Diff Swappability

[James]

Anyone know whether you can swap any civic diff's into the turbo box? Im after a shorter final drive cause of my 15" wheels making my gears sooo long.

Maybe if anyone has a box in bits hanging around at their place or something we could jack up a civic diff to see if they are compatible.

BTW EB an EN civics both had diff ratios in the high 4's 4.93:1 or something was the highest

[Mark_Moddy]

The 3 door EN Civic had a diff ratio of 4.25.
The EN wagon had a diff ratio of 4.65
They were both 5 speed.

The 4 speed EB gearbox has a 4.93 diff ratio.
The rare EB "RS" 5 speed had a 4.71 diff ratio.

[James]

Thats all well and good but doesnt really help

There is a table around this forum somewhere with all the gear and final ratios of all cars around that era.

[tegracer]

I think what mark was saying was swap out the t1 or t2 box with one from an en , which are interchangable

to change the diff by which I assume you mean the final drive you need to change the crownwheel and pinion

the 4 speed pinion will definitely not fit , the 5 speed en pinion will fit in a t1 but unsure about a t2 box

We run an en 3 door box in a t1 powered eb with 15's and problem is solved

[James]

The thing is, you cant just bolt a civic box onto a t2 because they used the flywheel from the latter model civics. (You can if you use the flywheel that came with the box)

And since I have a lightened flywheel and a half-decent clutch (and its much easier to get performance clutches) for my T2 box  I was exploring other alternatives than swapping on an EN box and flywheel.

So what clutch and flywheel are you guys running in yours? T1 I guess.

[tegracer]

yes we stayed with the t1 flywheel to allow us to change gearboxes

I have never had a t1 and t2 box apart at the same time so am unsure if parts are interchangable

where does the t2 flywheel/clutch touch on a t1 g/box?

[James]

pretty much everywhere I think. The flywheel is a bigger diameter. So all along the back edge by the starter motor. I might just try and score an EN flywheel, get it lightened, put new timing marks on it, and sort out an aftermarket clutch.

Although, I would imagine that the innards of T1 and T2 boxes should be interchangable, they have the same final drive and ratios dont they? Be handy if I could drop in an EN crown and pinion. Cause I can get aftermarket clutch plates easy cause they are the same as 84-87 Si civics

[John_S.]

Interesting, I was under the impression that you could modify Quaife LSD from the 84-87 to fit the earlier boxes.
BTW, are we still on for the Turbo camcover?
Did you recieve the Email I sent you a while back regarding the camcover gaskets?

[James]

Yup still on, I sent you an email today ;D

What gave you the impression that you could modify the 84-7 diffs?, or rather who gave you that impression.

[John_S.]

I don't remember where I heard it, but I know I heard it from more than one source. Maybe Don over on the 1stGen site can comfirm or reject the idea. All I know is having a "minimal" 85 HP EB-3 stroker for 10+ years on the road I was never able to launch it full power in 1st gear there was so much axle hop...we need torsens if we are going to have any real acceleration. If I could afford it I'd back a run of a dozen just to get them built... ;Dlike the saying goes "if you build it, they will come". There is no doubt in my mind there exists a market for at least that many. Hell one could probably sell them on eBay and have guys tripping all over each other.  Big holdback is potential warrantee problems though. :-/

[James]

Has anyone made progress with the EL conversion ?

You are kidding yourselves if you think you can get the power to the ground with an standard 'open' diff.

I have the 'Quaife' type Torsen LSD diffs.
They would be ideal for an EL conversion.
I run one in my rally car with NO problems.

Am looking at getting another batch made.

Is anyone intertested in a LSD ??

Thats a quote from Mark_moddy

http://www.cityturbo.com/cgi-bin/yabb/YaBB.cgi?board=GEN;action=display;num=1100296130;start=30


I think his rally car is a second gen 1300 from memory.
Seems he has had a few built over the years, might be worth it to try and get hold of him, considering he must have someone who knows what they are doing when it comes to making one for an old honda.

[John_S.]

Bigelboe,
I can't find the Email you sent me. what address did you use ???

[James]

I just hit reply to the one you sent me. says the addy is johnna_2002 at yahoo dot com

[John_S.]

Well crap,
I get spammed a lot, maybe I deleted it by mistake. ::)

[Mark_Moddy]

The old rally car is an 1975 Series 1 Civic.
Running a stroked EB motor on twin 35mm Dellortoes, etc etc.

The Quaife type LSD works really well.

Another batch of diffs should be available before Xmas (hopefully).

When using an EN 5 speed box on a T1 ot T2 you have to use the EB flywheel and starter motor.