4.778 Final Drive For $296
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4.778 Final Drive For $296
MOD EDIT: Lots of info in this thread.....but the KIA R and P doesnt work in the RX8.
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 has 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.
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 has 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 rotarygod; 11-23-2005 at 01:45 AM.
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Damn that is pretty affordable, and would probably kick *** on the track.
Just read through some more of the s2k thread and it looks like the Kia 4.77 gear might be a bit weak, and some people are Cryo treating them to help out. These are the same people that do Frozen Rotors: http://www.diversifiedcryogenics.com...rtspricing.htm
Just read through some more of the s2k thread and it looks like the Kia 4.77 gear might be a bit weak, and some people are Cryo treating them to help out. These are the same people that do Frozen Rotors: http://www.diversifiedcryogenics.com...rtspricing.htm
Last edited by QBallz; 11-21-2005 at 08:20 PM.
#3
Bummed, but bring on OU!
It always seemed a little suspicious to me, with the similar final drive ratios between makes out of Asia. That 4.10 swap immediately made me think of the S2000 as well. Will that Yellow Box work on the 8? Where does it hook up?
4.78 sounds good to me. I need to slow down on the highway anyway . I'm gonna get burned by the coppers sooner or later. Given the 4spd's crappy gear ratios, this might be nice.
4.78 sounds good to me. I need to slow down on the highway anyway . I'm gonna get burned by the coppers sooner or later. Given the 4spd's crappy gear ratios, this might be nice.
#4
Originally Posted by Slick8
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 has 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 has 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.
Yes, this is all true!, I did not know that we can use the same gears though from the s2k, hmm! thats great that it's such a affordable price to!
My cousin has an S2000 and he will be getting his 4.57 Gears very soon, If you watch the video you can really tell differnce. well all i can say is For that price? PUT ME ON THE LIST ASAP
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You might even be able to sell your stock RX-8 4.444 to an S2000 owner!
The S2000 choice alternative is the 4.57 aftermarket gear which is very very noisy, however strong but not a precision high quality unit like Mazda's 4.444. Not a noticeable difference between the two in performance. I suspect the 4.444 were scarce since the RX-8 was into later production hence the 4.57 alternative.
The 4.778 option on the S2000 is a bit too much on the highway for most drivers, 5200rpm+ at 75-80mph.
The S2000 choice alternative is the 4.57 aftermarket gear which is very very noisy, however strong but not a precision high quality unit like Mazda's 4.444. Not a noticeable difference between the two in performance. I suspect the 4.444 were scarce since the RX-8 was into later production hence the 4.57 alternative.
The 4.778 option on the S2000 is a bit too much on the highway for most drivers, 5200rpm+ at 75-80mph.
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Only real question is how much to install. I'm an avid do it yourselfer but I just looked at the shop manual for the Diff and there are a crapload of parts, and they look like they all have to fit perfectly or your screwed.
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Yellow Box installs like this:
Rick has them for $90+s/h, http://www.ricks2k.com/products/yellowbox.php
Rick has them for $90+s/h, http://www.ricks2k.com/products/yellowbox.php
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indeed good find......but that would be one loud ride on teh highway to see my gf at 5200 rpm .....awe well guess it's a give and take kinda thing
edit: just noiced that was for the s2000 drivers on the highway..i wonder what our rpm's would be at at 75 in 6th with the new gearing....hmm time to do some research i guess.
edit: just noiced that was for the s2000 drivers on the highway..i wonder what our rpm's would be at at 75 in 6th with the new gearing....hmm time to do some research i guess.
Last edited by army_rx8; 11-21-2005 at 09:45 PM.
#12
Bummed, but bring on OU!
Originally Posted by army_rx8
indeed good find......but that would be one loud ride on teh highway to see my gf at 5200 rpm .....awe well guess it's a give and take kinda thing
edit: just noiced that was for the s2000 drivers on the highway..i wonder what our rpm's would be at at 75 in 6th with the new gearing....hmm time to do some research i guess.
edit: just noiced that was for the s2000 drivers on the highway..i wonder what our rpm's would be at at 75 in 6th with the new gearing....hmm time to do some research i guess.
Last edited by therm8; 11-21-2005 at 10:10 PM.
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Speed vs RPM in 1st, 2nd, ..., 6th gear
Speed vs RPM for the 4.444 gear
Speed vs RPM for the 4.778 gear
Speed vs RPM for the 4.778 gear and 225/40/18 (5.125 equivalent gear)
Speed vs RPM for the 4.778 gear
Speed vs RPM for the 4.778 gear and 225/40/18 (5.125 equivalent gear)
Last edited by Slick8; 11-21-2005 at 10:53 PM.
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Last edited by Renesis_8; 09-11-2011 at 07:50 AM.
#15
RX8 and a Truk....
