HKS GT Supercharger (Rotrex) in development!

[Starscream15]

Originally Posted by Turbowned

YESSSSS! EPIC. Cue the Fry "shut up and take my money" meme!

OK!

[cmdboy]

Originally Posted by brzmaybe

The HKS English language site offers supercharger kits for the Infiniti FX35 and GS35 for $4,500.

"Complete Kit: GT S/C with oil system, intercooler, fuel system, fuel management, SMF"

http://www.hks-power.co.jp/usa/

That is a good price...

[ESBjiujitsu]

Originally Posted by cmdboy

That is a good price...

yeah i agree fully ready to run kit with emanage!!!! hell yeah im on board with that all day but thats probably apparent by my sig and my avatar. lol Its going to be the perfect kit.... the only engine specific performance item i will be buying

[Tradewind]

Originally Posted by madfast

thanks for the info!

for you lazy folk here's some graphs courtesy of HKS
http://www.hks-power.co.jp/en/produc...ger/index.html

Pulley test:


restrictor test:


and last but not least, a CVT Rotrex is not far off:
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The power figures in that first chart are similar to what Raptor SC get from the old EJ20 with their kits - except the EJ20 starts at 55kw at the wheels. Would like to see what they can do with this new motor, especially since they have been Supercharging Subaru engines for longer than anyone else and currently offer the biggest range.

Good to see the honest dyno chart too, the 80kw is exactly what I would expect rather than the 160hp quoted by one US tuning company who just measured theirs.

Go HKS, it looks great

[Tradewind]

Originally Posted by djdnz

I'm worried about the tuning solution, given my unpleasant experiences with trying to tune my NA car which I went turbo on.

Providing its been tested at 95 f temp and no engine failure then its good, so far all the vids seem to be taken during snowy, rainy conditions which are the best conditions.

Give it some REAL heat and average fuel and see then if the tuning solution is good.

[Tradewind]

HKS will have already thrown some HUGE $$ at this BRZ/86 task. Be interesting to know what they have to recoup

[86purity]

Originally Posted by uspspro

The Rotrex has so many good points. Sure it won't make the mid-range punch of a properly sized turbo, or the off-idle torque of a roots/twin screw, but it has several things going for it. I had one on my MR2 Spyder for a good while, before I went with the 3.5L V6 swap.

1) It's quiet. They use planetry rollers with traction oil, instead of gears. So there is no gear whine like other superchargers. I view this as a plus, I like the sound of the engine not to be drowned out by the SC. It will make the engine quite a bit louder and more "serious", lots more induction sucking sound and louder exhaust. The sound is awesome, and this is a huge plus IMHO.

2) It is reliable. Self contained oiling system with oil cooler, reservoir and filter. Alll of the components are compact, and can be installed easily. Rotrex is also the OEM supercharger for the Koenigsegg ccx (although they use two of them)

3) The boost ramp is much better than typical centrifugal blowers. The planetary rollers, high gear ratio, and well designed compressor housings allow the boost to ramp up quickly.

4) The use of restrictors. You can place a restrictor on the compressor inlet, which allows a maximum air flow, thus limiting the maximum boost. This allows you to use smaller SC pulleys to spin the SC up to higher boost numbers at lower RPM, but not have some stratospheric max boost. For my build, I used forged 9.0:1 pistons, so I did not use a restrictor and boosted up to 17psi. However for a stock bottom end with high compression, the restrictor makes perfect sense. Imagine a pulley capable of delivering 15 psi at redline, but with a restrictor keeping it at 8psi instead. You will probably see that 8 psi pretty early in the mid-RPM range and then it will hold that boost level. HKS has information about restrictors.

5) Packaging and heat. The compact packaging allows for good placement in the engine bay, and makes it easy to install an intercooler. Also, the SC produces MUCH less heat than a turbocharger. This leads to a more reliable setup: Easier to keep temps in check, less "baking" of engine bay components, better intake air temperatures.

I think a 250 rwhp Rotrex kit would be perfect for this car, IMHO... And, if they so chose, power-mongers can change out the restrictor and pulley along with a built bottom end and go for 350+

Very informative! Just about what I was thinking! The SC seems to make more than I expexted (75whp) with the high compression. This would be plenty for street use. I'm a bit of a purist, and NA is so visceral, so I may go with a top end build from Cosworth when they have it available. I could do the SC myself though. Tempting!

