that looks great, definately a future mod for me Looks like a relativly simple job, definately the easiest diff upgrade i've seen, nice work!!
Do you know what models to look out for to get an LSD centre, or are they extremely rare? What ratio is the diff?

Hmm sounds good.. i'll have to do some reserch into what centers came out of what, but the 3.8:1 is probably the go..

why are you going so low in the gear ratio??? Wont a 4.31:1 make 1st useless and end up being slower with an extra gear change??
I have a 3.08 and just got a 3.27 which will be a little better but i dont want to go much lower than that. I will have to try both up the strip i guess to see for my self.
I have a 5 speed also but i guess i do want to keep my crusing ecconomy and top end. with a 3.27 its about 2400rpm at 100kmh and top of 240kmh @ 5800rpm

Ok did a few quick checks, the centre in the housing is roughly 4.3, and my spare i dug out is 3.3, now the standard diff in 1100's and 1300's is about 3.9something, and the GT and autos are 4.12something.

Now what i need to know is this, if i was to go to 3.3(dont realy want to cause of chipped teeth on pinion) would me bottom end be to far gone, as most of you dont know im running a turbo 2.3 pinto, now i dont wanna go too low as that will create excess lag we dont need.

But if i got to the 4.3 will that be too low, since the 4 speed GT's and 3 speed eskys came with 4.12(say 4.11) i will only be going .2 different, will this make such a difference now that in adding an overdrive to the car?????

Now i cant see me trying to do 250kmh, but id like to see it do 200, i dont mind if at 200 its reving at 8500rpm, that not a problem.

Feedback is good guys keep it coming, as i have to get the MK2 brakes before i can go on, so i have some time to look for a LSD for it!

I think this is Marks spred sheet. Very handy.
The RPM out of the boxes is what i have worked out it to be when the next gear is selected, just to make sure its in the sweet spot for the next gear.[%]


Download Attachment: w57-3.27FinalDrive.xls
16.86 KB

Download Attachment: w57-2.77FinalDrive.xls
16.86 KB

I have run 4.11 and 3.89 ratio's on the track and strip.The 3.89 is definately better suited in my car for both.I am even strongly considering 3.77 now.I think the general rule of thumb should be,the lower down in the rev range the tourque comes in,the lower(numerically)the diff ratio should be

quote:

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Originally posted by darnoldrs
[br]Phil, How do the 28 spline axels hold up?? i have twisted a set of 25s and i dont even have much power at the moment.

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The un shortened axles in 28 spline are bullet proof so far,no twist at all.The shortened axles twist at the spline going into the side gear.I have broken one so far.I wouldnt be to concerned with the twists.It took me 2 years to break my first one,and that was twisted for ages before it let go.