kpt

I want to single turbo my stock ls3 what size turbo do you guys recommend me using?

kpt

Goal is to make around 700-750whp

krazy4

iTrader: (5)

I think a 76mm would fit the bill nicely.

How much money do you want to spend? You could get it done with a cheap S475 BW too.

Shoaf85

iTrader: (9)

IMO I would do a BW S475 with a T6 flange. The LS3 is a larger cube engine so the T6 will help reduce any issues with backpressure (not that you will have issues at that power). The Borg Warner turbos are VERY affordable and if later you wanted to crank it up a billet S480 would bolt right in its place. Ultimately it comes down to what you want to spend and what your end goal is, although it's always nice to have room to grow!

FWIW I run a standard S480 T6/1.32 on my stock LSX longblock with GREAT results

kpt

Whats size back housing do you guys think would be good? And Yeah I was going got upgrade the can chain and valve springs also.

FirebirdSS

iTrader: (7)

You won't break a ls3 chain. Just do springs.

kpt

Ok what springs so you recommend

FirebirdSS

iTrader: (7)

Brian tooleys, some of the best and easy on the wallet.

kpt

Ok I'll look into them Thanks.

ScreamingL

FYI Stock48 has a BW 76 with a T4 and won drag week..makes around 1100 rwhp foot brakes harder then many ppl leave on transbrakes

T4 on this mans Ls3 is fine

Shoaf85

iTrader: (9)

I've seen his setup and it works, no doubt T4 will definitely be fine on OP's setup. I just prefer lower backpressure if possible. I've seen T4's make 1100whp on V8's. With a larger cube engine it just makes the setup more efficient with the larger a/r IMO his car wouldn't suffer at all with the T6 over the T4 so that's why I recommended it. The only reason I would keep it a T4 setup is if it was a class limit.

kpt

You guys think it would have a lot of lag with a a/r 1.32 back housing

FirebirdSS

iTrader: (7)

As long as your hot side is properly built, a big AR will spool just fine. Dropping AR to gain spool on a oversized hot side is a bandaid.

ScreamingL

the fact his setup is over 1000 rwhp says alot and fact he foot brakes as well as he does.....T6 would be a dog off line and down low vs the T4....others have tried and it showed these results when trying to duplicate his setup.

376 isnt large enough IMHO especially with a small cam to need a t6

Shoaf85

iTrader: (9)

With the right converter a T6 car could footbrake very well also. My car actually footbrakes in the high 1.3's, I'm only running 12 lbs of boost and leaving on 7psi. I always use tbrake when track is good tho, but I think I could footbrake into a low 1.3 60' on a good track and ramping the boost in quicker.

I'm really not trying to argue though, we can agree to disagree lol : )

Either way good luck to the op and I'm sure it will be a blast when completed, LS3 is an awesome engine to throw boost at.

ScreamingL

stock48 uses a off the shelf yank 3000 stall

yes you can run a larger stall and bigger cam and yada yada then you have why doesnt setup run like others do with smaller...

T6 is for big cubes IMHO but what do i know

Paul Allen

Can a stock ls3 take that much power?

kpt

what do you guys think about this BW s475

HIGH FLOW UPGRADED 11 BLADE BILLET COMPRESSOR WHEEL
74.53 mm Inducer x 106 mm Exducer
COMPRESSOR FLOW OVER 110 lbs/Min
Rated for 500-1100 HP

Turbine:
96mm inducer x 88mm exducer
T6 Divided 1.32 A/R

Shoaf85

iTrader: (9)

Yeah that's a popular turbo for these platforms.

ScreamingL

yup made over 1000 rwhp with stock internals same as the Ls3 has but only with a Ly6