745 turbo specs n anyone?

[Jose]

Hi guys,

I was offered an M102 engine today in parts. Everything is complete , except for the electronics, but that's no issue as the loom and computer from the E30 325i can be used with a program adjustment.
I really don' t know much about this engine except it' s supposed to output 252 bhp with only 7-8psi.

Does anyone have experience with tuning these engines before, are they reliable and what about the 3K charger? I' ve heard of these before, but don' t know anything about build quality and reliabillity.

The engine is for my M3 E30 as I sold my nearly completed M3 turbo spec-engine to a costumer for way too much money, so I couldn' t refuse but it' s " heartless" now.

Thanks bimmernuts.

[niall]

i have always been interested in the 745i turbo aswell,
i havent had any personal experience with them because
i have always been put off by people telling me about their
poor reliability, i guess its a good place to start for a turbo
set-up, but i would personally just build a kit up, because
the KKK turbocharger they use does have reliability issues,
so you would really wwant a garret instead also the exhaust
manifold design is far from ideal.

[Jose]

Another compressor is not the issue, it´s just that the compression ratio is very interesting and I will save a lot on loose parts. Th M30 I was building for my own set up cost me over 3 grand in parts, and that´s without a compressor, intercoolre or other ****. I already have a tubular manifold of our own design, so that´sok too. I can buy the 745 package for a mere 400 US, so that´s why it is so very interesting.Thanks for your input though.

[niall]

sorry, my input wasnt very helpfull, i didnt realise you were so clued up on it,
i reckon for 400 bucks its a dam good buy, what specs are you after, i have some info.

[Interceptor]

Another compressor is not the issue, it´s just that the compression ratio is very interesting and I will save a lot on loose parts. Th M30 I was building for my own set up cost me over 3 grand in parts, and that´s without a compressor, intercoolre or other ****. I already have a tubular manifold of our own design, so that´sok too. I can buy the 745 package for a mere 400 US, so that´s why it is so very interesting.Thanks for your input though.

"The 745i's have been much maligned as maintenance nightmares, but aside from the high maintenance nature of any 7-series, the only additional maintenance is the turbo and it's affiliated systems. Parts are becoming scarcer all the time, but I have yet to experience a problem getting any needed parts."

Source: http://members.aol.com/turbo745i/

[JAlfredPrufrock]

It's going to make your M3 way too nose-heavy.

[Jon K]

It's going to make your M3 way too nose-heavy.

The difference is basically the 745 has different oil routes for the turbo etc. Its lower compression. I think M30 is 9.0 the M102 may be 8.5 or 8.7 not sure. With a boost controller and upgraded diverter valve you can make silly torque.

[Jose]

You understand my brainstorms Jon. It´ll be a complete wicked motor when fine tuned, I guess 300 bhp will be in clear sight. Compression seems to be 7,0:1 for a std 745.

[Jose]

As for the nose getting to be too heavy, it won' t. The engine will be positioned far more back than on the Alpina B6 E30 series . I' ve done the M30 into E30 build a few times and was pretty impressed how the car handeled itself with the extra weight. Just push back the engine as far as possible by pushing the firwall in by 5 cms and you' ll be in the clear. It won' t be as the factory intended it, but it' ll be much faster than the original M3.

[JAlfredPrufrock]

As for the nose getting to be too heavy, it won' t. The engine will be positioned far more back than on the Alpina B6 E30 series . I' ve done the M30 into E30 build a few times and was pretty impressed how the car handeled itself with the extra weight. Just push back the engine as far as possible by pushing the firwall in by 5 cms and you' ll be in the clear. It won' t be as the factory intended it, but it' ll be much faster than the original M3.

I look forward to seeing it then.