Guys see if you have any input on this one.I have a 87 turbo supra in my shop for repairs for some oil leaks. I noticed when I took the car for a ride that it did not boost at all.Vacumm boost guage is not working properly but you can definatley feel and hear that it is not spooling at all. I checked all the hoses and vacumm lines,acuator,wastegate,etc. Has a cracked section on the intake rubber hose but that wouldnt do it. After looking in the inlet bell I noticed that the impellers on outer fins were chewed up on most of the outer tips.I told customer it might be turbo and pulled it out but I am not convinced.Shaft has excessive play.I,ve seen worse and it still boosts? I will bring turbo to get it looked at by turbo guy in my area but something just doesnt seem right.Car runs fine like a non aspirated car, no spool.If you know anything please let me know ,Thanks...
turbo is busted..Why wouldn't you suspect that after seeing chewed-up fins? Consider how fast a turbo spins, and throw chewed-up blades into the mix. Any visual damage to a turbo means replacement/rebuild. "Excessive endplay" - if it's excessive..this is a no-brainer. Bad turbo.
My question is this. I have seen turbos go bad and the maike noise but you still get maybe 4-5 pounds out of them.Dont get me wrong I think this turbo is no good also but this is the first time Ive seen a couple of chewwed up fins and a loose shaft with absolutley no boost whatsoever? No blue smoke,no noises,just no boost. I guess what Im tryin to say is the customer was told turbo was bad upon my findings and I just hope that it is that because if it is not then I will have to explain the misdiagnosis.Just tryin to be 100% positive it is the unit.
Also could the tips of the blades being chipped up cause a total lack of boost??Also turbine side blades looked fine and shaft spins with ease.The only thing visably wrong would be 4 out of 5 blades have chipped off pieces at the ends and a 1/8 play in the shaft.
the supras are famous for vacuum leaks causing a zero boost problem, their computers sense a vacuum leak and kill all boost. a chewed up turbo will still give you some boost.
Exactly how would it kill it.I could understand if there is a vacumm leak then the wastegate wouldnt work properly, and car would not bleed off and actually overboost? Sent the turbo out will get it back tomorrow. Like I said I looked pretty much everywhere and the only thing that was pretty bad shape was the inlet pipe to turbo from mass air. There definatley was a vacumm leak in this area.Also looking down the down pipe at first catylitic converter and it looks to be obstructed somewhat by crud. Ordered a aftermarket downpipe with new high flow cat to be sure.I will install all of this by Friday I let you know, thanks for the input.
I think he means the computer senses a vacuum leak and then sets the wastegate to open somehow, so no boost can build up. Have you tried any Supra websites?
Yeah that I can understand but had car on the lift and had a buddy in the car running in gear at idle wheels spinning slowly. The wastagate on these cars are under turbo so you gotta get a long prybar and stick it up between the downpipe and chassis. I had my buddy hit the gas while I moved the wastegate by the arm in each direction and still no difference. So you can see the measures I went thru just to get a little wistle out of it. The supra web sites just wanted to talk mods and how cool there cars are. I'm tellin you workin on one of these cars makes me appreciate my TR a whole lot more than I did before.Lets see what happens. Thanks
Got a friend that's a mechanic for BMW dealership. He's into rice, like the supras. We put the frankenstein turbo off my syclone on his supra and he had the no boost problem once, with his computer killing boost because of a vacuum leak, that's why I was aware of the problem.
Contact him (Evan) at longshanks9@yahoo.com if you want to, will send him a copy of this post so he'll know what's up, may save you a lot of time, BTW he has the same opinion of the ricer sites as you and I do.
Alright car is back together and it is now boosting around 6 psi, should be a little more but car must have a dirty fuel filter or something because it is not to quick to get up on the rpms. Hey at least we got an improvement I guess the turbo was part of the problem and we didnt waste our time , thanks guys.