Megasquirt thirdgen lives.
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Senior Member
Joined: Nov 2000
Posts: 601
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From: Queen Creek, AZ
Car: 91 Formula
Engine: 383 HSR
Transmission: 5th 700R4
Axle/Gears: 3.89
Megasquirt thirdgen lives.
Well I've finally got my 91 bird back up and running with a megasquirt efi controller. It's a MS1 V3.0 w/MSnS-extra code 2.29q I'm using it to control the factory computer controlled ignition, the injection, the fans, and have a few more mods to do for it to control the lockup converter, nitrous activation, shift light, and knock sensor. I'll keep everyone posted on the progress. I've got it running right now but it still needs alot of tuning which will come as time allows. by the way I've got a 383 with as&m semi siamese runners accel base 30lb injectors and afr 195 heads.
Last edited by 91RamAir Formula; Sep 5, 2006 at 09:54 AM.
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Joined: Sep 2005
Posts: 2,151
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From: Osceola Indiana
Car: 92 RS(sold) 1989 IROC-Z
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: ones that turn
about how much did the megasquirt set you back cause im thinking about this setup when I supercharge the iroc or maybe turbochage
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Joined: May 2001
Posts: 58
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From: Columbus, Ohio, USA
Car: 86 Z28
Engine: 305TPI stock
Transmission: TH700R stock
How did you tie into the stock wiring harness? Did you just splice wires? Did you totally eliminate the stock ECM or is it still in there?
I've been thinking hard about the MS system for my TPI but I want to know what I'm getting into first. Congrats though on your setup let us know how tuning goes.
I've been thinking hard about the MS system for my TPI but I want to know what I'm getting into first. Congrats though on your setup let us know how tuning goes.
Thread Starter
Senior Member
Joined: Nov 2000
Posts: 601
Likes: 0
From: Queen Creek, AZ
Car: 91 Formula
Engine: 383 HSR
Transmission: 5th 700R4
Axle/Gears: 3.89
well I just spliced the wires from the factory ecm connectors into the megasquirt connector. It is working pretty well but I have had a couple of problems that I have been dealing with. The tuning is coming along nicely.
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Posts: 4,432
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From: garage
Engine: 3xx ci tubo
Transmission: 4L60E & 4L80E
I didn't think the V3.0 boards and MS1 have enough outputs to control all that stuff. Does the latest MS1 code include coolant fan(s) control, lockup conv. control, nitrous control, shift light, knock sensor? Or is that all stuff you are coding yourself?
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Joined: Jul 2005
Posts: 2,123
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From: North Central Mass.
Car: 1985 Berlinetta
Engine: Megasquirted TPI
Transmission: Transgo 700R4
Axle/Gears: 3.42
Thats the plan! 
I was doing extensive reading last night, looks like you can use the fast idle output to control the lockup without any difficulty at all. How does our engine decide the transmission is in 3-4. IF there is a 3-4 switch, I will use it to make the lockup work. The megasquirt only has the ability to lockup the transmission based on engine MAP, not speed, So i will need a 3-4 override switch of some kind.
I was doing extensive reading last night, looks like you can use the fast idle output to control the lockup without any difficulty at all. How does our engine decide the transmission is in 3-4. IF there is a 3-4 switch, I will use it to make the lockup work. The megasquirt only has the ability to lockup the transmission based on engine MAP, not speed, So i will need a 3-4 override switch of some kind. 
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