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Old 07-27-2019, 10:31 PM   #681
blue91lx
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I love these frankenstein engine projects Take lots of pics please!
Me too! This is really a dream come true. I just happened to fall into the cylinder head and engine in such a way where I can still make money while building Linda the way I wanted to all along.

I had an eventful evening tonight. Got both motors pulled. The next day I have off I'm going to swap all of the early model stuff onto Linda's motor, swap transmissions, and drop it in Black Betty.

Got me a nice lil' Stromung for Linda as well. I bought the Magnaflow 23554 downpipe/cat section so when I buy my IE Long Tubes all I have to do is weld vbands onto the collectors, weld up a Y to the cat section and join it up (as well as adding two 02 bungs, one for the 02 and one for a wideband).

It's so great taking apart a car you just assembled. The black car, not so much. Whoever built it used "new" soft ****ty shiny nuts on everything and multiple things stripped, broke, etc. Linda came apart like butter because I used all OEM grade hardware.

Untitled by Bobbie Morrone, on Flickr
Untitled by Bobbie Morrone, on Flickr
Untitled by Bobbie Morrone, on Flickr
Untitled by Bobbie Morrone, on Flickr
Untitled by Bobbie Morrone, on Flickr
Untitled by Bobbie Morrone, on Flickr
Untitled by Bobbie Morrone, on Flickr
Untitled by Bobbie Morrone, on Flickr
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Old 08-14-2019, 07:02 PM   #682
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Picked up my ECU setup for the build. MS2PNP from DIY. Not pictured: an injector harness wired for semi-sequential batch firing. I know very little about Megasquirt and have been reading as much as I can- I have a feeling I'll have a few questions if there are any MS gurus willing to lend an ear.

I'm going to copy Digitalwave's intake setup with his KAM intake to a pipe with an IAT. I would like to run a simple wasted spark setup, but am still figuring that out at the moment. I also have no idea how to set this up for a variable TPS (M50). I'm thinking it'll be much better than an E30 TPS when running speed density.

My pistons are almost ready to order- I need to CC the 731 head to get our final measurements for compression, and then those will be on the way. Once I list/sell the Ronals in the garage I can place my IE order for the Billet 284/280, HD Rockers, Long Tubes, and a few other small things.

I'm getting very excited!


Untitled by Bobbie Morrone, on Flickr
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Old 08-14-2019, 07:49 PM   #683
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Definitely worth doing a proper TPS
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Old 08-14-2019, 10:10 PM   #684
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Definitely worth doing a proper TPS
OH yeah. The E30 TPS is a switch and the M50 TPS is a potentiometer. With no AFM signal I don't think a switch with just an idle or WOT function will cut it since I'm tuning on manifold pressure and intake air temp.

Megasquirt support is so vast and in depth that it makes it difficult to find your answer .
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Old 08-15-2019, 09:16 PM   #685
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I tried without a proper TPS. Don't waste your time It works, but it's a PITA. Maybe on a big lazy V8 with an automatic trans it would be OK... but meh. Not worth the hassle of trying to make it drive smoothly and idle smoothly and such.
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Old 08-16-2019, 10:20 AM   #686
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My experience with megasquirt has been quite good actually. The key for me was getting my VE maps good. Essentially, get your car to start okay (you wont get it perfect until your VE map is good so dont waste to much time on startup/idle). Setup your target AFRs and base timing. Go out and let the squirt autotune. Keep autotuning until its not making big changes.

TPS signal is not all that important for speed density tuning if I recall. Other than knowing when to switch from closed to open loop, I don't think it matters much. If your going to tune in alpha or ITB mode then it is all that matters.

I would not call myself an expert so take my advice as such.
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Old 08-16-2019, 08:21 PM   #687
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I tried without a proper TPS. Don't waste your time It works, but it's a PITA. Maybe on a big lazy V8 with an automatic trans it would be OK... but meh. Not worth the hassle of trying to make it drive smoothly and idle smoothly and such.
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My experience with megasquirt has been quite good actually. The key for me was getting my VE maps good. Essentially, get your car to start okay (you wont get it perfect until your VE map is good so dont waste to much time on startup/idle). Setup your target AFRs and base timing. Go out and let the squirt autotune. Keep autotuning until its not making big changes.

TPS signal is not all that important for speed density tuning if I recall. Other than knowing when to switch from closed to open loop, I don't think it matters much. If your going to tune in alpha or ITB mode then it is all that matters.

I would not call myself an expert so take my advice as such.
Oh yeah I'm definitely doing the M50 TPS and ditching the stock one. And yeah, I'm running speed density until I get my ITBs setup, at which point I'll be just alpha n, so I figured getting the settings in MS early on with the right TPS will be worthwhile. Plus it totally changes your ability to tune accel enrichment tables if you don't have an on/off throttle position switch haha.

And yeah I've heard of several people running into issues with not setting the VE tables properly. There is a very smart fellow who has built a few very powerful n/a E30s on another forum who helped me spec my cam. When it's all up and running I'm going to have him help me set that up. I also have a thread where several guys with very similar setups share all of their mapping, so I'll have a good place to start!

I bought another parts car today. It's a 130K mile 1990 325iS. It was a beautiful car before it was wrecked. I also picked up wheels for the M3! I've been looking since I got the car and finally found a mint set of E38 style 5s (same wheels I filled/drilled for Linda). Thankfully these just bolt right up to the M3, no funny business. Will be running a 225/45, likely another RT615K+ because they're affordable and have treated me very well so far on the iS.


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Old 08-17-2019, 08:08 PM   #688
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ITB mode is definitely worth using for actual ITBs
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Old 08-17-2019, 11:44 PM   #689
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ITB mode is definitely worth using for actual ITBs
Yep, I'm going to get the car running/engine broken in on speed density with a stock intake and ported throttle body and then switch to ITBs and alpha-n.

These will be the ones. With the plenum they pick up pretty great power in all the right places.

http://racehead.com.au/products-page...e30-cf-plenum/
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Old 08-19-2019, 01:22 PM   #690
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Whoops forgot about throttle accel enrichment. Its been awhile since I did any tuning. Definitely useful for that. You'll want to have good maps to tune accel enrich as well.

I'm excited to see you work through the ITB set-up. Be sure to post up what you learn so I don't make the same mistakes. That set-up looks pretty awesome.
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