Rx8 6-spd question
#3
I Post Mad Quick Yo!
Join Date: Dec 2001
Location: Markham, Ont. Can.
Posts: 1,248
Likes: 0
Received 0 Likes
on
0 Posts
The renisis is still a 13b!.. it even says it on the side of the engine. You should also know that the Rx-8 tranny isnt designed to hold as much power as the Fd's.. you may have problems in the future with reliablility.
#4
Rotorhead
Join Date: Feb 2001
Location: Charlottesville, Virginia, USA
Posts: 9,136
Likes: 0
Received 39 Likes
on
33 Posts
Originally posted by Mld>7
You should also know that the Rx-8 tranny isnt designed to hold as much power as the Fd's.. you may have problems in the future with reliablility.
You should also know that the Rx-8 tranny isnt designed to hold as much power as the Fd's.. you may have problems in the future with reliablility.
#6
Moderator
iTrader: (3)
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 31,125
Received 2,790 Likes
on
1,976 Posts
you guys are 6 speed happy, more is not always better
#7
Originally posted by j9fd3s
you guys are 6 speed happy, more is not always better
you guys are 6 speed happy, more is not always better
CJG
Trending Topics
#9
Rotorhead
Join Date: Feb 2001
Location: Charlottesville, Virginia, USA
Posts: 9,136
Likes: 0
Received 39 Likes
on
33 Posts
Originally posted by j9fd3s
you guys are 6 speed happy, more is not always better
you guys are 6 speed happy, more is not always better
1) 3.760
2) 2.269
3) 1.645
4) 1.187
5) 1.000
6) 0.843
Who would want this in their RX-7? I think those ratios are too tight for anything useful, although I am welcome to input from those who have better insight on this issue.
Now the 4.444 rear end gear may be another story. Does anybody know if the RX-8 uses the long pinion design?
#10
Is it true the Honda S2000, Mazda Miata and RX-8 6-speeds are all very similar units built by AISIN? I thought I read this in a magazine.
I don't believe the S2000 or Miata 6-speeds are known for their strength...
This sort of component sharing would not be that unusual for Japanese cars, BTW.
I don't believe the S2000 or Miata 6-speeds are known for their strength...
This sort of component sharing would not be that unusual for Japanese cars, BTW.
#11
Eye In The Sky
iTrader: (2)
Join Date: Feb 2001
Location: In A Disfunctional World
Posts: 7,909
Likes: 0
Received 123 Likes
on
72 Posts
You have to compare them with different differential gears to see the over all affect.
Gearing for the same ratio for top gear, you would have:
6 speed with a 3.5 diff-------5 speed with the 4.1 diff
(1) 13.13------------------------14.28
(2) 07.94------------------------08.26
(3) 05.76------------------------05.70
(4) 04.16------------------------04.10
(5) 03.50------------------------N/A
(6) 02.95--------------------(5) 02.95
The 6 speed with this setup would have a taller 1st and 2nd gears, with 3rd, and 4th almost equal. 5th being a new gear and 6th the same.
This could work as with about 350RWHP with stock 5 speed, 1st is almost useless for full acceleration, and 2nd gear still bearks loose a litte. The 6 speed would help here. Then you have the gear inbetween the old 4th and 5th.
I'd take it if you can get a 3.5 rear.
Gearing for the same ratio for top gear, you would have:
6 speed with a 3.5 diff-------5 speed with the 4.1 diff
(1) 13.13------------------------14.28
(2) 07.94------------------------08.26
(3) 05.76------------------------05.70
(4) 04.16------------------------04.10
(5) 03.50------------------------N/A
(6) 02.95--------------------(5) 02.95
The 6 speed with this setup would have a taller 1st and 2nd gears, with 3rd, and 4th almost equal. 5th being a new gear and 6th the same.
This could work as with about 350RWHP with stock 5 speed, 1st is almost useless for full acceleration, and 2nd gear still bearks loose a litte. The 6 speed would help here. Then you have the gear inbetween the old 4th and 5th.
I'd take it if you can get a 3.5 rear.
#12
SCCA Rookie
Join Date: May 2001
Location: Sterling Heights, MI
Posts: 1,936
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by j9fd3s
you guys are 6 speed happy, more is not always better
you guys are 6 speed happy, more is not always better
What about using the automatic differential with a 6-speed gearbox? Make use of those 3.91 gears in the automatic.
