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Re: from what I have heard!! (archive)

[ Follow Ups ] [ E30 M3 Message Board ] [ Msg. Board FAQ ]

Posted by Quentin on May 17, 2001 at 06:58:02:

In Reply to: from what I have heard!! posted by Adam p on May 16, 2001 at 22:19:38:

Not to piss you off, but actually the E30's motronic management system has fuel mapping uploaded onto its main chip. When you buy an aftermarket chip, ala Jim C, there are different fuel map curves for various O2 sensor readings, throttle angles, etc... The motronic fuel injection is is pretty much 100% electronically controlled, except for the fuel pressure regulator. It would be sweet if someone made an electronically controlled fuel pressure regulator though.

You are correct that you have to run a special ecu mapping, as these cars love to run lean with forced induction, due to the ecu and the high compression ratio. By raising the amount of air in the cylinder, you are kinda doing the same thing as increasing the compression ratio (more air forced into the same space). You have to get a special chip that has fuel curves for the amount of compression. If you are doing a turbo kit right, you have to rebuild the bottom end with lower compression ratio (8:1 or so), and use stronger than stock components.
I wonder how reliable the Dinan Turbo kits were for the E30 M3. They made some serious power, while also seriously destroying your bank account.


My local shop tested one on there e30 and they LOVED IT.. yet they also lost the motor when the over reved the motor and it ran lean and kaboom!! They told me that the problem with the setup was the FMU(fuel mang. sys.). they are mechanical on e30's, and on the e36 they are maps uploaded to the ecu.. so here is the down fall of the e30 supercharger.. I am working on finding a company that makes a FMU that is based on either the PSI going through the intake manifold or possibily using the machanical FMU for some dyo runs to make a map of the fuel and air mix and mix it up with some stock software.. this is all just a thought I have in my head.. yet I REALY like boost and will one day have the suped e30 m3 also!!

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