3.636 or 3.9 R&P? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 05-23-2010, 12:19 PM   #1
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Default 3.636 or 3.9 R&P?

I am undecided right now, I went for a 7 hour drive yesterday and man does the 5 speed suck with 4.10's. I was driving 120km/h and im at 4000rpm...does that ever go through gas pretty quick. So I seen the 3.636 ring and pinion on miata roadster website, price seems ok I guess, and it comes with everything necessary to do the swap. Whats up with the distance piece? Is that needed? Its impossible to find a 3.636 R&P I have searched everywhere! I found some 3.9 R&P but then I have so source a speedogear and its to much bullshit for me. What do you think would be better a 3.636 or 3.9 im running 20lbs of boost right now in the next month or so I will be at 30lbs. I also do use the highway alot. Would the 3.9 cut it for me or should i just go with the 3.636? Thanks, Mike.
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Old 05-23-2010, 03:05 PM   #2
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3.9 would work for ya!

and all you gotta do is find a 3.9 torsen compleate unit out of a NB excluding MSMs and 03s.
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Old 05-23-2010, 04:07 PM   #3
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I found a couple on car-part.com...all in the states though im going to give them a call tuesday and see if it can be shipped. Im assuming i dont need no distance piece with a 3.9 and i can just get the speedogear at a mazda dealership.
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Old 05-23-2010, 04:20 PM   #4
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Originally Posted by stranges12712 View Post
I found a couple on car-part.com...all in the states though im going to give them a call tuesday and see if it can be shipped. Im assuming i dont need no distance piece with a 3.9 and i can just get the speedogear at a mazda dealership.
Won Ton is going to think I have something against him (I don't). If I were you, I'd look for a 6 speed transmission.

That's what I drive (with a 3.63 gearset I bought) and it has been the only way I've been satisfied with the rpms at cruising speeds on the highway.
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Old 05-23-2010, 04:42 PM   #5
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Won Ton is going to think I have something against him (I don't). If I were you, I'd look for a 6 speed transmission.

That's what I drive (with a 3.63 gearset I bought) and it has been the only way I've been satisfied with the rpms at cruising speeds on the highway.
I have been looking they want 900$ Canadian over here for one, and thats if you can source it. I found one its about 200km from me. But first i want to do my diff ratio i just bought the torsen 4.10s last year i should have went with the 3.9s. But i will be getting a 6 speed once i grenade my 5 speed.
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Old 05-23-2010, 04:48 PM   #6
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Originally Posted by Rafa View Post
If I were you, I'd look for a 6 speed transmission.
I'm confused.

The guy is looking for a way to lower RPM on the freeway, right? Assuming the same R&P ratio for both (be it 3.636 or 3.9) a six-speed will result in a higher cruising RPM than a five-speed.
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Old 05-23-2010, 04:59 PM   #7
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Originally Posted by Joe Perez View Post
I'm confused.

The guy is looking for a way to lower RPM on the freeway, right? Assuming the same R&P ratio for both (be it 3.636 or 3.9) a six-speed will result in a higher cruising RPM than a five-speed.
This.


Go 3.63's, help a bit with traction down low and much lower RPM's on the highway. I got a set myself that I'll be installing shortly now that schools out.
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Old 05-23-2010, 05:13 PM   #8
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Originally Posted by mikeflys1 View Post
This.


Go 3.63's, help a bit with traction down low and much lower RPM's on the highway. I got a set myself that I'll be installing shortly now that schools out.

+1.

This has been my experience so far.
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Old 05-23-2010, 05:16 PM   #9
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Originally Posted by stranges12712 View Post
I have been looking they want 900$ Canadian over here for one, and thats if you can source it. I found one its about 200km from me. But first i want to do my diff ratio i just bought the torsen 4.10s last year i should have went with the 3.9s. But i will be getting a 6 speed once i grenade my 5 speed.
I understand. If you're going to keep your 5 speed for the time being; why not install the 3.63 gearset? It made a noticeable difference in my car when I was using it.

I blew the 5 speed later on and had to change to a 6 speed. I just kept the same diff.
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Old 05-23-2010, 05:50 PM   #10
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Originally Posted by Rafa View Post
I understand. If you're going to keep your 5 speed for the time being; why not install the 3.63 gearset? It made a noticeable difference in my car when I was using it.

I blew the 5 speed later on and had to change to a 6 speed. I just kept the same diff.
yeah but he doesnt want to criuse at 3k+ rpm so a 6 speed will put him right back where he started from.
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Old 05-23-2010, 05:54 PM   #11
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3.63 is worth the money if you street the car. I could use a little closer gearing on the track (250whp) but its worth it to cruise at 80mph at low rpm.
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Old 05-23-2010, 06:24 PM   #12
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20lbs of boost on a 2871 and your still using a 5-speed? 3.6 + a 6-speed would be a good street option.
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Old 05-23-2010, 06:51 PM   #13
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Quote:
Originally Posted by Rafa View Post
Won Ton is going to think I have something against him (I don't). If I were you, I'd look for a 6 speed transmission.

