750cc inj's on 14b

[91-gsx]

i have 750cc injectors RC's, on a 14b running 18 psi, is there any way i could max the injectors out, becuase my logger is showing that i am at 87% at times, anything wrong here?

 

[1992eclipse]

Lots of things wrong but not what your asking about. Take those injectors out, they are way to big for a 14b

 

[91-gsx]

any other ideas?

 

[sweet97]

Don't you have an EPROM with injector compensation? Back off the boost to 15psi. 87% is not maxed out but 18psi on the stock smic is too much IMHO. Mark

 

[SpoOLxExO]

Theres no way you could max out 750cc injectors with a turbo that *only puts out 30-32lbs/min like the 14b.

Like sweet97 says, @ 18psi the stock intercooler is heatsoaked and loosing more power from the heatsoak then 3 less psi you would get with 15psi. This seems to be the most efficient boost level on a 14b w/o FMIC.

Besides "87% at times" is a vague statement. Do you have any logs you could post?

 

[91-gsx]

im trying to figure out how i could get my logs on to my computer sense i am using mmcd. it was i believe 87% injd at 7,138 rpms. so it was at redline but still, i though it was not possible to even get near that with a 14b, i thought somewhere like 60 something% injd. what i could always do is lean out the mixture and compensate with more fuel pressure.

 

[L2RTSiAWD]

Maybe the injectors are getting clogged. I would send them to get cleaned and flow tested. Swap in a set of stockers and check your IDC>

 

[94awdcoupe]

there is absolutely no reason why you should have any size injectors bigger then 550s for a 14b. why did you put them in there for? have you read the VFAQ on modding a car? its there because it works. follow the order and you will be fine.

 

[SpoOLxExO]

Theres no reason to harp on the guy just cause he has dope injectors, and can't find out why they are acting up. Maybe they are used and are clogged like LR2 said.

Either way your comment was erroneous, because on a 14b the best way to make power is with timing, and not so much boost.

Taking the nessisary fuel out (Around 30% or so) on a fuel controller in order to run 750's will trick the ecu into giving up more timing.

So actually 750's are nicer than 550's in this insance. but to each his own.

Hey 91-GSX.

Are those RC's Used or what?
Hows your fuel filter?
What kind of pump do you have again?

 

[91-gsx]

they are brand new and they came with a flow chart when i bought them about a month ago, it is not the injectors because it was working better when i had it running leaner. it would knock, but like 6 times in the high rpms. replaced the fuel filter about 1 1/2 months ago, and i have a fpr along with a 255lph walbro. i did all that i could to make sure the car was in good shape before i went along and started modding it, like timing belt and all. i think the main problem might be the boost is too high for the stock intercooler, it is nice seeing that needle go up to 18 psi but if i am losing power then 15 psi it is. maybe i knock and cannot leanit out at higher and mid rpms becuase the air that the turbo is too hot. and i have a chip programed for 750cc injectors so i can use them on any turbo i want.
thank you for the replies

 

[91-gsx]

i also have a spearco intercooler that is going to be going in very soon just bought piping for it and all.

 

[SpoOLxExO]

Thats what we like to hear!

Oh yeah! It just occured to me, you live in Cali. What kind of gas does that thing sip?

On a side note, is 91 the best fuel you guys out there can get? Or is it just the price?

 

[91-gsx]

91 is what we have at evry gas station and that cost me just yesterday $2.77 a gallon. i know of a 76 that sells 100 octane but it runs for almost $5, man i would love to see what boost, timing and mixture i can run on 100, but by the time i have it tuned for that i would have lost one tank of gas. that is why soon enough, alcohol injection will be the next best thing, heard it is like running race gas on the streets.

 

[ihatedsms]

it will probably run wayyy better with 450s thats all you need on a 14b! there plenty of people who go low 12s on the 14b with stock injectors.. 750s is wayyy overkill, even tho you have the chip for it, i guarenteeee if you take out that chip and injectors, that it will run way better.. the chip and injectors are nice but not for a 14b

 

[Coup D E'Tat]

there is absolutely no reason why you should have any size injectors bigger then 550s for a 14b. why did you put them in there for? have you read the VFAQ on modding a car? its there because it works. follow the order and you will be fine.

I wouldn't say that. My friend maxed his out on a 14b, FP2 cams, etc., on 550's and pump gas.

 

[94awdcoupe]

I wouldn't say that. My friend maxed his out on a 14b, FP2 cams, etc., on 550's and pump gas.

i tried maxing out my 550s with 264/264 and other bolt ons w/25 psi and still couldnt max them out. i had a 255, AFPR, rewire, and AFC and never had a problem. i had the 550s doing 81% IDC and that was the highest. fuel pressure at 49lbs and never had a problem. o well, to each is own!

me personally, i think its overkill.

 

[KlowdDragon]

i tried maxing out my 550s with 264/264 and other bolt ons w/25 psi and still couldnt max them out. i had a 255, AFPR, rewire, and AFC and never had a problem. i had the 550s doing 81% IDC and that was the highest. fuel pressure at 49lbs and never had a problem. o well, to each is own!

me personally, i think its overkill.

each setup can be react differently, if the intake and exhaust is taken car of, all the fuel system is done (including the fuel filter, may seem small but its one of the biggest fuel restrictions in a dsm), running some aftermarket cams, it should be no problem maxing out 550's. You should be aiming more at maxing 660's, that would be harder to do, I think that might be a little to much for the 14b to max. But yea, i've seen people running 880's with 14b's with no problems. As long as you can tune to compensate, ain't nothing bad.