BoostGuy951

Any idea what might be causing this?
It is the stock k26/6. It doesn't smoke any other time except on boost.

special tool

19 psi

Mike Buck

</font><blockquote><font size="1" face="Verdana,Tahoma,Arial,Helvetica,Geneva">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">Originally posted by special tool:
<strong>19 psi</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">ding ding we have a winner

<img border="0" alt="[cheers]" title="" src="graemlins/beerchug.gif" />

BoostGuy951

Maybe you could offer some real advice as to what is going on here. The car has been running 19 PSI with no problems for about 4 months.

Mike Buck-
I fail to see how that could one day result in a smoking turbo. Maybe you could enlighten me with a delve into your apparent well of Porsche knowledge, instead of embarrassing yourself with your lacking wit.

nine-44

Maybe you are massively over spooling your turbo and it's finally taking it's toll.

Danno

Hmmm, smoking on boost could be the turbo seals wearing out. Could also be blowby as well... Anyone have a definitive test to determine which?

I was thinking perhaps removing the crankcase breather from the J-pipe and putting in a catch-can. Then measure how much oil gets dumped.

special tool

19 psi is a very hard working little 26/6. we know that it probably had some use before you made it work harder and that you have a shimmed wastegate. So now even if you have some boost fall off at the high end, it will probably be the turbo running out of steam - all the time at wot.
Sounds like an opportunity for a Garret to me.

BoostGuy951

Thanks alot Danno and Special Tool for the informed responses. I guess its time I got that SFR Stage 3. Danno, as far as the crank breather, I can do that whenever I eliminate the Stock J-Pipe with your Link Standalone.

DangerIsland

No need to get nasty towards Mike, Mr. BoostGuy.

I'm a newbie to the turbo game, and I could tell right away what they were both getting at. 19psi is overworking the turbo, thereby likely causing a problem.

And not to steretype you or anything (I could be way off), but posting your 0-60 and 1/4 mile times is a good indication of how you drive the car, and lots of people on rennlist see it as a telltale sign of someone driving their car for the wrong reasons, and/or breaking it easily pulling dumb stunts. That's just my experience based on the way people react to each other here on the boards. And like I said, maybe I've read you wrong, but that's the impression other people are likely to have.

Someone from rennlist I was talking to about problems with turbos (after I told him I was worried about reliability on mine) said "the #1 reason people blow up their cars is turning up the boost without taking the neccisary steps to handle fuel delivery and the other things you need to take care of."

Mike Buck

Sorry for the poor humor. These cars are headaches for us all. Don't let the joking get to you. Give us some more info on your car.

Are your APE chips burned for 19psi?
What kind of BOV are you using?
How many miles on car/turbo?
Why are you using a MBC, LBE, and a shimmmed WG at the same time?

fast951

Why do you think it's the turbo is causing the smoke? Are you getting excessive amount of oil in your intercooler & pipes? Is your crankcase pressure so high that oil is not draining from the turbo? Is the crankcase ventilation hose connected correctly (in front of the turbo)?
Are you getting oil in the turbo inlet?
Have you done a leakdown test to check your rings?
A good leakdown does not rule out bad oil scraper rings...
Try to figure out the real problem and what caused it before spending $$$$ on a new turbo.

Good Luck.

BoostGuy951

Danger Island-
I would like to know exactly how these cars are driven for the "Wrong Reasons". I Take great care of my car. I just completed the rod bearing replacement myself. It was my first time getting that deep into an engine, which probly explains why it took me 40 hours to complete the whole service. The point is, I care for my car, I do not treat it badly. What I do, however, is drive it. I take it to Drivers' Ed, Autocrosses, and yes, at times I Drag race it. If this is "Driving my car for the wrong reasons" then so be it.

I guess I don't know that it is indeed the turbo, I guess that is what I anticipated would go wrong with me running 19 PSI. I thought that the danger was running lean and blowing the head gasket. It doesnt seem like that happened, so it would seem that the turbo is a likely candidate for failure.

A little info about the car:
-As far as I know the turbo is the original unit that was on the car at the time of purchase.
-The car has 107k miles
-My chips aren't burned for 19 PSI, I'll admit that I was probly asking for it running that high.
-I had shimmed the holy hell out of the Wastegate, so I installed the MBC to tone it down instead of trying to get the # of washers right to get the right boost I wanted. As far as the LBE, that is more concerned with spool up.

Fast951-
I don't know if I am getting excessive oil in the pipes, I can check on that tomorrow.
As far as the crank pressure, when I refilled the oil I filled it with 8 quarts, Just a little over what the literature says is recommended. I wanted to err on the side of caution as far as supplying the oil pickup with enough oil.(I autocross occasionally)
The crank ventilation hose is hooked up where it is supposed to be. I have not done a leakdown test, but before this incident the performance was extraordinary.

adrial

Autothority chips are OK at 19psi, they knew there'd be people like you cranking the boost way up.

I say clean out all the piping and see if it still smokes..

Odly enough my car was smoking blue on boost (oil), then I cleaned the pipes (not to cure the problem, I think I did it cause I had the intake manifold off anyway)....and presto...no smoking since...its been a few thousand miles...

Simple, yes, can I explain why the oil would be there in the first place but not come back? no

But hey, worth a shot...

jimbo1111

I had 3 differant turbos in my car and can say they all smoked. 2 smoked when on boost and on shifts and the brand new t04b #8 bb i run now smokes at idle for 20 sec. after a hard run. from my experience all i can say is most of the after market turbos new or rebuilt smoke a little.

OZ951

</font><blockquote><font size="1" face="Verdana,Tahoma,Arial,Helvetica,Geneva">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">Originally posted by Mike Buck:Why are you using a MBC, LBE, and a shimmmed WG at the same time?[/QB]</font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">Running a LBE and shimmed wastegate along with a MBC is not a problem. They all work together doing their bit. MBC sets the boost limit, LBE allows boost to build quickly and shimmed wastegate enables the wastegate to hold a higher level of boost.

I agree that running a K26 at 19PSI is pushing it too hard though, it wasn't designed for that amount of boost and consequently it is not efficient at that level of boost.