Is 217k mileage too much for a turbo on an M50?

[Null]

I have a '94 325I with 217k miles, the car has never missed an oil change and has never been tracked or driven exremely hard, 95% are highway miles from the autobahn. Is this too many miles or do you think I will be alright?

Thanks for the advice

Null

[Scho]

Do a leakdown and compression test. For a low boosting vehicle, I think you will have no problem as long as these numbers come out fine. If you want excess of 8-9 psi, I would probably do a fresh build. The head gasket would probably be the first to go.

[josemg]

I am nearly to hit the 200's and I'm in the project of the turbo. I'm planning use 7-8 psi and already checked the compression recently and hitted 210 psi on all of the pistons. So I think it is a great compression to move easily (low boost) the turbo. One thing that I'll recommend is to check the timing and replace the timing chain (all of them) with the sprockets, because I have noticed a little low end torque and I think that it is the responsible for that loosen power.

[Null]

thanks for the advice guys! I appreciate it.

Null

[Turbomaniac]

sometimes build up will form on the pistons and will actually raise the compression slightly but it shouldn't affect what you want. If you use low boost it will work out.

[live2roll]

i hate to ask a question on my own in the middle of his thread but kind of the same subject so sorry Null. but i have 122k miles on my 94 325is, do you think i would be fine putting an s/c on my car?

[forrest]

i put a AA stage 1 turbo on my car at about 170k. ran about 7psi. blew the headgasket within 5k miles. now doing a 3.2 swap

[josemg]

I'm the process to install the turbo in the car with 182k miles in it. Did your car overheat before your blown head gasket?

Did you use intercooler? Any external fuel pressure regulator? What kind of turbo did you install it? Which is the diameter of the piping from the turbo to the intake? Did you install the hfm before or after the turbo?

Sorry for all of these questions, but all of the affect the operation of the conversion from NA to Turbocharged Engine.

Let me hear from you,...

[forrest]

no not before it blew.
the kit was an Active Autowerke stage 1. yes it had an IC. no fpr, AA uses sofware. mitsu 17c turbo with 2.5" piping. hfm was before the turbo.

[josemg]

Maybe was just coincidence. I think that the fuel pressure is a mandatory. There is no one software that increases the fuel pressure. The pressure will increase strangling the return line, which is obviously controlled with a vacuum line. The software will help you with the duty cycle of the injector, but if you open the injector (increase the duty cycle) too much, it will decrease the fuel supply at some point that the engine will stall and of course blow itself.