alright so my question is i have a h2b using qsd kit h22a with b16 trans , skunk2 manifold with 70mm skunk2 throttle body and stock fuel rail stock fuel reg. i converted the injectors to obd2 style and took out the h22a 345cc injectors and traded for a set of of obd2 h22a4 injectors 290cc and iam bout to go get the car tuned and im not sure if i should keep these 290cc instead of the 345cc .... idk what i should do i was told by a few people that 290cc injectors on a stock internal h22a is ok any you guys out there PLEASE put in your comments and expereince with your h2b set ups . thanks

 

also if i go with the 345cc should i get a bigger fuel pump

 

please help

 

yes keep the 345cc and get a bigger fuel pump.. not necessary but if u want better dyno numbers, it'll help

 

its needed even tho its all stock internals just bolt-ons ??

 

are you planning on making more power later? I would put in the bigger set of injectors just to leave room for future mods and let the injectors work less hard.

 

btw I just used one of those "injector calculators" and you could only get 210 FLYWHEEL horsepower with 345cc injectors at 80% duty cycle. That's a guideline for you

 

alright cool thanks man so 440cc is prob best idea then can u check the chart for 440cc please and thanks you alot. and for now i just plan on keeping it bolt ons header.intake manifols blah blah

 

You shouldn't need a bigger fuel pump for only bolt-ons. There are also plenty of people running bolt-ons with the stock injectors. That S2 IM is not doing you any favors with stock cams and no headwork. If that and the TB is your only mod, you don't need new injectors right now. When you do get new injectors, look into Injector Dynamics (ie ID800's or ID1000's) or similar.

 

That is all dependent on BSFC and what values you put in the calculator. The JDM Prelude Type-S is 220bhp with 290cc injectors and the F20C/F22C out of the S2k is 240bhp on 370's...

 

listen to him, just keep the 345cc with your stock fuel pump, you'll have no problems.

 

i have 290cc injectors now guys i got them with the manifold the manifold came off a h22a4 motor and i only got the s2 manifold was cause i got my motor with no manifold...

 

The 290cc injectors are fine man. I made 240 hp before i maxed them out with a stock fuel pump on my car car. I ran them for years on several 230hp motors my tuner had no problems. Nothing wrong with having the bigger injectors for later on but im guessing you dont want to wire up a resistor box right now so you will be fine with what you have.

 

Exactly I switch to the h22a4 injectors because I didn't want to **** with the resistor box and all and at the time I didn't knw h series jdm motors have bigger injectors . Anyways good to hear 290cc r good i have been stressing it thinking I should jus get some 440 and call it aday ,,,,,, f20b Jones what was ur set up with the 290cc's ? Did u do the same thing I did switch from the 345cc to the 290cc's or did u hav a h22a4 ??

 

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stay with the obd2 and see what happens. if you get maxeed out then just get a Fuel pressure or swap to diff injectors

 

Ya