What diff ratio for EK?

stafkel · Post by **stafkel** » Sun Jul 15, 2007 9:35 pm

Hi
This is my first post I have just dropped a warm grey into my EK sedan and was after advise on what would be a good replacement diff for her.
In brief the following as been done to the motor
mill head and block
regrind crank shaft -010''-010"
regrind cam to 25/65
rebore block fit 3.125" pistons
186/202 inlet valves +.005
186/202 exhaust valves +.005
alloy timing gear
fly wheel grind and balanced
5 speed celica box
extractors
twin strombergs
I could go on but it was a sump to rocker cover rebuild, one chao suggested a 3.08 replacement.
Any advise will be much appreciated.
Still thawing out from the Wagga Waggga swap meet today.

Thommo · Post by **Thommo** » Sun Jul 15, 2007 9:45 pm

Gday Stafkel
Welcome to the forum.
My suggestion would be to leave the original grey motor diff gears.
It would give good acceleration through the gears,
& the celica 5th gear would drop the revs a bit for highway cruising.
Any chance of posting some pics of your ride,
We enjoy seeing what members are doing.
Cheers
Jeff

Devilrod · Post by **Devilrod** » Mon Jul 16, 2007 12:39 pm

What Thommo said. Try it out first with the 3:89's and if you're not happy and want the revs to drop a little more on the open road maybe 3:55's.

thropzed · Post by **thropzed** » Mon Jul 16, 2007 1:35 pm

Hey Devilrod, I run 3.55's behind my 5 speed with 186 power and find I'm changing gears to often around town but on the highway I get 65mph at 2700 revs which does my fuel consumption the world of good. Don't know what the happy comprimise would be "go to bigger or smaller gears" at the moment it works for me.
Cheers Theo Z...........

Devilrod · Post by **Devilrod** » Mon Jul 16, 2007 5:09 pm

Sounds like you could go taller gears Theo! Are you running 13's?

Currently I run a trimatic with 3:36 and 14" tyres, I have no tach so am unsure of revs. I guess what I'm saying is you need to find a setup you are happy with. I plan on a 4 speed auto eventually and final diff gear choice is still up in the air.

mrs ratbox · Post by **mrs ratbox** » Mon Jul 16, 2007 8:19 pm

may be better for them to start with a 3.55 so if they need to change ratios they have the correct rear uni's

stafkel · Post by **stafkel** » Thu Jul 19, 2007 9:39 am

Thanks for the advise and I'll post same pics of my ride as soon as I get back home