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santarosamgbOffline
Post subject: What does it takes to run a M70 engine with carburetors  PostPosted: Apr 08, 2015 - 07:09 PM
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I plan to run a M70 engine using downdraft carburetors with custom intake manifolds and a manual transmission. I only need to worry about getting ignition sparks and timing to the distributors.

What do I need to do to obtain ignition sparks and timing to the two distributors. How do I use the original ECUs off the V12 BMW (1991) to make this happen?

Thanks for any inputs.
Razz
 
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jdinnerOffline
Post subject: RE: What does it takes to run a M70 engine with carburetors  PostPosted: Apr 15, 2015 - 11:56 PM
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Inputs are the key. You need the original throttle, MAF, IAT, TPS and injectors to provide feedback to the computers in order to determine ignition advance.
You would need a programable computer to run just the ignition and that is probably in $1500 to $2000 range. The other option is to run two 6 Cyl GM HEI distributors on the ends on the cams. Easy to do.

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Richard454Offline
Post subject:   PostPosted: Apr 17, 2015 - 07:48 PM
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Location: Atlanta, GA
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Talk to the guys - Matt at DIYAUTOTUNE http://www.diyautotune.com/

Before I wentt w/ ITB - I was looking at running Weber IDEs. The electronics were around $700. For $1300 you can get a piece that will run individual coils packs- GM LS coils w/o any drivers- but would have to convert a dist to a cam sensor- That's easy to do as the E30 guys have one availible-



If you are looking for a bolt on- here's a Weber flange for the m70

http://www.dbilas-shop.com/Products/Inlet-manifold/BMW/Intake-manifold-for-BMW-750-850-5-0-24V-M70::1820.html






Here's mine- almost finished-

DSCN5053 by richardhayes454, on Flickr
 
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santarosamgbOffline
Post subject:   PostPosted: Apr 19, 2015 - 05:09 AM
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Hi Jim

If I want to run a M70 engine with downdraft webers (with custom intake manifolds), the engine would not then have MAF,I AT, TPS and injectors. Can I still manipulate the original computer to get ignition sparks and ignition advance without any feedback from original throttle, MAF, IAT, TPS and injectors.

IS there anyone on this forum ever ran two 6 cylinder GM HEI distributors on the ends of the cams. I assume this two distributors set up would require point and condensers or custom electronic ignition.

Thanks
 
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jdinnerOffline
Post subject:   PostPosted: Apr 20, 2015 - 12:44 AM
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HEI distributors are electronic but only require one wire to run. (no points). I'm telling you that the computer needs to see the feedback from those sensors or else it simply won't come out of limp mode. You can get HEI distributors off ebay for $60.00 each.
http://www.engineswapdepot.com/?p=4190
There is a typo in the article - they used straight 6 distributors, not straight 8.

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cribbjOffline
Post subject:   PostPosted: Jun 12, 2015 - 02:30 AM
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An alternate way of getting spark would be to put a 36-1 trigger wheel on the front dampner (or the flywheel), mount 2 pickups, 60 degrees apart from each other, and use a combination of 2 x Ford EDIS-6 ignitions and 2 x Megajolt Lt Jr. programmable ignition modules.

With this setup, no need for cam driven distributors, or the OEM ECU's, and the Megajolt Lt Jr. modules are VERY simple to program.

I breakin my supercharged V8's in naturally aspirated trim with a 4bbl Holley carburetor, an EDIS-8 and a Megajolt Lt Jr module. Couldn't be simpler.

http://www.autosportlabs.com/product/megajolte/
 
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