I plan on turboing my LSJ in the near future. I want to know whats the ideal size turbo for our cars. Which size turbo's are people running right now. I was looking into the 16g or 20g turbo's. any info will be nice with everything

 

gt2871r

 

is that the turbo your going to be running?

 

thinking about it lol

 

haha yeah, but cant find one cheap.

 

Depends on your goals. IE: Power, Spool, etc.

 

I wanna make powarz!!!!

 

x2 to that

 

i have a t3/t4 50 trim precision should make around 370whp

 

thats what im talking about right there

 

your ball bearing turbos will spool quicker but the journal bearing like what i have is half the price. new there on ebay for around 650 i think and rebuilding them is cheap as well

 

Is it a T3... or is it a T4? I don't think Precision does T3/T4 Hybrids.

Well, no ****.

Are we talking 350whp, 400whp, 450whp, 500whp?

Are you willing to sacrifice spool/rpm's for more power?

 

gt3076 is about perfect for mid 3's to 4's.

The s256et seems to be a nice match too.

 

im talking 350 to 400ish

 

I'm making 375whp on 21psi with an S256ET, even more with 22psi.....

I'm going to change my housing from .70a/r to .55a/r to spool faster....

 

get a t3 turbo for sure, the t25 limits you as far as turbo manifolds go, and like stated above, its about what HP/Tq you want but even more specific WHERE you want your powerband, low end/ mid/ high?

id go with a 3071/6r if you have the money, as JC said it makes the mid 300's to 400 power that most LSJ guys are going after, and it makes it in a usable spot for a daily driven car

 

Very true, 3076R is a nice turbo. I think bullseye makes an S252 that would be comparable too.

 

rob this.... which one are you running again?

 

S256ET .70a/r. Making 375whp at 21psi, made 403 at 22psi (did that run for ***** and giggles then backed it down to 21psi again). Bad thing is it doesn't fully spool until just before 5k, which is why I'm about to switch out to a .55a/r. Spool will be much faster and still hold the same power.

 

gt3071r jannetty racing says it puts down 330whp/340wtq @ 22 psi with a 4000rpm full spool

it'll be going on the dyno shortly for some tweaking ... am just out of town right now, once i get back hopefully one day next week we'll have time to put it on the rollers.

at 28-30 psi (complete accident) it broke loose at 75-80mph in 3rd lol

 

yeah and yours is also an LNF.

 

Really? That seems very low for 22psi, in comparison to the other 2 or 3 Cobalts that I know of that ran that turbo. VERY low. Spool seems about on par, I suppose.

I'm pretty sure he has an LSJ...

 

lsj.

I haven't got numbers on my car yet, they were also talking about 19 psi so I may have them mixed up...

This is also the 2.2 Garrett kit modified to fit an lsj, so it may be lower cause of the manifold

 

if i make any less than 385whp im gonna be pissed. lol

 

Lol, love it when people shoot for some obscure # What's the difference between 365 and 385whp on a cobalt?