Thread: USDM STI yellow side feed injectors - Definitive flow rate

what latency are you guys running your sti injectors at?

most high impedance injectors i start at 1ms

I was told by the guy selling them on the forum that they flow more than USDM? Either way I'm not sure but he is selling them shipped for $100 less than almost everyone else

I need a final verdict on whether or not these are as good as the USDM (as far as flow rate). These will be used in my DET/VE build in attempts to make 350+ whp

you should be right in that ballpark especially if you run 4bar. I'm not sure exactly how much power I had but I ran 8.1 1/8th at 90mph with them at 4bar and 95% duty cycle. My new 835's came in today

My JWT tune with these was very conservative. I use my calum now and it's a total difference I'm at about 80-85% duty cycle with my setup.

mines @ .82ms

thanks

I'm at .75ms

nistune reads it differently kinda.. in the dash panel the gauge shows .##ms, but in the menu you change the value it says 600 (well it did an i found alot of stock bins to have the same) and i Think what that means is .60ms since thats what it shows in the dash panel gauge..

i think right now its at like 580 (so .58ms i think) but honestly im questioning it..

my car when cold idles in the low 13's AFR, but when warm low 14's AFR, the cruise is also stoich but my wot afr's took some work to get right, for example my high load high rpm area i had to lean out to get to 13.1 afr but low to mid range rpm full load i had to richen up quite a bit to get to 13.1 and this really makes my fuel map look funny..

oh and another thing, i had to up my injector multiplier quite a bit from what nistune suggested to get to this point.

one thing i have done is messed with the cold start stuff, before with the ve injectors my car would NOT start with out holding the gas pedal a little tiny bit, but now the damn thing will damn near run with out assistance.. (im sure my iacv is broke an has alot to do with it though)

.58ms is really fast, you may back it off closer to 1ms and see how it does. Pretty sure they need a little more recoop time than that. I'd say you're overworking the injectors at higher rpm's and causing them to do funny things. You need a little more "dead time."