swizz977

what transmission is supposed to come with the jdm d15b obd1 vtec and the 0bd2 3 stage vtec? im only asking because usually sellers sell them without the transmissions for some reason

TomCat39

I couldn't tell you what the Japanese transmissions were but you really only have to make sure the motor was from a manual if you have a manual and an automatic if you have an automatic. Any d-series transmission will bolt up to either of those motors.

TomCat39

I suspect this is the complete manual setup from japan I just found on ebay:

This auction is for a used 96-00 honda civic ex 1.5l sohc dual 3 stage v-tec obd2 d15b engine, manual 5 speed transmisison code s40 and ecu 37820-p2j-j11 jdm d15b.

Taking a close look at the casting stamp on the tranny it's a B000 so that would be the SI equivalent with the larger diff bearings. Don't know what final drive they used in Japan though.

94EG8

The OBD1 power version uses a '92 - '95 EX/Si trans. The OBD1 Vtec-e version (IE VX engine) uses a VX transmission. The OBD2 3 stage version I'm not sure about, I'm thinking HX though, you can't tell just by the stamp as the HX uses the same B000 "big bearing" case as the EX/Si models.

TomCat39

Stupid edit button right next to the quote button. Sorry about that.

I thought the EX and SI had different final drives so are not the same tranny but both being B000 big bearing trannies?

94EG8

As far as the '92 - '95 transmissions go they're identical other than the Del Sol Si has a slightly lower 5th. In terms of '96 - '00 The Si trans is a B-series and obviously totally different, the EX trans is similar to a '92 - '95 EX/Si trans other than it uses steel shift forks and 2nd gear is slightly lower (very slightly, it quite literally amounts to a rounding error)

TomCat39

Yeah that's weird. I see on the chart that it's mainly a difference on 5th gear.

Yet I could of sworn when I was looking into the 92-95 D series transmissions that people were saying there was a bit of difference between the EX and the SI and people were looking for the SI over the EX but the EX was a good second place contender for race. Not that I've run a quarter mile before but I am skeptical you'd be able to hit 5th gear before the finish line even with the shorter gearing of the EX/SI.

Then the HX looks like it places in between the CX/VX and the EX/SI kind of a hybrid decent fuel efficiency with fair launch capabilities. Being you believe the HX is the one they used on the JDM 3 stage motor, I wonder why they went in the middle and didn't use the taller CX/VX for the higher fuel economy?

94EG8

Perhaps you're thinking of the DX/LX? Still geared long but better than a CX/VX.

You'd never hit 5th, with CX/VX you'd likely not even hit 4th.

The DX/LX is in there too, I believe the HX is somewhere between it and the CX/VX. Why they didn't go with something more fuel efficient is most likely because they were still trying to make it a bit sporty at the same time.

TomCat39

Not really, from experience I've found the 92-95 DX/LX to be negligible in feel to the CX/VX. But the fuel efficiency is noticeable even if it's small.That's what I kind of figured, that's why I'm not sure why I saw people saying EX is a decent second to the SI. You never hit 5th to see a difference between the two when racing. And if you are top speed racing then you'd want the CX/VX anyway with the speed limiter turned off.Yeah on the 92-95 DX/LX the HX falls in between. Makes sense being it does have the wild cam too so sporty yet fuel efficient when not going all out. By the looks of things the HX is the same thing as the 96-01 CX/DX/LX. At least in 96-01 they simplified the hydro d-series transmissions.

I must say they sure didn't make things easy with the d-series hydro trannies. Not only do you have to know the trim but the year can make a huge difference too. And even then you sometimes have to slap it into reverse and spin the input shaft and count differential revolutions to see what your practical drive ratio is.

94EG8

Don't forget if you're in Canada the CX trans is the same as the DX/LX (and also remember that the Canadian EX is also a DX/LX trans) The Canadian VX is indeed the same long geared transmission as the US model though.

TomCat39

Hmmm that's really wild. I have a Canadian CX (no air bags, d15b7 not b8 and I'm not sure what the other tell tale sign was....) And I dropped a 93 DX (did the practical ratio in reverse to ID it as the DX/LX) and I lost top speed and even my second doesn't wind out like it used to and lost 1-2 MPG. I used to hit 110 kph in second on the freeway before hitting the rev limiter of 6500 now I hit 100 kph (62.5 mph so people don't think I'm being insanely crazy on the freeway). I'm gonna have to go down to the parkade and do the reverse gear ratio on my spare tranny, the one I thought was a CX/VX. You got me wondering now. Maybe it isn't a Canadian CX I bought used?

The Canadian EX being the same as the US DX/LX.... That is probably where the posts I was reading was coming from with the EX to SI bit.

swizz977

hey if i wana swap a d15b obd2 vtec motor in my 2000 civic dx non vtec what do i need besides the motor and computer do i need a new harness?

94EG8

You'll need to add in the wiring for vtec and the EGR valve.