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My '90 325is LS3 Swap Build Thread
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I know its been a hot minute, but finally got around to finishing this build. Pictures to follow.
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Did you wire in your bmw tach with the gm tach signal. I don't know what I need to get it to work.
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I trimmed mine just in case. Wasn't sure if it was needed and said fuck it and just did it.
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Originally posted by ultimateracing335i View PostI just looked at the sikky oil pan instructions. It says to trim the baffle. Did you do that?
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Awesome, thanks. I'll probably just pick up some thread adapters if that's the case.... Sounds like an easy enough fix.
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You have to modify the coolant temp sensor to fit the ls head. It has to be turned into m12 1.5 thread. The oil pressure switch is to small to fit where the gm one goes. I bought a drain plug that fits the gm hole and drilled and tapped it to fit the bmw sensor.
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Oil pressure switch m12x1,5 12617568480
oil pressure switch m12x1,5 12617620512
engine coolant temp sensor 12621710512
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Does anyone have part numbers for the e30 coolant temp and oil pressure sensors?
^ I'm not worried about the engine harness side, that's easy enough. I'm worried about the bmw side. That shits confusing. Looking under my dash right now boggles my mind.Last edited by CLM21; 03-01-2015, 07:51 PM.
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I haven't figured it all out yet, but for now I was able to source an engine harness and a 411 ECU from an 04 Chevy Caprice LS1/4L60E. Ran me about $200 for both.
The fuel level sender, fuel pump, speedo and all other accessories should all be wired to the BMW fuse box. So no need to worry about that.
I also had a 16" Spal fan mounted and connected to the AUX fan pin in the fuse box which runs full speed all the time (might redo that and stick a fan controller later on).
Running an Autometer tach at the moment with my current RB engine (My car is a 316i, I never had a tach to begin with) and will be buying aftermarket gauges for coolant, oil temp, pressure and AFR.
A friend of mine will be helping me out with the rest of the wiring.
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