Originally Posted by Slick8
Speed vs RPM for the 4.444 gear
Speed vs RPM for the 4.778 gear
Speed vs RPM for the 4.778 gear and 225/40/18 (5.125 equivalent gear)
Speed vs RPM for the 4.778 gear
Speed vs RPM for the 4.778 gear and 225/40/18 (5.125 equivalent gear)
you might have your labels for those charts reversed
:D
#17
Gotta hoist the flag to the top of the mast on the "you'll get better gas mileage with a numerically higher rear axle ratio" bit.
I can't say a priori that a silly high gear won't put an 8 into the same league as an STi or Evo. Common sense says, from 0-60, maybe, 1/4 mile, I frickin' doubt it.
Also, 1st gear will become pretty much useless with a 5.x gear, don't you think?
It will be cool to see how this stuff works out when people try it.
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Makes perfect common sense if you had some .
The shorter final gear will make the greatest impact on 1st gear, then 2nd less so, 3rd even less so, and so on... The reverse happens in the upper gears where this mechanical advantage is lost to higher RPMs in 4th, more in 5th and even more in 6th. That's why city driving will benefit from the lower gears. It's really pretty simple,
Shorter gearing = a mechanical advantage = less work = better mpg
Analogy: Try riding around in a 10 speed bicycle in the lowest gear at a slow speed. This may be difficult since you would have to put in more work. Now do the same in a highest gear yet still riding at a slow speed, less work right. That's why city driving will benefit from the lower gears.
Now do the opposite. Try riding around in the lowest gear at a very high speed, a lot less work than riding around in the highest gear at a high speed. You will gain mpg in city driving, but will lose mpg on the highway. However, you can compensate for the loss of mpg at highspeed by driving a little slower on the highway. The spread between the 4.444 and 4.778 gear is about 7mph (300-600rpm) at around 70-80mph.
Last, an even simpler concept, a quicker 0-60mph = a quicker 1/4mi .
However your version of "common sense" says a quicker 0-60mph = the same 1/4mi time
The shorter final gear will make the greatest impact on 1st gear, then 2nd less so, 3rd even less so, and so on... The reverse happens in the upper gears where this mechanical advantage is lost to higher RPMs in 4th, more in 5th and even more in 6th. That's why city driving will benefit from the lower gears. It's really pretty simple,
Shorter gearing = a mechanical advantage = less work = better mpg
Analogy: Try riding around in a 10 speed bicycle in the lowest gear at a slow speed. This may be difficult since you would have to put in more work. Now do the same in a highest gear yet still riding at a slow speed, less work right. That's why city driving will benefit from the lower gears.
Now do the opposite. Try riding around in the lowest gear at a very high speed, a lot less work than riding around in the highest gear at a high speed. You will gain mpg in city driving, but will lose mpg on the highway. However, you can compensate for the loss of mpg at highspeed by driving a little slower on the highway. The spread between the 4.444 and 4.778 gear is about 7mph (300-600rpm) at around 70-80mph.
Last, an even simpler concept, a quicker 0-60mph = a quicker 1/4mi .
However your version of "common sense" says a quicker 0-60mph = the same 1/4mi time
Last edited by Slick8; 11-22-2005 at 01:37 AM.
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I dont understand those figures for the current ratio. 132 in 4th gear is unattainable for our current setup. From my experience.. 4th at 9000 rpm is 120. 132 isnt correct.
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those r simply theoretical rpm vs mph, theres drivetrain loss and air resistance involved in reality, but its a good comparsion of how ur rpm would change when u change out the final drive
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Last edited by Renesis_8; 09-11-2011 at 07:51 AM.
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^The only way those numbers are wrong is if the Formula's are wrong. There should be no drivetrain/air resistance factored into that unless you clutch is slipping.
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Canzoomer did this with 215/35/17 Nokian WR tires that have a 5% shorter drive ratio with no clutch drop... "Slipped clutch slightly, at launch, and at 1st/2nd shift up to 4500rpm" The 35s are equivalent to a 4.778 gear.
With the the 4.778 gear and 225/40/18, you should improve the 1/4mi since this combo makes a 5.125 gear equivalent.
With the the 4.778 gear and 225/40/18, you should improve the 1/4mi since this combo makes a 5.125 gear equivalent.
Last edited by Slick8; 11-22-2005 at 09:29 AM.
#24
Hmm okay, so now we've found other cars that share the same rear gear as our car. Now let's find another car that shares our Aisin transmission, but with taller 5th and 6th gears. The 4th to 5th and 5th to 6th shifts give a meager 500 RPM drop each. What's the point of a 6-speed if three of your ratios are crammed so close together?
#25
Originally Posted by BaronVonBigmeat
Hmm okay, so now we've found other cars that share the same rear gear as our car. Now let's find another car that shares our Aisin transmission, but with taller 5th and 6th gears. The 4th to 5th and 5th to 6th shifts give a meager 500 RPM drop each. What's the point of a 6-speed if three of your ratios are crammed so close together?