Can anyone point me to a post of anyone using bigger than 60's in their car. I tried looking just can't find anything. I plan on running 75/79/85, depending, but wanted to see if they had issues with idle. I'm not really worried about rough idle, but I wanted to make sure they could idle hehe. I'm betting I will be fine, since I'm not going ridiculous like 120lbers.

I don't think I want to go with Siemens 79/86lbers cause they have a pencil spray cone, which just seems like it would atomize as much. The Delphi 75/85lbers have a 22.5/16.6, respectively, degree cone spray which the 22.5 seems like a much better idea, as far as a good spray.

Also the aftermarket harness is a low impedance converter, so on the injectors Siemens says
"Coil Resistance: 2.35 Ohms / Low Impedance / Low-Z (Peak/Hold driver circuit required)"
and Delphis' says
"Coil Resistance: 2 Ohms / Low Impedance / Low-Z (Peak-hold ECM drivers or impedance converter required)"
the converter is our harness correct? and we can run peak and hold injectors also? sorry I don't know if 42/60's were peak and hold or not.

Thank you for your help.

what are you building that makes you think you will need that much fuel?

i've don't know how much of a problem low-impedence injectors will cause, but i would try sticking to high-impedence to coincide with what our stock PCM is used to. If you need something that high, I think the racetronix 79lber disc style injectors are supposed to work great with idle quality and what not, they're just $75 a pop and i would have got them rather than siemens 60's if i had the money at the time.

the 79lbers get pissy in return style systems.

however, in returnless they work fine. very easy to set up in hpt

the 79lbers get pissy in return style systems.

however, in returnless they work fine. very easy to set up in hpt

This.

The Racetronix 79s idled fine for me, actually better then the 60s but they don't like pressure changes of a return style system.

Yea for now I think I'll keep returnless just for cost efficiency and cause I don't plan on anything past 500 HP, and I just don't want to go with 60's I don't think they'll be able to stay with what I want in the long run.

Also the place I'm buying from is only 59$ each!! so yea, wicked cheap.

Also to high impedance response, our stockers and gm 42's are high impedance but lucas and sieman injectors are low impedance, hence why the harness is used. Just wanted to verify, since I haven't touched my car nor looked up anything about it in over a year.

Yea I'll have to offset the fuel table like 60's, but I knew the pcm can handle higher, don't know how high but I'd guess up to 96lbers. Not that I'd want to run those.

Thanks guys.

racetronixs 79lb/hr work great for me too, also the reason I didn't go return style btw. No more fueling issues, car idles perfectly, and still gets great gas mileage.

and the harness just changes the connector type, those injectors are still hig impedence. do not use low impedence injectors.

have fun trying to run low impedance injectors. the reason why the harness is needed is the EV1 and EV6 connectors.

:( sad news indeed. I thought we already had ev 1. guess racetronix it is. thanks

Here are the 71 lbs injectors I am using.

http://www.rceng.com/Saturated-Injector-SH4-0750-P63C6.aspx

Idle and driving
http://www.youtube.com/watch?v=o2wAKrOS9EM