HKS version 2 R&D supercharger - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Evasive Motorsports · 06-03-2014, 11:55 PM

We are working with HKS and testing the new version 2 supercharger. More info will coming after all the testing is done.

D K · 06-04-2014, 12:29 AM

Is this a draw thru MAF setup?

BongMan · 06-04-2014, 12:40 AM

@D_K Looks like it uses the stock air box, so i'm going to say no.

Will this bad boy be carb legal? We need updates, it's almost been an hour!

ichitaka05 · 06-04-2014, 12:49 AM

Oh~ interested to see how well it perform.

...at the same time, I'm interested if they gonna release twin charger ver
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Sent from my mighty mind

Dezoris · 06-04-2014, 01:03 AM

Looks like another Rotrex kit but lack up content makes this a big boner kill.

D K · 06-04-2014, 01:09 AM

I'm interested in seeing *which* Rotrex this is based off of?

I know the first series was based on a Rotrex design that Rotrex binned. They felt there were reliability issues.

Hopefully the newer ones are based off of more current Rotrex designs.

D

darthwong1138 · 06-04-2014, 01:14 AM

Pics of intercooler please

Calum · 06-04-2014, 05:07 AM

Quote:

Originally Posted by D K

I'm interested in seeing *which* Rotrex this is based off of?

I know the first series was based on a Rotrex design that Rotrex binned. They felt there were reliability issues.

Hopefully the newer ones are based off of more current Rotrex designs.

D

Got any more details on that?

D K · 06-04-2014, 05:26 AM

Quote:

Originally Posted by Calum

Got any more details on that?

Thats about as far as Im gonna go on that

marcoaferrer · 06-04-2014, 10:09 AM

This new setup has a few advantages over a rotrex kit. This new transmission is built to have less parasitic drag.

Quote:

Originally Posted by motokev

I have seen preliminary data and goals for this kit however, until we install and tune the kit on our vehicle here in America I won't speculate.

I will say I don't see an issue hitting the 300 whp goal.

In addition I am very familiar with Rotrex. Actually, I was quite involved with kit development using the unit on American vehicles around 10 years ago. Upon study of the Rotrex verse HKS unit I can say it's not always about power output although, all the data I have seen leaves me splitting hairs in regards to power comparisons. Both units boast efficient maps, charge temps, and higher impeller speeds but, 3 major changes HKS made to their design make a big difference in a few areas.

Change 1- Increasing the diameter of the impeller shaft. (2mm iirc)

Change 2- Using more than one bolt to mount the supercharger pulley opposed to Rotrex using one bolt.

Change 3- Reducing parasitic drag by spring loading one of the planetary wheels.

Change 3 might be a little confusing so I'll explain. If you look at the attached image you can see a small spring and shaft assembly to the right of the impeller shaft. The addition of this spring allows wheel tension to release during engine idle while progressively ramping up pressure on the impeller shaft to aid slippage during high boost levels.

Personally, I experienced issues with the Rotrex units during my development work directly relating to the HKS changes to their design. I can say they are definitely a step in the right direction for increased strength, longevity, and a more efficient unit. As usual, any of my opinions are quite objective.

xwd · 06-04-2014, 12:02 PM

Not to derail the thread but the twin-charger setup is kind of ingenious the way they routed everything. The turbo (which looks tiny) feeds directly into the supercharger inlet. I was always curious how well that would work and how efficient the S/C would be at compressing the already compressed air, but apparently works well enough. Have to lose the A/C though so I'm not sure they will make this as a production kit.

Eightysexy · 06-04-2014, 03:47 PM

In, for more info.

D K · 06-05-2014, 01:10 AM

Are you saying the new HKS charger has less parasitic drag than the Rotrex?

D

Quote:

Originally Posted by marcoaferrer

This new setup has a few advantages over a rotrex kit. This new transmission is built to have less parasitic drag.

marcoaferrer · 06-05-2014, 09:20 AM

Quote:

Originally Posted by D K

Are you saying the new HKS charger has less parasitic drag than the Rotrex?

D

Yes and no lol, it has less parasitic drag at lower rpms. The transmission is designed to transfer all of its rotating force to the impeller once there is enough centrifugal force. Sorta like an oldschool brake drum. At least that is how it is explained by @motokev in that post.

EDIT: ^^^ I made a stupid typo

06-04-2014, 12:49 AM	#4
ichitaka05 Site Moderator Join Date: Oct 2009 Drives: ichi 86 Project Location: Middle of No where Posts: 20,966 Thanks: 7,664 Thanked 19,052 Times in 8,327 Posts Mentioned: 677 Post(s) Tagged: 27 Thread(s)	Oh~ interested to see how well it perform. ...at the same time, I'm interested if they gonna release twin charger ver Sent from my mighty mind __________________

06-04-2014, 01:03 AM	#5
Dezoris Senior Member Join Date: Aug 2012 Drives: FR-S Location: IL Posts: 2,857 Thanks: 519 Thanked 2,997 Times in 1,095 Posts Mentioned: 159 Post(s) Tagged: 1 Thread(s)	Looks like another Rotrex kit but lack up content makes this a big boner kill. __________________ SAVAGEGEESE

06-04-2014, 03:47 PM	#12
Eightysexy GBC [HI] Join Date: Jul 2011 Drives: Haole FRS Location: Hawaii Posts: 159 Thanks: 16 Thanked 20 Times in 13 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	In, for more info. __________________ CarPriest.com

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06-04-2014, 12:29 AM	#2
D K Stig's dark passenger Join Date: Dec 2013 Drives: FR-S Location: I work abroad Posts: 724 Thanks: 60 Thanked 316 Times in 186 Posts Mentioned: 20 Post(s) Tagged: 1 Thread(s)	Is this a draw thru MAF setup?

06-04-2014, 12:40 AM	#3
BongMan Member Join Date: Apr 2013 Drives: FR-S Location: California, Bay Area Posts: 26 Thanks: 2 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	@D_K Looks like it uses the stock air box, so i'm going to say no. Will this bad boy be carb legal? We need updates, it's almost been an hour!

06-04-2014, 01:09 AM	#6
D K Stig's dark passenger Join Date: Dec 2013 Drives: FR-S Location: I work abroad Posts: 724 Thanks: 60 Thanked 316 Times in 186 Posts Mentioned: 20 Post(s) Tagged: 1 Thread(s)	I'm interested in seeing which Rotrex this is based off of? I know the first series was based on a Rotrex design that Rotrex binned. They felt there were reliability issues. Hopefully the newer ones are based off of more current Rotrex designs. D

06-04-2014, 01:14 AM	#7
darthwong1138 Member Join Date: Jul 2012 Drives: Raven FR-S Location: Redondo Beach Posts: 71 Thanks: 17 Thanked 21 Times in 10 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Pics of intercooler please

06-04-2014, 12:02 PM	#11
xwd Senior Member Join Date: Feb 2012 Drives: 2013 DGM Subaru BRZ (Subie #9) Location: ATL, US Posts: 2,667 Thanks: 123 Thanked 860 Times in 552 Posts Mentioned: 32 Post(s) Tagged: 0 Thread(s)	Not to derail the thread but the twin-charger setup is kind of ingenious the way they routed everything. The turbo (which looks tiny) feeds directly into the supercharger inlet. I was always curious how well that would work and how efficient the S/C would be at compressing the already compressed air, but apparently works well enough. Have to lose the A/C though so I'm not sure they will make this as a production kit.

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