I`ve had 2 HP ECUs/ Dual syncs without issue for a while now and they get their ass beat on lake Michigan.
My belief is a lot of Issues are related to electrical interference.
I use thse in different sizes and put em all over




Also resistor plugs vs non resistor.

[QUOTE=ICDEDPPL;4881209]I`ve had 2 HP ECUs/ Dual syncs without issue for a while now and they get their ass beat on lake Michigan.
My belief is a lot of Issues are related to electrical interference.
I use thse in different sizes and put em all over



I just went thru and fixed all the damage from oil lines being backwards, oil cooler having shipping caps still in cooler fittings, you name it on a 548 a guy shipped from texas that was ran for 4 hours.Had a holley terminator and dual sync, if you changed timing from 32 to 34 it picked up slight power, if you changed timing from 34 to 36, it lost 60+ hp. changed caps, wires, ignition box, coil, re synced dist at 50, set base timing, rerouted wires, checked timing at 3000, 4000, 5 etc to check inductance dwell. Exact same results. Threw a msd ready to run in it, fired injectors only, was fine, reinstalled his new looking dual sync in again, same exact issue. Borrowed a customers dual sync, poof, ran fine even at 36, defied logic. Ordered him a new one, ran fine, engine dropped 6 hp with the substitutes and the msd at 36 vs 34, 34.5 which is expected BUT did not plunge. It also had a slight breakup/slight miss with the original dual sync

So, it was the dual sync. I'm going to switch mine and see if that is where my lost 400 RPM's are.

Yep, it completely defies logic but heres yet another dyno session that tuned into multiple extra days Ill never get paid for because of these
Chinese built parts/. Theres also NO replacement module or main pieces for a dual sync aside from cap, rotor etc