77 Scorpion Megasquirt Install

[Scorpionista]

Thought I would contribute to the topic. Just finalizing the install of Megasquirt 2 and MS Relay board on my 77 Scorpion.

Used the Lancia Beta EFI intake manifold, 24lb Bosch Injectors, 56mm Weber throttle body, Aeromotive custom fuel rail and adjustable Fuel Pressure regulator.

Currently running 9:1 compression with Elgin 29 - 59 Cam (slightly milder than 40-80 cam) and ANSA 4-2-1 exhaust

In process of installing Ford EDIS distributorless ignition and 36-1 trigger wheel on crank pulley.

Anyone out there with sucesseful fuel/ignition mappping for a similar setup?

Thanks,
Cary

[DJ]

Thought I would contribute to the topic. Just finalizing the install of Megasquirt 2 and MS Relay board on my 77 Scorpion.

Used the Lancia Beta EFI intake manifold, 24lb Bosch Injectors, 56mm Weber throttle body, Aeromotive custom fuel rail and adjustable Fuel Pressure regulator.

Currently running 9:1 compression with Elgin 29 - 59 Cam (slightly milder than 40-80 cam) and ANSA 4-2-1 exhaust

In process of installing Ford EDIS distributorless ignition and 36-1 trigger wheel on crank pulley.

Anyone out there with sucesseful fuel/ignition mappping for a similar setup?

Thanks,
Cary

My setup is very similar but I used stock Bosch injectors, a 60mm Weber "Big Throat" TB, an Alquati 40-80 on the intake, Croft 4-1 exhaust, end-cam distributor driven by the MS, and 4 mm domed pistoni that I haven't cc'd but generally provide just over 10:1 CR on a 2 liter.

Is yours a 1.8 or 2.0 liter?

I haven't had it on a dyno for tuning yet but I have it running pretty nicely overall. Still needs some tuning, though once we get some better weather.

[Scorpionista]

My car presently has a 1.8 motor with 10,000 miles on it. I also have a rebuilt blueprinted/balanced 2.0 motor with 9.8:1 pistons. I want to sort out the Megasquirt/EDIS install first, before eventually swapping in the new motor.

I found the larger Bosch 0280150151 240cc/min 23 lb injectors that were fitted to 1978 -1981 633 BMW's. Somewhat larger than the Fiat/Lancia stock 178 cc/min 16.95 lb injectors.

With the increased injector size, they will provide fueling to support up to a theoretical 185 HP ( .45 BSFC @ 55 PSI). More than sufficient for a streetable, naturally aspirated motor.

This will be fun!

[Scorpionista]

Update 3/6/10

Megasquirt 2, relay board and Jim 1.4 Stim board completed.

Intake tube designed and tig welded, along with fuel rail and water housing.

Next project is removing crank pulley and fitting a 36-1 trigger wheel for Ford EDIS distributorless ignition.

Kudo's to DJ for clean and thoughtful design of relay board bracket to hide IAC and wide band LC-1 reset button/led. I will be fabricating something similar.

I will be uploading some of the fotos to my gallery.

[John Allen]

DO NOT use the relay board! I have one of the first MS installations and used this board (the only thing you could use back then) and the ONLY problems I have ever had with my car has been with the relay board.

The traces are too small and will oxidize quickly if installed in the engine compartment. The terminal bindings, appear like a great idea, are not. It is much easier to just mount a couple weather proof relays and fuses and use GOOD weather tight connectors to allow quick disconnects at the engine. Besides, soldering up that 37pin connector (at two ends) is a REAL bitch!

My car is currently dead because the trace to the main relay on is corroded. I will no fix that again! It is time to pull the board out and fix it properly, once an for all....

Update 3/6/10

Megasquirt 2, relay board and Jim 1.4 Stim board completed.

Intake tube designed and tig welded, along with fuel rail and water housing.

Next project is removing crank pulley and fitting a 36-1 trigger wheel for Ford EDIS distributorless ignition.

Kudo's to DJ for clean and thoughtful design of relay board bracket to hide IAC and wide band LC-1 reset button/led. I will be fabricating something similar.

I will be uploading some of the fotos to my gallery.

[Scorpionista]

John,

Thanks for the advice, I may have to reconsider my wiring design.

Appreciate the voice of experience. DJ's design is very clean.

[beek]

My setup is very similar but I used stock Bosch injectors, a 60mm Weber "Big Throat" TB, an Alquati 40-80 on the intake, Croft 4-1 exhaust, end-cam distributor driven by the MS, and 4 mm domed pistoni that I haven't cc'd but generally provide just over 10:1 CR on a 2 liter.

Is yours a 1.8 or 2.0 liter?

I haven't had it on a dyno for tuning yet but I have it running pretty nicely overall. Still needs some tuning, though once we get some better weather.

im looking for a 60 cfl! cant find one anywhere