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Different Diff Types Explained 

 

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Posted: Mon Jan 16, 2006 11:37 pm 
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[quote="LG"]

This is very useful LG!

I've got a STD EF, with what I can only guess is a 3.23:1 Single spinner.

With all the mods I've done (everything but the cam, see below list), would my car benefit from going to a 3.45:1 or 3.7:1 LSD?

I can feel that my engine has opened up more with my intake & exhaust mods, but the car itself is still a little sluggish (except when I put my foot down with Auto shift kit switched on!)

A higher geared diff would HAVE to make the car more responsive, right?

 

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Posted: Sat Jan 28, 2006 12:57 am 
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no higher gearing makes it less responsive, a higher value for the diff means shorter gearing. shorter gearing is more responsive, faster accelerating but uses more fuel because there is more revs for a given speed
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Posted: Sun Jan 29, 2006 6:33 pm 
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veeate wrote:
id be p****d if it doesnt have an LSD...it should do....go sit on the brake and see if it leaves 2 nice fat strips.........as for the ratio, jack the car up and see what the tag on the diff has stamped on it....im gonna take a guess and say 3.45....could be wrwong but....what revs does it sit on at 100 kays??


That test is actually NOT a useful indication of whether the diff is limited slip or not - on a good surface where traction on both wheels is fairly even a standard diff will leave two nice big black marks as well!!!

There is a big MISCONCEPTION that standard or "open wheel" diffs only drive one wheel - in fact even an open wheel diff drives BOTH wheels, but the result when the traction on one side is less than the other is that side will spin more and the side with good traction will lose driving force.

A more useful test would be to start off with one wheel on the bitumen and the other on the dirt and see how the car takes off with firm but not mad acceleration - if it's very difficult to control wheelspin on the wheel which is off the bitumen then it's probably a std diff (or sick / badly adjusted LSD) - but if it's possible to get rolling without too much difficulty controlling that wheelspin then there's a good chance she's LSD.

 

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Posted: Mon Jan 30, 2006 3:04 am 
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Here's an easy way to test if you have and lsd or not without doin burnouts or other s*$t that can hurt you'r diff:
Jack the back end up after schocking the front wheels.
Make sure the car is in neutral and the handbrake released.
Spin one of the rear wheels with your hand.
If the other rear wheel turns in the same direction as the one you are turning you have lsd.
If the other rear wheel turns in the opposite direction, then you have a conventional.

 

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Posted: Mon Jan 30, 2006 9:15 am 
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kinkezza's absolutely right there - I have to make it clear tho that I wasn't talking about being brutal (perhaps using the term "moderate" is even over the top for what I was trying to suggest) - ie. if the wheel starts spinning there's no point continuing to lay into it - and you'll find that with a std diff the off road wheel will slip quite easily with just mild acceleration. The difference between that wheel off the road wanting to slip really easily whilst the car makes little forward progress vs the car moving off with decent traction will be quite noticeable.

 

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Posted: Mon Feb 06, 2006 11:44 pm 
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quick question. i have a 3.45 s/s diff. whats it gonna cost me to get it 3.45 lsd?

 

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Posted: Tue Feb 07, 2006 9:15 pm 
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janek wrote:
quick question. i have a 3.45 s/s diff. whats it gonna cost me to get it 3.45 lsd?


The cost of a hemisphere when you find one
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Posted: Tue Feb 07, 2006 11:38 pm 
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which would be roughly how much?

 

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Posted: Wed Feb 08, 2006 9:07 am 
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janek wrote:
which would be roughly how much?


i think LSD hemisphere is what guys round the 300-350 mark

 

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Posted: Wed Feb 08, 2006 10:14 am 
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yer about that
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Posted: Sat Feb 18, 2006 11:59 pm 
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another quick question.. I have the stock 3.23 limited slip in my ghia, i seem to have quite a bit of "backlash" i think they call it ahh i cant remember but anyway the diff's done a few k's now, way over 230 000 and there is a knocking noise at certain speeds when slowing down from the rear somewhere. Just wondering what would i be looking at spending if i wanted to upgrade it to a 3.45 and would there be any real diffrence.

Also can i just get a 3.45 centre and have it fitted in my 3.23?

 

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Posted: Wed Mar 01, 2006 3:18 pm 
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i have a mustang with what they call a 8 & 3/4 inch diff

please clarify what it is!
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Posted: Wed Mar 01, 2006 3:18 pm 
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i have a mustang with what they call a 8 & 3/4 inch diff

please clarify what it is!
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Posted: Wed Mar 01, 2006 3:18 pm 
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i have a mustang with what they call a 8 & 3/4 inch diff

please clarify what it is!
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Posted: Wed Mar 01, 2006 6:28 pm 
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Not as strong as a 9 inch :roll:

 

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