Prescion Turbo

[KevinB]

^what otto said. A lot of the import guys use restrictors. But being that he never needed one in the past and its the same setup is kinda wierd.

Also, after my most current turbo failure, it took a long time to get all the oil out of the exhaust. When the car was first started up it was definitely in bug killing mode. After about 3 runs done the track and 20 street miles, its all back to normal. I knoe eric does have that shorty exhaust system....you would think that it would take less time for it to all burn off.


Btw, did you guys figure out where the oil leak is from? He told me about that before he left but like him, I was moving too and could not get over there.

 

[Cheeseburger]

Return line is too small i.m.o. especially if you have it returning oil to the stock location.
Put a stock oil return tube back on and try it again to see if that solves the problem.

 

[V6RACER]

-8 isn't big enough and you need a restrictor in the turbo feed most likely.

Start the car without the turbo and see if it is smoking to rule that out.

 

[Mike Licht]

The minimum recommended return size is -10, bigger is better. I have seen this happen many times with braided returns that everyone thought were fine. That is prompted my question on what return is on the car. This is why I really try to use a stock return whenever possible. I would be willing to bet that is the problem.
Mike

 

[scot w.]

Wait a second before ruling on a small return line! He was running this set up for 8 YEARS with the original (same size) Turbo without a single problem!! He Never went up in turbo size and he Never went to a different center section just simply rebuilt the T64E.. then he sent that turbo off for a rebuild after the original turbo and same set up worked flawless for 8 years and now this problem has been with every rebuilt turbo since!!!. Eric said he will check to see for sure if it's a -8 or -10 he's not sure.

Here's a list of what PTE said was wrong with the returned turbos:

1st turbo (original turbo) rebuild = (the one that worked for 8 years) = PTE said the heat shield was rotted and heat got to the seals. This turbo the Bearings went out of it after only 600 miles (only went to BG and back).
2 nd turbo rebuild = Went bad only after 200 miles and after sent back PTE never told him what was wrong with it.
3 rd Turbo rebuild = Has had 0 miles on it and smoking as bad as the other three did.

What I notice is the decline in miles after every rebuild.

Otto, You might be onto something and I will check into the restricting theroy. PTE sends back the turbo with the oil feed fitting already in place to fit there oil system set up. and it's a mystery as to why this set up (un changed) has worked for 8 years prior and just after the first rebuild all these problems arise. Plus you would think a company as large as PTE would know if or what size restrictor there turbos need especially with running there Oiling system!

SW.

 

[Mike Licht]

Scot, I completly understand what you are saying about the return line and it being on the car but those lines delaminate on the inside over time with that hot oil going through them. Maybe bending it after it was run all that time damaged the liner? It is worth a look, I have seen it happen too many times. The chances of getting that many bad turbos in a row is pretty small, not impossible, but not likely either. Hope you figure it out without too much frustration.
Mike

 

[scot w.]

Scot, I completly understand what you are saying about the return line and it being on the car but those lines delaminate on the inside over time with that hot oil going through them. Maybe bending it after it was run all that time damaged the liner? It is worth a look, I have seen it happen too many times. The chances of getting that many bad turbos in a row is pretty small, not impossible, but not likely either. Hope you figure it out without too much frustration.
Mike

Mike I agree and I will look at the line for sure as I have several stock return lines laying here.

We will be pulling the car into the garage next week and I will post the findings, Stay tuned!

Scot W.

 

[Otto J]

That was what i was getting at with a braided return,especially after 8 years and then it was disturbed.Get a stock one back on there and try it

 

[bison]

It's a -8 Braided return line and it's NOT KINKED or CLOGGED!!

I wish i could place bets. Id bet the oil return line is the problem like i mentioned in post #6. Try a stock return line that makes a fairly straight shot to the block. Ive removed at least 3 problematic return lines and cured smoking problems on these car over the years. Do as Otto said and try a different known good turbo or return line. Or take the turbo that you think is bad and try it on another car. If you see oil behind the turbine its usually a drain back problem. Id say its almost always a drain back problem if the turbo has no shaft play and it is new and smokes. Ive seen old turbos that had a lot of carbonized oil in the center sections but they were off of cars that had a lot of hard miles on them.

