Nevermind. Magnaflow's site filters stink. I BELIEVE this is it - https://www.magnaflow.com/products/...ght-through-performance-exhaust-muffler-12579
Spark is all coil beyond about 3500-4000 RPMs. I run a .020 gap at 12 psi.
Did you convert to sequential or still batch-fire?
It’s starting to break up around 5200 so it maybe the gap as well. I’ll lower it to .020 and see what it does. I have 2 MSD TFI coils laying around but I’ve had them fail before so went back with factory.
Still batch fire.
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What's your A/F when it breaks up?
Red truck is sequential; has been for a while. I used a junkyard Mustang injector harness and wired it into the square engine connector in the spots I took the smog-related leads out of. I'm running 1000cc (95 lb) injectors. I see 60% duty cycle just before it shifts at 5500 rpms, 16 lbs of boost.
Be careful on pump gas. I was non intercooled with my Novi couple years ago running 20+ psi with no intercooler.. iat's like 230 degrees and I lifted a head. And that was with E85. I would say you are on the edge on pump gas. Also for plug gap with TFI I had to gap down to .016 to keep it from blowing out the spark. That was with a 6A style box and good ignition components. Glad I went CNP lol.Any where between 12.0 to 11.5. Depending on boost level
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Definitely more tuning window with a good intercooler.Thanks for the input and info man Derrick! I will change the gap to 020 to start and go from there. Good to know that 016 works if needed though. I’m watching the IAT’s closely and with that knowledge, know that an intercooler set up is in the not to distant future.
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I haven't really tried to open up the gap too much. Think I still have them at .020. my thought process is at max boost/power as long as it's lighting off it doesn't matter. The bigger gap may help with fuel efficiency or something but I doubt it makes any negligible difference under full load. Even if it did add 5 hp then I can just add a 1/4 lb of boost haha.What are you able to gap them at with the COP set up?
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I haven't really tried to open up the gap too much. Think I still have them at .020. my thought process is at max boost/power as long as it's lighting off it doesn't matter. The bigger gap may help with fuel efficiency or something but I doubt it makes any negligible difference under full load. Even if it did add 5 hp then I can just add a 1/4 lb of boost haha.
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