Turbo smoke?
Turbo smoke? Hey guys,
I have a Turbonetics T76 BB turbo that smokes at idle and WOT. Setup is in my Silverado and consists of a forged 370 with trick front mount, -3 feed line and -10 drain to front of the timing cover. I used this turbo for about 5k miles on my STS kit with no problems and it started smoking the day I changed to the front mount. I shipped it back to turbonetics and they said it had a bad seal and rebuilt it. I put it back on and it smoked just as bad as before. Luckily I have a MP70 for a backup turbo so I swapped it on with no other changes and it has not smoked at all in the last 10k miles. Weird that a $500 dollar turbo doesn't smoke but a $1,700 BB turbo does.
For pvc I have the intake blocked off and both valve covers ran into a catch can that is vented to atmosphere.
The only thing I can think of that would be different from the rear mount would be the scavenge pump but I don't want to have to go back to that unless I have to. Can I or should I use a restrictor on a BB turbo? Any Ideas?
I have a Turbonetics T76 BB turbo that smokes at idle and WOT. Setup is in my Silverado and consists of a forged 370 with trick front mount, -3 feed line and -10 drain to front of the timing cover. I used this turbo for about 5k miles on my STS kit with no problems and it started smoking the day I changed to the front mount. I shipped it back to turbonetics and they said it had a bad seal and rebuilt it. I put it back on and it smoked just as bad as before. Luckily I have a MP70 for a backup turbo so I swapped it on with no other changes and it has not smoked at all in the last 10k miles. Weird that a $500 dollar turbo doesn't smoke but a $1,700 BB turbo does.
For pvc I have the intake blocked off and both valve covers ran into a catch can that is vented to atmosphere.The only thing I can think of that would be different from the rear mount would be the scavenge pump but I don't want to have to go back to that unless I have to. Can I or should I use a restrictor on a BB turbo? Any Ideas?
Last edited by 2ktransam; Aug 8, 2011 at 02:12 AM.
Turbonetics factory installs a filter/flow regulator in the oil inlet of their turbos. Also, there BB turbos are only half BB. The compressor side has a BB and the turbine side is still a journal bearing.
I'm going to measure the oil pressure at the turbo and then try a .062 restrictor. The turbo has been sitting on a shelf for 8 months so if it kills a bearing I'll just stick the mp70 back on until I can afford a gts76.
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I checked the oil pressure today and it had 36psi at the turbo (hot idle) without the restrictor. With the restrictor it has 26psi (hot idle) at the turbo. I sat in traffic for over an hour today and no smoke with the restrictor.
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My main problem was a -10 90 degree turn out of the oil return. Needs to be straight shot down. I dunno if you have a 90 or it's straight or not. But i use no restricter on mine. I have over 45psi at idle going to it. It use to smoke like CRAZY but after having it come straight down. No issues.
