i would like your guys opinions on a good super charger systym for the rx8 which you think is the best and so on, feel free to provide pictures hope this thread is helpfull to you guys




Excuse my grammer

 

ask again in 2-6 months when there are some actually available for us to buy.

 

im still waiting on richard pauls!

 

Do a search. There are two main groups out there working on a S/C for the 8. Petit and Richard Paul with his Axial Flow Super Charger. Both have many pictures. Both have large threads on this forum. Search and you shall find...

 

Don't forget Hymee...

 

Don't forget about the Blitz S/C. It's currently on sale in Japan and there is always a kit for sale on ebay.

 

The answer is : Rotormaster . Because its better than Blitz & is the only other one that is actually on the market.

 

I want the AFSC (RP's)...We've been waiting so patiently and it has /so/ much potential.

 

those threads are sooo long. hahaha im waiting on axial flow

 

I'm looking at the RP too. Everything that guy makes seems so...cool! When is that due to come out btw? Any guesses on price?

*sorry...but it's "grammar" not "er."

2 cents.

 

it will be done when it is done right..

price, rp goal is to keep it affordable.. i think his target was 4k.. but the rules change.. this is to be to make the car more fun.. more power, not a 400 hp tuner deal..

if he can pull it off for 5k and pay the bills he has done a great job for everyone...

beers

 

That's the centrifugal supercharger right? No thanks. A Greddy turbo kit can be had for as little as $1750 now and probably run circles around it on the street. I'm not even a Greddy fan and I do like superchargers. Just not centrifugals.

 

Where?! I ask cause all the turbo kits I see on the net are CRAZY priced. Well over $6K.

 

Ask Brillo. He knows.

 

i was reading a post earlier that said centirugals actualy slow you down at the low end in a rotary, and only get max hp whne you peak in rpm's is this true?

 

I think there is a misconception with cetri blowers, they may rob a few hp with the initial WOT until boost is reached. Which is expected since the belt has to drag the pulley around. It is most likely not noticable and generally they will produce a greater peak HP then a roots type blowers once they get wound up. Bottom line is your going to freight train a stock RX-8 once you get into the boost. One more thing to think about is a roots blower kicks in almost 100% from WOT which might give you traction problems, and once a turbo spools you might get a sudden HP surge which = traction problem. A Centri builds boost lineraly, so you wont have any sudden jolts of power.

Here is a dyno sheet from my centri blower. The TQ and HP lines are very linear and smooth with no sudden dips or jumps.

 

I don't like centrifugals either. Twin screw baby!

 

The RP Axial Flow SC would be my choice. In addition to what Swoope said, It should be easy to install yourself. There is no intercooler and the associated piping to deal with. The custom tune for the ecu will be on the mild side to save you from engine problems.

 

Well you've got torque down there. Seems like a different animal.

Here's a Comptech S2000 dyno (stock powerband is closer to ours):



I like centrifugals on V-8's. They generally need the help up top, while being great (stock) down low. I'm not a big fan of them on less torquey engines, though.

 

A roots blower does make more power down low than a centrifugal supercharger. Early boost isn't a problem if you know how to control the throttle. If you spin your wheels, back off a little bit. Boost will go down on a roots if you do as it is dependent on the inlet flow which is now being blocked by a throttleplate. You'll have boost for half of the rpm range before the centrifugal even starts contributing. That's a lead. The centrifugal may have better top end power but it needs to in order to catch back up.

Your engine is obviously a large engine which a rotary is not. The narrower the powerband, the better suited the engine is for a centrifugal. The higher the redline the worse the engine is for one. The larger the engine, the better for a centrifugal. You don't need more low end power. The smaller the engine, the worse it is for a centrifugal. They may build boost linearly but that's not necessarily a good thing.

A small and high revving engine (2 strikes against it!) like a rotary is a bad candidate for a centrifugal supercharger. A roots or twin screw would help it where it is needed most and that is the low to midrange.

 

Some great pionts there RG .
Of the two SC's for an 8 now available I would still go CF over roots just for the outright acceleration at high rpm . Most of us have already got used to no low down torque.

 

I would beg to differ. I had a 99 Civic Si with a Jackson Racing SC, a roots blower. With front wheel drive with an open diff, it was the king of traction problems, but it was simple to control through throttle modulation, smooth and not peaky at all. The reason I chose that design (instead of Vortech which offered more HP for less money) was for the very fact that the true strength of the roots is to add torque across the powerband, somethng that car desperately needed.

 

Have you seen any claims for higher peak numbers with centrifugal than other types so far? I haven't seen any peak HP claims for centrifugal blowers on the renesis that couldn't be reached by a twin-screw.

And if a centrifugal charger and a twin-screw have the same peak HP, guess which one will be faster? The twin-screw. More area under the curve, more low-end, more mid-range, and the same top-end power.

I don't know about you, but I'd rather not give up half of the powerband.

 

just to be clear, this price is for used kits available on the forums and ebay

 

so far of those actually on the market (which is wghat we are talking about here)i've seen the Blitz offer about 240whp & a Rotormaster stage 2 CF offer 350 whp - sure the CF wont have it down low but which one do you think will be the quickest ?