6 speed gear ratios

[sdio]

I would like to know that is the gearing on a k-series with 6 speed box and 185x60 tires.
I am quite sure my speedo reads nonsense and cannot tell how fast i am going with every gear.
Thanks

[F355GTS]

do you know which differential you have?

[sdio]

No i do not I am affraid...
All i know is that it has an lsd. It seems that with 6th gear and 4500 the car is doing about 70.
Is that possible ?

[F355GTS]

sdio said:

No i do not I am affraid...
All i know is that it has an lsd. It seems that with 6th gear and 4500 the car is doing about 70.
Is that possible ?

For your wheel size in 6th and 4.5k it would be 75mph with a 3.92 diff, 81.5mph with a 3.62

[F355GTS]

F355GTS said:

sdio said:

No i do not I am affraid...
All i know is that it has an lsd. It seems that with 6th gear and 4500 the car is doing about 70.
Is that possible ?

For your wheel size in 6th and 4.5k it would be 75mph with a 3.92 diff, 81.5mph with a 3.62

I was going to add that probably one of the best ways to check accuracy is using a tom tom or similar with a GPS readout

[CanAm]

That does sound low. What is wheel your wheel diameter?
On 185/60/14 and the 3.92 diff mine works out at 17.1mph/1000rpm in sixth, or approx 4100rpm at 70mph.

[bcr5784]

F355GTS said:

I was going to add that probably one of the best ways to check accuracy is using a tom tom or similar with a GPS readout

+1 and if you don't have one to hand, there are any number of speedo apps for android (and I assume) apple phones.

[sdio]

I am on 13 inch 185 all round.

[sdio]

F355GTS said:

For your wheel size in 6th and 4.5k it would bie 75mph with a 3.92 diff, 81.5mph with a 3.62

If this is the case,
Do you know what speed i get from each gear at 1000rpm or any other rpm?
Thank you

[Aeroscreens]

You need to download a free program called Gearcalc.

Here you can enter tyre sizes, diff ratios and gears and get all the info you need

[sdio]

Thanks that is great

Edited by sdio on Wednesday 14th December 06:51

Edited by sdio on Wednesday 14th December 06:52

[CanAm]

sdio said:

F355GTS said:

For your wheel size in 6th and 4.5k it would bie 75mph with a 3.92 diff, 81.5mph with a 3.62

If this is the case,
Do you know what speed i get from each gear at 1000rpm or any other rpm?
Thank you

I think F355GTS was basing his figures on the more usual 14" wheels rather than the 13" you have now stated.

[allen l]

Have you checked the rear of your speedo? Mine has a switch I set when I changed from 14 to 13 inch wheels.

[sdio]

Gear calc is great and i think answers all 😊