#13
Moderator
iTrader: (3)
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 31,125
Received 2,790 Likes
on
1,976 Posts
Originally posted by Barwick
NONSENSE!!!! You can always figure out how to use that new gear.
What about using the automatic differential with a 6-speed gearbox? Make use of those 3.91 gears in the automatic.
NONSENSE!!!! You can always figure out how to use that new gear.
What about using the automatic differential with a 6-speed gearbox? Make use of those 3.91 gears in the automatic.
i dunno call me lazy but i'll take the 5speed
mike
#15
Originally posted by Evil Aviator
This is the first car I have seen that needs to run the chassis dyno in 5th gear
This is the first car I have seen that needs to run the chassis dyno in 5th gear
Sometimes #'s on paper don't look all that good but in actuality they work out for the better.
#16
Rotors still spinning
iTrader: (1)
I drove the RX-8 a couple of times and the 'stump pulling' gear ratio doesn't seem that bad. The car will still do 80 mph in 2nd gear but that is at 10000 rpm vs 75 mph in my 2nd gen in 2nd gear at 8000 rpm. Remember that the total tire diameter is MUCH taller than the previous cars so some of that low gearing is made back up. Just so you all know, I can personally verify fuel cut at 10000 rpm in that car!
#17
Moderator
iTrader: (3)
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 31,125
Received 2,790 Likes
on
1,976 Posts
Originally posted by twokrx7
I'd settle for a 5-spd with decent synchros, tired of crunching 5th on the rebuilt trans ... was hoping the Rx-8 6-spd would have better designed synchros.
I'd settle for a 5-spd with decent synchros, tired of crunching 5th on the rebuilt trans ... was hoping the Rx-8 6-spd would have better designed synchros.
mike
#19
Moderator
iTrader: (3)
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 31,125
Received 2,790 Likes
on
1,976 Posts
#20
Rotor Head Extreme
iTrader: (8)
Here's some quick misc info of the Rx8 tranny.
The input shaft size is the same as the 2nd and 3rd gen Rx7's, meaning it will fit the turbo II and Fd clutch disc. The clutch design is the older push type. They shift like butter once fully broken in. Speedometer is electrical like the Fd's. Bellhousing will match any older rotary.
The input shaft size is the same as the 2nd and 3rd gen Rx7's, meaning it will fit the turbo II and Fd clutch disc. The clutch design is the older push type. They shift like butter once fully broken in. Speedometer is electrical like the Fd's. Bellhousing will match any older rotary.
#22
I've had my rx8 for 17k miles and am on my third tranny.
Essentially the syncros wore out really fast the first time. Then they rebuilt it and it blew up randomly. The rx8 has one of the worst trannies out there.. its kind of why I'm selling the rx8 actually.
Essentially the syncros wore out really fast the first time. Then they rebuilt it and it blew up randomly. The rx8 has one of the worst trannies out there.. its kind of why I'm selling the rx8 actually.
#23
Rotor Head Extreme
iTrader: (8)
Those are some very powerful words you got there. I'm sorry to tell you that your individual experience doesn't really speak negatively for the Rx8 tranny. The fact of the matter is that the mechanic that did your repair just did a poor job. Period! The tranny is very well engineered. I actually work for mazda and have never heard of any reoccurring problems with the tranny's however, any transmission is extremely difficult to work on when untrained. Background!
A couple months ago we had an 8 come into the shop that wouldn't engage 2nd gear. The child owner of the vehicle had been power shifting from 1st to 2nd which is abuse and voids warranty. He was fortunate as we convinced the warranty department to warranty the repair. Due to the situation, Mazda wasn't going to provide a reman but instead authorized internal repair. The very experienced mechanic had yet to work on an rx8 tranny. We ordered all the parts and began work. The tranny went back into the car and on the road for a test drive.
Everything seemed fine until he tried to engage 6th gear. No dice! Confused we drove back to the shop and he pulled and completely disassemble again. He found that he had inadvertently reversed the 2nd gear clutch hub sleeve by accident. With this problem rectified, we were back on the road for yet another test drive now to find that 2nd gear was now grinding into place. The mechanic was now getting frustrated.
