Turbine housing sizing + quickspool valve

Go with as much as you need, you can always upgrade. If it's top end all out performance you want go witht he 1.xx series but if you're looking for low end short burst performance the .82 maybe the best route.

[ghrarhg]

I finally got my gt3271 up and running on my 2800 hybrid. It has the 0.78AR twin scroll turbine housing, and I can have 4 psi in 5th gear at 2500 rpm (highway speed). I built a custom crossover to run the separate banks to each side of the turbine. Spool is not an issue at all. It almost spools as quickly as my old TGP T25. If you've dedicated yourself to the quick spool valve, I'd probably try the large 1.06 AR housing. You may find that with your extra displacement you don't even need the spool valve though.

[Driver_10]

Ha ha. At least you were trying. Im pretty well knowlegable about compressors (like you said)... I just dont know jack about choosing turbines.

Hmm... I guess a better question to ask would be, "what is the largest T3 turbine housing that anyone here has successfully used". If someone could answer that, then I could take a guess at how large a housing I could get away with if Im using the quickspool valve.

Its not exact sciene, but at least its a start.

[Jonpro03]

This is the only thing I can really contribute.

http://www.turbobygarrett.com/turbobygarrett/tech_center/turbo_tech103.html

But you prolly already knew all that

[Driver_10]

Im crossing into some new territory. I want to use a quickspool valve on a t3 divided exhaust housing. Im using a GT3582R compressor and have the choices of a .78, .82, or 1.06 A.R. divided turbine.

The problem is that I dont have a single uasable mathmatic equation to calculate airflow based on turbine size. The valve in its closed position, will help to spool up quickly and then open fully for minimal restriction when the enigine is at full load. This ultimately will give the ability to use a larger turbine housing. It works on the same principle as a variable-vane turbine. (kinda like using nitrous to help spool up a large turbo) Im just not sure how big a turbine housing that I can get away with.

A .82 A.R. would definitely work well (.41 A.R. at low load with the valve closed), But I think that I can get away with a bit larger still. Id like to use the divided T3 w/ 1.06 A.R.

Its all a glorious game of guessing. Any input on this?


BTW... Im not using the "Sound Performance" piece pictured here because they want WAY too much money for it. (like $500... ouch) Im having Mark at TCE built it for me. Itll probably have better build quality too.