Need Injectors

[BlackY2kZ28]

Took my z28 for a dyno tune and they said i need 38lbs injectors, i have the stock 28s in there now and its not good enough, and i have a mild nitrious cam in there, they said the car is leaning out up top needs more fuel, wut is the best injector u would reccommend?

[Bryan99hoss]

You can get a set of 42's from a LS3/L92 pretty cheap..... but the SVO Fords are going to be the cheapest, also known as green tops = 42, red tops = 36

[BlackY2kZ28]

Originally Posted by Bryan99hoss

You can get a set of 42's from a LS3/L92 pretty cheap..... but the SVO Fords are going to be the cheapest, also known as green tops = 42, red tops = 36

ok cool, how much and where can i find the best deal on the SVO ford ones?

[BlackY2kZ28]

anyone??

[m6speed]

you have a cam only car and they are telling you that you need injectors? find someone that knows what they are doing.
i have a heads/cam car making 450rwhp on motor and a 100 shot on top of that with stock injectors and my duty cycle is just fine, only difference is i have a racetronix fuel pump with hotwire.

[Z/YA]

I would agree with the above, Unless you are spaying you should not be anywhere near maxing out your injectors.

First I would check your fuel filter more then likely I would guess that would be your problem.
Second would be your fuel pump is not keeping up then I would get a Walbro intake pump and take care of that.

Did they hook up a pressure gauge to the car while it was on the dyno to see what the pressure was doing while running it?

Your injectors are not your issue

Oh and if they are your stock injectors they are 26lb in a 2000, unless you swaped them with a 98

[Bryan99hoss]

Originally Posted by Z/YA

Oh and if they are your stock injectors they are 26lb in a 2000, unless you swaped them with a 98

99 is the only year (ls1) they put those 26.6's in a car... 2000/1/2 had the 28.8 just like the 98's did


I dont usually get into the injector comments....

But like they said above I ran 28.8's on a car that made 480rw and it had 150 shot on top of that... and it never went lean until the solenoid hung open.

and I was told by a "Tuner" that you want one pound for every 10 rwhp you make... after he told me you couldnt run 36lb/hr injectors on a motor that probley makes 430rwhp

[BlackY2kZ28]

thank u for the info, i dont know why my tuner is telling me this then, i know the car has a mild cam, and 241 heads on it not sure wut is done to them, all i know is that 5000rpm and above the engine becomes lean, and the duty cycle is 55% over wut it should be so he said the injectors are staying wide open

[Bryan99hoss]

55% over 80% LOL umm

Is this a notable tuner?

[BlackY2kZ28]

Originally Posted by Bryan99hoss

55% over 80% LOL umm

Is this a notable tuner?

yea he did my last ls1 car, i mite be saying it wrong but he def told me the injectors are maxed out up top, and yea fuel filter is brand new btw

[Bryan99hoss]

http://www.ls1tech.com/forums/fuelin...injectors.html

they say 360-400 rwhp is about all they should handle


And I said it wrong they run from 30%-85% effectively... I have seen some people at WOT run 100% which means the injector doesn't pulse

[BlackY2kZ28]

Originally Posted by Bryan99hoss

stock 28.8pound injectors - LS1TECH

they say 360-400 rwhp is about all they should handle


And I said it wrong they run from 30%-85% effectively... I have seen some people at WOT run 100% which means the injector doesn't pulse

gotcha, is it maybe possible that cause i have the 241 heads on the car maybe they are ported and polished, or have work done to them thus needing more fuel up top?

[Bryan99hoss]

doubt that.... the port n polish MIGHT move 30 more cfm than the stockers...



even though I know for a fact 241's can flow 340cfm with the right port/valve

[BlackY2kZ28]

Originally Posted by Bryan99hoss

doubt that.... the port n polish MIGHT move 30 more cfm than the stockers...



even though I know for a fact 241's can flow 340cfm with the right port/valve

ok so that shouldnt make much of a difference then

[Z/YA]

I would hook up a fuel pressure gauge on the rail and run it on the dyno and watch what the pressure is doing in the high RPM range.
I bet your pump is not keeping up if you have already but a new filter on it. I had the same problem with my car. I was going lean up top, stuck a Napa Gold fuel filter on her, got back on the dyno and picked up 70hp!
OK the pick up was 70hp but I think it was mainly the shops dyno was messed up the first time and I told him that but he did not agree with me and instead went online and flamed me when I asked if it was possible for a dyno to be messed up. He won't get anymore of my buisness or any of my friends, Its a long story