Apart again it came. This time it was the syncro to the 2nd gear. He accidentally over pressed the gear into place crushing the new syncro. After receiving the new parts, we are now on another test drive. With gears 1-6 working great there was a sigh of relief. I told him to check reverse. Color metaphors began spewing out the mechanics mouth as reverse was now grinding. This time the reverse clutch hub sleeve was backwards.
I know this sounds redundant but the sleeves are really hard to tell the proper direction. Anyways, back on the road hoping that was the final straw. NOPE! Now 2nd gear was popping out and the shifter was tight. I suggested to him that maybe the shift linkage was bent from all the tear downs and reassembly. I personally felt this was why the 2nd kept popping out. I tested the linkage and sure enough, it was binding. With new parts on order, the mechanic decided to go to mazda training on the tranny. Buy this time he was and expert with the tranny and knew even more about it than the instructor. LOL!
When he got back from class he reassemble the tranny and now everything was perfect. The tranny now shifts even better than new. I told him that there was a bright side. He really got to learn something he was in fear of for many years. Now it's something he can easily do if he ever gets another one in the shop. I personally was fortunate and over came some fears at his expense and learned a ton.
The moral of this story is even trained professionals have limitations and fears. Transmissions repairs in general are extremely difficult to work on ( especially if you don't understand and can't visualize how they work mechanically ) and are better suited for specialized transmission shops because that's all they do. It's all about knowledge and repetition. Unfortunately, the Rx8 tranny is made so well that a huge percentage of Mazda mechanics have never and may never actually get the chance to internally worked on one in the real world. Training classes only educate you, but doesn't guarentee your going to retain all that knowledge in the future.
Xantium my advise to you is to find a mazda shop that is truely capable of fixing your problem.
Last edited by t-von; 05-22-07 at 12:24 AM.
#24
Moderator
iTrader: (3)
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 31,125
Received 2,790 Likes
on
1,976 Posts
Here's some quick misc info of the Rx8 tranny.
The input shaft size is the same as the 2nd and 3rd gen Rx7's, meaning it will fit the turbo II and Fd clutch disc. The clutch design is the older push type. They shift like butter once fully broken in. Speedometer is electrical like the Fd's. Bellhousing will match any older rotary.
The input shaft size is the same as the 2nd and 3rd gen Rx7's, meaning it will fit the turbo II and Fd clutch disc. The clutch design is the older push type. They shift like butter once fully broken in. Speedometer is electrical like the Fd's. Bellhousing will match any older rotary.
#25
Moderator
iTrader: (3)
Join Date: Mar 2001
Location: https://www2.mazda.com/en/100th/
Posts: 31,125
Received 2,790 Likes
on
1,976 Posts
Those are some very powerful words you got there. I'm sorry to tell you that your individual experience doesn't really speak negatively for the Rx8 tranny. The fact of the matter is that the mechanic that did your repair just did a poor job. Period! The tranny is very well engineered. I actually work for mazda and have never heard of any reoccurring problems with the tranny's however, any transmission is extremely difficult to work on when untrained. Background!
A couple months ago we had an 8 come into the shop that wouldn't engage 2nd gear. The child owner of the vehicle had been power shifting from 1st to 2nd which is abuse and voids warranty. He was fortunate as we convinced the warranty department to warranty the repair. Due to the situation, Mazda wasn't going to provide a reman but instead authorized internal repair. The very experienced mechanic had yet to work on an rx8 tranny. We ordered all the parts and began work. The tranny went back into the car and on the road for a test drive.
Everything seemed fine until he tried to engage 6th gear. No dice! Confused we drove back to the shop and he pulled and completely disassemble again. He found that he had inadvertently reversed the 2nd gear clutch hub sleeve by accident. With this problem rectified, we were back on the road for yet another test drive now to find that 2nd gear was now grinding into place. The mechanic was now getting frustrated.
Apart again it came. This time it was the syncro to the 2nd gear. He accidentally over pressed the gear into place crushing the new syncro. After receiving the new parts, we are now on another test drive. With gears 1-6 working great there was a sigh of relief. I told him to check reverse. Color metaphors began spewing out the mechanics mouth as reverse was now grinding. This time the reverse clutch hub sleeve was backwards.
