Jump to content
SAU Community

Recommended Posts

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
Link to comment
https://www.sau.com.au/forums/topic/176910-black-smoke-on-boost/
Share on other sites

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!

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Kinda glad I never got to this ..    https://www.facebook.com/groups/1483859159195077
    • @GTSBoy This method was able to get readings of -10 to -2, so it looks like its monitoring.  Now I need to figure out why the vacuum on the line provided isn't alternating with manifold pressure.  I went with 2 lines that an RB25 tuner recommended but I'll get a longer hose and try directly off the back of the manifold.  He may have been used to OEM intake setups while I have a DBW setup that removed the MAF and IACV.  
    • I work at a car detailing and tinting shop called Quark which gets all manner of German cars in usually (mainly due to a contract with Mercedes Benz Kita Osaka, BMW Nishinomiya and others) but every once in a while something special comes in, like a fully restored 1972 HS30 Nissan Fairlady 240ZG... The shop owner had immediately started applying film to the windows as soon as it was in the shop so the interior was completely covered in towels and plastic sheets. But I could get a few photos of the engine bay which was restored like new. Such an amazing car to see in pristine condition in Japan these days.  
    • Was going to say the car pulls up nicely everywhere, especially going into that last long right hander before the main straight. Looks like a lot of fun.
    • Hey Dave, welcome aboard! Good to see another soon-to-be Stagea owner here. The wagons are awesome — plenty of space, still got that Skyline DNA, and loads of potential if you’re into mods. Definitely post up pics when you get it, everyone here loves seeing new builds. What model/year are you looking at?
×
×
  • Create New...