Sneakin Deacon

anyone have one, or know where one is for a T4 60 trim .82 A/R?


and would that be a good turbo for a 5.7L? and would 36lb/hr low impedence injectors cut it?

flubyux2

TO4E "60" Trim

i was going to build a Turbo LT1 for an 88 trans am GTA... but i was going to use at LEAST a T66 w/ a .83 AR on the hot side.

T66 compressor map Notice the peak airflow value as compared to the 60 trim... the 60trim peaks out at about 2.3 PR...or about 19psi. at about 19 psi, full tilt, the 60 trim will only push ~50 Lb/min of air whereas the T66 will push a whopping 72 lb/min of air at about 25psi.

roughly speaking, 1 lb/min of air is capable of making 10 HP. i remember reading that somewhere... so theorhetically speaking, the T66 can make 720 HP, and the 60 trim could only make ~500 HP. But thats probably at peak volumetric efficiency and Brake mean effective pressure. wherever the peak airflow occurs in your RPM band is where your torque would peak on the Dyno... but you wont know that till you match up your hotside.

Sneakin Deacon

thanks a ton, i was just curious, cause the turbo is available to me for $400, just rebuilt 0 miles. its going to be a TIGHT squeeze to attempt this, and im only going to try to get 10-12 psi out of it..nothing more, dont want to blow gaskets or lift the heads

flubyux2

it would work. espeically w/ only 390cc injectors. let me bust out a calculator to see how far 390cc injectors will take you.

flubyux2

ok... 36lb/hr (multiply lb/hr times 10.5 to get cc/min ratings) will take you to about 400 flywheel HP on a TBI/TPI V8 turbo application w/ BSFC of 0.65 lb fuel per hour/1 HP (NA=0.45 BSFC, SC=0.55 BSFC, TC=0.65 BSFC) this is all @ 43 psi. but, youll be SERIOUSLY maxing out those injectors.

you can run about 500 flywheel HP if you jump up to 450 cc/min injectors, maxed out.

bigger injectors mean more fuel, means more HP potential.

Sneakin Deacon

BSFC should be around .65 or so since its turbo

and i wanna put 425 to the wheels

425 x .65 = 276.25
------------------------------- = 431....so im guessing 43lb/hr injectors?
8 x .8 = .64


does that look right to you?

flubyux2

assuming a typical 20% drivetrain loss of HP, in order to run ~425 RWHP, youll need to make 550 flywheel HP.

for that, you should run a set of 550cc/min injectors. at that point, a stock-type TPI manifold is gonna be a major restriction. i would suggest a single plane manifold... you dont want monster torque down low... cuz you will annihiliate your tires... a single plane manifold will help shift your power band further up and let you get out of the hole easier w/o goin up in smoke...

besides, running the 550's will allow you to have a margin of safety instead of running maxxed out 450's. youll have better control over your fuel delivery.

check out www.sdsefi.com for nice ass stand-alone tuning systems for use w/o laptops. they also have a nice ass tech page that outlines ALOT of how-to build your own [enter part here]

Sneakin Deacon

i checked out that site, and noticed it said it doesnt use the OE cas, or air idle controller and no datalogging capability...how much does this cost?

i was lookin at the Electromotive TEC3 system, it looked real nice, and im thinking it would eliminate the optispark totally, so if its less then 2500 dollars, it totally worth it in my opinion, its about 2500 to convert the optispark out of an LT1, might as well do that and get a stand alone fuel system aswell

Sneakin Deacon

...just got off the phone with a Dealer of the TEC3...beast is 3600 dollars. so depending on price of the sds system i think i may go TEC3 eventually.

flubyux2

Yea the Tec3 aint cheap, thats fo'sho. it depends on how much you want to control. but the SDS will definilty get the job done pretty well, and simply put. dont need to mess w/ computers and what not, its pretty much self contained. I dont think it comes w/ any base maps, so youre still at square one with either system... meaning youll be fiddling for an hour just to get the fuel pump to kick on