Smoking Gtr

[R32 Zilla]

I have an R32 GTR with R34 N1s, rebuilt motor (few years ago now), PFC ect ect. It has recently been tunned at CRD and made 282 AWKW at about 18. It was also comp tested by CRD and they said it was fine, not perfect but fine.

Anyway, about 3 months before it was tunned I made a stupid mistake and overfilled the oil after checking it on slightly uneven ground. I drove it for a few weeks before checking it again and realising my mistake and I drained some out.

Now Iam not 100% sure but I think it was about this time that it started to blow some smoke on boost.

I think it is best if I now just list all the symptoms and things I already know and maybe someone can point me in the right direction.

- It blows a greyish coloured smoke and sometimes a fair bit of it.

- It does not blow smoke at idle

- As soon as boost starts to build the smoke starts and continues right through the rev range.

- After a good high revving run it smokes on over run about 5 or 10 seconds after you back off.

- It does not use a lot of oil

- It does not use any coolant

- It goes hard and Jim was happy with the tune. He was going to run more boost but we had some boost control issues which have since been fixed.

- i have installed a catch can since the tune but that has made no difference to the smoke. Catch can is vent to atmo type and PVC valve is still plumbed up not blocked off.

* The car is a daily driver and it is only a short drive to work. A few weeks ago I drove to Newcastle (from Bathurst) and it got a few good rev outs and I found that the smoke almost completely went away! I got back here and started driving it around town again and after 4 days the smoke was back.

I know to expect some black smoke as thats how Jim tunned it and he told me I would get a bit but this is a light grey colour and too much of it. Jim did comment on the amount of smoke on the dyno but he wasnt sure what it was.

Sorry ... long post.

Anyone ??

[R32 Zilla]

Is it time for new turbos? or if it was the turbos would they be blowing continuous smoke even off boost?

Thanks

Tim.

[Styline GTR]

Maybe its running a little rich???

[TezGT-R]

Maybe its running a little rich???

That would be black smoke, not grey...

[Styline GTR]

That would be black smoke, not grey...

Its easy to determine white smoke! But greyish blue and black can be a little hard!!!

[R32 Zilla]

Yeah I dont think it is running too rich. It blew smoke before the dyno tune at CRD and then I think even more after the tune. I would expect some black sooty smoke higher in the rev range but this obviously a much lighter grey (almost white) mixing with the black. On overrun the smoke seems to be almost white.

Tim.

[godzl1975]

Its easy to determine white smoke! But greyish blue and black can be a little hard!!!

what would white be? leak in inlet or ehxaust?

[Strik3r]

valve stem seals maybe ?

[R32 Zilla]

valve stem seals maybe ?

I have heard that if it was valve stem seals it would blow smoke off boost as well as on and when free revving.

Is this correct ?

[R32 Zilla]

Can anyone else help with this ?

[Bumblebee]

greyish smoke is rich. slightly rich.. not massively rich but rich non the less... stem seals can blow white or blue smoke, and only on idle or off the line. if it was ur rings, it would be blue.

over filling doesnt do anything aslong as its not seriously been overfilled.. most GTR track cars are overfilled because of the high g's during cornering and shitty baffle design.

id get my afr's chekced first. dont its not something u should be worried about a lil rich isnt a bad thing..

[GTScotT]

if its using oil, even though u say not much, how much is not much?

[aphid]

is it possible to get somebody outside the car while you do a run past to see what the smoke smells like, atleast this will tell you if it's oil or running rich.. if it's running rich then it's in the tune, if it's oil then perhaps there is still too much oil in the sump and it's creating excess pressure which is causing oil to leak out past the turbo seals.. just a thought

[R32 Zilla]

greyish smoke is rich. slightly rich.. not massively rich but rich non the less... stem seals can blow white or blue smoke, and only on idle or off the line. if it was ur rings, it would be blue.

over filling doesnt do anything aslong as its not seriously been overfilled.. most GTR track cars are overfilled because of the high g's during cornering and shitty baffle design.

id get my afr's chekced first. dont its not something u should be worried about a lil rich isnt a bad thing..

AFR's should be good as it has just been tuned and by a very good tuner.

The smoke starts as a very light grey (almost white) and becomes a darker grey as you rev it out. I still believe there is something causing the whitish smoke on boost but low in the rev range. I think the whitish smoke is simply mixing with rich black smoke higher in the rev range to make the darker grey. if that makes sense.

thanks

Tim.

[Bumblebee]

sounds like lil rich.. and if it is a lil rich then it is possible that he is a good tuner.. its always better to run a car a lil richer. helps stop detonation

it really doesnt sound like its oil to me

[R32 Zilla]

sounds like lil rich.. and if it is a lil rich then it is possible that he is a good tuner.. its always better to run a car a lil richer. helps stop detonation

it really doesnt sound like its oil to me

what about the white .. ish smoke on over run after a hard run ?

[Bumblebee]

that sounds slight oil... ive had that before on drift cars.. after going out for a real hard drive, they start to smoke like as if the turbos blown, but it was just the excessive oil vapours gettin sucked into the inlet via the pvc and getting burnt in the motor then out the exhaust.. they went away after lettin the car cool down.

does urs do that as well?

[R32 Zilla]

Say i rev to 7000 in 2nd and then same in 3rd and then change to 4th and just coast along and slow down. Well about 5 seconds after I back off I get about 5 to 10 seconds of white smoke. sometimes get a good backfire and flame too which I know is nothing to worry about.

I have a new catch can setup which is vent to atmo but I currently have the pvc valve still attached to the rocker cover. Could I just block off the pvc valve? This would obviously stop any oily fumes getting into the inlet manifold.

Tim.

[RaZ_TuRbO]

!2:1 afrs on dyno can still produce rich smoke in real driving.

[Bumblebee]

thats because 12:1 is on the rich side