supercharger or turbo?

[Jesse@JDLAutodesign]

Originally Posted by JoeBoxer

Sounds like an excellent start, how about starting a new thread so updates for the JDL kit can be all in one place?

We will when the time is right I just wanted to give my opinion on this subject since some question the drive ability and response of turbos while seeming to lump all turbo's into one generic category. Look at factory cars like Evo's, JDM STI's, 335i's etc..

[JoeBoxer]

Originally Posted by Jesse@JDLAutodesign

We will when the time is right I just wanted to give my opinion on this subject since some question the drive ability and response of turbos while seeming to lump all turbo's into one generic category. Look at factory cars like Evo's, JDM STI's, 335i's etc..

I know it's not in the category of those cars but i had a Sonata 2.0T twin scroll and aside from it cutting power in the lower gears to eliminate torque steer it was very responsive. 60-100mph it was pretty quick stock, i never did any upgrades on it. I can only imagine what you will be able to do with that setup, twin scroll seems like a good choice not sure why more aren't using it.

[AVOturboworld]

There's a lack of larger twinscroll options is one of the reasons. Another is cost - depending on the market/car, people are quite unwilling to spend a good amount of cash for a slight bit of extra response.

Lets talk twinscrolls in the Subaru market, for instance. Besides OEM, there's little in the way of twinscroll hotsides to use. That limits you in CHRA sizes you can use right there. Then, once you've moved to a twinscroll unit, you will need a twinscroll exhaust manifold/uppipe as well, and frequently a twinscroll downpipe. So it's not a simple case of getting just a twinscroll turbocharger when it comes to hardware.

[JoeBoxer]

Are there any OEM Subaru twin scroll turbos that could be used? I'm pretty sure Crawford is using a turbo off a STi but i don't know if it's twin scroll or not.

[Captain Insano]

JDM STi EJ207 and FI FA20

[Jesse@JDLAutodesign]

Originally Posted by AVOturboworld

There's a lack of larger twinscroll options is one of the reasons. Another is cost - depending on the market/car, people are quite unwilling to spend a good amount of cash for a slight bit of extra response.

Lets talk twinscrolls in the Subaru market, for instance. Besides OEM, there's little in the way of twinscroll hotsides to use. That limits you in CHRA sizes you can use right there. Then, once you've moved to a twinscroll unit, you will need a twinscroll exhaust manifold/uppipe as well, and frequently a twinscroll downpipe. So it's not a simple case of getting just a twinscroll turbocharger when it comes to hardware.

Everyone has opinion of what certain trade offs are worth. Personally i won't go back to a non twin scroll turbo setup on a car. I've seen the gains from a proper setup both on the dyno and real life driving.

I understand what you're saying about going twin scroll in the subaru market, however how does that apply to the FRS/BRZ? Someone will need to purchase a kit that includes a turbo, manifold, downpipe, etc anyways. I can't speak for any other potential twin scroll kits on the market, but i know ours can fit turbo's ranging from 350hp to 700hp which should fit 99% of peoples needs. The internal wastegate really negates any major price difference over a non twin scroll setup as an extra wastegate, dumptube and fabrication aren't needed.

[Coheed]

I have done my own testing on the Twinscroll stuff as well. I used a .78 and 1.06 AR housings on my GT3076r. The .78 on my SR20VE was choked. It surged, even with the ported compressor housing. The 1.06 housing was a lot better. I have dyno comparison sheets as well, though I don't want to get too far off topic.

When the housing was switched over to an open housing there was a loss of response. Also, mid-range torque suffered slightly. However, top end power of the .63ar was better than the 1.06 divided housing. The differences were even larger as the revs went up. Revving to 9000rpm and the divided housings were clearly running into flow issues, as backpressure went up substantially. But it was a torque monster.

When I bolted up the 6262 and .82 housing, the loss of response was worth it. The car pulled everywhere once the VVL hit. Pulled to 9k like a raped ape, and lost perhaps 500rpm spool onset. But the mid-range response suffered. This was good though, because the FWD SR transmission is like glass. And 430wtq shattered gears at will.

I would like to see how a twinscroll would work on a smaller turbo though. I love the GT2860rs. And I really want to try the GTX2863r. A boost onset of 3500rpm with instant response afterwards is perfect! Pull to 8000rpm. No need for more than that. 350whp is good for at least 12s. And perfect for power onset drifts.

[MANDALAY]

Originally Posted by 2forme

Link?

See mine above with a small SC

[MANDALAY]

Well ill be tuning soon my latest set up.

Currently was 351 RWHP with the little Rotrex C30-94 at PSI

Standard engine 2liter with OEM air box just forged rods and pistons with C/R lowered to 8.9:1 from 11:1

I evisage it will be > 400 RWHP with the mighty C39-91

The 86 is just harder to layout but ill get there



Billet wheels are not limited to only turbos.

This is the one ill be running

[Coheed]

Originally Posted by MANDALAY

Well ill be tuning soon my latest set up.

Currently was 351 RWHP with the little Rotrex C30-94 at PSI

Standard engine 2liter with OEM air box just forged rods and pistons with C/R lowered to 8.9:1 from 11:1

I evisage it will be > 400 RWHP with the mighty C39-91

The 86 is just harder to layout but ill get there



Billet wheels are not limited to only turbos.

This is the one ill be running

Your setup has me convinced that some day the BRZ will be making 350whp with a basic supercharger setup.

[2forme]

That looks almost like a Beams....

[MANDALAY]

It is , and new, not a clip