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My '90 325is LS3 Swap Build Thread

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  • CLM21
    replied
    I know its been a hot minute, but finally got around to finishing this build. Pictures to follow.

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  • 67Riviera
    replied
    Is this build still among the living?

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  • AWDBOB
    replied
    bump

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  • Old city bimmer
    replied
    awesome build

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  • ultimateracing335i
    replied
    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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  • Q8y_drifter
    replied
    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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  • ultimateracing335i
    replied
    That's good I was worried.

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  • CLM21
    replied
    Originally posted by ultimateracing335i View Post
    I just looked at the sikky oil pan instructions. It says to trim the baffle. Did you do that?
    I just talked to them about this and they said it was just a precaution. Some applications require it and some don't, so if you're able to install the pan with no problems then you've got nothing to worry about.

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  • CLM21
    replied
    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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  • ultimateracing335i
    replied
    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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  • ultimateracing335i
    replied
    Oil pressure switch m12x1,5 12617568480
    oil pressure switch m12x1,5 12617620512
    engine coolant temp sensor 12621710512

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  • CLM21
    replied
    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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  • 1991 e30 bmw 318is
    replied
    everything you need to wire it up is here.... http://lt1swap.com/

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  • Q8y_drifter
    replied
    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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  • ultimateracing335i
    replied
    I'll have it all figured out by Tuesday.

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