(DRIVETRAIN) Transmission gear ratios?
05-29-06, 05:02 PM
#1
Call me "Snake"
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(DRIVETRAIN) Transmission gear ratios?
I've spotted some threads about 2nd gen transmissions swaps into FBs. What's the advantage? Are the ratios different?
I would like a gearbox with a shorter 1st and 2nd gear, or closer ratios. I'm willing to modify. What are my options?
I would like a gearbox with a shorter 1st and 2nd gear, or closer ratios. I'm willing to modify. What are my options?
05-29-06, 05:09 PM
#2
voo doo witchdoctor
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i think that the main reason for swapping them is some of them are stronger than frist gen trannies
as far as ratios go im not sure. the gsl-se transmission has a taller 5th gear than the others do but im not sure of the 2nd gen trannies
as far as ratios go im not sure. the gsl-se transmission has a taller 5th gear than the others do but im not sure of the 2nd gen trannies
05-29-06, 05:48 PM
#3
Hmm if you're looking for a shorter 1st and 2nd, and I'd assume 3rd since it's forkin' steep, it would probably be easier to change your diff gear. If you don't mind the loss of some top-end, changing the diff gear can help a lot with short distance sprints, which is what most people want to shorten the lower gears for.
For an added bonus, if you have a GS like me, you can use it as an excuse to get a limited slip differential in there, instead of the open one. Or if you want to go all-out, get a miata torsen rear diff, and put it inside your diff's housing. You'll get your taller rear gear *and* better hookups on take off.
Jon
For an added bonus, if you have a GS like me, you can use it as an excuse to get a limited slip differential in there, instead of the open one. Or if you want to go all-out, get a miata torsen rear diff, and put it inside your diff's housing. You'll get your taller rear gear *and* better hookups on take off.
Jon
05-29-06, 08:25 PM
#5
google is ur friend. u'll be surprised what u'll find if u search it. here's what i found:
http://members.aol.com/solomiata/Drivetrain.html
actually was trying to find another site that i can't remember the name of. it has "toolbox" in the url. someone here might know the site i'm talking about. it has tons of info on the different tranny ratios, interchangeability and the like.
http://members.aol.com/solomiata/Drivetrain.html
actually was trying to find another site that i can't remember the name of. it has "toolbox" in the url. someone here might know the site i'm talking about. it has tons of info on the different tranny ratios, interchangeability and the like.
05-29-06, 09:49 PM
#6
Not trying to be an *** here, you're new, so a little heads up.
The 1st section has 1007 pages of threads, the archives have 4 pages and growing, thanks to Jon, and there are 4 stickey threads at the top of the forum. You joined 3 days ago and started 4 threads today asking questions that are frequently asked and can be found in a search. Funny thing about doing a search, I, myself personally, always learn more than I was looking for by doing a search.
That is why you received the comment from me about the 289 vs 327, you need to spend more time doing your homework.
We are all here to help, but much of the learning is the personal resposibility of the members. So far you have been fortunate and not gotten flamed and been told, bluntly, to use the search button. I will politely encourage you to do so, as I am not a hand hold holder here to lead newbs down the rotary path. I generally point them in the right direction.
If you choose to flame me for the heads up, I won't be pointing with the index finger.
Welcome to the forum and enjoy your search efforts.
The 1st section has 1007 pages of threads, the archives have 4 pages and growing, thanks to Jon, and there are 4 stickey threads at the top of the forum. You joined 3 days ago and started 4 threads today asking questions that are frequently asked and can be found in a search. Funny thing about doing a search, I, myself personally, always learn more than I was looking for by doing a search.
That is why you received the comment from me about the 289 vs 327, you need to spend more time doing your homework.
We are all here to help, but much of the learning is the personal resposibility of the members. So far you have been fortunate and not gotten flamed and been told, bluntly, to use the search button. I will politely encourage you to do so, as I am not a hand hold holder here to lead newbs down the rotary path. I generally point them in the right direction.
If you choose to flame me for the heads up, I won't be pointing with the index finger.
Welcome to the forum and enjoy your search efforts.
05-29-06, 10:48 PM
#7
Call me "Snake"
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Originally Posted by trochoid
That is why you received the comment from me about the 289 vs 327, you need to spend more time doing your homework.
If you choose to flame me for the heads up, I won't be pointing with the index finger.
If you choose to flame me for the heads up, I won't be pointing with the index finger.
As for searching the archive, it occured to me that a lot of that stuff was years old. So, I thought I would freshen the info pool & clean out the fridge. Some people refer to it as 'bench racing'. Let's smoke the peace pipe, dude.
