1994 Supra TT
Single Turbo conversion - AEM stand alone
111k miles
Stock longblock

So getting to the track, figured I'd pull a few times to make sure the car was running correctly. I was seeing 11.7-11.9 AFR and 1-2v of knock, EGTs liked to hover at 740-750c. All seemed ok to me at the time (afr was a little higher than I would like, but at 1 bar of boost it seemed fine). Car was pulling strong until the 2nd pull. When I let off the gas, I created a smoke screen bad enough you couldn't see out the back window.

It doesn't smoke a lot at idle, when you start to get into boost it goes away, it's mostly when you create a higher vac. by letting the engine decel.

Any suggestions? I've got a compression tester heading towards my work (might as well do something while I'm here), if that looks odd I'll toss it on my leakdown tester. I'm thinking it's just a turbo seal though, I just get nervous with this stuff.

Thanks.

Edit : Did a compression test, it all came within 6% of normal readings. Goina take the intake piping off and start swapping this thing out and drain the oil probably collecting in the intercooler.


Modified by KooK at 3:20 PM 6/21/2008

 

how big is the oil return line off the turbo? does it have any kinks in it?

 

Oil return is a -10an, probably larger than what it needs, a lot larger, but it does the job. It's also a straight shot to the oil pan so I'm positive there are no kinks, but thanks for the suggestion.

 

I'm not necessarily an expert on this or anything, but the only time I've ever seen a "smoke screen" was when a turbo took on some serious damage.

 

is there any shaft play in the turbo??

 

how much oil is in the charge piping?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SovXietday &raquo;</TD></TR><TR><TD CLASS="quote">I'm not necessarily an expert on this or anything, but the only time I've ever seen a "smoke screen" was when a turbo took on some serious damage.</TD></TR></TABLE>

that was gonna be my next guess, i used to have the same problem, rebuilt the block still smoked on decel, rebuilt the head still smoked on decel, replaced the turbo and bam! no more smoke. worse part is the turbo that was on there was brand new and i had only put about 2500 miles on it, turbonetics