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Hi all,

I have a problem with black soot on my rear bar. It has always had a bit on the back, car is white, but has gotten worse since buying the car 6000km ago. I wash it take it for a 20min drive and it is covered again.

I have had the AFR checked and they were supposedly spot on. The cat still seems to be working properly as it doesnt smell like raw fuel.

What else could be causing this? It seems to do it worst when I take 2nd gear to the redline, I can visibly see the smoke out the back.

Car is:

96 33GTS-t

FMIC

PFC

Split dump to 3 1/2 after cat

HKS Pod

Bleed valve at 12psi

Any suggestions would be appreciated, thanks.

Edited by smoothR33
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https://www.sau.com.au/forums/topic/176910-black-smoke-on-boost/
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Has to be the tune, or a leaking injector or two or a dodgy fuel pressure reg.

anyway your AFR must be way out to be seeing black smoke out the back of your car while moving. How do you know that the AFR as ok?

Edited by tacker
you may possibly have a gutted cat, i no that this is common when the insides of the cat are bashed out....could maybe just need a tune as others have said

+1

my mate has (we are pretty sure) a gutted cat or callapsed cat and his car is filthy on the rear. his afr's are 12.0:1

anyway your AFR must be way out to be seeing black smoke out the back of your car while moving. How do you know that the AFR as ok?
I've been behind a stock 32 GT-R and a modded 33 GT-R (PFC), and they both exude a lovely black cloud when "nailed".

Stop running to red-line in second, and you might at least reduce the problem!

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