Honda Manual Transmission Specifications & Gear Ratios

[logix]

Originally Posted by Bense

Don't bother wasting your time on him. He's got a bad attitude, as if he's some sort of expert on these transmissions, and modifying hondas for efficiency. Except he's not the expert. I am.

Reverse engineering D trans. My trans shop in 2008.




I've spent over 60 hours this past week sifting through tons of honda data specifically for F/H trans. If anyone else has any questions, I'll be more than happy to answer them.

Except for you California98Civic. Your attitude sucks too much.

First of all i envy you work area!
I gotta question can i put a 1992-1995 VX/CX trans in my 05 hx? If so how easy is it ? and I gotta guy that says hes done it before what should i look to pay him? any suggestions on sources for the transmission? Also any tips thoughts or anything I should know?
Thank you kindly

[California98Civic]

Originally Posted by logix

First of all i envy you work area!
I gotta question can i put a 1992-1995 VX/CX trans in my 05 hx? If so how easy is it ? and I gotta guy that says hes done it before what should i look to pay him? any suggestions on sources for the transmission? Also any tips thoughts or anything I should know?
Thank you kindly

Bense will give you his own reply I'm sure. But I will say that supposedly this can be done (I have not, nor have I personally met anyone who claims to have done it). But the swap of the 5th gen trans to a 7th gen car will be complicated by the differences in shifter linkages and the seventh gen Civic's immobilizer, if I understand correctly. Wiring and shifter adaptation will be required, but they bolt up.

[logix]

Originally Posted by California98Civic

Bense will give you his own reply I'm sure. But I will say that supposedly this can be done (I have not, nor have I personally met anyone who claims to have done it). But the swap of the 5th gen trans to a 7th gen car will be complicated by the differences in shifter linkages and the seventh gen Civic's immobilizer, if I understand correctly. Wiring and shifter adaptation will be required, but they bolt up.

This is a better question what can be done trans side for more mpg in my 7th gen?. is there better swaps with a taller last gear with more compatibility? Have people been able to retro fit with a taller final gearing? Sorry to ask you two seem to be the most knoweldgeable on the net.
Thank you kindly,
Max

[hamsterpower]

Between the 6th and 8th generation Civics, Honda reversed the rotation of the engines. So no this will not work unless the corresponding engine is also swapped. D and B series are not compatible with K series without a full swap.

[California98Civic]

Originally Posted by hamsterpower

Between the 6th and 8th generation Civics, Honda reversed the rotation of the engines. ...

He says his car is an '05 HX, which makes it 7th generation, which was before the rotation reversal.

Oh, and on the question of other possibilities for a trans mod... an obvious simple mod would be taller wheel/tire combos. You have the 4x100 bolt pattern and 14" wheels were probably stock on your car (depending on trim level, I think). So swap to a 15" wheel an taller tires, the effect is taller gearing. I am running 15" seven hole rims from a first gen MINI.

[logix]

Originally Posted by California98Civic

He says his car is an '05 HX, which makes it 7th generation, which was before the rotation reversal.

Correct

[Ecky]

Thought I'd throw these up here after doing some research. The HCH1 and CR-Z gearboxes have both proven to be almost completely interchangeable with the Insight's. Chances are decent the Fit's gearbox has interchangeable internals but a different, more laterally compact shape. The bolt pattern for the 2015+ Fit and 2016+ Civic are likely different but some gears may be interchangeable with the CR-Z box.

Insight:
1st - 3.462
2nd - 1.750
3rd - 1.096
4th - 0.857
5th - 0.711
Final drive ratio - 3.208
Tire size - 165/65r14 (899 revs/mile)

2003 Civic Hybrid:
1st - 3.462
2nd - 1.870
3rd - 1.241
4th - 0.912
5th - 0.711
Final drive - 3.600
Tire size - 185/70r14 (834 revs/mile)

2007 Fit:
1st - 3.462
2nd - 1.870
3rd - 1.321
4th - 0.970
5th - 0.757
Final drive - 4.294
Tire size - 175/65r14 (879 revs/mile)

2009 Fit:
1st - 3.308
2nd - 1.870
3rd - 1.303
4th - 0.949
5th - 0.727
Final drive - 4.625
Tire size - 175/65r15 (842 revs/mile)

2011 CR-Z:
1st - 3.143
2nd - 1.870
3rd - 1.303
4th - 1.054
5th - 0.854
6th - 0.689
Final drive - 4.29
Tire size - 195/55r16 (825 revs/mile)

2015 Honda Fit: (L15B engine)
1st - 3.462
2nd - 1.870
3rd - 1.235
4th - 0.949
5th - 0.810
6th - 0.727
Final drive - 4.62
Tire size - 185/55r16 (840 revs/mile)

2016 Honda Civic: (L15B engine)
1st - 3.643 (probably higher because the Civic is heavier)
2nd - 2.080
3rd - 1.361
4th - 1.024
5th - 0.830
6th - 0.686
Final drive - 4.105
Tire size - 215/55r16 (797 revs/mile)

[Ecky]

For those who care about K-series Honda engines, the Accord 5 speed is essentially the same case as the TSX 6 speed, just with a spacer in place of the 6th gear. The gears from any K24A or K24Z-mated transmission are interchangeable, but I believe the K24W gearboxes are different.

2003-2007 Accord:
1st - 3.266
2nd - 1.769
3rd - 1.147
4th - 0.872
5th - 0.659
Final drive - 4.389

2003 Accord (CL7/CL9) UK spec:
1st - 3.266
2nd - 1.769
3rd - 1.121
4th - 0.972
5th - 0.780
Final drive - 4.105

2004-2008 Acura TSX:
1st - 3.266
2nd - 1.88
3rd - 1.355
4th - 1.028
5th - 0.825
6th - 0.659
Final drive - 4.764
Casing is made of magnesium for weight savings and reduced noise.

2012-2015 Civic Si:
1st - 3.266
2nd - 2.040
3rd - 1.429
4th - 1.073
5th - 0.830
6th - 0.647
Final drive - 4.764
Has a limited slip differential.

The ideal Frankenstein gearbox is thus an 04-08 TSX gearbox with a UK Accord final drive and a 2012 Civic Si 6th gear - assuming you don't have custom gears made. All Si's come with factory LSDs - probably not something most ecomodders would want but worth noting.

[mpg_numbers_guy]

Does this mean you could swap in a CR-Z transmission into an Insight and replace the final drive with the Insight's final drive?

[Ecky]

Originally Posted by mpg_numbers_guy

Does this mean you could swap in a CR-Z transmission into an Insight and replace the final drive with the Insight's final drive?

I want to say... maybe but probably not. The CR-Z box will bolt up but chances are good the internals are different, it being a 6 speed. The final drive *might* fit but don't hold your breath. I'd love to see someone try anyway though.

The Accord 5 speed is an exception because it's actually a 6 speed box missing its 6th gear.

EDIT: I sent an email to MFactory, a maker of custom Honda gearsets, to see if they know. I'll update this thread if I ever get a response.