cant find anything on this subject. i have a b18b and i know the stock injectors and rail are only good up to a certain amount of hp, but does anyone know what that number is?

 

turbo or NA? stock injectors are good for maybe 200whp?? rail is good to 4-500whp

 

Here is a calculator to help you out, its at the bottom. Read the notes regarding the brake specific fuel pressure.
http://www.rceng.com/technical.aspx

 

fixed

 

im running n/a. i want to keep this engine street and smog legal so im lookin for some power but not too aggressive. and i think 200whp is good enough for me

 

Thanks

 

can anyone confirm what dpetro stated?

 

hmm, i actually might adjust my estimate down some. i looked through a bunch of dyno sheets on the evans tuning site, most 200whp builds had a least 310cc injectors. i did see a 186whp itr w/ stock injectors and i believe a 192whp ls/vtec w/ stock injectors.

maybe tuner with some NA experience can chime in

 

ya they are all 240cc i read somewhere. ill probably just use the stock stuff until i cant anymore.

 

crank up the base fuel to 90 lbs and theyll flow 330cc's give or take. not sure how well but theyll flow more.

 

as in chip the ecu to run more fuel?

 

no. an aftermarket fpr instead of an oem fpr. you can adjust the base fuel. itll raise the pressure to flow more then 240cc at 42 psi. instead it would be 330cc +/- at 90 psi so to speak. that is, if you have the fuel pump to do that.

 

can i run bigger injectors without upgrading the fuel pump and rail, etc?

 

yea, but the stock pump can only handle so much, rail is good to 750ish tho. a friends car has had the oem rail and oem fpr for years, full tilt it make 754 last time on the dyno.

 

my setup is a ported ls head, valve job, crane cams and valvetrain. probably blox IM and TB. so does it look like i can run all the factory fuel components?

 

most likely yes. maybe bigger injectors depending on your hp goal. what whp are you shooting for? i assume you might be around 170whp on a non-vtec motor with those mods

 

ya thats about what im goin for. a streetable mild build

 

.

 

ok...

 

what about when it comes down to tuning?