I know this sounds redundant but the sleeves are really hard to tell the proper direction. Anyways, back on the road hoping that was the final straw. NOPE! Now 2nd gear was popping out and the shifter was tight. I suggested to him that maybe the shift linkage was bent from all the tear downs and reassembly. I personally felt this was why the 2nd kept popping out. I tested the linkage and sure enough, it was binding. With new parts on order, the mechanic decided to go to mazda training on the tranny. Buy this time he was and expert with the tranny and knew even more about it than the instructor. LOL!
When he got back from class he reassemble the tranny and now everything was perfect. The tranny now shifts even better than new. I told him that there was a bright side. He really got to learn something he was in fear of for many years. Now it's something he can easily do if he ever gets another one in the shop. I personally was fortunate and over came some fears at his expense and learned a ton.
The moral of this story is even trained professionals have limitations and fears. Transmissions repairs in general are extremely difficult to work on ( especially if you don't understand and can't visualize how they work mechanically ) and are better suited for specialized transmission shops because that's all they do. It's all about knowledge and repetition. Unfortunately, the Rx8 tranny is made so well that a huge percentage of Mazda mechanics have never and may never actually get the chance to internally worked on one in the real world. Training classes only educate you, but doesn't guarentee your going to retain all that knowledge in the future.
Xantium my advise to you is to find a mazda shop that is truely capable of fixing your problem.
A couple months ago we had an 8 come into the shop that wouldn't engage 2nd gear. The child owner of the vehicle had been power shifting from 1st to 2nd which is abuse and voids warranty. He was fortunate as we convinced the warranty department to warranty the repair. Due to the situation, Mazda wasn't going to provide a reman but instead authorized internal repair. The very experienced mechanic had yet to work on an rx8 tranny. We ordered all the parts and began work. The tranny went back into the car and on the road for a test drive.
Everything seemed fine until he tried to engage 6th gear. No dice! Confused we drove back to the shop and he pulled and completely disassemble again. He found that he had inadvertently reversed the 2nd gear clutch hub sleeve by accident. With this problem rectified, we were back on the road for yet another test drive now to find that 2nd gear was now grinding into place. The mechanic was now getting frustrated.
Apart again it came. This time it was the syncro to the 2nd gear. He accidentally over pressed the gear into place crushing the new syncro. After receiving the new parts, we are now on another test drive. With gears 1-6 working great there was a sigh of relief. I told him to check reverse. Color metaphors began spewing out the mechanics mouth as reverse was now grinding. This time the reverse clutch hub sleeve was backwards.
I know this sounds redundant but the sleeves are really hard to tell the proper direction. Anyways, back on the road hoping that was the final straw. NOPE! Now 2nd gear was popping out and the shifter was tight. I suggested to him that maybe the shift linkage was bent from all the tear downs and reassembly. I personally felt this was why the 2nd kept popping out. I tested the linkage and sure enough, it was binding. With new parts on order, the mechanic decided to go to mazda training on the tranny. Buy this time he was and expert with the tranny and knew even more about it than the instructor. LOL!
When he got back from class he reassemble the tranny and now everything was perfect. The tranny now shifts even better than new. I told him that there was a bright side. He really got to learn something he was in fear of for many years. Now it's something he can easily do if he ever gets another one in the shop. I personally was fortunate and over came some fears at his expense and learned a ton.
The moral of this story is even trained professionals have limitations and fears. Transmissions repairs in general are extremely difficult to work on ( especially if you don't understand and can't visualize how they work mechanically ) and are better suited for specialized transmission shops because that's all they do. It's all about knowledge and repetition. Unfortunately, the Rx8 tranny is made so well that a huge percentage of Mazda mechanics have never and may never actually get the chance to internally worked on one in the real world. Training classes only educate you, but doesn't guarentee your going to retain all that knowledge in the future.
Xantium my advise to you is to find a mazda shop that is truely capable of fixing your problem.
next time it would be easier with a jig, holding 60lbs of shafts/gears isnt any fun, and it cant be how they do it at the factory....
also we've just been replacing the whole assembly, by the time you add up the internal parts ($$$ and they dont have em!) and the labor, its cheaper and quicker to to the whole thing. i know thats not what tech line says, but they are incorrect on this one.