That's what I drive (with a 3.63 gearset I bought) and it has been the only way I've been satisfied with the rpms at cruising speeds on the highway.
i know ya dont buddy.....i was just saying grab a 3.9 unit cause its already together over buying a torsen, then buying the gears and then paying sombody to install em.

Quote:
Originally Posted by Joe Perez View Post
I'm confused.

The guy is looking for a way to lower RPM on the freeway, right? Assuming the same R&P ratio for both (be it 3.636 or 3.9) a six-speed will result in a higher cruising RPM than a five-speed.
its all in the final drive gear.

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Originally Posted by thesnowboarder View Post
20lbs of boost on a 2871 and your still using a 5-speed? 3.6 + a 6-speed would be a good street option.
when the the 6-speed, 3.9 combo i had was running fine, i loved it. so much better than 5-speed + 4.10(1st gear seemed a lil shorter) id love to have a 3.63 R&P that would be teh sex.
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Old 05-23-2010, 07:02 PM   #14
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Originally Posted by WonTon View Post
i know ya dont buddy.....i was just saying grab a 3.9 unit cause its already together over buying a torsen, then buying the gears and then paying sombody to install em.

I totally agree with you.
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Old 05-23-2010, 07:25 PM   #15
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Originally Posted by hustler View Post
3.63 is worth the money if you street the car. I could use a little closer gearing on the track (250whp) but its worth it to cruise at 80mph at low rpm.
I figure I'll eventually do the 3.636. The gearing works out to basically the same as my E36, which I like.

With a 3.90:
1st 2nd 3rd 4th 5th
Ratio: 3.14 1.89 1.33 1.00 0.81

RPM 1st 2nd 3rd 4th 5th
750 4 7 10 13 16
1000 6 9 13 18 22
1250 7 12 16 22 27
1500 8 14 20 26 32
1750 10 16 23 31 38
2000 11 19 26 35 43
2250 13 21 30 39 49
2500 14 23 33 44 54
2750 15 26 36 48 59
3000 17 28 40 53 65
3250 18 30 43 57 70
3500 20 33 46 61 75
3750 21 35 49 66 81
4000 22 37 53 70 86
4250 24 40 56 75 92
4500 25 42 59 79 97
4750 27 44 63 83 102
5000 28 46 66 88 108
5250 29 49 69 92 113
5500 31 51 73 97 119
5750 32 53 76 101 124
6000 34 56 79 105 129
6250 35 58 82 110 135
6500 36 60 86 114 140
6750 38 63 89 118 146
7000 39 65 92 123 151


With a 3.636:
1st 2nd 3rd 4th 5th
Ratio: 3.14 1.89 1.33 1.00 0.81

RPM 1st 2nd 3rd 4th 5th
750 5 7 11 14 17
1000 6 10 14 19 23
1250 8 12 18 24 29
1500 9 15 21 28 35
1750 11 17 25 33 40
2000 12 20 28 38 46
2250 14 22 32 42 52
2500 15 25 35 47 58
2750 17 27 39 52 64
3000 18 30 42 56 69
3250 20 32 46 61 75
3500 21 35 50 66 81
3750 23 37 53 71 87
4000 24 40 57 75 92
4250 26 42 60 80 98
4500 27 45 64 85 104
4750 29 47 67 89 110
5000 30 50 71 94 116
5250 32 52 74 99 121
5500 33 55 78 104 127
5750 35 57 81 108 133
6000 36 60 85 113 139
6250 38 62 88 118 145
6500 39 65 92 122 150
6750 41 67 96 127 156
7000 42 70 99 132 162
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Old 05-23-2010, 07:34 PM   #16
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um i know your not doing 150 or 160 mph in 4th gear man the chart is off on something forsure
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Old 05-23-2010, 07:48 PM   #17
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Quote:
Originally Posted by Joe Perez View Post
I'm confused.

The guy is looking for a way to lower RPM on the freeway, right? Assuming the same R&P ratio for both (be it 3.636 or 3.9) a six-speed will result in a higher cruising RPM than a five-speed.
Yes. Im either going 6 speed or quaife gearing.
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Old 05-23-2010, 07:49 PM   #18
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Originally Posted by thesnowboarder View Post
20lbs of boost on a 2871 and your still using a 5-speed? 3.6 + a 6-speed would be a good street option.
Yup its been a year and a bit and she still hasnt blown
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Old 05-23-2010, 07:50 PM   #19
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Originally Posted by WonTon View Post
i know ya dont buddy.....i was just saying grab a 3.9 unit cause its already together over buying a torsen, then buying the gears and then paying sombody to install em.



its all in the final drive gear.



when the the 6-speed, 3.9 combo i had was running fine, i loved it. so much better than 5-speed + 4.10(1st gear seemed a lil shorter) id love to have a 3.63 R&P that would be teh sex.
Il be installing them...were doing rear diffs in school right now so the teacher would be glad to help me out, if not il get the transmission guy at work to throw them in.
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Old 05-23-2010, 08:30 PM   #20
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get the 3.63 and be done with it. assembly is the only point agianst getting it at your powerlvl and you have effectively made that a moot point.
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