HKS GT Supercharger (Rotrex) in development!

[serialk11r]

sigh, bolt on SCs usually have bypass or clutch, they do NOT affect fuel economy.

[ForReal-Someday]

There's a pretty noticeable kind of throbbing noise in that video. It sounds kind of like when you run over expansion joints in the road. Is the noise in the video from the tires going over joints in the dyno barrel? Or is it something in the engine department?

[DanPO]

HORRAY!!!!! OK I am totally sold on this car!

[DanPO]

Here it is:

Shell oval type muffler only the main plan in April (shape genuine)
Shell oval type muffler with middle main + plan April (shape genuine)
With intermediate main shell type muffler + scheduled Mon 4 shells
Metal catalytic converter exhaust manifold development plan
Suspension
Damper will HIPERMAX month (street type) 4
Damper will be Mon HIPERMAX (Circuit type) 8
Intake
Mon Racing Suction Reloaded 4 plans
Mon 4 plan premium suction kit
Mon SUPER HYBRID FILTER 4
Electronics
VAC development plan (SLD)
Development plan FLASH EDITOR
Cooling
Oil cooler kit will be developed
AT fluid cooler kit will be developed
Supercharger
GT SUPERCHARGER setup kit will be developed
Fuel
Large-capacity fuel pump to be developed
Injector capacity development plan
Engine Parts
Metal Head gasket kit will enhance the development
Camshaft development plan
Forged Piston Kit to be developed (for NA & SUPERCHARGER)
Development plans strengthening connecting rod set
Forged piston kit full development plan (up kit exhaust volume)
Power Train
LA Clutch Kit will be developed
Sequential transmission development plan
Oil and oil filter

[SVTSHC]

Originally Posted by blur

@ SVTSHC

It's a rotrex style centrifugal supercharger. So fuel mileage would remain unchanged with a setup like this? What kind of psi setting would give the best MPG?

Well truthfully the best fuel mileage is produced when the car isn't boosting. Centrifugal blowers only make boost under load (I.E. during spirited driving, uphill climbs, trying to pass another car, flooring it for the sake of flooring it), so under normal driving conditions when you aren't being an animal with the throttle you'll get the same fuel mileage you did when your vehicle was NA.
So essentially the rules with a centrifugal blower are the same as without one when you're boosting (or in an NA vehicle, driving WOT or almost WOT) your vehicle compensates with additional fuel; with a centrifugal blower that's when you take the hit.

The only reason people typically claim they've lost fuel mileage is because... well.. who supercharges a car without "spirited" driving in mind lol.

[SVTSHC]

Originally Posted by DanPO

HORRAY!!!!! OK I am totally sold on this car!

Likewise bro

[Dimman]

Centri on small motors are meh...

[serialk11r]

Originally Posted by SVTSHC

Well truthfully the best fuel mileage is produced when the car isn't boosting. Centrifugal blowers only make boost under load (I.E. during spirited driving, uphill climbs, trying to pass another car, flooring it for the sake of flooring it), so under normal driving conditions when you aren't being an animal with the throttle you'll get the same fuel mileage you did when your vehicle was NA.
So essentially the rules with a centrifugal blower are the same as without one when you're boosting (or in an NA vehicle, driving WOT or almost WOT) your vehicle compensates with additional fuel; with a centrifugal blower that's when you take the hit.

The only reason people typically claim they've lost fuel mileage is because... well.. who supercharges a car without "spirited" driving in mind lol.

Replace centrifugal with Roots and it's actually the story, because they all come with bypass valves. Electrically activated clutch would be slightly better, and clutched twin screw compressors would also suffer no parasitic loss. Twin screw Lysholm compressors will consume a small amount of energy when being spun with no load though.

The difference is under load, a centrifugal supercharger has slightly better efficiency.

[MarkRacerX]

Originally Posted by YeloFva

What's up with the picture of the ITB's?

That's for 4AGE engine it looks ( AE86 )

[Homemade WRX]

and I laugh to when I said I was going to develop a Rotrex based kit for this car and everyone jumped on my throat about the spirit of the car and soul of the engine mumbo jumbo

[TRD_07]

Anyone have an idea of how many extra ponies would it add? Awesome post btw!

[madfast]

i'd still wait to see if anyone can develop a roots TVS or Lysholm SC before i jump on the rotrex bandwagon. rotrex is still a centrifugal, so you still have to make the same compromises.

[Moshpit37]

Awesome! Supercharger > Turbocharger in my opinion. Everybody's been asking about a turbo it seems lately; thanks HKS for giving hope for the SC fans!

[Foonix]

Originally Posted by SVTSHC

Well truthfully the best fuel mileage is produced when the car isn't boosting. Centrifugal blowers only make boost under load (I.E. during spirited driving, uphill climbs, trying to pass another car, flooring it for the sake of flooring it), so under normal driving conditions when you aren't being an animal with the throttle you'll get the same fuel mileage you did when your vehicle was NA.
So essentially the rules with a centrifugal blower are the same as without one when you're boosting (or in an NA vehicle, driving WOT or almost WOT) your vehicle compensates with additional fuel; with a centrifugal blower that's when you take the hit.

The only reason people typically claim they've lost fuel mileage is because... well.. who supercharges a car without "spirited" driving in mind lol.

Pretty much %100 correct, but, from the parts list they mention they are developing forged pistons for the kit. That alone wouldn't drop mileage, but if they lower the compression (which makes sense for a SC) that might affect the power output for a given amount of fuel at mid throttle, which trickles down into worse mileage.

But more importantly, I think, is it is awesome to see options opening up and the car is not even out yet..