bowtieguy04

ill post pics tomorrow comp is having a brain fart. so far i have a gt 40 turbo, 38mm waste gate, manifold log i built, ls6 cam, 8.1l marine injectors, scorpion fuel rails, intercooler and piping, ls6 springs. built 4l60e. im trying to track down a 2 bar map from the cobalt ss. i know i need a bov. what about fuel pump? 255lph? i have a msd boost a pump, do i need it? i want to run some 5-9 psi then later maybe switch things out and go for more. high flow cats or no cats? yes i have done searches. tired of reading the hundreds of forced induction entries. comment tips sugestions

Silver_TransAm

iTrader: (2)

The 255 pump should be enough for that power. As for the cats, I would just ditch them unless you have strict emissions testing then go for the high flow cats.

bowtieguy04

what about o2 placement i know i can turn the down stream ones off but what aboutup stream 02 placement?

bowtieguy04

check out the pics of my setup in my albums

Silver_TransAm

iTrader: (2)

If you go open loop speed density you wont need any o2's at all. Just a wideband to tune it.

bowtieguy04

how do you go open loop, in the tuning off course but where on oh say hp tuners

BLKSSLTT

iTrader: (10)

upgrade your springs buddy... even tho you have a relatively tame cam, use the .660 lift springs with some ti retainers and hardened pushrods. the pushrods are a well known weak link in these motors and also there will be far more pressure on ur springs with the boost than the ls6'rs can handle. the guys on ls1truck.com all haave turbos and can answer any of these questions in seconds for ya... good luck

bowtieguy04

so thats it? either i got everthing i need or im getting no love

sujomatt

iTrader: (7)

Thats what my tuner said, would that still allow me to pass emissions? i am in a state that does sniffer n all that nonsense.

JAX04

iTrader: (17)

what hp is your goal. rwhp?

bowtieguy04

maybe 450- 500rwhp for now then once i get the hang or the turbo stuff im going up

JAX04

iTrader: (17)

what kind of car? i know im gunning for the same goals in my ls1 gto. and i dont need a 2bar maf. hp tuners will correct the problem we have with ours

bowtieguy04

2005 silverado 5.3l scsb

JAX04

iTrader: (17)

i see. i thought you were doing a car. all that room up fron man do a front mount

Silver_TransAm

iTrader: (2)

maybe. Not sure though. But, my guess is prob no.

bowtieguy04

[QUOTE][i see. i thought you were doing a car. all that room up fron man do a front mount] i already have a front mount in the truck

bowtieguy04

thats what i have is a front mount turbo

98Z28CobraKiller

iTrader: (17)

You don't need to run speed density in order to shut off the stock O2's. You can run open loop with a MAF. Just have to make sure that the open loop fueling table is setup correctly. If you turn off the O2's without fixing the OL table, your car will run PIG rich.

thumpstick

I would think that you might need a larger or a second wastegate. The 38mm might be a little small for your application though I could be wrong... If you stay with the 38 for now I suggest you set the boost to about 5psi and run the car and see if the wastegate can keep up to check for Boost creep.

Good luck,
-John

bowtieguy04

i think its a 38mm the turbo also has an intyernal waste gate. but i dont know what its set at ill have to run the truck to findout then turn it up or turn it down the guy i bought the turbo from said he had it set at7 psi but i want to check it for myself