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[Jayray]

And please keep sending me you thoughts and ideas please as over here they do like to do things by the book and belief  that's the only way you can do it , when I said to a Bulgarian mechanic about changing my diff for a different ratio one  here just looked gone out at me and after ten seconds just said crazy man and walked away .

[Kevin Wood]

The way to think about it is that changing to a 3.7 diff from a 3.45 will raise the RPM by 7.2% in every gear.

So, at a speed where you're cruising at 3,000 RPM, you'll now be doing 3220 RPM. It's about half of the difference between cruising in 4th and 5th gears.

If that seems acceptable, then it may be a way forward. Do check that your engine doesn't have a problem affecting performance first, though.

[Doctor Gollum]

2.0 DTi isn't exactly blessed with power though

[Jayray]

Will try and clean inlet manifold tomorrow and other bits  . .

[Jayray]

No not alot of power  but ones you get up to speed it's a great car

[Jayray]

Ok another question , what ratios on the diff do the differed engines have , just so I know which one I should go for as the list I got of the internet I thing is wrong . Thanks

[zirk]

Ok another question , what ratios on the diff do the differed engines have , just so I know which one I should go for as the list I got of the internet I thing is wrong . Thanks

3.45, 3.7, 3.9, 4.22.

Ive already said which one I believe yours is and which one you should try and fit, assuming you can find one.

[Jayray]

I've just noticed I am running on 16" wheels which the car came with and on the spec it says 15"  how much will this impact on the performance. Sorry yes I should have noticed this before .

But it shows that I'm leaning from you guys ..

[Jayray]

Ok another question , what ratios on the diff do the differed engines have , just so I know which one I should go for as the list I got of the internet I thing is wrong . Thanks

3.45, 3.7, 3.9, 4.22.

Ive already said which one I believe yours is and which one you should try and fit, assuming you can find one.

Thanks for reminding me 

[Jayray]

Final drive is 3.45   

[Jayray]

This http://www.omegaowners.com/forum/index.php?topic=90453.0

and This http://www.omegaowners.com/forum/index.php?topic=90497.0

might be useful, although that reflects later models sold into the UK market.

I believe the diff is the same between saloon and estate models, however, so that should widen your search a little. Manual 3.0 V6 cars had the 3.7 diff ratio, but I would imagine yours is likely to be the 3.45 which was exclusive to the diesel cars.

I understand the charts now, they make it alot Easyer to understand what the differed ratios change. Brilliant thanks

[Jayray]

Here's a chart with all the omega differential ratios on it and what engine they all are on just click on the link

http://www.opel-infos.de/getriebe/ha_diff.html


But on here it say that mine is a 3.7 so now I'm really confused or am i missing something

[Jayray]

This http://www.omegaowners.com/forum/index.php?topic=90453.0

and This http://www.omegaowners.com/forum/index.php?topic=90497.0

might be useful, although that reflects later models sold into the UK market.

I believe the diff is the same between saloon and estate models, however, so that should widen your search a little. Manual 3.0 V6 cars had the 3.7 diff ratio, but I would imagine yours is likely to be the 3.45 which was exclusive to the diesel cars.

Thanks for the charts I understand them now and they make it alot Easyer. I've put a link on page two which shows all the diff ratios and what engine code ect it mite be useful for some one else one day . But it says mines a 3.7 but on the specs for my car on the internet  it say final drive ratio is 3.45 for my car I don't under stand which one is my ratio of my diff can you help on this one please 

[zirk]

I give up. 

[Andy H]

Here's a chart with all the omega differential ratios on it and what engine they all are on just click on the link

http://www.opel-infos.de/getriebe/ha_diff.html


But on here it say that mine is a 3.7 so now I'm really confused or am i missing something

That page very clearly states "OmegaB X20DTH" 37:10 = 3.70

The 2 litre diesel will have slightly less torque than the 2.2 diesel so it makes perfect sense for the differential to have a slightly shorter gearing.

What does "ohne sperre" and "mit sperre" mean?

Edit "ohne sperre" and "mit sperre"  mean without/with limited slip differential.
I cannot see any reference to manual or automatic gearbox in that table (which puzzles me)