Re: My experience with EFI on the FE
Yadkin, you certainly have done some great work and thanks for reporting back so thoroughly. I do need to add though that I have not seen the challenges you have. I also feel I need to say that I will try to be academic, and if any point I sound blunt or rude, please don't take it that way, because in the end, I see the hard work you are doing and I am trying to help
First, the dual vs single plane, I have installed and tuned many throttle body kits, and I am not certain you have as much of a dual plane issue as you have a FAST EZ-EFI issue. The concept that reversion is worse in a dual plane is incorrect, although reversion "could" be worse in an intake with less plenum, the longer runners and plenum should dissipate any shock. If you look up water hammer theory or any of the Ramchargers testing of intake length (resonance) tuning, it can help you to better understand resonant intake tuning.
In the end, if you added an open spacer, even a 1/2 inch, you would change the resonant tuning. However, the concept that reversion pulsates against a booster in a carb is incorrect. If it did, it would not be able to atomize at low rpm and would only run well at a higher RPM when intake charge momentum exceeded the reversion. You would have to have a wild cam, short runners, and likely oversized ports to have that issue (and it would be worse with a single plane)
Second, EZ-EFI TBs have a couple issues in my experience, first they changed their handheld at some point because the controller wasn't allowing enough tunability. With the upgraded tuner, things got a bit better, but it still is nowhere near a real tuning capability and well behind that of Holley Sniper and FITech's offering. I have seen many guys pull their hair out with that system, and often some creative wiring to feed Megasquirt box will make night and day differences
Third, ignition control is where it's at. You are very smart to consider secondary ignition (rotor phasing and cross firing/noise) but also think about the voltage that an ECU runs on, often out Ford alternators and regulators put out "dirty" voltage, as well as grounds being adequate to control voltage for 12V systems, but not adequate for lower voltage computer systems. Sometimes alternator swaps, revising grounds etc, makes a huge difference on the supply and power provision side. After all that, a system that allows you control of ignition timing makes a night and day difference in tuning. I cannot drive that home more, although a good ignition curve can be adequate, when you have one that can modify for load, RPM, barometric pressure, even which gear you are in, it is a huge improvement. Heck, consider my system, I fire the car at 10 degrees BTDC, which also interfaces with the injector timing, as soon as it fires, it goes to 20 and adjusts based on the enviromental and engine input, you just cannot do that with the EZ-EFI
Finally, there are so many other tuning opportunities in a "real" system as you poitned out. I run an OEM based sequential fuel injection on my own FE. I can log all the parameters on a laptop and control to an incredible degree. I can delay the O2 sensor signal so it accounts for distance from the exhaust valve, for low RPM tuning I can adjust injector firing for cam events, I can adjust timing, fuel curve, injector duration, amplitude and timing and I can adjust a/f for each bank, you name it it can be done with a better system. So you are 100% correct that you can do more with more, but the punch line is the EZ-EFI programming is your biggest limitation IMHO. In other words, you don't need a sequential system as much as a better system. If you could drive their TB with a better ECU, you could do more
In fact, modern NASCAR EFI has found that the higher on the intake runner, the better for fuel atomization, now they are single plane and they don't need street manners, but a TB system if controlled well can do great things.
I would be happy to BS with you on here or privately about where to go next based on what you think needs to be improved, but in the end, I think you will find that the EZ-EFI programming will hold you back, others like FITech will too, but not nearly as much. Also, if you do not have the upgraded handheld controller, which will not be perfect but slightly better, that is an option too
Hope this helps
70 Sportsroof, 427 FE/489 cid, TKO-600, 31 spline 4.10, A/C. modified Mass-flo EFI/reprogrammed A9L/CnC ported Victor.
Last edited by My427stang; 08-12-2017 at 04:32 AM.