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05-30-06, 01:14 AM
#8
This is from Felix Miata's site (currently offline)
Code:
US Spec Mazda Driveline Ratios 20:55 Rear Net Tire RPM @ -Countershaft & Mainshaft Gear Teeth-- Vehicle Year 1st 2nd 3rd 4th 5th Axle Final Tire Size RPM 60 MPH C1 C2 C3 C4 C5 M1 M2 M3 M4 M5 Tooth Count Certainty or Notes 626 79-82 3.214 1.818 1.296 1.000 0.860 3.636 3.128 185/70-13 894 2796 14 22 27 30 31 27 24 21 18 16 B2000 82-84 4.359 2.519 1.507 1.000 0.875 3.308 2.894 B2000 Auto 82-84 4.359 2.519 1.507 1.000 0.875 3.900 3.413 B2200 82-84 4.359 2.519 1.507 1.000 0.875 3.900 3.413 B2x00 85-up 3.622 2.186 1.419 1.000 0.859 13 20 32 37 47 28 26 27 22 24 B2x00 Man4WD 87-88 Part # M054-27-110A ----> 4.444 fits RX-2, RX-3*, RX-7, RWD 626 thru 1985; Miata '94-up Cosmo 76 3.683 2.263 1.397 1.000 0.862 3.636 3.134 185/70-14 855 2680 14 22 28 32 33 29 28 22 18 16 100% Cosmo 77-78 3.380 2.002 1.390 1.000 0.791 3.636 2.877 185/70-14 855 2460 14 22 27 31 33 29 27 23 19 16 100% Cosmo 78.5 3.380 2.077 1.390 1.000 0.791 3.636 2.877 185/70-14 855 2460 14 22 27 31 33 29 28 23 19 16 100% R-100 70-72 REPU 74 3.683 2.263 1.397 1.000 4.625 4.625 7.35-14 792 3663 14 22 28 32 33 29 28 22 18 16 TRPM Estimated REPU Auto 74 3.683 2.263 1.397 1.000 4.375 4.375 7.35-14 792 3465 14 22 28 32 33 29 28 22 18 16 TRPM Estimated REPU 75 3.683 2.263 1.397 1.000 4.375 4.375 7.35-14 792 3465 14 22 28 32 33 29 28 22 18 16 TRPM Estimated REPU Auto 75 3.683 2.263 1.397 1.000 4.111 4.111 7.35-14 792 3256 14 22 28 32 33 29 28 22 18 16 TRPM Estimated REPU 76 3.683 2.263 1.397 1.000 0.862 4.111 3.544 7.35-14 792 2807 14 22 28 32 33 29 28 22 18 16 TRPM Estimated REPU 77-78 3.380 2.002 1.390 1.000 0.791 3.900 3.085 7.35-14 792 2443 14 22 27 31 33 29 27 23 19 16 TRPM Estimated RX-2 71-74 3.683 2.263 1.397 1.000 3.900 3.900 165-13 894 3487 14 22 28 32 33 29 28 22 18 16 TRPM Estimated RX-3 72-75 3.683 2.263 1.397 1.000 3.700 3.700 155-13 904 3345 14 22 28 32 33 29 28 22 18 16 TRPM Estimated RX-3 76 3.683 2.263 1.397 1.000 0.862 3.727 3.213 175/70-13 904 2904 14 22 28 32 33 29 28 22 18 16 RX-3 77-78 3.380 2.002 1.390 1.000 0.791 3.727 2.949 175/70-13 904 2665 14 22 27 31 33 29 27 23 19 16 RX-3 78.5 3.380 2.077 1.390 1.000 0.791 3.727 2.949 175/70-13 904 2665 14 22 27 31 33 29 28 23 19 16 RX-4 73-75 3.683 2.263 1.397 1.000 3.900 3.900 BR70-13 873 3405 14 22 28 32 33 29 28 22 18 16 TRPM Estimated RX-4 76 3.683 2.263 1.397 1.000 0.862 3.636 3.134 BR70-13 873 2736 14 22 28 32 33 29 28 22 18 16 TRPM Estimated RX-4 77-78 3.380 2.002 1.390 1.000 0.791 3.636 2.877 BR70-13 873 2511 14 22 27 31 33 29 27 23 19 16 TRPM Estimated 03/12/01 US Spec Mazda Driveline Ratios 20:55 Rear Net Tire RPM @ -Countershaft & Mainshaft Gear Teeth-- Vehicle Year 1st 2nd 3rd 4th 5th Axle Final Tire Size RPM 60 MPH C1 C2 C3 C4 C5 M1 M2 M3 M4 M5 Tooth Count Certainty or Notes RX-4 78.5 3.380 2.077 1.390 1.000 0.791 3.636 2.877 195/70-13 873 2511 14 22 27 31 33 29 28 23 19 16 RX-7 79-83 3.674 2.218 1.433 1.000 0.825 3.909 3.227 185/70-13 892 2878 13 20 25 29 31 28 26 21 17 15 RX-7 83 3.674 2.218 1.433 1.000 0.825 3.909 3.227 195/60-14 891 2875 13 20 25 29 31 28 26 21 17 15 RX-7 auto 84 2.458 1.458 1.000 0.720 