ouch that's a lot of american green backs for a supercharger kit..granted it is HKS (hence paying for the name and reliability)..but damn....then you have to pay to install it...what is the greddy kit like 3g's? hmmm i do like how it looks and sc may be the way to go.....but i can get the greddy and rebuild my engine in 100k miles when it goes for that price...ahhhhh hopefully it will be less (everyone cross your fingures)

 

thanks Mom

 

:p Mom's are always so supportive!

 

You know it's not good sign when future pastor's go around jacking superchargers for their RX8s. lol

 

everyone please keep your first born away from him!

 

Why not get the HKS exhaust before the Hipermax coils XDeed? I would usually get the springs/coils after I get new rims to see just how much I would like it to drop.

 

That Loooks really good. I love the new intake Manifold.

 

i know i pondered the same thing...But i'm getting a real good deal on the coilovers. It was an offer I couldn't refuse! But after i get the suspension installed rims would come next...Then eventually the exhaust... =)

 

Autodelta is also using the Rotrex Centrifugal Supercharger on the Alfa 156 GTA and on the Alfa GT .

The question is whats the best type of Supercharger for the rotary engines characteristics.

A TWIN SCREW TYPE SUPERCHARGER OR THE ROTREX CENTRIFUGAL SUPERCHARGER ???

cheers
michael

 

Uh, no and no.
Not only will a centrifugal not come on sooner, it can only produce boost at low RPMs as a function of the maximum boost at top RPM.
I've done both and they are quite different.

Plus, CARB certification doesn't care how the air gets in there, only how cleanly it comes out.

Its aluminum so that the extra injectors can be mounted more easily.

 

Okay mazdamaniac...since you are a genius and know everything, maybe you would like to write to hks directly...like i said i have very little information about the new product. I was just informed briefly about this so keep your immature emoticons to yourself...

 

Immature? He is correct. This supercharger is going to pretty much suck on a rotary. It makes a lot more sense on the Z.

 

Whether I'm a genius or not has nothing to do with whether I'm right or wrong.
If you don't agree with what I stated, then refute it.

I surely don't know evertything. If I did, I would have known not to bother responding to your thread - knowing that you are such a blowhard.

 

I can't see myself spending 7k if the sc unit came out to be that much

 

I don't even wanna know the price..The exhaust is like $899 and thier intake is like $599..HKS is hella expensive..

 

I am simply here to report on the product not to debate or argue with you. I am not going to waste my time with you any longer..

 

As far as the Greddy kit goes the retail price is about $4200. Anything cheaper than that would be a street price...Now this is just an example: If the HKS kit had an MSRP of $7250, the street price would be under $6K. Now this is just a rough guesstimate...

 

Then why did you start and argument that you won't finish?

 

you pay for what you get..and you get quality...

 

Suck on the rotary? Thats an early judgement don't you think. There was a lot of R&D spent on this kit and HKS is not going to put out crap.

 

well, what xdeedubbx said wasn't entirely untrue, twin screw's have flat boost curves, and come on sooner than a turbo (jeff step in if necessary, it's been a long day). however a centrifugal is just the compressor side of a turbo spun by a belt connected to the e-shaft. unfortunately a centrifugal SC lacks any means by which to "bleed" the force of the belt turning it (whereas a turbo opens the wastegate once desired boost is reached), so it can only make target boost at max rpm. if it reached 5psi at 4500 rpm, then it would be 10psi at 9000 (the boost curve may not be linear, but you get the idea). you cant just bleed off the excess boost, since you'd loose alot of metered air and it would be a tuning nightmare, as well as terribly ineffecient.

HKS is a great company, and i'd pay $7500 or whatever if it was a turbo kit. i also don't like the fact that SC's pull the bearings to one side and rob power to make power. SC's are one thing, but a centrifugal is probably the worst option for this engine. it would probably turn a decent 1/4 time since there's no boost down low to make launching any more of an issue and plenty of power up top, but on a road course or daily driving it'd be a chore. of course only numbers and facts will tell. perhaps HKS has something up its sleeve...it is a gorgeous piece of hardware!

thanks for the heads up though man, i always love to see new things!

 

I don't think anyone is saying the kit is crap.
In fact, it will probably produce the highest peak HP of any of the FI kits that will be available in 2005.
It will also likely be the most blingy kit you can buy and I mean that in a good way.
However, the area under the power curve will be significantly less than a properly sized turbo or even a positive displacement supercharger running less boost. That is just the nature of centrifugal SCs.

 

I'm also awaiting Rotarygod's response into this thread... then my head really starts spinning with all the facts and details.

As far as I know, "MOST" RX-8 owners will use their cars as daily drivers... owning a SC or Turbo Kit for the RX-8 for daily driving is a joke. :P Unless you have money to toss Or/and plan to go track racing or something, there's really no reason for it. Save your money, go buy a faster car if that's what you are looking for.

My friend's 1998 Civic would still kill my car because all he wanted to do was increase the speed... make it super ricey. In the end, which car do you think most people are impressed with on the road? The RX-8, styling and profiling... or the Civic which has no back seat, rollbars, and driving on the 405 Freeway traffic going 10mph.

 

Hey now.. My RX-8 is a daily driver. Having the turbo in it I don't see any sacrifice in daily drivability at all. WHen the turbo kits in, you feel it in the kidneys, but you learn to drive around that as long as you massage the throttle and keep it under vaccume.