07lane40

i got a quesion for anyone who has done thier own custom turb kit, or anyone who even has a turbo kit. particularly those with an s197 4.0 V6.

First off I am using the 4.0 i want no suggestions toward swapping an 8 in there.

I have a list of things that i am positive i will need, and i would appreciate any heads up on what else i will need to complete my own kit, and any suggestions on where to get anything would be appreciated.

I plan on running 12 psi on a street tune.

(2) Turbonetics T3 .50 trim .
Tial 38mm Wastegate
HKS universal BOV
Hot Side Piping est. $250 (aluminized/stainless)
Cherry Bomb Mufflers
Exhaust Tips
Universal Flex Pipe (to existing exhaust)
Spearco Intercooler
Silicone Couplers and clamps
39 lb/hr injectors (maybe larger)
Spec Stage 3 clutch
Tuner


also, are there any reputable places to get the car tuned in the Ohio/WV area?

Thanks guys

luckythirteen13

i would consider going single turbo instead of twins. your talking about running the same size turbos that i run but with a much smaller motor. a single 68 or t70 should be perfect. if you do stay with twins, you will need 2 waste gates, not just one.

your probably going to need a bigger fuel pump. im not sure what your hp goal is but 39s might be small. a mild turbo v8 can run 39s but to make the same power as a v8 with 39s, youll need bigger injectors because with a v6, you have 2 less injectors feeding the motor.

you dont mention any time of boost controller but if you just plan to always run the same boost pressure then you dont need one. you just buy a wg with the correct spring.

you dont mention oil lines. you need feed each turbo with fresh oil and then have it drain back into the pan.


you seem to have a good grasp on the parts you need. you have all the major components listed, small things will pop up as you start to build the kit but thats how it is with all custom projects.

07lane40

thanks a ton! i appreicate you sending me in the right direction!

07lane40

im looking at making about 400hp to the wheels. if anyone can help with injector sizing

luckythirteen13

i used this site http://www.gtsparkplugs.com/InjectorSizeCalc.html

and entered your info.
470hp....which is about 400rwhp
bsfc of .6
6 injectors
.80 max duty cycle. you can go as high as .9 but itll shorten injector life
and used 42psi for fuel pressure

came out to 60# injectors

if you go with a boost referencing fuel pressure regulator you can get away with smaller injectors. they add 1psi of fuel pressure for each pound of boost the motor makes so if you set base at 42psi and make 10psi of boost your fuel pressure will be 52psi at full boost.

and with such a small hp goal i would really look into a single turbo. one turbo will be cheap because not only are you not buying two turbos you need less tubing for a single kit, only one wg and your intercooler only needs one in and one outlet instead of two inlets and one outlet.

07lane40

thanks for the help with the injector sizing.

one of the reasons i want to use twins is that one - theyre twins (haha) and two i figured i'd get pretty good spooling from two smaller ones vs one big one. and i just happen to find a good deal on new turbonetics t3s .50 trims. 379 ea is actually much cheaper than any new single i could find.

i also found this

http://www.squirrelpf.com/turbocalc/...&product_id=77

and if i'm reading this right two t3 .50 trims will be right for my power goals and for a solid streetable powercurve

07lane40

just so you know its not just a picture i found. haha. there's a calculator, from what i've looked at one of the better ones on the internet.

http://www.squirrelpf.com/turbocalc/

07lane40

also as a heads up i plan on mounting them underneath the car one on each of my longtube headers to try and maximize flow/spooling. The will be protected by a skid plate.

The system will look like this: each turbo will be mounted directly off of each long tube header underneath the car. They will be covered by a skid plate. The hot side will run together under the engine and into the intercooler, then up into the maf/intake. the used exhaust gasses will then go into the flex pipe to the existing exhaust then out the cherrybomb muffs.

luckythirteen13

you do know that with rear mounted turbos the oil cant drain via gravity so you will need a scavanger oil pump to pump the oil back up to the motor?

thats what i want to do with my 07f15 is run a rear mount single turbo. a t70 would be perfect for my hp goals i just dont like the idea of relying on a pump to get the oil back to the motor. if the pump fails, the seals in the turbo will blow due to excess oil pressure

07lane40

i see... have you head of the pump failing being a regular problem?

the car is going to be a street/strip car not seeing regular DD action.