de-cat pipes

[ste]

anyways as some of you no my car has a ok spec and was mapped at 1.1bar and got 476.3bhp at the fly wheel but while gettin alignment done yesterday i noticed car was still runnin factory cat... i not mechanically minded at all and my mapper never told me i still had standard cat so by fittin a decat will it improve the car much???? and also will it rduce my turbo lag??? i am runnin apexi rx-6 top mount turbo and full boost is at bout 4700rpm so as ya can imagine the lag is very annoying

any help appreciated

[Greg]

The less retrictions the exhaust gasses have to pass through the better. The turbo should boost earlier, and harder with that gone. Well that's if there is a restrictor in the cat like there was on my Chaser.

[ste]

but even by lookin at pipes the cat pipe is so much smaller

[Greg]

Get one so. Expect a a noise increase too.

[ste]

ill be fuckin deaf lol

[colm]

are you still running a lamba?

The lack of restriction in the exhaust with a de-cat can help you get on boost that bit quicker and might mean your map isnt giving the fuel needed in the right places any more, so keep a slight re-map in mind when you go about doing it

[ste]

are you still running a lamba?

The lack of restriction in the exhaust with a de-cat can help you get on boost that bit quicker and might mean your map isnt giving the fuel needed in the right places any more, so keep a slight re-map in mind when you go about doing it

no buddy lambda is not fitted wat difference will that make

[colm]

the lamba monitors the afr's constintanly so it can tweek your map if your running a little rich or lean.

Without it its running the way it was tuned with your current set up so might get a bit lean as your coming on boost with a de-cat

[ste]

the lamba monitors the afr's constintanly so it can tweek your map if your running a little rich or lean.

Without it its running the way it was tuned with your current set up so might get a bit lean as your coming on boost with a de-cat

ya serious ye?? fuck id hardly have to pay for full remap again would i

didnt realise it'd make that much of difference... would i be able to tell myself by drivin it its runnin lean as my mapper is over 2hrs away

[colm]

It shouldnt be a full remap, the bottom and top end of the map wont have changed but maybe the 1500rpm just as you come on boost might need altering a little. Its grand changing them on cars that havent had a remap and that are still running lambda's cos its able to give a little extra juice where its needed

Handiest way to tell is if you can borrow a wide band lambda sensor for a day and just keep an eye on your afrs before and after the de-cat. Then youl know for sure

running lean isnt someting you wanna mess with, especially when your running your sort of power. youve got lots of juice flowing.