swiftrx8

Hey, I ran across it today at Mazdatrix.com

http://www.mazdatrix.com/8forcedinduction.htm

The stage 2 (which anyone would want) is running $8K. Pretty steep, I like the kit a lot, it dosen't put the power down low but it seems to be a pretty simplistic and reliable design. Too bad it wasn't around the $5K mark

I've seen pretty much the same kit for other vehicles (350Z and Integra) for$6K but I guess not for the RX-8. Good idea but I just don't think it can be competitive at that price.

MazdaManiac

iTrader: (3)

A centrifugal supercharger is the wrong choice for an engine like the Renesis that has a large dynamic range and a fairly steep HP line.
A centrifugal will simply amplify the slope of the HP line and provide very little power in the lower RPM range.

mac11

iTrader: (1)

It should be of concern that the radiator is blocked by the I/C

mac11

iTrader: (1)

Not only that but it will more than likely produce LESS power than a factory n/a car up to a certain point. On the Dyno graph provided it looks like that point is ~60-80KPH

swiftrx8

I like the mounting location and the fact that it has self-contained oil. I just think it's a good design but you guys are right about the power band. Some people like that though, a huge boost in power at 5-6K rpms, it does keep a pretty linear power curve though. It's probably better for daily driving but it just seems too expensive for the benefits to the renesis. I will say that it tooks to be one of the easiest installs of any FI kit.

mac11

iTrader: (1)

I have to disagree with you. I think it would be worse for daily driving. In your lower RPM's you are using the motor to spin the s/c yet you are not receiving any power from it. At that point all you get is a parasitic loss and no gain. A twin screw s/c or appropriately sized turbo will be a better choice on a daily driver.

If it is extreemly efficient from 6-9k this would be a good choice for a track only (or mostly ) car but you could just do a larger turbo for that application as well.

I also don't really understand the implication that this pro charger can somehow deliver more cfm of airflow without increasing the pressure ratio. It somehow defies the laws of physics.

swiftrx8

From the standpoint of less airflow at low rpms would require less fuel. I'm assuming this would result in better fuel efficiency (compared to other FI). I guess for the small passes it wouldn't be good but most of the time you get on the car it's going to be above 5K rpms anyways. (My theroy is if I don't have power down low, I won't speed around and get on it a lot unless I'm down some backroad and really get on it) I agree a larger turbo would put out more power and be cheaper but like I said it's pretty hassle free and easy to install. All in all like I said I think it would be a good deal if the price tag was around $5K. I'm not going to jump on this kit, from the looks of it the hymee or aflow kit will be a better buy.

MazdaManiac

iTrader: (3)

That IC is barely blocking the ad since it is so small.
My IC completely blocks the rad and my cooling concerns have been mostly caused by total flow through the engine bay, not just the presented area.
In 110°F ambient temps, 6% humidity and full boosted power, cooling is an issue, but addressable.
In most "normal" places, it won't really be a problem if the entire cooling system is addressed as discussed in numerous places on this site.

Its a trick of adiabatic efficiency. The implication is that it is somehow above the nominal 75% or so of a typical turbo.
I don't think this is actually the case, however.

tajabaho1

this thing looks very simple and should be easy to install, but am I wrong or does the low end power look worse than a stock rx-8?

also, 247whp for 7k?

mysql101

yes, a stock rx-8 would whoop it's *** under 5k rpm.

tajabaho1

first time I am right.....then wtf......... this kit doesn't make sense

Jedi54

iTrader: (7)

yeah, I'm saying "NO" to this kit already. I just dont' see the logic behind such a system on a Rotary! I tried asking these questions at SS but I got the "deer in the headlights" response from the Mazdatrix ppl.

1stgen8

iTrader: (1)

I'm sure whoever buys one will get the same response if they run into a problem. Does the word "Greddy" come to mind.

mysql101

I haven't heard anything bad about the Mazdatrix people. Don't put them down unless you have concrete issues to tell us about.

Razz1

Hell I thought they told me 274 ponies...

With RB race flash or Cobb flash we can get near 225 HP

7k plus install is not worth 20 more HP.

Jedi54

iTrader: (7)

I'm not putting them down at all. Heck, those guys are only 15 minutes from me and have been great in the past. Just when it came to asking questions at SS....

rotarygod

No one is saying anything bad about Mazdatrix. Centrifugal superchargers on small high revving engines on the other hand...

swiftrx8

The 10lb pulley buts down 303whp (stage 2 kit)

tajabaho1

I bought a flex plate from them, they were really nice and the guy knows the part number like the back of his hands or something..........

however, this supercharger just doesn't make sense to me.........fail

mysql101

yeah, you should be able to do 300 on that kit, but it just happens to be 300 whp that aren't as useful as 300 whp on other kits

tajabaho1

so the stage 2 (8k) for 300whp? where teh dyno....

Cody Red

it's on 'teh' site.

Kal-el

ok, this one is right up my alley since my last car before the 8 was 1993 mitsubishi 3000GT (SL) .... yes, I waded thru with that car for over 6 years with all the jokes, the continuous beatdowns from 4cyl eclipses/toyota camrys etc etc etc. even a grand am GT schooled me... blah blah, but I did get a centrifugal unit put in my car, granted the 3.0 is big V6 compared to the renesis, but I'd say torque wise they were close as mine was only giving around 170LB... what I had was a total devastation of hope below 3000rpm, car was still as slow as before, but when going after 45-50 I'd get a rush of power that was undescribable, so I understand how this mod works, it's not for low end but will increase your acceleration from a certain point, a twin screw would be better, granted I am comparing two different animals here, but I'd expect this mod to work similar in any situation, besides mine only gave me around an extra 54hp according to dyno in 2001, I was gonna go forged pistons/rods and all of that but then I saw the 8... had to get it, will never go back to FWD, even though I am on my 3rd set of coils on this thing in under 60k miles

dynamho

Just out of curiosity, isn't the centrifugal supercharger essentially a belt driven turbo? If so, from a theoretical standpoint, wouldn't it be possible to emulate a fast-spooling turbo by manipulating the gear ratio and the wastegate threshold?

Astral

10psi dyno shows horsepower always above stock (and thus torque as well). The lower-than-stock low-end torque at ~5K is with the 6psi kit. 8psi dyno doesn't list the stock HP directly, but if you look at that 5K RPM area, it's definitely higher than stock.

One of the Mazdatrix guys (@SevenStock) said that this kit is essentially "invisible." The torque curves are similar to stock, you just have more power. Also he said that if he had to do it again, he could probably install the entire kit in 4 hours (and the install doesn't require lifting the car).

So, a supercharger kit that feels stock, but with more power, with an uncomplicated install, and delivers a 70% increase at 8psi is not something that I would qualify as "fail" or "does not make sense." Plus it's available now.