cals400ex

iTrader: (27)

i was curious if a higher than recommended duty cycle with injectors would hurt your power? i know you can have like a 90% duty cycle and still pull a good air fuel ratio all the way through the powerband. would this hurt the power level when compared to larger injectors that bring the duty cycle down to 80%, for example?

69LT1Bird

iTrader: (1)

90% won't hurt anything, it is only at WOT that you would ever see it, how long do you hold it at WOT? Nothing to worry about.

TORCHD 02 TA

iTrader: (39)

before i swapped mine out, i was at 99%. they jsut run hotter when at WOT they are always spraying

98RedBird

iTrader: (77)

You'll be fine at 90% man. It's when you get up in the 100%+ that you need to think about upping your injector. Our cars aren't as critical to keep the duty cycle's in a specific range as say a diesel, where the entire combustion process hinges on the firing of the injector. Ideally, however, you want to get as much fuel out as possible in a given amount of time to give it the maximum time to atomize. When you start pushing your duty cycle you are still spraying later into the cycle and while this necessarily won't hurt anything (As long as you don't push it too long) it's not ideal for power output.

cals400ex

iTrader: (27)

i was just using 90% as an example. i really don't know where mine is at. i figured with my mods it had to be getting up there so i figured i would ask.

kp

iTrader: (34)

My car run at 95-96% with 60s and 70psi of fuel pressure right now. its making the power I expect it to make, just because its commanded by the PCM doesnt mean it really is. Thats why people can see over 100% and still get some adjustability.

I have some of the new seimans 80s here I'm going to try soon just to make me feel better looking at the logs, I dont expect the car to make any more power though.

DIRTY_WS6

iTrader: (3)

i just did alot of mods to my ws6 and my tuner showed me on his laptop my injector duty cyle... it was 136%!!!! im now getting all kinds of codes and im running lean, so now its time for bigger injectors lmao... wish i would have seen that coming!!

Old Geezer

iTrader: (3)

Some interesting reading:
http://www.yawpower.com/injectordeadtimesarticle.html
"Dead time" and max dc go hand in hand....