VX final drive swap: Who to believe?

[some_other_dave]

The first link has at least some errors in the 88-91 section. I know that the HF transmission has taller gears and a taller final drive than the DX transmission does. That list shows the same final drive as the DX.

Here's another BBS post listing gear ratios for the 88-91 CRXes. I believe that the Civics had the same ratios:

The CRX Community Forum :: View topic - D-Series Clutch and Gear Ratio information

-soD

[thebrad]

Originally Posted by PaleMelanesian

175/70-13 vs 185/65-14 is almost exactly the same diameter. Only the 1996 had the 13", the 97 and up had 14" steelies. Bruce, what size wheels and tires do you have? Brad, what do you have? And what is your rpm at 60 mph?

Here are a couple of sources. They have some errors, and disagree with each other in some places. That's why I posted 2, but I still take the real-world results from my DX and Bruce's HX with more authority.

Reference: Transmission Specs - ClubCivic.com - Honda Civic Forum
6G Civic Trim Differences - Honda-Tech

I took her out yesterday and did 60 momentarily, Scangauge was putting out 231x when I looked down. I'll try again tonight with a more steady MPH rating to confirm. My Civic has a 97 DX tranny according to the VIN on the housing.

[thebrad]

Yeah it's definitely between 2290-2350 at 60 mph in fifth gear.

[Daveedo]

Do the VX gears...if you are wanting to improve fuel mileage. I used to get annoyed with people grabbing the 5th gear out of junkyard crx hf cars for their SI or DX cause that was one less spare transmission for me. I'd do around 1800 rpms at 60mph. 3rd, 4th, and 5th were overdrive gears!

As for the HX vtec...from what I've gathered is that the vtec-e doesn't allow the valves to all open all the way until the v-tec is engaged then they open all the valves all the way. At lower rpms you don't need the valves to open all the way if you are looking for economy.

Also, in rebuilding my HX transmission I found a number of sites (no linky at the moment) that showed the HX having lower gearing (numerically) than the other civics. Also, the VX was lower and my crx hf was the lowest of all

[thebrad]

Good news guys! I found the gear ratios in the Honda service manuals under design specifications by sheer luck.

So here they are

D16Y5 (HX)
1 - 3.250
2 - 1.782
3 - 1.172
4 - 0.909
5 - 0.702
R - 3.153
Ratio: 3.722

D16Y7 (Civic CX/DX)
See above, all are the same except for the ratio unless you own a coupes or sedans, then it's 4.058

D16Y8 (Civic EX/LX, I think)
1 - 3.250
2 - 1.909
3 - 1.250
4 - .909
5 - .702
R - 3.153
Ratio: 4.250

I'll try to get HF/VX later for y'all, let's get this thread going again now that I have access to OEM data.

[PaleMelanesian]

I'm pretty sure the LX is also D16Y7, leaving the EX alone with the Y8.

[Christ]

The CRX HF has two options for gearing.. the final drive was longer if it's a non-cali model, something like 2.95, and 3.25 for california models.

Awhile back, I did a thing w/ a gear calculator to make the longest possible honda transmission that could actually be built.. I can't remember exactly what gears it used, but the 2.95 FD from the CRX HF wasn't an option, because it's a small bearing case, and the gears from the large bearing cases in the hydro models won't fit with it.

I'll see if I can find it the next time I fire up the old computer, I might still have the text file from it.

Also - the 88-91 has more than 3 5 speed trannys..

There are:
DX, LX, Si, HF cali, and HF 49, and EX (90-91 Only) For USDM

Then there are EDM and JDM and UKDM and AuDM options, which include the VT and VTi, GT and GTi (I think) and ZC models, and the Si-R. Each of which may have had it's own transmission as well.

The DX and LX for years have been touted as being the same, but they're not. The gears almost match up when you add in the FD, but they're all different.

[thebrad]

92-95 Civic transmission gears
As printed in a 1992 Civic service manual

D15B8/D15Z1
1 - 3.250
2 - 1.761
3 - 1.066
4 - 0.852
5 - 0.702
R - 3.153
GR: 3.250

D15B7
1 - 3.250
2 - 1.761
3 - 1.172
4 - 0.909
5 - 0.702
R - 3.153
GR: 3.888 (hatch)/ 4.058 (sedan)

D16Z6
1 - 3.250
2 - 1.900
3 - 1.250
4 - 0.909
5 - 0.702
R - 3.153
GR: 4.250

1988-1991 CRX Gear ratios
As posted in a 1991 service manual

HF
Primary reduction - 1.000
1 - 3.250
2 - 1.650
3 - 1.033
4 - 0.823
5 - 0.694
R - 3.153
Final reduction - 2.954 (49 st) / 3.250 (CA)

Std and Si
Primary reduction - 1.000
1 - 3.250
2 - 1.894
3 - 1.259
4 - 0.937
5 - 0.771
R - 3.153
Final reduction - 3.888 (Std) / 4.250 (Si)

2000 - 2006 Insight Gear ratios
As posted in a 2000 service manual

1 - 3.461
2 - 1.750
3 - 1.096
4 - 0.857
5 - 0.710
R - 3.230
Final reduction - 3.208

Anyone interested in automatic ratios? I'm assuming those gears can be used as well, they are all listed as single helical gears.

[Christ]

The Std and Si setups is wrong... STD is a 4spd tranny.