who makes the best S/C for rx8
12-19-2006, 06:03 PM
#1
wankel rules!
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who makes the best S/C for rx8
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
Excuse my grammer
12-19-2006, 06:16 PM
#4
Power!!
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...
12-20-2006, 12:11 AM
#10
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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.
*sorry...but it's "grammar" not "er."
2 cents.
12-20-2006, 12:25 AM
#11
Originally Posted by Phantom Menace
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.
*sorry...but it's "grammar" not "er."
2 cents.
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
12-20-2006, 12:25 AM
#12
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Originally Posted by Brettus
The answer is : Rotormaster . Because its better than Blitz & is the only other one that is actually on the market.
12-20-2006, 12:34 AM
#13
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Originally Posted by rotarygod
A Greddy turbo kit can be had for as little as $1750 now ...
12-20-2006, 09:16 AM
#16
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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.
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.
Last edited by strokercharged95gt; 12-20-2006 at 09:23 AM.
12-20-2006, 09:21 AM
#17
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Originally Posted by rotarygod
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.
12-20-2006, 09:33 AM
#18
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.
12-20-2006, 03:03 PM
#19
Bummed, but bring on OU!
Originally Posted by strokercharged95gt
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.
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.
12-20-2006, 05:23 PM
#20
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Originally Posted by strokercharged95gt
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.
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.
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.
12-20-2006, 05:58 PM
#21
Originally Posted by rotarygod
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.
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.
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.
12-20-2006, 07:53 PM
#22
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Originally Posted by strokercharged95gt
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.
12-20-2006, 09:29 PM
#23
'03 Dodge Viper
Originally Posted by Brettus
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.
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.
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.
12-20-2006, 10:51 PM
#24
Go Texas Longhorns!
Originally Posted by rotarygod
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.
12-20-2006, 10:53 PM
#25
Originally Posted by SlayerRX8
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.
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.
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 ?