Speeduino MPFI vs Holley Sniper EFI or MPFI vs TBI(my observations)

I figured I'd just throw this info out there based on my experience between two different EFI systems.

I have a 76 Ramcharger that I built a Speeduino MPFI system for on the stock low compression 440 motor. I used a crank mounted 60-2 wheel with a hall effect sensor, a set of LS D585 truck coils, a Edelbrock mopar EFI manifold and a Holley throttle body. I tried both the Speeduino V0.4 and seawolf UA4C based boards. At idle I tuned the motor to a best of 33kPa with around 24 degrees of timing, the engine seemed to run very smooth at idle and low speed cruising. Under some higher load situations I could never tune out some surging issues that I determined to be either speeduino or RFI/EMI related that I could never find with my scope. It also developed some really weird situations where the RPM signal would surge all over the place yet show a perfect square wave in tunerstudio and with scope.

Having also installed a Holley Sniper on my 67 Dart I abandoned the speeduino as I was sick of screwing with it for 4 months. I used the Holley Sniper with the hyperspark distributor. My idle now is around 38-40kPa with around 23 degrees of timing and on some of my initial test drives the Holley Sniper has been flawless in throttle response and drivability on the same route I took the vehicle with the previous EFI system.

At the end of the day I can say the Holley Sniper is a great platform working on 2 of my vehicles. On this low compression 440 in the Ramcharger I can say it responds just as well as a MPFI system. I must clarify that I can't say this a perfect A/B test between systems but after getting familiar with these self-tune EFI systems over the past couple years I wouldn't hesitate to say that Holley developed a great product that stands on its own next to MPFI systems.