3.909 3.909 185/70-13 892 3487 RX-7 GSL-SE 84 3.622 2.186 1.419 1.000 0.758 4.083 3.097 205/60-14 878 2719 13 20 32 37 51 28 26 27 22 23 RX-7 84p 3.622 2.186 1.419 1.000 0.807 3.933 3.175 185/70-13 892 2832 13 20 32 37 50 28 26 27 22 24 RX-7 85 3.622 2.186 1.419 1.000 0.807 3.909 3.156 185/70-13 892 2815 13 20 32 37 50 28 26 27 22 24 RX-7 GSL-SE 85 3.622 2.186 1.419 1.000 0.715 4.077 2.914 205/60-14 851 2480 13 20 32 37 40 28 26 27 22 17 RX-7 mixed 85 3.622 2.186 1.419 1.000 0.697 4.444 3.099 205/55-14 910 2820 13 20 32 37 41 28 26 27 22 17 RX-7 Base 86-91 3.476 2.002 1.366 1.000 0.711 4.100 2.917 185/70-14 855 2494 15 21 32 37 52 31 25 26 22 22 RX-7 GXL 87-91 3.476 2.002 1.366 1.000 0.697 4.100 2.859 205/60-15 841 2404 15 21 32 37 41 31 25 26 22 17 RX-7 Turbo 87-91 3.483 2.015 1.391 1.000 0.719 4.100 2.948 205/55-16 828 2441 RX-7 Conv 88 RX-7 GTUs 89 3.476 2.002 1.366 1.000 0.758 4.300 3.261 205/55-16 828 2700 15 21 32 37 51 31 25 26 22 23 RX-7 93-95 3.483 2.015 1.391 1.000 0.719 4.100 2.948 225/50-16 829 2444 Miata 1.6L 90-93 3.137 1.888 1.331 1.000 0.814 4.300 3.501 185/60-14 910 3186 15 23 34 38 40 26 24 25 21 18 Miata 1.8L 90-97 3.137 1.888 1.331 1.000 0.750 4.100 3.076 185/60-14 910 2799 15 23 34 38 41 26 24 25 21 17 Miata 5-spd 99- 3.136 1.888 1.330 1.000 0.814 4.300 3.500 185/60-14 910 3185 Miata 6-spd 99- 3.760 2.269 1.645 1.257 1.000 3.909 3.295 195/50-15 913 3009 6th .843**** Miata auto 00- 4.100 185/60-14 I would be happy to include non-US models if anyone would submit that info.
05-30-06, 01:22 AM
#9
Here's a little number cruching I did to show the torque multiplication in each gear.
Code:
Tranny: 1st gen RX-7, Axle: 3.909 1st 2nd 3rd 4th 5th 3.674 2.218 1.433 1.000 0.825 3.909 3.909 3.909 3.909 3.909 -------------------------------------- 14.361 8.670 5.601 3.909 3.224
05-30-06, 01:33 AM
#10
Old [Sch|F]ool
Originally Posted by SerpentKing
I've spotted some threads about 2nd gen transmissions swaps into FBs. What's the advantage? Are the ratios different?
I would like a gearbox with a shorter 1st and 2nd gear, or closer ratios. I'm willing to modify. What are my options?
Usually when people swap in FC transmissions, they are putting in Turbo II units, which are much stronger. Only required for high powered turbo or nitrous engines. There's no specific advantage to putting a N/A FC transmission in, they are identical internally so there's no strength advantage, the ratios aren't particularly better (but not horribly worse, either) so the main reason for using one is for practical reasons, like not being able to find a 1st-gen unit easily.
05-30-06, 01:08 PM
#11
Dude, that miata drivetrain interchange site is awesome. It has speedo gear change info!
that could help if you change your rear ratio and tires as I would like to do. I'll just have to crunch the numbers and figure out what kind of speedo gear I need for a 4.1 rear and 205/60/13 tires
How do I figure that out?
Jon
that could help if you change your rear ratio and tires as I would like to do. I'll just have to crunch the numbers and figure out what kind of speedo gear I need for a 4.1 rear and 205/60/13 tires
How do I figure that out?
Jon
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