How much more power does 24 pound injectors make over stock L98 injectors?

 

Would see no increase. These are near stock size and the ECM will control the fuel flow anyway. Basically a good stock replacement for bad injectors.

 

It would probably cost some power. Most of my injectors are about 6 ounces each. The extra 200 pounds of injector (for eight cylinders) would be a lot of dead weight to drive around.

Seriously, unless you reprogram, your results probably would not be satisfactory.

 

Yep, I've done quite bit of research on this. You'll need minor reprogramming to use 24s. Not that it won't run, but not ideal.

 

I have a question, If you have stock injectors and you reprogram the prom and tell it you have slightly bigger injectors like 24lb for example with that work. or will it still run like crap. I have stock injectors, and in my prom it says 23lb if i change that to 24 will that make it run worse? BTW i belive my injectors are 24lb why is it set to 23lb in my prom. Does these mean if i buy 26lb my prom should be set to 25lb?? thanks

 

Don't think it's that critical. I think I read that the Corvette L98's had 24 lb injectors anyway. Your computer has learning ability to adjust the fuel mixture to some extent that should keep it pretty close to what's needed. With any minor mods, air filters, exhaust, etc. a slightly bigger injector would be better anyway I'd think.

 

I was just wondering. My new engine has 24 pound injectors that are flow matched and the fuel pressure is boosted to 45 pounds. This is supposed to make about 20-25 more horespower. I know Im prolly gonna need a new chip.

 

you think i should bump it out to 24lb in the bin? rather then 23lb?
you are right about the relearning, But i have notice these thirdgens don't really like to relearn as much as say fords do. I wonder if it's make a differance if i change it, i'll have to check my MPG

 

Larger injectors will not give you any more power. The ECM will provide the same amount of fuel for the engine regardless of the injector size (provided you have it set correctly in the prom). Whoever told you that larger injectors will give you 25 hp, didn't know what they were talking about. You will however need to have the injector size changed in the chip. The ECM can only go so far in compensating for a rich mixture.

8UpAFord, alot of times the injector size is set slightly off the actual size. This is because the size is stored in the prom as a hexadecimal value, and isn't precise when you convert it to a useful value. Also, people often "rough in" their tune by adjusting their injector size before they start to work on the fuel tables.

The Corvette L98s had 22 lb injectors, not 24.

You need a larger injector when your engine consumes enough fuel, that your injectors are reaching 80% duty cycle. If you can show me a minor mod that can do that, let me know...

 

cool man thanks that makes sence, i forgot about the hex valves, rounds it off in when converted to Askey i see. thanks for the info.

 

Depending on mods - engines need more fuel,

a head and cam swap along with full exhaust- depending on the size of the cam - could require larger injestors-


LB hr is the flow rate of the injector,

the computer needs to have a constant ( rate) defined so it can compesate, or provide the correct amount of fuel ( pulse width) based on a programmed fuel curve

usually

22lb injectors = 22lb injector constant in the ECM (prom)

upgrade to 24lb injectors = 24lb injector constant in the prom

the 23lb in your prom could be rounded up from 22lbs

and of course the constant in the ecm can be used to fine tune the fueling.

but don't be stupid and put 24lb injectors on a stock prom with a 22lb constant, you can play with your fuel pressure - but that would be a band aid fix. doing this your car would be roughly 10% to rich everywhere, and the stock ecm on a maf really cannot adjust that much to compesate for an injector mismatch - your mileage and perfomance will go into the dump on a stock prom and larger injectors.


example of really needing injectors would be a built 383 with a non- stock intake, a 383 since it is roughly 10% larger than a 350 it needs roughly 10% more fuel- but to keep the duty cycle in a safe range people usually would go to a 30lb injector over a stock 22lb for something like this.. and change the prom to match

Hope it helps, and I didn't confuse you more....

 

nope totally understand thanks