Pettit Super Charger Owners - Page 439 - RX8Club.com



Series I Major Horsepower Upgrades This is the place to discuss Super Chargers and Turbos, Nitrous, Porting, etc
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Old 04-13-2018, 02:35 PM   #10951  
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I'm continuing to make progress (slowly). I got the transmission out after some swearing. I'll be getting some components out of it to send for upgrading so that I can safely hit 10k RPM in my 6 speed AT. I should also get better shifting performance that's not so sluggish.
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Old 04-14-2018, 11:20 AM   #10952  
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so that I can safely hit 10k RPM in my 6 speed AT.
Why tho? What is the reasoning for this?
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Old 04-14-2018, 11:48 AM   #10953  
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Why tho? What is the reasoning for this?
More power, more noise, more fun?

Is this a bad idea? If so, why?
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Old 04-14-2018, 01:05 PM   #10954  
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I don't think there's any more power to be had above 9k. Maybe I'm wrong but I believe power starts dropping off at those high RPMS.
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Old 04-14-2018, 01:09 PM   #10955  
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Yeah I think you're right, but I'm limited to 7.5k now. 10k is just a safety factor. I just want it to be tuned as you could the manuals.
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Old 04-15-2018, 05:23 PM   #10956  
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Quick update:

My care package from Ryan Rotary is ready and was sent out to me today. Looking forward to getting all this installed!

I went with the full pulley set (can run more boost later if I feel the need), the oil filler upgrade, and even got some injectors at a good price.
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Old 04-16-2018, 09:21 AM   #10957  
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I don't think there's any more power to be had above 9k. Maybe I'm wrong but I believe power starts dropping off at those high RPMS.
Most of the dynos I saw with the SC would peak around 8200-8500.
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Old 04-16-2018, 09:23 AM   #10958  
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Quick update:

My care package from Ryan Rotary is ready and was sent out to me today. Looking forward to getting all this installed!

I went with the full pulley set (can run more boost later if I feel the need), the oil filler upgrade, and even got some injectors at a good price.
Nice! I prob have 2k-3k on those pulleys without slippage so far. Really have worked out great for me so far.
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Old 04-16-2018, 06:51 PM   #10959  
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Most of the dynos I saw with the SC would peak around 8200-8500.
Agreed, though running a bit over peak HP can still help to shift into a better spot in the power band for the next gear. Not that I'm going to be racing where every .01 sec matters.
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Old 04-16-2018, 06:53 PM   #10960  
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Nice! I prob have 2k-3k on those pulleys without slippage so far. Really have worked out great for me so far.
Great to hear! I'm really trying to get every aspect of this kit built right the first time - I HATE to redo things.

Any idea what size belt(s) I'll need? Did you do the Gatorback belts like our forefathers?
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Old 04-17-2018, 11:44 AM   #10961  
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I first used just regular belts and then switched to Gatorback when I first had slippage and stuck with them. I should be able to get the part number off of the one on it. What boost pulley are you running?
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Old 04-17-2018, 11:52 AM   #10962  
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I'm starting with the low boost pulley... 90mm? I'm assuming the smaller the pulley the higher the boost, but don't have the system together to analyze it. I don't really know where each pulley goes yet.
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Old 04-18-2018, 06:37 AM   #10963  
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Great to hear! I'm really trying to get every aspect of this kit built right the first time - I HATE to redo things.

Any idea what size belt(s) I'll need? Did you do the Gatorback belts like our forefathers?


Gatorbacks are now Continental Elite Poly-V Belt. I don't recall offhand the belt currently in my -8, but you can get a close guess at the size needed by running a flat electrical cord around the pulleys as installed, with the tensioner about 1/3rd extended. The Continental part # 4050330 is a Poly-V, 5-rib, 33". I *think* mine turned out to be a 33.5", so that would have been a 4050335.

You will need a 40603XX (Poly-V, 6-rib, 30-something inches).

Have fun!
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