Knackered compressor wheel?
Turbo Mini Forums

Pulled the intake bend of the GT17 I got from a scrapper the other day and was confronted with this. The pics say it all but I'm not thinking this is going to be that servicable looking at the compressor. There is no play in the turbine shaft. What do you guys think?

What makes me wonder is what could damage it, It had all the intake pipework on. Could it have been run without an airfilter at some time?

Edited by minimole23 on 23rd Nov, 2009.

How much are they asking for it?

In the 13's at last!.. Just

I bought it in the summer!

Thats not damaged!

This is damaged!



Oh and I am looking for a decent turbine and shaft

That's fine - I've run a lot worse. Sure, it isn't going to win you 1st place at Avon, but it'll work just finem and is a lot better than an LCB with no turbo.

I have seen so many GT17 with compressor damage and I can't understand what is happening. Can anybody explain it. I guess it only needs a small bit of debris in the intake so I can only assume there is a part of a Saab that comes loose quite often.

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They go into surge even in the standard application, noticed it in my bosses Saab, also breather system dumps water and crud in pre-turbo, couple that with hammering onto a motorway sliproad from cold and you have damage :) just a theory anyways, see it alot on modern turbo motors cause the turbo's are always small and worked very hard.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

how exactly do you detect surge?

sorry for the hijack!

Mr. Prawn, the friendly Crustacean- slowly making steps towards forced induction.

um it sone of those things you need to be in a car and feel, but it sounds like "shoom shoom shoom shoom" as you hear air rush into the turbo and then stall then rush in etc and naturally if you watch the manifold pressure it goes nuts. Really bad for the turbo.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

I posted a link some where, Oh teas up, I'll find it in a bit

edit: found it http://www.youtube.com/watch?v=nCj6Spwl1CU&feature=fvst

Edited by Sprocket on 24th Nov, 2009.

funnily enough i have only ever seen it really bad on gts-t's as in the video had 2 in my work that do it with mild turbo upgrades.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

we have our turbines surge occasionally if the bleed valves etc are stuck during start. fook me that makes some noise! Never can get to the E-Stop quick enough!!!

I would be more than happy using that turbo

Took the comp housing off at the weekend while I was having a break from welding and checked the turbo out a little bit more.

It does seem good, no play in the turbine shaft, and no evidence of contact with the housing. I decided to get the 1000 grit wet and dry paper out and just remove the high spots of the damage from the wheel.

It only got a little scrape so shouldn't effect balance, and it cleaned up rather nicely. If the 1380 doesn't keep me happy for a while it may go on an engine sooner then originally thought.

Bring on the 16 head if not!

did you remove it yourself
if so was it a hard job?

That looks good to me. :)

Ditch the 1380, and get the turbo up and running! :)

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1/4mile in 13.2sec @ 111 terminal on 15psi

To remove the housing, all you need to do is undo about 8 bolts (i think) that go round the circumfance of the housing. A 2 minute job. by loosening them you can also rotate the compressor outlet to a better angle

Matty, I would like nothing more then to turbo it. But I don't have a gearbox that can take the punishment. The 1380 engine will be up to more then just a couple of psi boost if I go down that route.

I wan't an engine that will rev to 8k though, hence going down the N/a route first, then 16v turbo route later on. I am starting to hoard parts though for it.