Is there some sort of online calculator to see which injectors max out at what power output? For example what do 335cc's max out at?

 

www.stealth316.com has one in the technical section. The RC injector homesite does as well I believe.

 

Its just a guideline and varies a little depending on other factors.

Horsepower x B.S.F.C (IIRC, estimated at 0.5 for N/A applications)
divided by
# of Injectors x 0.80 (80% duty cycle)

http://www.rceng.com/technical.htm

remember the cc to min conversion by multiplying 10.50 to the result for cc/min

If i'm doing this correctly....
335cc's converted to lbs/hr = 31.90 (335 divided by 10.5)

Y horsepower (x) 0.5 divided by 4.80 (6 x 0.80) = 31.90
0.5Y divided by 4.80 = 31.90
0.5Y = 153.12 (31.9 x 4.8)
Y= 306.24 hp (153.12 divided by 0.5)

 

Weird... I would have expected more than 30x hp considering Z guys run near 300whp n/a on stock injectors

 

there arent that many 300whp z's that i could find.from my understanding its very hard for them. (with jus bolt-ons and stock internals)

 

Regardless, the ones that get there are still running stock injectors (335cc), making maybe 350 HP at the crank.

 

Are they raising fuel rail pressure with an FMU? Inputting different fuel pressures will yeild different HPs ceilings.

 

I'm almost certain they are using stock 3.5 Bar fuel pressure... I doubt anybody would want to raise it any higher.

 

what do you mean their are not many. I made 241whp and 340wtp on 259cc at 90% duty cycle. And you can make up to about 450whp on stock internals with a good tune but not stock injectors for sure

 

The calculation doesn't take into effect fuel pressure and other variables such as compression ratio, timing, etc

 

So does anyone have a good guess what 370cc injectors max out at?

 

jdmmax with SC had 370cc injectors and was maxing out at around 250-270 whp because his MAF was maxing out. He's now changed to a 300zx MAF but hasn't dynoed since.

You could probably try snooping around here and the dyno forum to read up on different setups. A lot of boosted 4th gens are using the 370cc injectors

I think a safe assumption with the calculation above would be around 300 whp. The BSFC changes with boosted applications

 

there aren't that many 350z's n/a pushing over 300whp.atleast I couldnt find them.