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Maxing out stock injectors? but don't think i should be.....

B

blackgrandprix

New member
hey i have a 2007 grand prix gt with s1x, cam, oer lifters yella terra rockers, 105 springs and modded retainers, 3.5 pulley, headers 3" down pipe, plugs and t stat and intake ect, and hp tuners and well at about 5100 rpm i reach 100% injectors duty and 23ms pulse all the way to about 136% and 25-26ms at about 6000-6400 rpm. with about 6kr at the 5100+ range. so what i wana know is do i need new injectors or should i start looking at fuel pump and its gay filter in the tank for the 07 if new injectors what should i got with i plan on doing more mods down the road. thanks.
 


blackgrandprix said:
hey i have a 2007 grand prix gt with s1x, cam, oer lifters yella terra rockers, 105 springs and modded retainers, 3.5 pulley, headers 3" down pipe, plugs and t stat and intake ect, and hp tuners and well at about 5100 rpm i reach 100% injectors duty and 23ms pulse all the way to about 136% and 25-26ms at about 6000-6400 rpm. with about 6kr at the 5100+ range. so what i wana know is do i need new injectors or should i start looking at fuel pump and its gay filter in the tank for the 07 if new injectors what should i got with i plan on doing more mods down the road. thanks.
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42# injectors are what most of us do as our first injector upgrade. Did you do the fp rewire? Injector size would depend on your future plans for your car bro.:)
 
im surprised you shouldnt be running out of injector yet...what are your other mods..and if you dont have a furl pump rewire, i recomend one from racetronix...
 
Keep in mind he also has a gen V. You will max out stock injectors below a 3.1 on a gen 3. On a gen 5 I believe you will max them at a 3.3 - 3.4 depending on the setup.
 


depends on your tune and how much fuel you need to dump to quelch the knock for your pulley that is or is not too small.
 
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