sahwan

Is Borg Warner s475 with a/r 1.32 good for ls2

Do you think I will have a lag ??

In which rpm will spool??

sahwan

Ls2 with LS9 Corvette ZR1 Cam Camshaft 211/230 .562/.558

Sarg

iTrader: (6)

If that is the 96mm turbine wheel which it should be based off that AR, then yes, it should be plenty fine and make probably in the neighborhood of 700+ with a nice front mount set up. It should start spooling prior to 3000 rpms. Not sure how much boost you plan to run, but full spool will be dependent on that. I would hazard to guess that 15 psi by mid to late 3000s.

mrstepheneades

im running one on a stock cube ls1.... not tuned yet though. Just got it running again... s475 96mm turbine, 1.32a/r t6

sahwan

It's stock bottom for now I plan to run it at 8 to 9 psi

sahwan

I go with s475 or sale it ??

I want no lag only my transmission is t56

jridenour31

Bad choice if you want no lag with a t56.

Taubr Unit

iTrader: (32)

No lag ='s NA. Reguardless you'll have lag, turbos take time to spool, some just faster then others.

Preston99WS6

iTrader: (7)

Really.
OP here is how you can build it to prove the naysayers wrong.
With the right cam it will be fine it's a 6.0 Give Tick Performance a call and tell him what your working with gear/ weight/ intake/ heads, wrap the hotside and put a blanket on the turbo then run as large of a downpipe as you can fit, leave the compression ratio as is, the higher cylinder pressure will aid in spool. Use 2" pipe to the merge this will help it build pressure to spool the larger turbine and is good for well over 1000rwhp and is cheaper if money isn't a issue run two wastegates one on each hot pipe to take advantage of the devided housing If money is tight your only leaving 100ish rpm on the table in regards to spool by running one wastegate. Been lots of discussion on the topic of T56 and S4XX.

Or you can run a 87 or 83 mm turbine with your ZR1 cam. Turbo cost will go up a good 500 dollars though, If you go this route. I would get a cam ground and leave the turbo as is for your application in the long run it will be capable of a lot more power.

Sarg

iTrader: (6)

Seriously? You tried it? There is a guy with the same turbine on a S480 making full boost by like 3200 with a cam and a stock motor. I would not call that lag and that is a larger compressor.

jridenour31

No lag would be boost at part throttle and would require a stupidly small turbine. I'm not saying the turbo is too big but saying there will be no lag is bullshit. And yes, I've used an s475/96 on a 346 with a t56. Positive map by 3200, certainly not bad, but lag nonetheless.

jridenour31

This. The only way to avoid lag is by going too small on the turbo.

tennerv8

iTrader: (7)

Yeah I mean worse case scenario it will rev up the same as a naturally aspirated engine right? An s475 should work well on that engine.

Sarg

iTrader: (6)

Really? What times did you run with it? The guy mentioned eqrler was at 12 psi by 3200 rpms. What did yours do? I have not played with one on a t56 but the other combo was also with a s480, so I can't imagine it being worse.

3pedals

iTrader: (3)

my s480/6.0 combo made full boost at around 3300. it has a 92mm/1.1 a/r turbine on it though. It may have spooled lower than 3300, but we never loaded it up on the dyno at any lower rpm than that. I intend to run my stup with a stick shift as well.
The 475/96-1.32 might not spool quite as low, but should be close.
my opinion about "no-lag" is the same as tauber unit's - they all lag a bit, you cant have instant spool, AND good top rpm power, they are mutually exclusive

Sarg

iTrader: (6)

Cam will make a good bit of difference too on spool time. Spool is so negligible. If you downshift/upshift at the right speeds, it makes spool time almost non-existant. The only time it can play a real role is off the line.

3pedals

iTrader: (3)

And at the track you can use a 2 step and spool will be no problem at all.
I agree about cam being a big factor in spoolup, and I'm not sure how the LS9 cam will be, it seems out to lunch for a turbo setup, but I am not a cam guru.

Sarg

iTrader: (6)

Denmah seemed to notice a big difference with a 80mm turbo on a 6.0 with his cam after he switched from the ls9 cam.

jridenour31

I agree with you 100%. Spool time isn't really a concern to me, even in a street car. His setup won't take long to spool but if he's looking for instant spool, that setup isn't going to do it. Another cam will certainly help but it's never going to spool like a tc76, the turbine is just too big for that. It just depends what "no lag" means to the op.