ok, i have a dilemma. i'm not sure if i need a rrfpr to run 5 psi of boost on my tib. using the injector calculator on rc engineering's website, i figured for 140hp, using 4 injectors, with .45 bsfc, .68 duty cycle, and 43.9 psi fuel pressure, i would need 245 injectors. i was just trying to establish a baseline. i picked up the .67 duty cycle from talking to shadohh. he said it was around .6, but didn't know for sure, so don't bash him if i misquoted him or whatever. so, for 190 hp, i'm not sure what psi this is, i would need 282cc fuel injectors at .8 duty cycle at 43.9 psi. basically, is this feasible with an e-manage, or other piggy back fuel computer, or do i need more fuel pressure, hence the rrfpr? i remember reading that my injectors top out at 7 psi. i don't know what hp this is producing at the crank. so, is e-manage sufficient, or do i need a rrfpr? and, if i want more than 7psi (let's assume i'm staying with 245cc injectors), will i then need a rrfpr? i know that if i go with 440cc, then i won't need more fuel pressure, and that the e-manage will suffice for providing a longer pulse width. please only reply if you are very knowledgeable, or have experience with this.

also, what hp and tq is the stock tib clutch rated for? like i said, i would like to run 5 psi, initially. i'm going to keep this a daily driver, and 5psi will provide enough fun for 1 1/2 years until i'm out of school. also, while i'm on it, what kinda hp will 5 psi provide? is the relationship between psi and hp gains linear? like 1 psi of boost = 10hp? or something like that?

[ January 08, 2003, 10:48 PM: Message edited by: turbulence ]

 

back for a spell.

Can you please post up the following so we can try to help you more:

-Turbine you intend to use or are using(please include any changes of parts or modifications to the turbine ie. front housing, housing match, porting, thermal coating etc.)
-Any further modifications to the intake and exhaust stream inclding downpipe measurements(if you have one on already, whatever else may be added to your profile)
-What other modification you intend to perform(might as well make the system feasible for further tuning and kill 2 birds with one stone while we're at it.)

We'll need to get even more specific, and try to work out wat we can do for your system from there. This convo can be used as part of your planning for your personal tuning process if you can supply the information.

 

i'm using a t3 turbo. i don't have anyother measurements or specs to give you. the downpipe *might* be the cnk one. one of the reasons i made this post was that i realize i may not need more fuel pressure now, but i'm looking to the future, as well. however, i still may not need more fuel pressure, as if get larger (440cc) injectors, they would provide enough fuel at 43.9psi.

 

how much power are you for with the final product?

 

You stock clutch will not last the 1.5 years

at 185whp... my stock clutch lasted about... half a year

this is with continuous bottle spraying...

 

the 5psi he wants to run i feel would yield him abotu 160crank hp.

 

how will 5psi on stock compression only yield about 160 crank hp, a 20hp increase over stock, when the cnk kit yields about 280-300 crank hp with 7-8 psi on lowered compression? right now, this is what i want to do with my turbo:

use stock compresion
use stock injectors
possibly use stock clutch, although it doesn't look like i can.

i want the max power out of this, without making my injectors go static or putting too much strain on them. so, i've read on the board that i can go 7 psi on stock inj and compression, but what duty cycle is that on the inj? i don't want to go above 85%.

using the rc engineering calculator:

190 crank hp
4 inj
.6 fuel consumption
85% duty cycle
43.9 psi fuel pressure
yields the necessity for 354cc injectors. i don't see how i would get that kind of flow out of the stock injectors unless i raise fuel pressure, or just get larger injectors.

 

Ummm, No way in hell is make 300hp crank on 7-8 WITH LOW COMP PISTONS.

No way in hell.

Might I also add you are figuring 190crank.

Thats closer to 9psi.

which yes, you need new injectors.

Again, increasing injector pressure will put more strain on them then say taking injector duty up to 90%.

[ January 09, 2003, 01:15 PM: Message edited by: Shadohh ]