Pretty much a newb on injector data/sizing
Got a couple questions that might be easier for someone little more advanced to answer. Been tuning camed vehicles with injector swaps but always found correct injector data with no problem. Have a friend with a Texas speed 408, Boost reference 1.1 FPR 58psi base pressure and BW S475. Just swapped from On3 turbo to S475 so still in middle of retuning the whole VE table. He bought Fast 87.8Lb injectors which nobody really had true injector data cause they don't offer data themselves.
1st question. If the injector data isn't 100% spot on can the duty cycle be off and misleading? At 10psi and 6500-7krpm (cause hes manually shifting it instead of letting pcm shift it at commanded 6krpm) starting to hit 100-110% Duty Cycle. Starts to lean out a hair when this happens but haven't ever hit this high of rpm before so the VE data hasn't been touched this high before just interpolated from the old turbo setup.
2nd question. Is 87lb Injectors too small for a 408 on 10-14psi? Or should he have went bigger from the get go?
Just relooked at the tune and the Injector flow rate vs vacuum is lower than what I remember seeing on the tune I've found searching the net for correct data. It should be higher than 42.6-46.6 correct? I've revised the tune so many times maybe that's part of the problem and Duty Cycle being misleading.
Mainly worried if these injectors are too small or not for such a big motor on boost. If not then Ill continue searching for better data.