right now i have a set of rc 550 cc's. I want to keep the injectors at about a 80% duty cycle. The motor is a b16 on a 57 trim turbo with forged internals. i want to make from 350 to 450 whp. I know i have to change the 550's so what size would be just right for this horsepower number?

thanx

 

750cc

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92redhatch &raquo;</TD></TR><TR><TD CLASS="quote"> I want to keep the injectors at about a 80% duty cycle. </TD></TR></TABLE>

curious on why? why not just get 1000's/96lbers and not worry about it

you know how boost is addictive

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Muckman &raquo;</TD></TR><TR><TD CLASS="quote">750cc</TD></TR></TABLE>

 

nah 1000cc injectors are over doing it. Its a stock sleeve b16a2 i dont want to push more then 450whp. its my daily driver. and daily driven it will only be on 6 psi.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92redhatch &raquo;</TD></TR><TR><TD CLASS="quote">nah 1000cc injectors are over doing it. Its a stock sleeve b16a2 i dont want to push more then 450whp. its my daily driver. and daily driven it will only be on 6 psi.</TD></TR></TABLE>

how your gonna run 6psi daily and make 450whp.. swap out the WG springs whenever? I doubt you will make 450 on 12psi.

Anyways.. 750's should do it, 780's is what im running.

 

id say 750's but i do have a set of PTE 1000's forsale only have about 500 miles on them $250 PM me if interested

 

750s are nice because its the biggest size you can get from RC thats saturated (OBD2) so you dont need to wire up a lame resistor box.

 

i forgot to add i have a turbo xs boost controller. Im not trying to make 450whp on 6 psi. 6 psi i should make like 220whp. on about 20 psi i should be pretty close to the 400whp range if not past it. High boost is only for track days. What power should i see with the 550cc's at 80% duty cycle? like 300whp?

 

750 will be enough


i got 1000cc at 420hp its at 60ish%

 

ya thats what i thought that 750cc's would be just about right for my setup and horsepower goals. Now the question is what horsepower will the 550cc's make at 80% duty cycle? Im guessing around 300whp.

 

Ive personally seen 550s max out at 341whp at a low fuel pressure.. (base of 35psi). I think you could get 350 out of them safely.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92redhatch &raquo;</TD></TR><TR><TD CLASS="quote">ya thats what i thought that 750cc's would be just about right for my setup and horsepower goals. Now the question is what horsepower will the 550cc's make at 80% duty cycle? Im guessing around 300whp.</TD></TR></TABLE>

I have maxed 440's out at 100% duty cycle at 317whp on a dyno jet. The last set of 750cc's I maxed at 100% was at 470whp. I don't recall working with too many 550cc set-ups... but I think at 80% duty cycle will net you around 340-360whp with stock fuel pressure.

Anyways, go with 750's as everyone else has already said.

 

&lt; -- 400whp 440cc injectors

lots of fuel pressure.

 

Why not just get the 1000 cc's in case you end up building down the road? isn't the price difference pretty small?

 

because i want an 80% duty cycle to ensure that i have a really good spray patern. And if i do build another block later on it will be years down the road so theres no point in having the 1000's.

 

not trying to jack your thread and I can delete this if you like, but does anybody want to chime in on 1000's? would there be any problem running 1000's at 300-400whp? Would it really be beneficial to use 750's?

 

how about a compromise at 880cc....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PA MATT &raquo;</TD></TR><TR><TD CLASS="quote">not trying to jack your thread and I can delete this if you like, but does anybody want to chime in on 1000's? would there be any problem running 1000's at 300-400whp? Would it really be beneficial to use 750's? </TD></TR></TABLE>

yeah, i wanna know also

 

the spray pattern. At 80% the injector has a great spray patern. at 100% the spray pattern sux. and anything under 75% the spray pattern isnt so good either.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Schister66 &raquo;</TD></TR><TR><TD CLASS="quote">how about a compromise at 880cc....</TD></TR></TABLE>

thats what i was going to say...i thing 880's would be best.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Muckman &raquo;</TD></TR><TR><TD CLASS="quote">750cc</TD></TR></TABLE>