Hunting Rx8 Differetnial Gears
11-05-2005 | 03:45 AM
#27
Kaiten Kenbu Rokuren
Joined: Jul 2004
Posts: 934
Likes: 2
From: Central Valley, NY
Yea, Fred I think we agree, the 6th gear is too short. I think you are right about the final drive not needing to be any more aggressive, I was doing some simple calculations(probably not the correct ones, but they gave me a general idea of the situation anyway) and saw that gas mileage would be awful with a higher gear ratio, well the rpm would be much higher anyway.
Shut up guitarjunkie! Come make my car faster, please?:p
Shut up guitarjunkie! Come make my car faster, please?:p
11-05-2005 | 11:31 AM
#28
Originally Posted by rotarygod
Unless you floor it everytime you drive it, why do you need more acceleration? You will absolutely get noticably worse gas mileage. It probably won't be much more acceleration anyways. At least not enough to make much of a noticable difference.
c'mon man, rowing the shifter more often = going faster
11-06-2005 | 04:54 AM
#29
port hacker
Joined: Nov 2004
Posts: 1,275
Likes: 0
From: socal
Originally Posted by Aoshi Shinomori
Yea, Fred I think we agree, the 6th gear is too short. I think you are right about the final drive not needing to be any more aggressive, I was doing some simple calculations(probably not the correct ones, but they gave me a general idea of the situation anyway) and saw that gas mileage would be awful with a higher gear ratio, well the rpm would be much higher anyway.
Shut up guitarjunkie! Come make my car faster, please?:p
Shut up guitarjunkie! Come make my car faster, please?:p
grab a wheelbarrel full of money and i'll put 400+ to the wheels.
11-07-2005 | 12:16 AM
#30
Originally Posted by rotarygod
Mazmart is planning to sell 4.10 rear ends for the RX-8. No word yet on availability or price. That would be the way to go in my opinion. The rear end is already too high numerically. You already shift through the gears too fast for normal street driving.
11-21-2005 | 08:22 PM
#31
Registered
Joined: Oct 2004
Posts: 332
Likes: 0
From: Philly
I've been hunting for a 4.778 and think I found a great solution for $295. First, check this S2000 video out. It shows what a ring and pinion swap from the stock S2000 4.10 gear to 4.57 gear can do.
Click HERE to see video of a stock S2k vs S2k w/4.57 gears
Apparently from the S2000 forum, the RX-8 stock 4.444 ring and pinion and the aftermarket Mazda 4.778 will fit in the S2000. http://www.s2ki.com/forums/index.php...ic=182172&st=0
For more proof, check out what our MX-5 brother have also concluded, Miata Drivetrain Interchange Guide
Also, it seems Mazda has been parting out its gears to Honda S2000s and Kia Sportages 4X4 1994-2002. The front axle of the Kia Sportage has the Mazda 4.778 ring and pinion. The S2000 guys are putting in the stock RX-8 4.444 and the Sportage 4.778. You can order it from www.kiaparts.com Part# MM057-27-110 for $295.62+s/h.
Even more interesting, it seems awfully coincidental that there is a Mazmart 4.10 Differential Swap (
S2000) , https://www.rx8club.com/showthread.php?t=76673&highlight=4.10
Last, if you want the 5.125 gearing, all you have to do is the 4.778 swap and step down to 225/40/18, and you'll be real close to that. This with the flywheel, CZ, High Flow Cat, and REVi will put us well into EVO, WRX STi and 350Z territory.
NOTE: You can use a Yellow Box $90+s/h to correct your speedo and odometer easily. Your city gas mileage will really improve with the swap, as will 0-60mph and 1/4mi. I estimate a 300-600rpm change at speed, if your worried about this just drive slower... 75 instead of 82mph.
Click HERE to see video of a stock S2k vs S2k w/4.57 gears
Apparently from the S2000 forum, the RX-8 stock 4.444 ring and pinion and the aftermarket Mazda 4.778 will fit in the S2000. http://www.s2ki.com/forums/index.php...ic=182172&st=0
For more proof, check out what our MX-5 brother have also concluded, Miata Drivetrain Interchange Guide
Also, it seems Mazda has been parting out its gears to Honda S2000s and Kia Sportages 4X4 1994-2002. The front axle of the Kia Sportage has the Mazda 4.778 ring and pinion. The S2000 guys are putting in the stock RX-8 4.444 and the Sportage 4.778. You can order it from www.kiaparts.com Part# MM057-27-110 for $295.62+s/h.
Even more interesting, it seems awfully coincidental that there is a Mazmart 4.10 Differential Swap (
S2000) , https://www.rx8club.com/showthread.php?t=76673&highlight=4.10 Last, if you want the 5.125 gearing, all you have to do is the 4.778 swap and step down to 225/40/18, and you'll be real close to that. This with the flywheel, CZ, High Flow Cat, and REVi will put us well into EVO, WRX STi and 350Z territory.
NOTE: You can use a Yellow Box $90+s/h to correct your speedo and odometer easily. Your city gas mileage will really improve with the swap, as will 0-60mph and 1/4mi. I estimate a 300-600rpm change at speed, if your worried about this just drive slower... 75 instead of 82mph.
Last edited by Slick8; 11-21-2005 at 08:37 PM.
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