diff help

ea007 · 14-07-2005, 05:25 PM

after some diff info i have a 75 model 2 door mk11 it has a removable center was wondering if this was a standard diff in the 1600. it is 3.93 ratio can you get a 3.25 or similar ratio to fit. any help would be appreciated.

The MaDDeSTMaN · 14-07-2005, 11:07 PM

As far as I am aware, the tallest ratio you can get is a 3.54:1, not sure why you'd want a ratio any taller then that...

ea007 · 15-07-2005, 02:15 PM

country driving all of its life so want good legs over acceleration. plus are they removable centre or integral
mine has been modded and i am unsure if it is standard

Paul735 · 15-07-2005, 06:37 PM

It doesnt work like that if you put in too tall a diff the engine works very hard and you use LOTS more fuel, ask anyone that has put big tyres on a 4x4 less rpm but more fuel overall.

The MaDDeSTMaN · 15-07-2005, 06:58 PM

Quote:

Originally Posted by 75eski2L

country driving all of its life so want good legs over acceleration. plus are they removable centre or integral
mine has been modded and i am unsure if it is standard

yeah, it looks like it has been modded, unless it's an imported RS2000, either it's had the RS2000 front end grafted onto a 'normal' Escort, or it's a later year then '75...

If its a '75 Escort, and not an imported RS, then it also wouldn't have originally had a 2000cc "Pinto" OHC engine, it would have had either a 1300cc or 1600cc "Kent" pushrod OHV engine.

What does it say on the compliance plates, just the model #, engine and trans codes?

I say that because I know my Escort was originally an XL 1600, but now it's got GL badges, a Ghia interior and instrument cluster and a 2000cc pinto under the hood...

The MaDDeSTMaN · 15-07-2005, 07:07 PM

Quote:

Originally Posted by Paul735

It doesnt work like that if you put in too tall a diff the engine works very hard and you use LOTS more fuel, ask anyone that has put big tyres on a 4x4 less rpm but more fuel overall.

exactly, unless you're spending 95% of your time cruising at 140km/h or higher, and holding the speed steady, you would regret going for a taller diff then a 3.54:1. 3.54:1 diff would give you about 3000rpm at 100km/h, whereas 3.77:1 diff (same as what I've got in mine) gives about 3200rpm at 100km/h. Much taller then a 3.54:1 diff ratio and you'll be needing to go back to third gear to overtake at 100km/h, in which case you'd be using more fuel then simply leaving it in 4th and putting the foot down a little.

Quote:

Originally Posted by 75eski2L

plus are they removable centre or integral

Not sure, I can look it up, I'll have a look and get back to you.

The MaDDeSTMaN · 15-07-2005, 07:14 PM

Oh yeah, you'd probably benefit much more from slotting a 5 speed box behind it then changing the diff ratio. Personally, I'd go for a sierra 5 speed box, pretty easy to fit and same ratios in 1st to 4th, but with an overdrive for 5th.

I think you'd be more then happy if you swapped the 4 speed for a 5 speed

ea007 · 16-07-2005, 10:41 AM

ok thanks for the help. it does i found the engineer cert for all the mods. used to be a 1600 had a rs2000 front and a group 3 flare kit of rallicross(genuine ford), it has 14 inch wheels so i will try 3.54 first. 10 point rollcage and no back seat

T3man · 18-07-2005, 08:16 PM

Capris have a 3.22 diff - much bigger ring gear than Escorts but I think the centre distances on the spring eye bolts are the same, so if you found one you could bolt it in drum to drum ... still, I reckon you're better off with a five speed.

ea007 · 23-07-2005, 09:40 AM

thanks for the input had someone suggest fitting a mx5 motor and 5 speed box leaving the current 3.93 diff as the mx5 put out about 75kw from a lighter lower capacity engine. any thoughts ????

The MaDDeSTMaN · 23-07-2005, 11:53 AM

Quote:

Originally Posted by 75eski2L

thanks for the input had someone suggest fitting a mx5 motor and 5 speed box leaving the current 3.93 diff as the mx5 put out about 75kw from a lighter lower capacity engine. any thoughts ????

Sounds very interesting to me...