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Old 04-29-2013, 08:24 PM   #91
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Join Date: Feb 2007
Location: Australia
Posts: 1,817
My Ride: E46 M3 Turbo
Originally Posted by redneckrice94 View Post
If I understood my previous research regarding this swap correctly, for the tach, I think that it is as simple as running a crank trigger (60-2 trigger wheel) works on the non-m's. I was debating on doing a swap and still am but don't have the money as I am still in school.

Keep us updated on how this goes.
That's correct. But that is manufacturing work to get the trigger wheel made. Why bother when you could just use a Dakota Digital Tacho interface box and take the tacho output from the LS ECU into that and the output of that to the crank trigger input for the BMW DME. No manufacturing required. All DIY.

For reference an M3 uses the intake cam sensor input for a tacho. Non M uses the crank trigger input for the tacho.

BMW E46 M3 Turbo 570rwhp @18psi (old setup)
BMW E46 M3 LSX 427ci 800hp N/A
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VY SS Ute Turbo 1004.6rwhp @ 28psi E85
Ford Escort Mk2 2JZGTE 600rwhp @14 psi
04 Yamaha R1 154.3rwhp
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