Megasquirt Questions on my setup (trailing)
Questions on my setup (trailing)
This is on my 87 TII, stock engine, Master Power T70 with 0.96 turbine, front mount intercooler with 3" piping, 3" exhaust. MS2V3.0.
After having started the move to MS long ago I have finally had it back on the road a while now. It runs fine and has plenty of power (also plenty of lag though, going to be changing my intercooler setup over winter and hopefully some tuning will help).
Long story short, after building and installing the MS, I had the pinout wrong for the Zeal board, shop #1 figured that out but declared the ECU was bad when it kept losing signals randomly. They gave the car back when they couldn't figure anything out, also ran the e-fan that was already wired to the MS to a switch since they couldn't get the output working. Shop #2 was an MS specialist, they said the ECU was indeed bad but built me another one (no Zeal board, just MS2V3.0) free of charge so as to not turn me off to MS. They got the car running and driving and put a safe base map on but are leaving the tuning part to me.
My question is, shop #2 doesn't do much rotary work at all, they mostly focus on the older RWD turbo Volvos. He left the outputs there if I want to put them back, but he has it running on leading coils only. I know the trailing are mostly to finish the burn and account for little power-wise, but will I be ok with this setup? It is a non-emissions car, and this would also allow me to run some knock-retard systems if I wanted to, without worrying about going into negative split. There is an MSD Digital 6A to provide the extra 20* spark (it might just be their marketing, but all the older MSDs specify it is only until 3000 RPM where the Digital 6A does not).
If I am safe running leading only spark, I might use one of the former trailing wires to control my fan. I originally had a fan output in the harness but when the second ECU was built he said it was pretty barebones so I'll have to get ahold of him to see if he left an extra output.
Sorry for the book, just want to get everything sorted properly.
After having started the move to MS long ago I have finally had it back on the road a while now. It runs fine and has plenty of power (also plenty of lag though, going to be changing my intercooler setup over winter and hopefully some tuning will help).
Long story short, after building and installing the MS, I had the pinout wrong for the Zeal board, shop #1 figured that out but declared the ECU was bad when it kept losing signals randomly. They gave the car back when they couldn't figure anything out, also ran the e-fan that was already wired to the MS to a switch since they couldn't get the output working. Shop #2 was an MS specialist, they said the ECU was indeed bad but built me another one (no Zeal board, just MS2V3.0) free of charge so as to not turn me off to MS. They got the car running and driving and put a safe base map on but are leaving the tuning part to me.
My question is, shop #2 doesn't do much rotary work at all, they mostly focus on the older RWD turbo Volvos. He left the outputs there if I want to put them back, but he has it running on leading coils only. I know the trailing are mostly to finish the burn and account for little power-wise, but will I be ok with this setup? It is a non-emissions car, and this would also allow me to run some knock-retard systems if I wanted to, without worrying about going into negative split. There is an MSD Digital 6A to provide the extra 20* spark (it might just be their marketing, but all the older MSDs specify it is only until 3000 RPM where the Digital 6A does not).
If I am safe running leading only spark, I might use one of the former trailing wires to control my fan. I originally had a fan output in the harness but when the second ECU was built he said it was pretty barebones so I'll have to get ahold of him to see if he left an extra output.
Sorry for the book, just want to get everything sorted properly.
Joined: Feb 2001
Posts: 29,798
Likes: 128
From: London, Ontario, Canada
It really isn't much to add trailing. Just a pullup resistor on both D16 and D15 then the wiring changes in the engine bay. For the minimal amount of work it takes I'd enable the trailing for the gain it provides in fuel economy and emissions.
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