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Different Diff Types Explained
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EL XR8
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PostPosted: Wed Jul 13, 2005 7:14 pm    Post subject: Reply with quote

Hey Smoke_Rubber.

My Manual EL, has 3.45's. It sits on about 2,100 at 110km/h. Its dead on 2 grand at 100km/h.

I don't know whether it would matter cause its an 8???
Can only get around 100km/h out of it in 2nd.

Dave
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-clampy-
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PostPosted: Wed Jul 13, 2005 8:14 pm    Post subject: Reply with quote

^ thats the same as i get from my manual EB v8 with a 3.27. and it also redlines at 100kmh in second.

in 5th: 2000 at 100, 2200 at 110.

in 4th: 2000 at 80kmh

in 3rd: 2000 at 60kmh

in 2nd: 2000 at 40kmh
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veeate
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PostPosted: Thu Jul 14, 2005 10:24 am    Post subject: Reply with quote

Beefcake wrote:
i dont no the diff ration wer can i find it out
The ratio should be stamped on the Crown....thats the big gear that the hemisphere bolts on to...
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DjeMz
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PostPosted: Thu Sep 29, 2005 6:39 pm    Post subject: Reply with quote

so wat type or diff duz my au v8 fairlane have??


LSD?
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veeate
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PostPosted: Thu Sep 29, 2005 6:45 pm    Post subject: Reply with quote

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??
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DjeMz
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PostPosted: Tue Nov 15, 2005 11:51 am    Post subject: Reply with quote

ill have a look tonight... i cant jack up the car, but i will see wat it sits on.
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Mr.Kiss
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PostPosted: Wed Nov 16, 2005 3:43 pm    Post subject: Reply with quote

My car car is a EF auto and at a 100KM it sits at 1700rpm. any idea what diff ratio? 3.08 or 3.23??
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Mr.Kiss
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PostPosted: Wed Nov 16, 2005 4:15 pm    Post subject: Reply with quote

Doesnt matter i just found the sticker on the drivers side of the axel, 3.23 single spinner!!!
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Tomek
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PostPosted: Wed Nov 16, 2005 4:36 pm    Post subject: Reply with quote

EDIT didnt notice this goes from a year back lol

But anywho... pretty informative this is, i thought there was only 3 diffs (single spinner, LSD and mini spool)
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NIGHTHAWK
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PostPosted: Thu Nov 24, 2005 7:48 am    Post subject: Reply with quote

Without pulling the diff apart how can you tell what you have got.? I do know that both wheels turn at the same time on my xf s pak. I have even been able to make the wheels spin (noise) in 3rd gear, however its annoying and cornering is terrible. I dont know why someone would put this type of diff centre in it.My other question is can the centre be changed without removing the axle.
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markr154
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PostPosted: Mon Jan 16, 2006 10:37 pm    Post subject: Reply with quote

[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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Blu Falc
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PostPosted: Fri Jan 27, 2006 11:57 pm    Post subject: Reply with quote

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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Greenmachine
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PostPosted: Sun Jan 29, 2006 5:33 pm    Post subject: Reply with quote

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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Kingkezza
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PostPosted: Mon Jan 30, 2006 2:04 am    Post subject: Reply with quote

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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Greenmachine
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PostPosted: Mon Jan 30, 2006 8:15 am    Post subject: Reply with quote

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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janek
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PostPosted: Mon Feb 06, 2006 10:44 pm    Post subject: Reply with quote

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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Blu Falc
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PostPosted: Tue Feb 07, 2006 8:15 pm    Post subject: Reply with quote

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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janek
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PostPosted: Tue Feb 07, 2006 10:38 pm    Post subject: Reply with quote

which would be roughly how much?
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Big Kev
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PostPosted: Wed Feb 08, 2006 8:07 am    Post subject: Reply with quote

janek wrote:
which would be roughly how much?


i think LSD hemisphere is what guys round the 300-350 mark
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Blu Falc
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PostPosted: Wed Feb 08, 2006 9:14 am    Post subject: Reply with quote

yer about that
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