I'd have to disagree with you here. That's practically the only way to do it without investing in expensive external pumps, surge tanks, etc. There is no reason to avoid setting up your fuel system to activate the 2nd or 3rd pump based on boost pressure, rpm, or whatever trigger you want to use as long as the rest of your systems are set up to handle it. The newer fuel pumps that we are using today actually require less demand of your electrical system than they did years ago due to technology upgrades - both electrical and internal hard parts/design. Running 2 or 3 pumps full time is actually detrimental as you are placing that load full time on your systems-you're overheating the fuel-you could possibly cause fuel pressure issues if you have too much fuel flowing to the injectors and not enough return, and you'll wear out pumps prematurely. I've been a member here since 2002 and there have been literally hundreds of threads on this forum where guys couldn't figure out their fuel issues. Come to find out, most of them were trying to run 2 or 3 pumps full time and that was their issue. Once they corrected that, everything went back to normal.
It's true you need to have the injector offsets correct, but if you're having fueling issues and you don't have this information entered correctly, then that is the reason. Blaming it on voltage drop due to staged pumps kicking on is like blaming ignition timing issues on drift when you never had the sync reference set up correctly in the first place. Nonsense. Most quality injector companies provide this data, but it's up to the tuner to enter it correctly, and if not that's on the tthem.
Staging pumps is not "over complicated", and in fact I'd go so far as to say it's pretty much SOP for street cars making big horsepower on E85.
Yup, yup and yup. Agree with all this.You actually need to replace the cable that goes from the alternator to the fuse box. PHR sets a nice kit. It's not cheap, but it's very high quality.
Relating to the OP, I have ID 1340 cc/min injectors and PHR E-85 fuel system with two Walbro 485 pumps and PHR's three-pump harness in case I ever want to go bigger. On my one and only boost setting (setting for my 91-octane map), the car made 730 whp. The SP Engineering Dynojet was not working and the Mustang was acting cranky as well so that's where we stopped.
I don't have duty cycle or boost data yet, but will obtain both the next time I'm down there and update this thread accordingly.