Okay, so I had a good night at the strip last night. Best time was a 14.67 at 97 mph. It's amazing how much faster the car is since I replaced the stock airbox and K&N drop-in with a K&N cone filter. I'm still not boosting over 8 psi, more like 7.5.



My friends tell me the car is blowing a good bit of oil smoke on every shift, so I'm guessing it's the turbo bearings. The car has just over 100k on it, so I'm sure its due for a rebuild.



How hard is it to put new bearings in the turbo? How much does it cost? I've already had it off once, to port the wastegate, so I know what I'm in for. It'll be a lot easier the second time around. I noticed a good bit of play in the turbo bearing, but the turbine wasn't scraping the housing, so I put it back together like it was. That was last fall.



I'm also interested in budget-minded alternatives to the stock turbo. I think I heard that the S5 turbo will bolt right on the S4. Is this correct? I'm guessing I'd need the S5 manifold also.



Thanks for the help!



https://www.nopistons.com/forums/pub...IR#>/bigok.gif

S5 turbo and manifold is a common upgrade, you can rebuild the turbo for about $150 yourself... I don't know whats involved, I'll let you know soon..

I was asking about this a while back. I was going to rebuild it myself but you have to balance the shaft. That is not possible without the proper equipment.



Another upgrade is the T04 compressor put on the stock turbine.

Thanks. Anybody else have anything to share regarding a DIY turbo rebuild?

you can buy the parts but you need to get em balanced other wise its gonna grenade

I have an S4 turbo in great shape thats had the wastegate ported and knifeedged. PM me if you are interested in it. I decided to go big.

would that require larger injectors .... therefore an EMS?

would that require larger injectors .... therefore an EMS? [/quote]

Yes larger injectors would be needed, unless you were running low psi. Stock fuel system can only support 10-11psi on the stock turbo.... Many ppl have gotta away with just a piggyback on a compressor upgrade.

**** piggyback - haltech https://www.nopistons.com/forums/pub...#>/biggrin.png

i was running a hybrid on the stock injectors @11-13psi and i had enough fuel to make it stumble. stock ecu too



mike