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Megasquirt Distributor Control

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Old 10-28-2017, 09:10 AM   #1
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Megasquirt Distributor Control

As the title hints at: i'd like to set up an MPFI system using a megasquirt (as i know others have done before). I'd also like to have the Megasquirt control the timing once the CCC Qjet comes out. From the research i've done, my 86 LG4 has the big cap CCC distributor (which i believe is a 7 pin HEI module). I've seen a tech article from DIY Autotune where they do this on an older SBC (link below). Has anyone done this? Am i missing any important details? Thanks for the help.

https://www.diyautotune.com/support/tech/install/chevrolet-gm/carb-to-efi/part2/
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Old 10-28-2017, 10:24 PM   #2
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Re: Megasquirt Distributor Control

Quote:
Originally Posted by AssaulT/A View Post
As the title hints at: i'd like to set up an MPFI system using a megasquirt (as i know others have done before). I'd also like to have the Megasquirt control the timing once the CCC Qjet comes out. From the research i've done, my 86 LG4 has the big cap CCC distributor (which i believe is a 7 pin HEI module). I've seen a tech article from DIY Autotune where they do this on an older SBC (link below). Has anyone done this? Am i missing any important details? Thanks for the help.

https://www.diyautotune.com/support/...-to-efi/part2/
Yup. Did you buy the Megasquirt yet?

Personally I like the Microsquirt and Microsquirt module. You don't have to modify things to change how it works, and it's a surface mount board meaning less prone to issues. (MS2 is through hole).

I'm using a Microsquirt module inside a stock GM ECM case so it's plug and play:

http://members.cisdi.com/~anesthes/projects/megasquirt/

-- Joe
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Old 10-28-2017, 10:54 PM   #3
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Re: Megasquirt Distributor Control

I haven't bought the Megasquirt yet, i'm focusing on the hard parts first (fuel rails, throttle body, etc). I figure they'll keep me busy enough to spread out the cost hit over a few weeks.

For a standalone FI setup (that will accomodate a future 383 with new injectors), do you think a Microsquirt would be better? I was under the impression that it wouldn't control timing electronically like i want to do. I have and will be keeping a manual trans if that makes a difference (no auto transmission functions needed)
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Old 10-29-2017, 06:01 PM   #4
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Re: Megasquirt Distributor Control

Quote:
Originally Posted by AssaulT/A View Post
I haven't bought the Megasquirt yet, i'm focusing on the hard parts first (fuel rails, throttle body, etc). I figure they'll keep me busy enough to spread out the cost hit over a few weeks.

For a standalone FI setup (that will accomodate a future 383 with new injectors), do you think a Microsquirt would be better? I was under the impression that it wouldn't control timing electronically like i want to do. I have and will be keeping a manual trans if that makes a difference (no auto transmission functions needed)
A microsquirt is the same as a megasquirt, it's essentially a MS2 but better electronics. The only different is the stepper IAC circuit is external (add on board/module/etc), and it cannot fire a coil directly (requires an ignition module or ignitor). You'll be using an HEI distributor + module.

-- Joe
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Old 10-29-2017, 09:17 PM   #5
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Re: Megasquirt Distributor Control

I see on the website thag the IAC mod kit won't work with the standard Microquirt, only the module board. Would i miss not having an IAC valve?
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Old 10-29-2017, 10:07 PM   #6
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Re: Megasquirt Distributor Control

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I see on the website thag the IAC mod kit won't work with the standard Microquirt, only the module board. Would i miss not having an IAC valve?
The Microsquirt uses an external iac module. Diyautotune doesn't sell them. Google Microsquirt stepper adapter. Two companies make them. I have the Canadian one in my shop.

This is the most common one:

http://www.efisource.com/shop/micros...epper-adapter/

But I prefer this one:

http://efi.ttrignition.com/products.html

Might have to email him. That one converts a PWM signal to a stepper.

You can also build one.

-- Joe

Last edited by anesthes; 10-30-2017 at 12:35 PM.
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Old 10-31-2017, 09:46 PM   #7
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Re: Megasquirt Distributor Control

I like what you're suggesting, looks much more sturdy and easier to package than a megasquirt. Any thing else i should know? I'm new to this, trying to make sure i'm covering my bases.

thanks,
harrison
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Old 11-02-2017, 09:54 AM   #8
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Re: Megasquirt Distributor Control

Quote:
Originally Posted by AssaulT/A View Post
I like what you're suggesting, looks much more sturdy and easier to package than a megasquirt. Any thing else i should know? I'm new to this, trying to make sure i'm covering my bases.

thanks,
harrison
Make sure you install the latest ms2extra firmware, and read the documentation at the ms2extra site.

The Megasquirt can run two operating systems B&G and Ms2extra. They are functionally different, and when google searching a lot of the information is based on the B&G software, which doesn't apply to Ms2extra. This causes a lot of confusion and problems.

Again, I prefer the Microsquirt module because you can stick it in a stock ECM case and it's very expandable. The way mine is setup (first link I sent you) It's plug and play with my factory '88 TPI harness. The only thing I had to do was use the MAF wires for a MAP sensor.


-- Joe
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Old 11-12-2017, 12:27 PM   #9
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Re: Megasquirt Distributor Control

I ordered the standalone microsquirt with harness yesterday, along with the intake manifold, fuel rails, and throttle body. Today i'm gonna order the rest of the odds and ends I need (fuel line, fuel pump, injectors). Hopefully I can get this up and running before the end of the calendar year.
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Old 11-13-2017, 04:01 PM   #10
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Re: Megasquirt Distributor Control

Quote:
Originally Posted by AssaulT/A View Post
I ordered the standalone microsquirt with harness yesterday, along with the intake manifold, fuel rails, and throttle body. Today i'm gonna order the rest of the odds and ends I need (fuel line, fuel pump, injectors). Hopefully I can get this up and running before the end of the calendar year.
Did you order the IAC adapter too?

-- Joe
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Old 11-14-2017, 08:53 PM   #11
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Re: Megasquirt Distributor Control

Not yet, i wanted to confirm with you what (i think) i found on the internet: Chrysler and GM IACs are basically the same right? The Holley TB i ordered comes with a Chrysler IAC but all other sensors are GM style.
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Old 11-15-2017, 10:40 AM   #12
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Re: Megasquirt Distributor Control

Quote:
Originally Posted by AssaulT/A View Post
Not yet, i wanted to confirm with you what (i think) i found on the internet: Chrysler and GM IACs are basically the same right? The Holley TB i ordered comes with a Chrysler IAC but all other sensors are GM style.
They are not. The Holley 4bbl throttle bodies come with Christler IAC's, which are wired differently. I'm not sure about the TPI throttle bodies.

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Old 11-15-2017, 09:22 PM   #13
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Re: Megasquirt Distributor Control

Well dangit. Guess I need to find a different throttle body then
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Old 11-16-2017, 12:45 PM   #14
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Re: Megasquirt Distributor Control

Quote:
Originally Posted by AssaulT/A View Post
Well dangit. Guess I need to find a different throttle body then
You can wire it, just need to know which wires go to which coils.

MS has the ability to do a IAC test so you can command the pintle in and out.

-- Joe
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