Your target is 20psi on the stock motor??

 

20 psi will most likely break something in a stock motor with 156k on it...and 720cc injectors are pretty damn big...i ran 550cc injectors up to 17psi and had no problems...i would suggest using a smaller injector unless you plan on making 450whp+...the main thing is tuning...make sure you tune it before you go smashing on the throttle...good luck
_niko

 

yes i wanna go 20psi or higher, but that will be after i get better pistons
as for the 720 injectors, the little formula i worked out said 683cc at 79% duty cycle so i went with 720 just to be safe

3rd gear, what hp you running?

 

i never dynoed the setup but i would say ~300whp@14psi..but i no longer have it...i ran out of money so i parted out all the parts...i do have a ka24e rebuilt block with JE pistons in it w/3k miles...if your interested email me at tvhs5stewart@hotmail.com
thanx
_niko

 

how much are you looking for for that block 3rd gear?

 

im running CP pistons, 8:1 compression, the guy that built my block didnt think i should run more than 10psi, tuned.

20psi is probably out of the question with stock rods.

 

the block has 8.5:1 CR JE pistons, oversized wrist pins, all new clevite bearings, cryoed crank, 3 angle valve job, Si exhaust valves, mild port&polish on exhaust side and only 3k miles on it..i would like $1200 + shipping...thanx
_niko

 

and the stock rods have been proven to hold 14psi+...JFYI...I know because i have done it...
_niko

 

good luck man

 

The injector size seems a little excessive

 

well the formula i used says thats the size i need

HP x BSFC = Total Fuel Req
350 x 0.6 (0.5 for NA, 0.6 for FI) = 210 lb-hr

TFR / # cyl = Uncorrected Injector
210 / 4 = 52.5 lb-hr

60000 ms / max rpm = Available Injector time
60000 ms / 6500 = 9.23 ms

Injector recovery time = 2 ms

Max Duty Cycle = (AIT - IRT) / AIT
(9.23 - 2)/9.23 = 78.33%

Corrected Injector size = Uncorrected Injector Size / MDC
67.02 lb-hr = 52.5 lb-hr / 78.33%

lb-hr * 10.2 = ccm
67.02 lb-hr *10.2 = 683.617 ccm

since i dont think they have 683ccm injector i went with the 720 for added insurance

If you have any other input or if i made a mistake let me know

 

also does anyone have any input on my turbo choice and limitations?

 

i know people who have dyno'd 310+whp on 370's.... just up the fuel pressure a bit and you'll be fine.

I wouldnt go any bigger than 550cc. you wont get your car to idle.

 

im still trying to learn all there is to turbo setups and all that shit.
i have a 92 with 168k on it. if i wanna slap a turbo running 8-10 psi should i do a rebuid with foreged pistonsl? im trying to get around 275-350 hp, is iy necessary for that kind of power, or should i jsut do a rebuild later on?

help a brotha out

 

well.. you're talking about a different motor than the post was originally about.. however, at those power levels, I always like to play it safe.. if you can afford to build the motor for boost, do it.. if you can't, keep the boost very low.. in either case, I wouldn't trust a 168k mile motor to hold up to 8-10psi for a very long time.. I'd say, if you're on a budget, turbo probably isn't the way to go.. but, if you've got a decent bit of cash to spend, build the motor, then go turbo.. or, at the very least, rebuild it with stock parts, and put a metal head gasket on.. I think Cometic has a few different thicknesses.. so, the thicker the better in that case, to keep compression lower.. but, I believe 350 is attainable on a stock twin cam.. for how long though, is the question..






Fast/Cheap/Reliable

you can only have 2!

 

The stock rods can take a little beating but, there is a limit..about 25psi on a T70 is it. Here is his setup and vids:

"this is my 89 coupe . ka24e stock rods ,arias 8.8's 'cometic mls 'arp head studs and a t70. 25psi and slicks on the street.
ka24et lanch
ka24et 2nd&3rd
ka24e blown to smitherines
running the whole time
the rod snapped off at 6200rpms in 4th gear"

I plan on running 14 psi on my stock block E this up coming season on E85