Turbocharger quick spool valve/Variable inlet turbo

[bshotts]

Interesting find from Supraforums and Sound Performance. It's their quick spool valve...very similar to what Acura uses on their RDX Turbo. I know how awesome these systems work, our RDX hits 13 psi right off idle! Valve is either operated by wastegate signal line or user selected position via solenoid valve. By closing one butterfly of this valve, a restriction is placed in the exhaust stream increasing gas velocity and spools the turbo much faster producing more low-end torque, then opens fully when gas volume increases as engine speed builds. Look at their dyno sheet for a GT45 on a 2JZ.

http://www.spracingonline.com/store/Sound_Performance_Quick_Spool_Valve/3643

I don't see a torque increase of this magnitude for smaller engine/turbo combos, but maybe a fairly substantial one and certainly increase boost response.

I didn't see an option for our popular T2-flanged turbos, and they also suggest having an undivided exhaust mani/divided turbine inlet, so it suits twin-scrolls nicely.

I am challenging vendors here on Zilvia to produce something similar to for our larger T2 turbos (ie GT2871, 30, 35).

[Flicktitty]

i'm sure if you got enough interest and talked to Larry or Reid at Sound Performance they will make one for the T2/T3 or what ever other manifold you could need.

+1 for SP.

[R33E8]

Kinda old news.. The idea "possibly" originated from this thread:

Faster spool and more boost (http://www.theturboforums.com/smf/index.php?topic=45148.0)

[bshotts]

I just envy how my RDX builds boost so quickly....granted you're working with 2.3L, higher-compression, and most likely a fairly small turbo. I can't imagine why there aren't more devices like this in relation to turbocharging, especially for smaller engines that want to use larger turbine housings.

[codyace]

I don't really think you'll see much support for the t2 flange, simply because anyone who realistically is going to use this valve, will know that going with a t3 and 30r will provide awesome response, but with the added HP. Sure you could make a 2871r spool sooner, but 3500-3800 is where most see 15-20 psi as it is, so how much sooner do you really need it? It already bakes the tires off at that rate, so 'more spool' isn't going to make you any faster.

Again, a 'quick spool valve' will shine with a 30r+ turbo. Get spool under 4000 with it, and you'll have the ultimate street setup, but instead of being capable for 'maybe' 400 whp with a T2 turbo, you'll have room to breath at 450+

I just envy how my RDX builds boost so quickly....granted you're working with 2.3L, higher-compression, and most likely a fairly small turbo. I can't imagine why there aren't more devices like this in relation to turbocharging, especially for smaller engines that want to use larger turbine housings.

They do make them, but with VNT technology. Unfortunatly most of them aren't up to gas motor abuse (this side of the newest/porsche stuff).

[greenman100]

Thoughts on quick spool valve vs. full twinscroll setup?

[R33E8]

I read that Geoff from Full-Race says it has the same effect, but who would criticize their own product?

[greenman100]

I read that Geoff from Full-Race says it has the same effect, but who would criticize their own product?

Where'd you see that?

[jspaeth]

I wonder if blocking the exhaust flow out of 2 of the cylinders has detrimental effects

[bshotts]

I wonder if blocking the exhaust flow out of 2 of the cylinders has detrimental effects

This is why SP suggests that using the quick spool valve requires using an undivided manifold (so the valve doesn't close the path from exhaust ports of a divided manifold) and a divided (twin-scroll) turbine housing. This way, placing the restriction between the mani and turbine housing will increase exhaust gas velocity by reducing the area in which it has to travel, i.e. through one side of a divided housing.

I can't remember off the top of the noggin, is the OEM SR20 exhaust mani divided or not?

[jspaeth]

This is why SP suggests that using the quick spool valve requires using an undivided manifold (so the valve doesn't close the path from exhaust ports of a divided manifold) and a divided (twin-scroll) turbine housing. This way, placing the restriction between the mani and turbine housing will increase exhaust gas velocity by reducing the area in which it has to travel, i.e. through one side of a divided housing.

I can't remember off the top of the noggin, is the OEM SR20 exhaust mani divided or not?


I think so, but not 100% sure......I don't think it's FULLY divided....I think the divider stops like an inch or so from the outlet.