HKS GT Charger and TT planned by HKS

CCCLXXZ

I know that I will be waiting out for the HKS charger system... If I had to take a guess I think that it will debut at TAS 2010.

http://www.topracing.com.hk/catalog/...IRLADY%20Z.pdf

I know in the past they may not be making the most power but it is my favorite by far.

Mmmm... I may just have to go and pick one up myself.

Nick J.

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RCZ

so what else matters for superchargers other than power again?

Shunya

good question.

CCCLXXZ

Great question,

I didn't intend to make it seem as though power gains were not the goal, but wanted to reference that historically on the 350z the HKS system provided gains of 70-100 whp if my memory serves me correct. Compared to other FI options that were offered for the VQ, this fell into the average spectrum.

While some members on the board may be looking for the biggest and best bang for the buck regarding modifications and power, my goal is to incorporate unique and well engineered products to create a balanced and well appointed 370z. A calculated combination that I look forward to execute and more importantly enjoy.

The HKS GT system fits the bill, and I am eager to see how the more recently design HKS charger compares to the outsourced rotrex unit used in the past.

Nick J.

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Mods - Maxim Works Exhaust Manifold, FI HFC, Mines Y-Pipe, Saclam Silencer

TARDCORE

What else is important? How about reliability.

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1slow370

What else matters? it says HKS which is almost as baller as the word Porsche hell I'd pay 4 times as much for it(sarcasm).

Reliability, power delivery, drivabilty. It's probably going to be another High RPM, boost building, centrifugal Heat pump like always. I'd go twin screw(not roots) because I need torque and low-end to pull out of a corner instead of balls out top end power that isn't as usable unless you're a dyno queen.

Shunya

I'm gunna have to agree with you. I'm going to go with the Twins as well.
Low-mid End power seems more useful on the track as well.

RCZ

+1 on the twin... I was kidding about the what else matters, but yes... I actually think the power delivery is the biggest difference. I will not be buying anything but a twin screw.

1slow370

Twin Turbo is nice but I'm not really a turbo guy. They make great power and it feels like the car is gonna take off, but I hate "hitting Boost." I'm talking A Lysholm style twin screw supercharger that looks like a roots blower but the rotors are conical and in a male female relationship that positively compresses the air in side the case of the blower. You "hit Boost" as soon as you put the pedal to the floor and it's at peak right away, there is no boost curve. HUGE torque gains and effectively it's like putting a V12 in your car. It has advantages over a roots setup because the rotors are more efficient so the air charge is cooler and it take less power to drive the supercharger. It also doesn't taper off towards redline like a roots blower does and a whipple 140ax 2.3L blower is capable of pushing 600hp worth of air, with units up over 4Liters available. Of course no one makes a kit with one of these compressors currently so you would have to make it yourself, good thing I happen to be a machinist huh? oh and the whipple i mentioned costs about 2,400 for just the compressor.

Togo

^That sounds nice!

1slow370

yeah there is always hope stillen could use a twin screw unit in their kit so i'll probably wait to see how that goes first before i start because I would love to not have to stay at work for an extra 10 hours a week building the brackets and pulley shafts i would need.

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

JB-370z

Has anyone heard any news on the HKS charger? I was wondering if I could use the HKS 2.5" exhaust with this system???

KingDavid

That doesn't sound too good. Sounds like a spin-fest.