 

[Bent6]

Most smoking turbo issues are usually either bad seals (which I doubt it has being freshly rebuilt) or too much oil feed and/or lack of return capacity. I rebuilt the oil pump on my race engine and it started overpowering the turbo with oil at idle. Solution was a smaller feed line. I've also seen NOS jets used as inlet restrictors. I have to agree with the above posts to replace both the feed and return lines and see what you get.

 

[mygn276]

I went thru this same thing with my turbo. Useing a - 8 is not big enough line to handle the flow of oil going thru the turbo when the oil is up to temp. I went to - 10 and also put a .060 dia restrictor in my presure side and never looked back.

 

[TURBOELKY]

I used a smaller than stock return line (-6) and learned a lesson....a hard lesson. It popped the oil seal, and spewed A LOT of oil down the pipe into the exhaust. I would go with the return line/needing reduction of pressure theory.....my .02$

 

[protracracing]

I agree it is your oil return line.But you may want to look at the oil suppy line my be to big.If he has an older PTE turbo saver they had a -6 supply line.
And there newer kits come with -4 line.

Hope this helps
Dennis

 

[MidGaGN]

Time for a borg warner unit??? lol


I have a T64E and initially it had a oil blowback problem. I was using a -8 drain... I stepped it up to a larger -10 hose and all of the problems went away...


Mine does spool as slow as Christmas 2-3 seconds to get to 20lbs. What stall is your customer using?

 

[Kip]

Any updates?

Thanks, Kip

 

[scot w.]

Update!

Okay I looked at everything people suggested and found Nothing Wrong!!

Otto mentioned the braided return line might be deteriorated: I Removed the line, Looked inside very closely and it was not deteriorated or stoped up or badly kinked enough to stop the flow of the oil.

The braided oil return line is NOT small like was mentioned!! The ID is 5/8'' (not really sure of the AN # that would be) but either way still not a restriction.

So I put a stock return line on just in case and started the car up and after a short period of time idling Eric took it around the block and came back and while idling it started to plume smoke out like crazy (BADLY)!! I then took the downpipe off and the turbo exhaust side had oil just running out of it and the downpipe is Caked with oil too.

All this turbo has on it was milage around the block!! .......

Not sure what Eric plans on doing at this point...


Scot W.

 

[Bent6]

Scot - the problem is more than likely that the turbo is receiving too high a volume of oil and it's overrunning the seals, getting into the exhaust and causing the smoke. SOMETHING has changed somewhere and caused the oil feed volume to increase. If you can, put an oil pressure gauge inline with the turbo feed and see what you have. If memory serves me correctly, the PTE turbo saver setup uses a -06 feed line to the turbo. Try changing it to a -04 line to slow down the volume of oil going to the turbo. I had the same issue with the turbo on my green car last year. The turbo was freshly rebuilt by PTE as well as the external oil pump. When we first fired the new engine, oil would accumulate in the turbine housing and later smoke in the DP. I can't say whether the rebuild of the turbo somehow caused this or the oil pump being fresh but the solution was to step down the line size feeding the turbo to a -04.

 

[scot w.]

Thanks for your input Will but I think we might have it fixed.. First of all the PCV valve was sticking real bad and pressurizing the crankcase so bad that it was spitting oil out the dipstick only at idle, when under throttle it would spray oil all over his engine bay! . We replaced it with a new one and also got rid of the one way valve he had in line and he just took the car out for a spin and went for a 15 min ride, came back and the turbo wasn't smoking and there was no oil by the dipstick. Fingers crossed I hope we got it!

He's on another test ride now, I'm standing by the phone!!

Scot W.

 

[xcessiv6]

The turbo is leaking around the center section near the exhaust housing a little. Got into 15lbs of boost with it felt ok. Hopefully this solves the problem, but still checking things out.

 

[KevinB]

Scot, for future refrence, to find out the AN size, each 1/16th of an inch is 1 AN. So, 5/8ths equals 10/16ths so 5/8ths is -10 AN.