud.....will give RTECH a call and get there advice as well.. :grin: :grin:
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Loads of people remap with the standard exhaust. The biggest restriction is your CAT. Get a sports cat to free up the mid range
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And quicker than a standard GTI :grin: :grin: :grin:
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Loads of people remap with the standard exhaust. The biggest restriction is your CAT. Get a sports cat to free up the mid range
+1
:cool:
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How much is a sports cat?
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How much is a sports cat?
too much..just get a de-cat for sub £100 and save the rest for a to buy a drink for your local MOT station :lipsrsealed:
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How much is a sports cat?
too much..just get a de-cat for sub £100 and save the rest for a to buy a drink for your local MOT station :lipsrsealed:
:lipsrsealed: They are doing roadside tests these days.
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Milltek around £450 fitted
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Interesting views guys.....I would have thought the std exhaust would have been to restrictive to get a decent increase in power.......
Would/could the standard cat from a TT 225 or LCR fit or be made to fit the std exhaust system on a GTI.?? As the AUM cant get to anywhere near that sort of power without big mods..???
Might have to start looking on bay ect.. :grin: :grin:
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The TT 225 and LCR have a Ko4 as standard IIRC. Not the exhaust that makes the gain. I got 221 bhp from just an intake, sports cat, 007p, TIP and Ko3s. Adding the FMIC and cat back only got me to 236. Really not worth the extra gold mate unless your backbox rots out.
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150bhp & 225bhp Not the same turbos, engines or software
The p eak power all about efficientl air flow, engine comperssion ratio, cylinder head dynamics, turbo volumetric flow rate toproduce enough forced air efficiently without lost energy from heat build up.
On the 150 1.8T its the downpipe and cat which is the real power killer, poor flow and builds heat up really bad. Some tuners can only get 190-200bhp from a stock AUM dp/cat due to heat build up, but get the fuel and timing correct by usings the ME7.5 ECUs cylinder wall wetting /cooling stratergy (for thermal component protection) by using the extra fuel as a combustion coolant then you can get the heat down and easy tune to 210-212bhp safe all day long.
The later TT/LCR and S3 K04 engine all utilised a EGT probe in the manifold to allow the ECU calibrators to get thermal protection mapping balanced right for, Best fuel mix for power, best fuel mix for torque, best burn for thermal protection, and best fuel for carbon foot print emissions. :smiley:
The AUM ecus only use an EGT lookup table maps based on theory under certain conditions, which means to map correct a hell of a lot of time datalogging with a external egt probe is needed to rescale the egt model for 200bhp+ and/or sports or decat.
My documents to study just the 1.8T ecu which I use total 3600 pages just in 2 PDF files, So getting ot right and safe in easy if you go that extra mile to fully understand the ecu and car your working on.