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I have been quoted £550 for this for my ev 8 which i thought was a good price :confused:

Thing is do you guys think its worth me taking out the cat for this mapping and would i see better performace with no cat???


:confused:
 

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i was advised by chris at wrc tech to fit a decat before they remap my car , he said that it would make a difference of 10 to 15 bhp. since i don't know to much about tuning i'm happy to follow his advise.
 

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from what i've been told changing the exhaust,down pipe and fitting a decat will make the engine breath better, so because of this the boost is increased.(that is why some people experience fuel cuts) but how this helps when you have a remap i'm not quite sure, i can only guess that it will allow them to run the car at a higher boost level.
hopefully someone who knows what they are talking about wiil stumble on this thread and shed some light.
 

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Hi All,

Just to fill in the details. On a turbocharged vehicle, you need as little back-pressure as possible in order for the turbocharger to work at its maximum efficiency. This means you ideally want an exhaust system that is the largest diameter possible - without being excessively loud. This is why vehicles with the large 3.5" exhaust systems are producing big bhp/torque figures on standard turbocghargers.

The decat pipe increase power/performance by removing the exhaust back-pressure caused by the standard catalytic converotor. An up-graded doen-pipe is a good idea, as it removes the internal restictions of the standard pipework. However, for maximum performance you will always get better results from a complete turbo back 3" system - as the complete pipe diameter is larger (as the decat/downpipe systems have to match up with the small original exhaust system flanges.

Less backpressure will produce higher boost pressures - up to a point. As the system begins to become rstrictive again at higher power levels you will end up generating more heat than horsepower. As the power levels go up it really comes down to the details.

Hope this helps,

Chris
WRC Technologies Ltd.
 
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