Hey guys - check this out .......


http://www.dnamotorsport.com/ProChar...8_Kit/RX-8.htm

http://www.rotormaster.com.au/subPage.asp?cid=50

 

Yeah is been around for a while. I dont even think anyone on this board has one.

 

I'd like to here one on a RX8 the procharger on my mustang flat out whines. Does anyone on the board have this system?

 

actually - I was meaning check out the pricing & the new stage 2 kit available

 

urls look like turbos...

 

they are claiming up to 95% more hp with stage 2 . By my calcs that around 350whp !!!!

 

Hmmm. They put "turbo" under the badge even though it's a supercharger? A "S/C" would be more appropriate me thinks.

 

yeh - thats been picked up before - they originally did a turbo . Can't have a very good proof reader for thier advertising!



BUT - did you get that - 350 HP

I'll say it again - 350 HP !

 

You guys do understand that centrifugal blowers only reach peak boost at redline right? that totally negates the point of putting FI on a rotary, as it will only make the torque curve peaky

 

yes - low down won't be as good but for outright acceleration 6-9k range there won't be much difference with turbo car puting out 300+ odd hp .

Edited

 

Maurice (Canzoomer) had one of those ProChargers on his '8 in 2004.

....after much experimentation he took it off. He was working with some Arizona dealer who wanted to sell them as a package on new cars.

During his experiments, he decided to use an electro-clutch to disengage it at low revs - found they were mostly made by Bendix, engineered the qualities it would need and the size it would be, then got quotes from them for the exact size/specs he needed. They said that size was a common one, because Mercedes use that model on some of their "Kompressor" models! DOH!

S

 

that will really drag a small, no-torque engine like the Renesis down at low rpms until the boost starts kicking in, the problem with high rpm engines is this style SC has to have it's internal rpm limit matched to the engine rev limit to prevent spinning it too fast, then it is turning too slow at low rpm to make any boost

look at the low rpm end of the TQ curve in their dyno graph:

 

^ good point.

they're showing whp + vehicle speed, instead of whp + rpm.

If the stock car makes 80 whp at 3,000 rpm, you might end up with 40 whp due to dragging around the SC.

 

Revolver & Timbo from the Aussie site both drove it & reprted that it was pretty much like stock in the low rpm range .
Maybe it will lose a little - but hey this is a production supercharger producing excellent power that is available now .
You have to give them some credit for that ......

 

the steepness of their curves and intersection point relative to the OE curve indicates otherwise that's their literature ...

 

I must say that for so called rotary experts i believe they have used the wrong type of Supercharger , a Twinscrew type would have been way more effective especially downlow in the power range were its most needed

Michael

 

centrifugal blowers are a waste, all the parasitic loss of a blower with more lag than a turbo...

i suppose if you had a race car with very very close gears it wouldnt matter...you'd just need 30 of them to keep the rpm's usable.

 

Can't see that - HP & torque are significantly higher than stock in the 6-9k rev range , which is where you are most of the time when racing.
This setup with 350hp is going to be as quick as a turbo with around 50 hp less up top - it's the area under the graph that counts right ?

 

so where are these twin screws ........ waiting waiting
As you can see from my avatar I'm a AFSC fan but thats not out yet either ... waiting waiting
I hope i'm not going to grow old waiting.

Last I heard there were over 20 of these running around in
Aussie (probably a lot more)

 

interesting that the stage 2 kit includes headers also. i did not see that before.. would love to see what they look like..

beers

 

Joe claims 7kw from his headers for NA cars - I keep asking him for a dyno ........

 

i know hymee said he had found some gains, you got photo?

beers

 

Hallo over there !! I have an Rx-8 which I made to a "Racecar a`la Rx-8" and this winter I will build in DNA Supercharger 8 PSI. I`m conviced the supercharger is better comparied to turbo because of the heat the turbo produce. Running the car 3 , 6 , 12 hours race and the turbo is dead. As soon as I have some diagram I will present them for you.

 

While that is a good example, it is unrealistic. Even a twin-screw won't drain 40hp at peak boost, so a centrifugal that is running outside its boost curve won't be draining huge amounts of power.


I don't know, it might be personal preference. But I would like a torque curve that continually increases all the way to redline, it would allow you to better take advantage of the gearing at high rpms.

 

You can't simultaneously make a claim that power increases between 6 and 9k are acceptable and that you have a greater area under the curve. you have to look at the entire torque curve.

the only curve that counts is the torque curve. hp is actually the area under the curve from 0-X rpm (not quite, but you obviously know calculus so you know what i mean). and the slope of the HP curve is torque. while yea, gains from 6-9k are alright for racing, you're still going to have a sloped torque curve at the point, which only leads to a more sloped hp curve. if your particular setup can support XXXft/lbs of torque, and you only had that at exactly 9000 rpm (ignorning airflow properties of the motor here), you would get beat by the same car that had the same torque at 3500 rpm and held it to 9000 rpm.

and yea, i know the greddy kit doesn't do that, but there are turbos that can hold boost and torque all the way to 9000. Procharger's photoshop dyno graph doesn't really show you much, but look at my own dyno: http://home.cfl.rr.com/epitrochoid/rx8dyno.jpg

If you look at how the torque comes up and peaks at 3500, and holds [fairly] level to about 5.5K. The drop off after is from an undersized turbo, but in most properly set up turbo cars that stays fairly level (take a look at mazsport's stage I turbo dyno, and you'll see). This gives useable torque at nearly all RPM's, not just 6-9