how much will 750cc or rc770cc make on an h22

well, what i really want to know is will the injectors get me past 500hp on the dyno

 

that's what i run in my build b16. i put down 330whp with no problem. i talked to RC ENG. and they say the 750cc will support 550whp.

 

cool,man

about a month ago, i made 313hp with 8psi on the h22 with 440cc fuel injectors, but they were maxing out at 92%, which is not good.

I just want to make sure im not going to max the 750cc injectors.
I really want to get the Rc1000cc, but i've heard that they produce a rough idle.

 

i maxed out 550cc on a preulde at 12 psi making 335whp. if i were u i would get at least 1000cc's for a prelude. 750cc will max out at high 400whp, close to 500 but i wouldnt run the injectors at such high duty cycle if i were u

 

it all depends on the fuel system along with those size injectors that will make a difference. i have made well over 500hp on rc750's with an intank 255hp pump.

if your goal is 500hp, the 750's are good enough. everybody seems to want 1000's or 1600's and dont really need them.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted k20 &raquo;</TD></TR><TR><TD CLASS="quote">i maxed out 550cc on a preulde at 12 psi making 335whp. if i were u i would get at least 1000cc's for a prelude. 750cc will max out at high 400whp, close to 500 but i wouldnt run the injectors at such high duty cycle if i were u</TD></TR></TABLE>

you should be able to get almost 400hp if not a little more with a higher base fuel pressure out of 550's, 335 seems very very low to max out 550's

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by miller &raquo;</TD></TR><TR><TD CLASS="quote">it all depends on the fuel system along with those size injectors that will make a difference. i have made well over 500hp on rc750's with an intank 255hp pump.

if your goal is 500hp, the 750's are good enough. everybody seems to want 1000's or 1600's and dont really need them.</TD></TR></TABLE>

true, u can make the 500whp if u have a rising rate FPR and have the base pressure set on the high side (50+psi). but u will be on the high side of the injector duty cycle. if the car does decide to overboost one day, the 750cc's will max out and may cause motor failure. im just push n him towards 1000cc's to be on the safe side since his goal is over 500 whp.


and the 550cc injectors was not really maxed out on the 335whp car i.e. 100%. they were around the 85-90% duty cycle range with the a/f running more towards the rich side --&gt; low to flat 11.0:1. i didnt wanna run the injectors to its max

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted k20 &raquo;</TD></TR><TR><TD CLASS="quote">

true, u can make the 500whp if u have a rising rate FPR and have the base pressure set on the high side (50+psi). but u will be on the high side of the injector duty cycle. if the car does decide to overboost one day, the 750cc's will max out and may cause motor failure. im just push n him towards 1000cc's to be on the safe side since his goal is over 500 whp.
</TD></TR></TABLE>

run the base pressure at 65lbs

i would say 880's max. i still dont think he needs more then 750's for 500-550hp.


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted k20 &raquo;</TD></TR><TR><TD CLASS="quote">

and the 550cc injectors was not really maxed out on the 335whp car i.e. 100%. they were around the 85-90% duty cycle range with the a/f running more towards the rich side --&gt; low to flat 11.0:1. i didnt wanna run the injectors to its max </TD></TR></TABLE>

well i consider 85-90% maxxed out myself, but it still seems a little down on power for that much fuel. im gonna say you are being very very conservative with the timing.




Modified by miller at 2:21 AM 6/16/2006

 

Sorry, guys

I meant to say that i maxed out the 440cc injectors 92% at 312hp, not 550cc.

anyways, the tuner raised the fuel pressure and managed to lower the load on the fuel injectors. So, is it true that 1000cc give a rough idle?

keep the info coming

 

By the way, the set-up is equipped with a aftermarket warlboro pump

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by peakboosth22 &raquo;</TD></TR><TR><TD CLASS="quote">Sorry, guys

I meant to say that i maxed out the 440cc injectors 92% at 312hp, not 550cc.

anyways, the tuner raised the fuel pressure and managed to lower the load on the fuel injectors. So, is it true that 1000cc give a rough idle?

keep the info coming </TD></TR></TABLE>

it isnt really a rough idle. i have 1200's in my hatch, yes the iac duty is about 100%, and the afr's are 11-13 range,(threw the map together for e-town) but it is like this, you can only open an injector with so little a pulse width. so the larger injectors are gonna be a little fatter at idle. plenty of people are idling 1000's fine. it is all in how much time you put into your map. i have a friend that had 1600's in his hatch and it idled ok. not stellar but ok for traffic and driving around. i am about 540 +- on a walbro right now. it is time for a big external because it has been in there for 5 years now, but you should be able to reach your goal with the walbro. also i have found that bigger injectors, 1000's + actually like a higher base f.p. and seem to idle better because of the better atomization of the fuel with the higher pressure.

ps yo miller, i am determined to drill gsr front rotors to fit my spindles. still waiting on the axle and turbo, but both are getting fixed under warranty

 

yo, man

thanks for the info. I think that I will benefit more with the 1000cc fuel injector rather than the 750cc over the long haul. i'll probably buy the RC1000cc only because they are so compatilbe with my s200 hondata program.

 

I would go with the saturated 1000's...Maxed 750's out at 471whp, but base fp was only ~40psi. We were revving the motor over 9k though..not sure how high your taking the h22..

 

My Precision 780s were at about 63% on my 400WHP pull.

 

should have everything you need to figure out what size injector you need.


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

platinum

 

wow, thats pretty good.

would it be safe to assume that at just over 500hp the injectors would be running at plus 80% on the H series