HKS GT Charger and TT planned by HKS

JoeyD

^^ If you think all the other twin screw designs pale in comparison to the Lysholm you should check out the eaton TVS design. I'm fairly certain it's the state-of-the-art unit right now. That being said, I'm also fairly certain that Eaton provide most, if not all, the twin screw units being produced today.

Kind of back on the subject, what kind of superchargers is HKS using these days? I know they used the Rotrex units for at least a time. I heard great things about the planetary drive system Rotrex uses.

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1slow370

the tvs does develop boost a hair faster and harder than the twinscrew units but it's efficiency is nothing like a real twin screw. It takes more power to drive lowering the net output and requires a more sophisticated intercooler to get the temps down due to lower adiabatic efficiency. It's a huge improvement over your standerd roots type but it still isn't twinscrew, it's just a blower not a compressor. Blowers have symmetrical intermeshing rotors like two gears running against eachother. the air is trapped between the teeth of each rotor pushed around the outside of the rotor against the case and shoved below it. Superchargers spin the opposite direction of what most people think they should kinda like this (tOOt) the air goes around the rotors from the top of the t's out the bottom. Twinscrew blowers turn in the same manner but have crucial differences, the rotors are opposing cones set up so that air enters at the fat end of the female cone and is compressed by the male cone into a progressively smaller space until it exits the blower. This actually produces a compression ratio in the blower. My work uses a huge 9 liter version to run all of the pneumatic lines in the shop (well we rent it when our busta 100 yr old two stages are broken). These differences in basic design are what produce the difference in performance. The twinscrew type is always compressing the are despite what happens afterward. Blowers only form boost when they push more air then the engine needs. The heat of compression is actually formed in the manifoldbecause that is where the compression takes place. In a twin screw the heat is released inside the blower and leaks into the manifold with the air charge. Twinscrews need to be built to handle the heat they produce, the rotor design is FAR more complex to machine (I'm a machinist and it makes me wonder how the hell they do it), but in the end it releases less heat into the manifold and due to design creates less in the first place.

Technical issues aside look at the vehicles they go in twin screw: Some AMG cars, ford GT40, tvs:GM four poppers and the vette ZR-1(GM has a purchase agreement for the TVS technology). It's a price thing if you want to pay 50% more and don't care so long as it is the pinnacle of performance with real world gains you buy screw not roots. There is a TVS Based four lobber in the new gt500, the best upgrade for it right now is a brand new whipple twinscrew (kenne bell is coming out with a dedicated unit for it as well). With the same boost you make more power with a twinscrew and it is delivered in a flatter manner.

Oh and EATON makes the majority of ROOTS BLOWERS not TWINSCREW COMPRESSORS

jran76

They stopped using the Rotex a while back. There are conflicting opinions on why.... Some say reliability, others will say it was more of a cost issue. Regardless, HKS thought they could do it just as well on their own because they are using a proprietary centrifugal-style "blower" that is very similar to the Rotex. It has a planetary gearless drive system in a pretty compact size.

More info. here: HKS USA GT Supercharger

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2009 G37S Sedan-6MT: Advan / Volk / Tein / SPC / Invidia / Cobb / K&N

JB-370z

My question is: Will my HKS 2.5" exhaust be a bottle neck if I were to get somthing like this?? Below are some clips!

Here is a 350z with an HKS charger: http://www.youtube.com/watch?v=VFetQlD5IbI&NR=1

Here is a G35 with an HKS charger: http://www.youtube.com/watch?v=FYhn3FF4TQw

jran76

Don't think it will be a problem. The HKS GT S/C will not be a high boost kit, and S/C don't need a free flowing exhaust like a turbo does. A true dual 2.5" exhaust should be sufficient.

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2009 G37S Sedan-6MT: Advan / Volk / Tein / SPC / Invidia / Cobb / K&N

G Fo12ce

Let's not forget HKS spent the money here in the US to get the GT Supercharger for the 350Z CARB certified. No tickets, no referee stations, no changing your car back to stock to get a smog check done so you can get your registration renewal.

I car pool with a friend/coworker who has the GT Supercharger on his 350. It's awesome. He's not going to win a WHP shoot out but it's got lots of useable power under the curve and great response. He beats on it too and no probelms.

1slow370

hop on over to the stillen thread it is almost impossible to put a twin screw or roots unit on our cars.

G Fo12ce

They stopped using Rotrex a while back after designing what they say is a better drive system. They weren't happy with the falure rate and other things on the Rotrex units. They have detailed info here, click the tabs to get to the various info:
GT Supercharger

The twin turbo they are working on is an engineering excersise to see what's possible. A S/C is not off the table either, but they are not really putting it out there right now because they don't want to piss off anyone if they decide not to produce one or either. The OP must have found out about it through a friend. I think I'm going to see a friend at HKS soon and I'll look at the car if it's there, but I don't know what I'll be able to share.

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