Rb20det Injector size for hp....370cc good for 250-280WHP??

[blues14]

Just like the post says....are 370cc injectors good for 250-280whp on an rb20det?? I would of course like to run 70-85 duty cycle, I know everybody loves 550cc's, but that really seems like overkill on a motor making less than 300 whp.

[Suicide.Veteran]

Well,

each 370cc injector is good for 74 hp on 100% duty cycle. This is derived from Injector HP=cc/min / 5

and 74hp x 6 injectors = 444hp at 100% duty cycle

so 70% of 444hp is 310hp. 85% is 377hp

I would personally not go over 75% duty cycle daily driving tho.

[Carl H]

suicide has it down pat.370's are useless honestly, and 440's arnt much better...550's will allow for good headroom.i run 720's in my car for that reason, low duty cycles.

[HxC_Nismo]

i have some r33 rb26 444cc top feed injectors for you motor $200 obo let me know email [email protected]

[blues14]

is there such thing as too low of duty cylce?? I am planning to go with injectors from Deutchwerks....they all cost about the same, so price isnt an issue.

[Carl H]

low duty cycle is ideal, but you can have too large and have trouble tuning.i would shoot for atleast 50% daily driving but no more than 80% in full power mode.it doesnt make sense to slap on 800cc injectors on a car that wont make more than 250whp...nor does it make sense to run 440's on a car that will make 400whp.we put some 550's on a friends stock rb20 and tuned it for those injectors, car starts on a dime, idles perfectly, gets 25mpg (assuming he doesnt a$$ around), and gives him the fuel he needs for his eventual 350whp goal.just like maf sensors the larger you go the less fine resolution you have, something to keep in mind.