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ROLEX cup rx8 info

Old 04-28-07, 08:11 PM
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ROLEX cup rx8 info

I was going to go on rx8 forum, but Im too lazy to create an account for one question.

I was wondering the specs on the rolex cup rx8's? Weight power mods suspension, brakes?

Im watching it right now on speedvision, and its doing very well.
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Old 04-28-07, 08:30 PM
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Why not just hit up speedsource's wedsite? they would have the specs on the RX8 there
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Old 04-28-07, 08:31 PM
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got it. thanks
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Old 04-28-07, 08:44 PM
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Im wondering the specs for this rolex race. The rx8 is racing porsche gt3's. There is a huge hp difference, but the rx8 is doing really well. Im doubting if it really jsut has 238hp
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Old 04-28-07, 09:07 PM
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it's a 3 rotor
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Old 04-28-07, 09:08 PM
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MAZDASPEED announced the continuation of its partnership with Florida-based SpeedSource, Inc. in the Grand American Road Racing Association Rolex Series GT-class. The SpeedSource Grand Am GT Mazda RX-8 is based on a tube-frame chassis jointly developed by SpeedSource and Riley Technologies, and powered by Mazda's three-rotor 20B Renesis rotary engine
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Old 04-28-07, 10:03 PM
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Originally Posted by initial D is REAL!
Im wondering the specs for this rolex race. The rx8 is racing porsche gt3's. There is a huge hp difference, but the rx8 is doing really well. Im doubting if it really jsut has 238hp
PP 20B sounds great.

http://s156.photobucket.com/albums/t...t=MVI_1601.flv

Not my stuff, I believe trackaddict from rx8club is the man for all those shots/video.
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Old 04-30-07, 07:22 AM
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Is the Rolex engine a PP engine or a 20B Renesis (side port)?

-bill "too lazy to surf for it" rankin
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Old 04-30-07, 08:46 AM
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Originally Posted by wrankin
Is the Rolex engine a PP engine or a 20B Renesis (side port)?

-bill "too lazy to surf for it" rankin
Everything I've read says it's a 20B based on the Renesis. It's also a tube-frame chassis which it why its so damn light (which helps its competitiveness with the Porsches).
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Old 04-30-07, 12:06 PM
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450 advertised horsepower
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Old 04-30-07, 12:34 PM
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And it sounds great in person! VIR Rolex was this weekend.
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Old 04-30-07, 01:30 PM
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Originally Posted by Turbo II
And it sounds great in person! VIR Rolex was this weekend.
Don't rub it in. I live 45 minutes from the track but had to go out of town. I volunteered as a corner worker for a couple years.

-bill
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Old 04-30-07, 06:30 PM
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Originally Posted by wrankin
Is the Rolex engine a PP engine or a 20B Renesis (side port)?

-bill "too lazy to surf for it" rankin

It is a PPort motor.
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Old 04-30-07, 08:03 PM
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Originally Posted by sccagt3
It is a PPort motor.

+1

Nothing Renesis about it. The rotary they were running in the ALMS LMP2 car was a side port Renesis. The GA GT cars use a p-port.
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Old 04-30-07, 10:35 PM
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Originally Posted by C. Ludwig
The rotary they were running in the ALMS LMP2 car was a side port Renesis.
No it wasn't. It was a 13G peripheral port 3 rotor that had rotors in it that supposedly shared "Renesis technology" or whatever the hell that means. It put out right at 450 hp and the Speedsource 3 rotor P-port puts out right at 420 hp. Keep in mind this info came from David Haskell at Sevenstock who is a driver of that car.

