91 civic si

[Rusty94cx]

There is a post on hondatech on how to Id one you could have a custom trans. Some hf gears in a si case for quick launch and good economy. I've seen it.

[Stacygifford]

Rusty, That is possible. The gears match up with the 94+ integra LS (hydraulic trans)
This car has a cable trans that only came in integras 90-93, but is geared completely different. I know that the 93 Transmission Internals can be interchanged with the 94+ internals, but I don't think the other years can...

The motor (B18b1) came out of a 94+ LS
Trans 90-93... (gears seem to match up with the 94+)
Ecu 90-93...

It might just be a custom gear set or the ls but it is soon to be my only car so i have to figure it out ASAP
In the USA there are no factory honda cable trans geared that high. I am worried it is JDM

[War_Wagon]

Originally Posted by some_other_dave

If you're looking at the speedo and the tach, the wheels and tires don't come into account. They can change your actual speed, but since the speedometer really just reads off the output shaft of the transmission the wheels are a non-issue.

As to what you've got, I really don't know.

-soD

Yup, I totally missed that fact. Your actual speed and the distance your ODO says you travelled would be incorrect, but your speedometer wouldn't know that, it would still show the "correct" speed. Good catch!

[Stacygifford]

Originally Posted by War_Wagon

Yup, I totally missed that fact. Your actual speed and the distance your ODO says you travelled would be incorrect, but your speedometer wouldn't know that, it would still show the "correct" speed. Good catch!

I forgot to mention the speedometer is the only thing in the car that dsnt work (aside from third gear, that is) I used 2 GPSs

[War_Wagon]

Cripes lol. Ok so if the speed is provided by GPS, and the tach is correct, then the tire size still doesn't matter, just like if the speedo was working, even though the speedo would have been reading a correct (to it) but inaccurate speed? I think. Geez I'm getting a headache.

[Stacygifford]

Okay guy's I am back! Sorry it has taken me so long to get back to you... I have had more stuff come up than you can imagine.

But it's all good! I spent around $800 and had the transmission of fully rebuilt. Within the next few weeks I will be getting a check for $1200. So here's the plan. I want to swap in a lean burn d15.. As a way to keep the cable clutch I could stick with a HF trans, I found one for $300 and a only 95,000 miles.

But I don't know what all I need... most ppl do the opposite of this swap.. Will I need anything other than the motor, trans, Factory Motor mounts engine wiring harness, PO 7 ECU. And factory axles?

[slownugly]

Gota convert it to obd1. You can get conversion harnesses but some custom wiring is going to have to be done. Others who have done this swap or any obd0-obd1 swap will know best

[Stacygifford]

Originally Posted by slownugly

Gota convert it to obd1. You can get conversion harnesses but some custom wiring is going to have to be done. Others who have done this swap or any obd0-obd1 swap will know best

OK, good news! I just found a motor, trans and ecu out of an 89 crx . No, its not the hf... but its only $400

But a buddy of mine just pulled it, and it is a direct swap. the only problem is, it is dpfi, mine is mpfi. so my options are, swap to mpfi and get a new ecu, and intake manifold. or redo/get a new wiring harness.

[02ws6]

Personally, I wouldn't fix what isn't broken.

But if you do want to convert this thing over to get better mileage you have many options to choose from.

D15Z1, D16Y5 are the two that come to mind the quickest.. The Y5 will be the more powerful of the two engines but is an OBD2 engine. Thankfully, honda is awesome about their interchangability and you can run OBD1 as well. Which will be more simple to swap with the wiring. The D15B6 is still a neat little engine but with rebuild parts diminishing (rod bearings are discontinued) and only 62hp it just doesn't mount up to the other two guy IMO.

Before you go spending $400 on a single cam engine that more than likely has mileage well into the six digit area (Not to mention if its DPFI its a 1.5liter engine D15B2 that isn't known for its pep or mileage) you may want to explore your other options.

If I had that kind of money to spend I'd look into buying a JDM D15B VTEC engine.. 3 stages of Vtec which can be run with a chipped P72 ECU so that you can get the best of both worlds in power and economy. 130hp and 50+mpg.. Makes me want to sell my setup and go this route.. lol

Whatever you do, definately stick with MPFI and OBD1. It has the most support for tuning and is the most common for the wiring swaps. The intake manifolds are interchangable btw..

[Stacygifford]

I found the intake manifold from a d15b7, and the obd1 ecu, for $50 so that should get me into obd1 and mpfi for next to no cost!

that is if i can get it to work.