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Sierra 3.62 pumped lsd Diff
Minicooper - 23/6/11 at 02:39 PM

Hello,
What is a fair price to ask for a sierra 3.62 pumped up lsd diff by phil jones?? whoever he is. I know it's worth what someone will pay and all that. Zero miles since conversion

Cheers
David

omega0684 - 23/6/11 at 02:56 PM

"pumped up"?

Minicooper - 23/6/11 at 02:58 PM

That's how the previous owner referred to it, it's basically uses thicker viscous fluid in the lsd unit for a tighter diff

Cheers
David

[Edited on 23/6/11 by Minicooper]

MikeFellows - 23/6/11 at 05:07 PM

im confused

its a 3.62 lsd that phil jones put some thicker oil in?

edit:

well ive googled and I see other people selling pumped diffs but I'm still no closer to finding out what it is

[Edited on 23/6/11 by MikeFellows]

Minicooper - 23/6/11 at 05:23 PM

As standard the sierra lsd is loose compared to plate diffs and the like, so an upgrade is to remove the standard fluid and put in a thicker more viscous fluid therefore tightening the diff. The differential casing oil stays the same it's the internal fluid in the viscous diff that is upgraded

In the ford world it is a fairly well know upgrade path for the lsd.

I'm off out soon but will find an article descriping the upgrade in detail, it is a complete strip and rebuild to do this work

Cheers
David

Liam - 23/6/11 at 05:43 PM

Aye - a friend of my dad's had a competition escort cossie, and when set up for tarmac both the centre and rear diffs were set up so tight with different spec fluid that when pushing the car by hand, you only had to put a tiny amount of steering lock on for the diffs to lock up so much you couldn't move it!

fesycresy - 23/6/11 at 06:27 PM

Easy answer, ring Phil at Road and Race Transmissions - 01959 525105.

Having never heard of 'pumped' diffs, I can't comment, but the standard viscous is designed for a heavy 4x4, if anything the diff needs to be de-rated.

Minicooper - 2/7/11 at 10:16 AM

Found this while looking for Tigra gearbox options, about half way down the page you will see a pump up service for the Sierra viscous lsd diff at £230

http://www.pjed.co.uk/engine_development_differentials.htm

They strip it down completely renew seals, empty viscous unit, refill viscous unit with a slightly thicker fluid and then totally rebuild set backlash, etc refill diff with oil.

The fluid that use in the viscous lsd is only slightly thicker than the standard ford fluid and therefore still absolutely suitable for road use, anyway it's now going in the fro sale section

Cheers
David

Neville Jones - 3/7/11 at 09:40 AM

quote:
Originally posted by fesycresy

Having never heard of 'pumped' diffs, I can't comment, but the standard viscous is designed for a heavy 4x4, if anything the diff needs to be de-rated.


I'd second that opinion all the way.

I'm presently dealing with a customer car which has a standard Sierra viscous lsd. Trying to dial out push into corners and power on oversteer out is extremely difficult, as the diff is as good as locked, with the little weight on the rear wheels to make the viscous diff slip.

When put into a lightweight 7 type car, these Sierra viscous diffs need softening up by quite a bit.

Oh for an original genuine Gleeson Torsen! (And definitely NOT a quaiffe!)

All in my very humble opinion, of course.

Cheers,
Nev.

mad-butcher - 3/7/11 at 06:39 PM

working on what's been said: bike engine car, no reverse, pumped up diff could be fun pushing it backwards. in fact thinking about it the engine would really love it going forwards.

tony

ajw - 8/7/11 at 04:56 PM

have 3.9 pumped diff by phil jones in Indy r ,works a dream. Plate diffs very severe unless u want to do a smoking drift through the hairpins. Have 280 bhp on race michelin slicks