'88 325is M30 street car-->S54 -->S50 -->M54 Enduro Race car

[JGood]

Maybe I'm missing something, but why can't you guys just use a Dakota Digital SGI-8? That's what I used with my m60 swap. Tell it how many cylinders your engine has, how many cylinders your tach is expecting, and you're done.

[The Dark Side of Will]

S54 revs higher than the tach reads

[nando]

I haven't looked at a BMW coding plug yet, but I've recalibrated GM tachs. Those are just an RC oscillator (change R, C or both to change calibration) and a crystal oscillator as a reference. BMW being BMW, they may have used a timer chip to produce an extra clean calibration signal instead of the raw output of the RC oscillator.

So does the coding plug have an IC, a resistor and a capacitor in it?

Here's an outfit that claims to have a few in stock:

http://www.seekchip.com/icstock-H/HML087.html

However, the link to the .PDF on that page goes to some other chip's datasheet.

http://www.seekdatasheet.com/SearchPartNo.html

There's a surprising amount of static on the google for that part number.

I dont think it has any logic, i believe it just has a few bytes of data that the SI board uses to scale the tach (among other things).

I've searched for hours on google. Those links are basically chinese spammer fronts.. :(

Maybe I'm missing something, but why can't you guys just use a Dakota Digital SGI-8? That's what I used with my m60 swap. Tell it how many cylinders your engine has, how many cylinders your tach is expecting, and you're done.

The m20 tach works as-is but as Will says the end of the range is too low. An S54 revs to 8,000 stock and can safely do 8200-8300.

[gills]

I noticed that you are using an E36 transmission crossmember. Does this definitely work?

[The Dark Side of Will]

I dont think it has any logic, i believe it just has a few bytes of data that the SI board uses to scale the tach (among other things).

I've searched for hours on google. Those links are basically chinese spammer fronts.. :(

Yeah, that's what it looked like... cheap offshore houses who think that you'll buy anything they put in front of you, if they can only lie enough to get you to go to their website.

I didn't know BMW tachs were digital that long ago. GM was DEFINITELY still analog in the '80's.

[FredK]

I noticed that you are using an E36 transmission crossmember. Does this definitely work?

He probably meant E30 manual transmission crossmember.

[gills]

He probably meant E30 manual transmission crossmember.

Sorry for the noobness infiltration guys...so the crossmember from my '90 325is will work with the E36 ZF?

[FredK]

Yes. Stock manual crossmember works with S54/ZF 5-speed.

[gills]

Yes. Stock manual crossmember works with S54/ZF 5-speed.

thank you, sir!

[The Dark Side of Will]

Yes. Stock manual crossmember works with S54/ZF 5-speed.

And anything else bolted to the ZF... like an M60.

[gills]

Cool.

Can you use the s54 starter with the e36 m flywheel or do you need an e36 one?

[Jb325is]

Oops, sorry, yeah I meant e30 trans crossmember. And yes, from what I've read the s54 starter will work with the e36 flywheel.

Picking up my engine this afternoon. My shipment took a while because of the weather up north the last couple weeks I guess. Time to send off my ecu and gather the last few parts I need to finish the swap. I still haven't painted my engine bay unfortunately, need to figure that out quickly.

Oh and I also bought some wheels I'm quite excited about, not going to run the M-systems on the e30 anymore. I bought a set of concave BBS RC302's

[wark]

in!

[GK-E30M3]

Subscribed and Happy where my wheels are going


.

[LJ851]

Picking up my engine this afternoon.

I thought i felt a disturbance in the force. Where are the pics, man ?