Nismo-san

Any body know what size of injectors would i need for 5psi of boost on a soon to be turbo'd SR20DE nissan..... in addition....does anybody have any other setup suggestions like timing, fuel pumps, etc....

Thanks

RobertPadron

First off 5 psi aint squat, 10 psi is where you should be. As far as fuel management, I'd go with dsm 450 injectors off the turbo eclipse stick shift and a vafc. Also, what turbo are you going to be using? Once again 5psi aint jack. :1

seerex

Ok you need to do more home work ie read and read. I have some s13 injectors that would work, its your 55 shipped. The vafc is good, but soon Chris will be chiping Nissan ecu's.

fe3tcourier

sr that i have seen are sidefeed, dsm are top feed.

ms for management, and like the other dude said, read read read...

on 5psi you might make 200hp crank 250 on 10. if its stock na high comp, you better run good gas if you boost at 10psi. injector sizing can be worked out from power output. the most you are likely to make on 5psi with lots of mods is about 266hp, but thats so unlikely it wasnt worth typing really.

i'll get you started you lazy prat :
http://www.megamanual.com/v22manual/mfuel.htm
http://www.google.co.nz/search?hl=en...ing%20ms&meta=

Hitchhikkr

Im pretty sure chipping nissan ecu's is CHEAPER than the ms. Probably easier to tune as well because ppl have been doing it for quite some time. What your suggesting is the equivlent of putting a standalone on an OBDI honda.

Um just out of curiousity, he didnt state what turbo/setup he's using. Your spouting out hp numbers like youve built his engine already. Kind of contradicts the attitude you present in every other post youve made. I think you would know by now that 5psi on a t25 isnt the same as the power youd make on a gt35r. Just calling it like I see it.

fe3tcourier

i would be the sort to do that, and i wouldnt be the first :

http://www.msruns.com/viewforum.php?f=94

nope, i'm spouting out ball park example numbers that would be pretty close to the truth regardless of which turbo etc you choose assuming he has stock cams and compression.

lets look at what things affect power at x psi with regards different turbos :

sizing : if it cant pump 200hp worth of air at 5psi then its going to be horribly inefficient, and its going to be hot super heated air. you could still intercool it and hook the wastegate to the manifold instead of the compressor outlet to make sure you see your 5psi. if you did these things and the turbo could just manage those psi, you'd get close to your power till it blew up from excessive shaft rpm.

efficiency : assuming non intercooled setup, you will get more hp when your 5psi at peak power is in the middle of the island ie is coolest and most dense. if you pump 5psi with that gt35r, its not efficient, but, it will score well on the next point :

back pressure to the exhaust ports : the big turbo wont present much to the engine, and scavenging (if there is any) will be better, and residual exhaust left in the cylinder displacing perfectly good air/fuel will be less. the small turbo will have more back pressure and thus leave more burnt crap in the chamber taking up space the air would be better off in.

basically if its intercooled and he pushes 5psi and the turbo is even close to correctly sized, it'll be around that sort of hp mark.

so, now that thats out of the way, 200hp at the crank is fairly realistic from a bone stock sr20 with a t25 t28 gt35 etc strapped to it, and he can then use the links provided to figure out that he needs 300cc/min or preferably higher injectors to make that power. (thats at 100% duty) if he were smart, hed think about making 15psi in the future and buy 450s or 550s instead so he wouldnt have to do it all again later.

i thought it was obvious that they were example figures, but i guess you are right, noobs tend to read ---- as gospel all the time.

sorry for that. should be clear as crystal now.

Nismo-san

Yeah my bad.....heres where everything gets turned upside down.....call me what u want but here goes....

1993 sentra SE-R, SR20DE

REMOTE MOUNT (REAR) TDO4h mitsu Turbo

Eclipse side mount IC
1g BOV

This is a little side project im doing for myself...i'm asumming that i probably not going to get much boost at all, maybe around or just over 5psi.....i know the regular turbo setups are more effective but i feel like trying something different.......does anyone think that more boost is achieveable with that small blower?

fe3tcourier

http://www.stealth316.com/images/td04-13g-jlspec.gif
http://www.stealth316.com/images/td04-15g-jlspec.gif

at 5psi those will only just make 250cfm

thats roughly 150hp worth, ie too small.

Nismo-san

what turbo would you suggest?

all your imput really helps...

seerex

Why? Its going to be harder and it will cost more. Tons of people have turboed those cars so why make it harder then it is?