He told us exactly what the Speedsource engine is built from. No secrets. Awesome. Too bad there are people out there that are too chicken to show off their work. The Speedsource 3 rotor uses Racing Beat peripheral port housings. The first engine used Mazda factory Peripheral port housings. They actually found that although the Mazda housings made slightly more ultimate top end horsepower, it was down on power to the RB housings almost everywhere else. They understand that it's the average power through the powerband that matters and not the ultimate peak. As a result of their testing they decided to settle on the RB housings. It has S5 n/a 9.7:1 compression rotors. 13G peripheral port end and intermediate housings. The rest is pretty standard. Their engine makes less peak horsepower than the Courage did because of the longer intake runners. It wasn't intended to be revved as high. As a result it does have more average torque than the Courage did. Motec controls it all. The air filter is on top of the engine. The airbox is shielded with insulating materials. It looks like the Lunar Lander. It draws in air from the high pressure zone at the base of the windshield using the cowl induction design.

The car itself is a complete tube frame purpose built race car. The strange part is the engine and transmission. The engine as we all know is a 3 rotor. It is mounted so far back that it is nearly next to the driver. Much farther back than the engine mounts in a street car and this one has 3 rotors. The transmission is in the rear of the car. It is a modified Porsche transaxle. The clutch is still attached to the engine but it ties in to a driveshaft much like the Corvettes do which then enters into the transmission at the rear. This setup keeps perfect weight distribution through the car. There was a big long slideshow about the design of the car and how it was built back at Sevenstock. You'd really be impressed if you saw the lengths they went through to build it. Wonderful piece of work and definitely a car and team to respect.

Here's the BK engine from last year. I've got pictures of the Speedsource engine bay somewhere. I'll try to find them.
Attached Thumbnails ROLEX cup rx8 info-bk-motorsportr20b_web.jpg   ROLEX cup rx8 info-bk-motorsportr20b_web_a.jpg  
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Old 04-30-07, 11:02 PM
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wow, great info. Thanks.
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Old 05-01-07, 06:43 AM
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Well I stand corrected on the LMP car. I do distinctly remember seeing photos of that car with a side exhaust engine in it. Was the p-port engine something that came along during the development after beginning the first year with a side port engine?

As always, great info at Mulsanne's Corner.

http://www.mulsannescorner.com/couragec65-9.html


Pics of the Team Spencer GA GT RX-8. Virtual twin of the Speedsource cars.

http://www.kyrotary.com/images/themi.../IMG_1728.html

http://www.kyrotary.com/images/themi.../IMG_1729.html
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Old 05-01-07, 06:43 PM
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The Courage engine was always a peripheral port. Many were confused because it was called a Renesis and then on top of that a CAD drawn 3 rotor side port engine was circulated around that was assumed was the new engine when the whole time it was a 13G. Here's that picture.
Attached Thumbnails ROLEX cup rx8 info-renesis3rotorcad.jpg  
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Old 05-01-07, 07:22 PM
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Originally Posted by rotarygod
The Courage engine was always a peripheral port. Many were confused because it was called a Renesis and then on top of that a CAD drawn 3 rotor side port engine was circulated around that was assumed was the new engine when the whole time it was a 13G. Here's that picture.

Yeah. I swear I saw a real pic of that engine in the car. I distinctly remember the header. Easily distinguished between the p-port and side port exhaust header. Oh well. I remember a lot of stuff everyone else said never happened. Part of getting old I guess.
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Old 05-03-07, 08:40 AM
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The orange #63 3 rotor peripheral (not Renesis) port RX-8 was at the Mitty race at Road Atlanta last weekend, in my IMSA car run group (but thankfully not in my 2 rotor GTU class.) He blew by my 2 rotor PP really fast; 50% more rotors = 50% more horsepower.
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Old 05-03-07, 10:58 PM
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Originally Posted by speedturn
50% more rotors = 50% more horsepower.
Not neccessary. Depends on the rest of the combination and intent of use.
If that were the case then I could build a 600hp 3-rotor based on what I've done with a 2-rotor PP.
But then again a friend of mines is making over 550rwhp with his 3-rotor. I guess that qualifies him over 600hp at the flywheel.
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Old 05-21-07, 01:43 PM
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I went out to Laguna on saturday. The Speed Source cars are awesome. They sound incredible. I'll try to post some pics tonight
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