Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: mrjimbo on 02 December 2010, 11:50:17

Title: Diff ratio
Post by: mrjimbo on 02 December 2010, 11:50:17

What diff ratio's were fitted to the Omega ?

Title: Re: Diff ratio
Post by: Kevin Wood on 02 December 2010, 12:19:10

Here you go...

http://www.omegaowners.com/forum/YaBB.pl?num=1163895469/0#0

3.7, 3.9 and 4.22 on the petrol models and 3.45 on the DTI.

Kevin

Title: Re: Diff ratio
Post by: mrjimbo on 02 December 2010, 12:37:57

So would that be 3.90 on a 3.0V6 Auto Estate ?

It only has 2.5/2.6 and 3.2 listed  ;)

Title: Re: Diff ratio
Post by: Kevin Wood on 02 December 2010, 14:11:51

Quote

So would that be 3.90 on a 3.0V6 Auto Estate ?

It only has 2.5/2.6 and 3.2 listed  ;)

I believe so. On the 3.0 they were 3.90 on the autos and 3.70 on the manuals I believe.

A V6 Auto with a 3.9 is doing about 80MPH indicated at 3,000 RPM in top. :y

Kevin

Title: Re: Diff ratio
Post by: mrjimbo on 02 December 2010, 14:17:26

OK, i'll have a look see what the rev counter is saying at 80mph later, on the private road of course  ;)

75mph on the motorway yesterday it was doing about 2800rpm so it looks like it is a 3.90  :y

I will report back later

Title: Re: Diff ratio
Post by: mrjimbo on 02 December 2010, 17:01:07

3000rpm is 80mph  :y

Thanks Kevin

Title: Re: Diff ratio
Post by: 2woody on 03 December 2010, 21:06:53

....... work it out exactly.

mph per 1000 revs = 60,000 divided by ( diff ratio x top gear ratio x wheel revs per mile )

wheel revs per mile should be 817.
doing it it 4th gear removes the top gear figure from the equation as it's 1:1 ratio.