de cat questions

[extra330]

2007 ls2 auto. varex catback system. not been mapped
just had mot today, passed. talked to tester and said if i decatted it he would be sympathetic.
couple of questions.

what bhp gains from a decat
what do you do with the pre cat and post cat sensors to stop the ecu throwing an error up.
cheers

[SturdyHSV]

extra330 said:

2007 ls2 auto. varex catback system. not been mapped
just had mot today, passed. talked to tester and said if i decatted it he would be sympathetic.
couple of questions.

what bhp gains from a decat
what do you do with the pre cat and post cat sensors to stop the ecu throwing an error up.
cheers

Without an associated map, probably not a great deal on the power front, but it will smell fantastic and probably pop and bang more

You'll probably need to have the rear sensors shut off in the tune to stop the check engine warning (probably won't illuminate a light, just the warning on the dash as it's emissions related)

[fastbikes76]

http://www.pistonheads.com/gassing/topic.asp?h=0&a...



I found I now get a fantastic bang on WOT upshifts...First time I followed the wife driving the R8 after the decat when she changed up from 2nd to 3rd the bang made me spill my drink

[extra330]

i have the post cat extensions on already, this cured the error when i first put the cat back on.
would you think its just a simple ..extend the pre cat sensors and no errors?
also where do you lads get your decat pipes from
thanks again

[SturdyHSV]

extra330 said:

also where do you lads get your decat pipes from
thanks again

After a couple of years of pops and bangs, my car has helpfully de-catted itself

[j666eds]

fastbikes76 said:

http://www.pistonheads.com/gassing/topic.asp?h=0&a...



I found I now get a fantastic bang on WOT upshifts...First time I followed the wife driving the R8 after the decat when she changed up from 2nd to 3rd the bang made me spill my drink

I have a set of those extenders sat on my desk. Just waiting for my headers to turn up tomorrow. Hope i get the same results as you got with the no eml light on

[fastbikes76]

I never touched the Pre cat one's. All I did was gut a spare set of CATs, this means it still looks like the cats are fitted if I get an arsy tester but hopefully will still pass Emissions.

[Granby]

SturdyHSV said:

extra330 said:

also where do you lads get your decat pipes from
thanks again

After a couple of years of pops and bangs, my car has helpfully de-catted itself

Thats what im working on

[Behold81]

j666eds said:

I have a set of those extenders sat on my desk. Just waiting for my headers to turn up tomorrow. Hope i get the same results as you got with the no eml light on

I never needed my extenders.

[KMud]

fastbikes76 said:

I never touched the Pre cat one's. All I did was gut a spare set of CATs, this means it still looks like the cats are fitted if I get an arsy tester but hopefully will still pass Emissions.

Don't think it will pass a legit emissions test somehow!

Decat is the best sound