Kurtis2short

iTrader: (4)

I have a 396 a ly6 bored .030 over with a 3.90 stroke crank ls3 heads and a 102 holley hi ram. I bought a pair of billet double ball bearing turbos precision 6262 v band with .82 ar housings. The cam was species to turn this motor with a billet s480 with a 1.32 housing up to 7400 7500 on my shifts. Will the .82 houßong choke my motor out turning them that high ? Should I switch to a open t4 1.00 housings? I'd like over 1000rwhp I'd love 1200 rwhp lol it's for road racing

stevieturbo

6266's would have been a better choice.

I'd probably go for the largest open scroll they offered

What valvetrain setup are you using to aim for 7500rpm ?

Kurtis2short

iTrader: (4)

Stainless steel manly valves braintooley 660 springs moral linked lifters and brain tooley push rods and finally ls3 rollers with the trunion upgrade

Kurtis2short

iTrader: (4)

I'm sorry they're the 6266 pte s they were on my kits Camaro they came in his kit

stevieturbo

If you already have the 0.82 and the turbos are easy to access to change later, then just try them.

If they are difficult to get to, then maybe is a good idea to change now.

I'm sure it will make the power and your goals either way though.

Cam will have more of an impact on the rpm's than the turbine housings will IMO

slowride

iTrader: (3)

.82 is the largest t3 dual v band housing for a precision/turbonetics turbo unless you go to Tial/Garret which come up to slightly over like 1.02 or 1.06. You would have to get the turbine side matched to the 66mm wheel though. Lots of work/expense for a very small upgrade in size.

On good fuel you will be able to make over 1000 whp with what you have. Not so sure how well the power will be over 7000 rpm, but it should have good response with the cubes you are talking about.

stevieturbo

I'd presume T4 housings ?

If T3, then they would be small, so go as big as you can.

Kurtis2short

iTrader: (4)

The v band on them right now are only 2 inches I see that as a major choke point. I think a pair of t4 1.00 might keep me from choking in the upper rpms? Possibility at least I can hope they are 240 new off eBay if any body has a better idea I'd love to hear it lol

slowride

iTrader: (3)

The 2" inlet isn't really the problem as it is larger than the actual volute. It's the A/R of the housing or volute area that limits you. If you want it to respond try it as is as those housings can still produce 1000-1200whp depending on fuel used, etc in a manual trans car.

I use the same housing on my cast Turbonetics 62/65 turbos. Engine is a 383 ~10.0:1 and response is good, but not super fast. I bet they are perfect the way they are for road racing as crazy as that sounds.

stevieturbo

The inside of my turbines drop down to a little over 1.5" ID, and certainly around the 15-17psi range, I'm sitting at a good pressure ration or close to 1:1 EGBP vs Boost.

I'd have info with more boost, except the piece of **** pressure sensor I was using for EGBP keeps dying.
2 have died now so far, need to try an alternative make.

So I certainly dont think a T4 1.0 would have any problems

Kurtis2short

iTrader: (4)

I was on the phone with precision today for about an hour half of that was wait time. They told me that they only have .96 t4 open flanges is as big as with get but I know I've seen 1.00 t4s so yea but they were thinking my back pressure will be to high with as the sit right now so I guess Friday I'm buying some housings

slowride

iTrader: (3)

Just remember t3 housing sizes don't really relate to t4 sizes. A t4 .81 flows way more than a t3 .82 etc. Going T4 at least gives you options to go up and down sizes to fine tune the response. With the t3 stuff you are maxed out at the .82 or slightly larger.

LS1NOVA

iTrader: (12)

Id switch to T4's.

Kurtis2short

iTrader: (4)

That's what I'm leaning in are the t4s I'll be staying in the upper rpms most of the time so I say lot them sing