MyE28.com

Just wanted to ask a quick question....and the people on this board seem really knowledgeable about turbos and def. have some experience..........
Are there any major drivetrain modifications necessary when installing a turbo system into an e28?

You'll need an automatic tire dispenser

At lower boost levels the stock equipment is fine. For high boost applications a better clutch is about all you'll need.

You will want to make sure all the OEM parts are in the best possible condition though. Depending on how you drive, you might break old diff mounts and that sorta thing.

I was running about 6psi on the stock clutch for a very long time. I bumped it up to 10psi after about 10 months of 6psi -- it took about 2 weeks and I needed a new clutch. Now I'm running a spec s3 clutch and m5 pressure plate w/ no problems.

Personally, I would strongly recomend a urethane filled diff mount. If the rubber there is even close to marginal, the inner piece can pull away from the outer piece when subjected 60% more torque than stock. It looks like this:



If that should happen, your differential will smack the pavement with an obscene amount of force, likely resulting in this to happen to your diff cover:



The drain plug was never found, thanks for asking. Aside from that, all the above applies. These cars can actually take quite a bit of abuse on the stock equipment.

Jeremy


[Edit by Jeremy on [TIME]1140483274[/TIME]]

I wouldn't bother looking fo rthe drain plug, Jeremy... looks like it drains just fine.

[QUOTE="Jeremy"]Personally, I would strongly recomend a urethane filled diff mount. If the rubber there is even close to marginal, the inner piece can pull away from the outer piece when subjected 60% more torque than stock. It looks like this:

If that should happen, your differential will smack the pavement with an obscene amount of force, likely resulting in this to happen to your diff cover:

The drain plug was never found, thanks for asking. Aside from that, all the above applies. These cars can actually take quite a bit of abuse on the stock equipment.

Jeremy

[Edit by Jeremy on [TIME]1140483274[/TIME]][/QUOTE]

Umm, I thought the mount was configured to not break away if the rubber failed? Right, I guess I need to see one up close again.

You may want to upgrade to poly subframe bushings also, they can take a real beating in turbo car also.

RussC

Umm, I thought the mount was configured to not break away if the rubber failed?

They are, Russ. Under normal naturally aspirated kinds of abuse, anyway. The angle can be see on the failed part, and rubber does compress a good bit. Mine didn't even "clunk" in reverse. Apparently 300ft-lbs of rear wheel torque is enough to pull the rubber center right through in second gear. ~0

Jeremy

I see, I thought that was correct.

RussC

You'll need an automatic tire dispenser

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