[wcbjr]

【HKS Racing Performer 86】 GT Supercharger spec test run - YouTube

[wcbjr]

10:50 mark for shots of the supercharger that we have already seen

[ESBjiujitsu]

can someone translate if any good info is being shared? thanks

[Tradewind]

Can customers have air conditioning and supercharger together? Can't bear the though of no A/C in this day and age

[ichitaka05]

Originally Posted by Tradewind

Can customers have air conditioning and supercharger together? Can't bear the though of no A/C in this day and age

Yes, that vid cleared out that question.

In the vid SC is for public, stock engine SC kit... which equal to yes on AC.

[gearheinz]

ive installed many turbo and SC kits, and in my opinion HKS is by far the best for many reasons. let me list the ways.
1. fitment is great. small amount or no molestation to the chassis and body parts. some kits require you to cut this, notch that, whole saw here..... who wants to cut up their brand new car. they also cast alot of intercooler piping pieces to fit into small areas. this reduces the number of intercooler pipe and silecone couplers you have to use (less chance of one poping off).
2. parts last very long. Most of the SC brackets are casted with supports in them to reduce vibration. this will in long term extend the life of bearings and belts.
3. although their bolt-on kits arent rated at high hp, the power band is very strong. so if your daily driving it feels like twice the ponies
4. all hardware included in their kits are top notch. fitting are usually steel, not brass pluming ones from the hardware store(that some companies use. rubber hoses and vacuum line have a thick wall thickness so they dont bind around tight spaces. oil feed and return lines are made specific for every application, some companies provide you with 2 fittings and 10ft of coolant hose and have you make them your self.
5. install is straight foward with good instructions(lots of pictures)
6. never have to remove AC or PS
7. quality control is great! never parts missing or broken.

all in all, if your looking for a FI kit to get with the least amount of headaches, HKS is the way to go. the extra money spent is worth it






here is an example of the HKS Nissan 350Z and Honda CRZ kit.

[CoRi J]

This will be my biggest project to save up for!

[Tradewind]

Has the SC kit for the 86/BRZ been tested for use at high temperatures, is it good for sustained operation in 90F + ambient temps?

[catharsis]

Originally Posted by Tradewind

Has the SC kit for the 86/BRZ been tested for use at high temperatures, is it good for sustained operation in 90F + ambient temps?

if its intercooled it should be fine imo.

[Draco-REX]

So very tempting.. If Subaru and Toyota decide not to do anything with this chassis when I'm ready to trade in, this will likely be the route I go.

[86purity]

I really can't see the kit making more than 250 crank HP due to the high compression of the stock motor unless the dyno run included a reworked exhaust. 250 is fine though. Probably just right for this car. If you want huge power just get an STi.

[wcbjr]

drop the compression to 10:1, add in 7 psi, and you get exactly 250hp.

[Bahraini86]

I the issue here is the limitation of the DI system, not the compression. Can't see a budget way to make the DI work effeciently at higher boost!

[WingsofWar]

Originally Posted by Bahraini86

I the issue here is the limitation of the DI system, not the compression. Can't see a budget way to make the DI work effeciently at higher boost!

When it comes to boost, DI actually supplements the fuel needs of the forced air. So its actually not a limitation especially as a D4-S applications.

I think the biggest mistake people are going to make when boosting this car is lowering the compression to accept more boost to the point where the DI becomes useless. DI's biggest advantage is providing a weak stratified mixture at all loads and still provide the necessarily homogeneous fuel mixture for TQ and performance. But to make DI work properly is using that high compression and piston swirl shape. To compensate we would need change the injection profile and cycle somehow to retain that homogeneous mixture otherwise it would be just shooting way to lean to warrant any benefits.

But any mistakes can also be masked by increasing the flow to the port injector.

We arn't anywhere close to maxing out DI injectors..and the port injectors still provide good intake fuel certain loads and boosting anywhere from 7lbs-12lbs on a appropriately sized turbo, sounds pretty good using factory parts with a marginal tune no more invasive than a simple timing and fuel correction at the start of powerband.

If we are looking at boosts around 15lbs-20lbs, or upwards of 30lbs...there is no cheap way regardless of any direction you look to support those numbers digitally and physically.

[86purity]

DI certainly lessens the dangers when it comes to boosting a high compression engine. I suppose the limits still have to be explored as DI is relatively new. As far as the D-4S system goes, using those two injectors in concert should be a major advantage in tuning. The need to upgrade to larger injectors should be much higher in the tuning process as opposed to single injector setups. I'm really, really curious to see what happens when a company like Cosworth throws every trick in the book at the FA20 head! That high compression and D-4S system may be a blessing in disguise when it comes to building a NA beast motor!!