92redhatch

i just wanted to know about how much horsepower it takes to max it 550cc's..

Also how much hp will max out 750cc's.

99B16Si

with a steady normal fuel pressure 550s will hit 100% duty at around 350-375whp
750s will do 450-475whp

92redhatch

ya i have heard that the 550cc's max out at around 400whp. but i guess i was wrong.

99B16Si

depends on the fuel pressure

92redhatch

ok.... so i should use 1000cc's if im planning on making 500whp right?

92redhatch

im tuning my car tomorow with the 550cc's hopefully 350whp, 400whp if im lucky.

cherryhatch00

550's should cover 350..

I mean what, with it being tuned tomorrow.

92redhatch

thats cool im happy with 350whp. we'll see.


BTW what do 1000cc's max at usually? like 700whp?

numbnuts22715

on hondata.com I read that at stock fuel pressure, 550's will make 350 to the flywheel.

njn63

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

92redhatch

so im guessing at a higher fuel pressure i could make 350+whp.

2redstars

i made 349.7 with 550's @ 58psi fuel pressure.

HiProfile

http://www.sdsefi.com/techffhp.htm

That chart follows what I've seen on 'typical' hondas, which is to take the CC of on injector and multiply it by 0.7. So: 550cc x 0.7 = 385whp (at 100% duty cycle). One thing to note about that chart, its most likely thoretical crank HP, but also assumes your FPR doesn't bump up the fuel pressure (unlike a boosted honda).

The key is to find your target HP, then find the CC size that will accomplish that at ~75% duty cycle. Injectors can have issues over 85%, and that extra % gives you room for boost spikes or weird glitches, or even improvements.

Tornadom

I'm assuming the total number of injectors will be four? A single 550cc injector will not support 350whp, and 8 of them should support 700whp... But I am going to guess it is a 4 cylinder motor. I belive 350whp is do able with 4 550cc injectors.

vtec.dc2

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92redhatch &raquo;</TD></TR><TR><TD CLASS="quote">i just wanted to know about how much horsepower it takes to max it 550cc's..

Also how much hp will max out 750cc's. </TD></TR></TABLE>

fuel pressure, a/f and rpm play a role in that as well. high rpm kill the duty cycle. i say to be concervative 550's for under 300

laziebun

if your 550cc arent good wanna trade for 1000cc????

92redhatch

ya if they all work properly and are high impatence saturated injectors. Do they come with the resistor box if so then ill trade right now.

turbodegsi

go with higher ones they can always tune them down..
better to go bigger for later on improvements also but for 350hp
i think 550 would be ok

92redhatch

thanks i agree. i just had the 550cc's lieing around and its better than nothing.

crvtkllr

i have a set of 580 precisions with an resistor box and they only have 1300 miles on them. i just recently found out they max out at about 400 whp and im looking for about 480whp

so who was the one wanting to get rid of the 1000cc.

Fabman

99b16si is a good guy


Modified by Fabman at 2:54 AM 1/19/2007