tune my car on hondata and tuner were only able to make 400hp. injectors were about max out

 

Hmmm. What duty cycle were they at when u made 400hp? There should be some more room left on those injectors. Peak n hold or saturated?

 

well dsport has a chart in one of there mags and it say at 80% duty cycle 1000cc should make around 500whp if there chart is correct somethings not right

 

i would thing you can make way more than 500whp with 1000cc injectors.....someone correct me if im wrong......

 

duty cycle were around high 80's. these are peak on hold injectors.

 

what brand injectors were these? Id be curious to see what happened if you bumped your pressure up to around 50psi.

on the same note, how much pressure you guys running on 1000cc injectors?

 

Ive seen a 710whp pass on 1000cc presicion injectors, fuel pressure was set to 45psi I believe

Your tuner must have made a mistake with your tune

Im 300+ with my 450cc's and they are maxed out. 600+ shouldnt be a problem to ANYONE with 1000'cc

 

im making 435 whp on 1000cc's and am at 65% duty cycle @ 45 psi fuel

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by eg:R &raquo;</TD></TR><TR><TD CLASS="quote">tune my car on hondata and tuner were only able to make 400hp. injectors were about max out</TD></TR></TABLE>

you've got some issues there, a serious non effecient engine or poor tuning. my friends car was making 425whp on 750's with 76% duty cycle

Are you having a fuel pump issue, is it not keeping up and that why your maxing the injectors????

 

every thing is new in the car. the car was dyno on a dyno jet if that matter. i don't want to get any bigger injectors. will fuel rail matter?? im still running a stock one.

 

Not once in this thread did i see him mention what fuel pump he is running. I would be willing to bet that the pump isn't keeping up with what the injectors need. What pump are you running? Is it holding fuel pressure?

Precision rates their 1000cc injects at 171hp per injector at 43.5psi. Just using the numbers they should go to 684hp (flywheel) in this situation. But those are just going by the numbers and many other factors are envolved in each situation.

HP / Number of Injectors x BSFC / Duty Cycle = size you should use
To convert lbs/hr to cc's, multiply by 10.2. To convert cc's to lbs/hr, divide by 10.2.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RTW DC2R &raquo;</TD></TR><TR><TD CLASS="quote">what brand injectors were these? Id be curious to see what happened if you bumped your pressure up to around 50psi.

on the same note, how much pressure you guys running on 1000cc injectors?</TD></TR></TABLE>

these are precision 1000cc peak/hold. im sure i can bump more hp if i adjust the fuel pressure to 50psi. but you would think that i wouldn't have to.

using 255lph fuel pump

 

If its maxxed out you could try more pressure. What pump are you using? Stock rail, Id probably get rid of that but I dont know what the limitation is for it. My 1000cc precisions are only at 60% duty with similar power, but that was around 50psi fuel pressure.

something is not right somewhere

 

edit, nm, just read it, lol

 

using a 255lph, is everybody here using aftermarket fuel rail?

 

Make sure you rewire the pump and use an aftermarket rail. The stock one restrict alot

Adriano

 

rewire? I didnt do any rewiring of my pump in order to use the aftermarket rail.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RTW DC2R &raquo;</TD></TR><TR><TD CLASS="quote">rewire? I didnt do any rewiring of my pump in order to use the aftermarket rail. </TD></TR></TABLE>

He ment do both. Rewire the larger pump with larger gauge wire so its gets enough juice, and in addition run an aftermarket fuel rail.

 

first time Ive heard that

 

Not the first time I heard of it, its quite common.

 

so essentially you guys are saying that the 255 might not get enough power with the stock wiring? and that some/many of you rewire it with another gauge of wire? where would you run the wire from? what source?

 

ive heard of it too

dsm guys are doin it all the time

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by eg:R &raquo;</TD></TR><TR><TD CLASS="quote">tune my car on hondata and tuner were only able to make 400hp. injectors were about max out</TD></TR></TABLE>
something is wrong with your fuel system

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RTW DC2R &raquo;</TD></TR><TR><TD CLASS="quote">so essentially you guys are saying that the 255 might not get enough power with the stock wiring? and that some/many of you rewire it with another gauge of wire? where would you run the wire from? what source?</TD></TR></TABLE>

I'd say from the battery to a seperate relay triggered by the stock signal wire. I've seen it done this way. Kind of like wiring an amp for a stereo. I'm sure there are other ways but that is one I have seen.

 

im not to sure if this is just my car, the dyno or the tuner. i have heard other cars that dyno there came up to the same problem i have also. 750cc max out at 300hp and others that are similar. will this be the tuner