mjr46

you don't have 400 hp with that set up, which are why 19's work for you, try 19's on a real 400 hp combo and show the duty cycle with an a/f slip as proof on the dyno to support the claim.

Ecstasy

Actually you don't have any idea how much hp I have because you don't know anything about my block or what supporting mods I have. I know for a fact as well as two dyno places to back up my claims that 19# injectors work fine up to 400hp, and I've seen them work past if you upgrade the fuel pump with an adj. fuel press reg. Next time you want to say something, you may want to find out your facts first.

mjr46

time and time again I explain this....do you know what the GFUB DOC. is for the eec iv?? probably not, adding a bigger fuel pump and adj reg will do nothing, the eec iv strategy has adaptive learning to a degree of +/- 11-13 % while an adj reg and bumping the fp up would work on WOT/OPEN loop strategy, the ecc iv in closed loop operation will know you bumped fp and sense the rich condition and trim inj pulse to get back to stoch. mix......unless you bypass the closed loop strategy....via tunning turning a screw does nothing in the big picture except on wot/open loop, IF IT WERE A PURE RACE CAR FINE, BUT NOT PRACTICAL ON A DUAL PURPOSE CAR, oops caps again..lol DO the fuel system right and no worries will be needed, and I do have my facts straight and data logs and dyno pull sheets as well as GFUB. DOC as proof........you can argue with engineering of the eec iv all you want, but unless you know how it's wired don't make blanket statements, thank you.

dawson1112

19# injectors as a (rule of thumb) on a N/A car @ 85% duty cycle are good for right around 260hp . To reach 400 hp you would need to have 30# injectors and run them at right around 85% duty cycle.
85% duty cycle is about the most you want to push your injectors or they start to float half open and lean out the a/f if you start going close to the 100% mark.
Even if you did tune the adaptive learning of the ecm a/f mix out or keep it in open loop running your injectors at 100% duty is not worth the damage you could cause .

Venomantidote95

Well your 2 dyno shops and your misinformation are leading you in the wrong direction!
And without a power adder and a healthy one at that you ARENT close to 400hp not even at that crank....

You could get enough fuel from about 50lbs of fuel pressure with 19`s but it wouldnt idle worth a **** without a tune and the injectors still wouldnt last long at that rate!

nitrous_bob

1) 19 lbers WILL NOT support 400 hp, but 24 lbers will, and thats with a 190 pump
2) why did you take your 24 lbers out and replace them with 19's ?
3) your dyno guys are retarded and i wouldnt go there anymore for ANYTHING

89LX Coupe

OP with that set up I personally would go with a fuel pressure regulator and turn it up to 40-42psi. If you would feel more comfortable with a bigger injector then just go 24#. With both set ups in my sig I was running 19# injectors with a regulator. With my bolt on set up I had the fuel pressure set at 40psi with the a/f ratio right at 12.5 and the heads and intake set up I had the pressure set at 43-44psi with the a/f ratio right at 12.7-12.8.

mattdel

This place is always good for a chuckle. Bob referring to nitrous as smack had me rollin. hahhahaha