Idiots guide to diff identification!

[haircutmike]

Yep, that's what I need, not "what I can give"!

Tried drag racing at Odiham yesterday with reasonable results, 1/4 mile, 12.65 seconds.

Comparing top end speeds in different gears with another tivver, I may have a higher ratio diff.

If so, I would like to change it, more for T/D's, as I have always thought it was long legged!

Simple question, how do I determin what I have?

[rigga]

Well if your not actually talking types,ie GKN, but diff ratios,i thought unless it was stamped on the outside its a case of opening it up and counting the pinion and crownwheel teeth ?

[biper]

Mark the prop with some tipex then mark a rear wheel.
Turn the wheel 3 times and count how many times the prop turns. 3(w)...5.4(p) Or is it the other way round.

Edited by biper on Wednesday 27th April 07:48

[dbv8]

Thats a good idea Barrie
I think you are confused with your numbers tho.

Peter, if its a standard 3.45:1 then as Barrie says jacking the rear up and turning a wheel should tell you. The prop should turn 3.45 times for 1 turn of the wheel. Best to turn the wheel 10 times and have someone count the prop. If its 34 1/5 then standard. You may only get shy of 31 turns which means you have a 3.08:1

[haircutmike]

Nice one Derek, under the car for me tonight then!

[dbv8]

I caught Barrie telling some Porker owner about some numpty cooking your clutch last night.

I hope its ok. Itshould be as it ran a decent 12.9 immediately after the disputable incident.

The car did smell quite a bit but i thought you had been heavy on the brakes on previous runs???
If not then the clutch is definately slipping with the torque you have and the grip from the R888s.
Try giving John Eales a ring. I run his single plate kit, good for 500lb/ft. About £300 IIRC+ I paid a local garage £200 to fit it.

[biper]

Morning Derek
Hope you enjoyed last nights meet. The burgers were yummy and a bargain at £3. Some interesting motors there as well.

[dbv8]

biper said:

Morning Derek
Hope you enjoyed last nights meet. The burgers were yummy and a bargain at £3. Some interesting motors there as well.

Yes Barrie, i thought it was ....

[biper]

You going to post up any of the vids you took at Odiham.

[dbv8]

biper said:

You going to post up any of the vids you took at Odiham.

I havent got the cable i need with me.
Will sort it Friday night after a day in the garage.

[biper]

Thanks
I see we are both hard at work at the moment.

[dbv8]

biper said:

Thanks
I see we are both hard at work at the moment.

Must get back to designing this Aircraft Carrier

[haircutmike]

OK, my wife was impressed by being pulled away from the final of Master Chef to turn the wheel!

10 turns of the wheel = a tad over 18.5 turns of the prop???

Doh! What does that mean?

[dbv8]

At the moment confusing. Did you have both wheels off the ground?

[haircutmike]

Nope, just the one, all marked with chalk etc.

[haircutmike]

Just checked again.

One turn of the road wheel = approx 1.7 ish of the prop.

Ah, does that mean the one wheel is spinning the prop at half speed and therefor,
10:18.5 = 10:37 = 3.7:1, Bingo!



So what does that mean?

[dbv8]

You need both wheels free, LSD magic otherwise

[haircutmike]

Will do again tomorrow, up at 5.30 in the morning .

[haircutmike]

Right, using the new, correct method;

10 X wheel rotation : 33 prop rotations = 33:1

What does that mean?

[Harrytsg]

Did you have the tyre valves opposed, otherwise your readings will be wrong?