Hi there - I'm new to the site, please be gentle with me!

I have a little project on the go which requires me to seriously look at my gearing. I currently have an M2J4 5-spd manual transmission bolted to an F22a. The engine ousted for an import H23a VTEC (bluetop) and I'm going to run some big boost on it so I'm looking for a tranny with much longer legs.

I have come across an H2U5 which is from an Accord as far as I can tell. I've figured out how to check whether this is US or JDM but haven't got around to that bit yet.

My question(s): does anyone know what the ratios are on this box? Has anyone gone so far as to drop one of these boxes into a lude?

Thanks for your help!

 

Here are some ratios: https://honda-tech.com/zero...age=2
yours isn't in there, but you should consider the prelude S tranny, you can find them dirt cheap, and if mated to an H22(like mine) it will hit 70mph in second(at 7500rpm), and over 100 in third, that should be long enough for you

 

Thanks GB,

So you'd have the M2L5 right? Mine is the M2L4 which is the Australian S tranny. But the final drive ratio is the same as the Australian Si and Vtir trannies! I'd love to get my hands on an M2L5 but can't seem to find much over here!

 

Yes, I have an M2L5, and sorry I didn't realize you were in Australia, but here are a couple more links for you.
https://honda-tech.com/zerothread?id=1438029 and
https://honda-tech.com/zerothread?id=758902

 

Awesome - thanks again! Those links are gold!
I'm not sure how I ended up with the H2U5 at our local Honda wrecker coz I'm sure it's an import but I don't know much about Accords.
It seems to me that the H2A5 mentioned in the top thread will be quite similar to the H2U5. I basically just want the 4.062 final drive but from what you've dragged my eyes across this box will be a good matchup.

 

Do you really need longer gearing? Roger/Md23vtec uses a pretty stock M2s4 in his 10sec Prelude.

 

The H2U5 and H2A5 have the same ratios. Though, they're the longest geared trannys for the H/F series (I'm talking 120+mph in third).

1st: 3.307
2nd: 1.809
3rd: 1.185
4th: 0.870
5th: 0.685
Final: 4.062

The cases are the only difference I've found. The H2A5 doesn't have the povisions for the studs to fit Prelude motor mounts but the H2U5 does.

 

500 3 5 7 10 13
600 3 6 9 12 15
700 4 7 10 14 18
800 4 8 12 16 20
900 5 9 13 18 23
1000 5 9 14 20 25
1100 6 10 16 22 28
1200 6 11 17 24 30
1300 7 12 19 26 33
1400 7 13 20 28 35
1500 8 14 22 30 38
1600 8 15 23 32 40
1700 9 16 25 34 43
1800 9 17 26 36 45
1900 10 18 28 37 48
2000 10 19 29 39 50
2100 11 20 30 41 53
2200 11 21 32 43 55
2300 12 22 33 45 58
2400 12 23 35 47 60
2500 13 24 36 49 63
2600 13 25 38 51 65
2700 14 26 39 53 68
2800 15 27 41 55 70
2900 15 28 42 57 73
3000 16 28 43 59 75
3100 16 29 45 61 78
3200 17 30 46 63 80
3300 17 31 48 65 83
3400 18 32 49 67 85
3500 18 33 51 69 88
3600 19 34 52 71 90
3700 19 35 54 73 93
3800 20 36 55 75 95
3900 20 37 57 77 98
4000 21 38 58 79 100
4100 21 39 59 81 103
4200 22 40 61 83 105
4300 22 41 62 85 108
4400 23 42 64 87 110
4500 23 43 65 89 113
4600 24 44 67 91 115
4700 24 45 68 93 118
4800 25 46 70 95 120
4900 25 47 71 97 123
5000 26 47 72 99 125
5100 26 48 74 101 128
5200 27 49 75 103 130
5300 28 50 77 105 133
5400 28 51 78 107 135
5500 29 52 80 109 138
5600 29 53 81 111 140
5700 30 54 83 112 143
5800 30 55 84 114 145
5900 31 56 85 116 148
6000 31 57 87 118 150
6100 32 58 88 120 153
6200 32 59 90 122 155
6300 33 60 91 124 158
6400 33 61 93 126 160
6500 34 62 94 128 163
6600 34 63 96 130 165
6700 35 64 97 132 168
6800 35 65 99 134 170
6900 36 65 100 136 173
7000 36 66 101 138 175
7100 37 67 103 140 178
7200 37 68 104 142 180
7300 38 69 106 144 183
7400 38 70 107 146 185
I just ran a gear ratio on 55 series 15s

 

Hmmm stock (ish) M2S4 attached to H23A bluetop (which I assume to be boosted) = 10sec Prelude?
This is along the lines of my thinking! Do you know what psi he is running?

I have access to the M2S4 tranny if I want it, but I compared the ratios and it just seems to me that with that short gearing on the boosted bluetop I'd be spending more time out of gear while changing than I do in gear trying to launch the thing.
Obviously not if Roger is running 10s with a similar setup?

Gogunkerilla, that's exactly what I was after - thanks! Good info too about the mounting. There seems to be more info about for the H2A5 than the H2U5.

92hondalude - that's pretty comprehensive! I'm assuming those are in miles per hour yeah?