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

    • Working through possible solutions of converting my mechanical speedo.    Anyone know what type of speedo sensor the factory r34 gtr getrag has ? what the output is ? I assume its not a VSS and more a voltage like earlier speedo sensors ? Can an ECU read it ?  
    • roof rail delete used to be a thing, they were made locally for a while too
    • I can get more photos of it here soon and I plan to make a thread detailing the process. I received the car this way and it sorely needs refinishing. That is probably the most appealing photo of it. Up close it is fading, cracked, and needs to be re-glued. Depending on their condition I'm on the fence between refinishing or making a new set.  Another angle hiding the pimples and razor pumps  
    • According to this thread the RS4V with build plate RC40 comes with the R200 diff @ 4.083 ratio as well (mine has said RC40 denotation). We may need to check if the axle stubs are the same pattern as well. The auto subframes have longer axles. However I think yours being a later Series 2 as well, we should have the same bolt pattern for the diff stubs. Unless your upgraded rear also has upgraded axles. Either way, I would not be opposed to pulling the covers to check so I can inspect that  fancy rear core  Also I don't have HICAS. I don't believe that should change things but I hope the people here with heaps more experience than me can correct me if I'm wrong   Let me know if you want to attempt to make this work and I can get some pictures of mine from under the car. 
    • It's not that straightforward. For example I have had this code because my ignitor/power transistor wires were unplugged. It knows something is wrong but has no idea what it means. If you want to actually diagnose this I recommend following the service manual flowchart for code 21. Ohm out the harness, coilpacks, inspect the ECU, etc. And again, it's entirely possible for there to be no problem at all but if you're running a different coilpack it'll trigger the code because it doesn't like what it sees.
×
×
  • Create New...