Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: wilvo on 24 October 2009, 16:48:55

Title: Diff keep or change?
Post by: wilvo on 24 October 2009, 16:48:55: Hi i have a 99 face lift 2.5 manual cdx estate but am also breaking a 2000 3.0 elite saloon would to diff off the elite be better than mine on the 2.5?
Title: Re: Diff keep or change?
Post by: tunnie on 24 October 2009, 17:19:06: you don't mention if the 3.0 is an auto or manual? yes they will switch over fine, but Autos have longer ratios
Title: Re: Diff keep or change?
Post by: wilvo on 25 October 2009, 09:35:59: The 3 litre is an auto, so better i keep 2.5 as im after more acceleration- what are chances that 3 litre has lsd?
Title: Re: Diff keep or change?
Post by: Andy B on 25 October 2009, 09:37:41: Quote
..... what are chances that 3 litre has lsd?

Very slim to no chance. ;) ;) ;) :y
Possibility if it was a white car with holes in the roof. ;)
Title: Re: Diff keep or change?
Post by: Elite Pete on 25 October 2009, 09:38:41: Quote
The 3 litre is an auto, so better i keep 2.5 as im after more acceleration- what are chances that 3 litre has lsd?
Virtually none, it was mainly the x police manual 3.0 which had the LSD.
Title: Re: Diff keep or change?
Post by: wilvo on 25 October 2009, 09:42:36: o well can hope i suppose so what is best for accelleration? 2.5-3.0?
Title: Re: Diff keep or change?
Post by: tunnie on 25 October 2009, 10:31:45: Quote
o well can hope i suppose so what is best for accelleration? 2.5-3.0?

do i really need to answer that? :-?
Title: Re: Diff keep or change?
Post by: jonathanh on 25 October 2009, 11:14:01: the answer depends

If your question is which car is quicker for acceleration then a 3.0 auto is marginally quicker than 2.5 manual.

If your question is which diff, fitted to your 2.5 manual will give quicker acceleration, the answer is the one fitted! (I think)
Title: Re: Diff keep or change?
Post by: wilvo on 25 October 2009, 18:14:35: no i know 3.0 will be quicker im just wondering if the ratio on 3.0 auto will give better accelleration than my 2.5 manual...
Title: Re: Diff keep or change?
Post by: tunnie on 25 October 2009, 18:17:19: Quote
no i know 3.0 will be quicker im just wondering if the ratio on 3.0 auto will give better accelleration than my 2.5 manual...

Longer ratios of autos will hamper 0-60, but if you get a x-plod diff that would help.

Police autos have a shorter first ratio which aides 0-60, but you loose top end speed.
Title: Re: Diff keep or change?
Post by: Elite Pete on 25 October 2009, 20:48:57: Stick a set of 15" wheels and low profile tyres on it ;)
Title: Re: Diff keep or change?
Post by: Ian_D on 26 October 2009, 00:01:16: Quote
Stick a set of 15" wheels and low profile tyres on it ;)
;D

Will the ratios be the same in both the 2.5 auto and 3.0 auto? ::) (starting to break a 2.5 v6 estate thats all! ;))
Title: Re: Diff keep or change?
Post by: Diamond Black Geezer on 26 October 2009, 00:42:39: Quote
Stick a set of 15" wheels and low profile tyres on it ;)

The man raises a fair point :y Smaller wheels are a very headache-free way of improving accelleration.
Title: Re: Diff keep or change?
Post by: Matchless on 26 October 2009, 12:50:22: Can someone with access to TIS post up the V6 diff ratios please?

Tunnie, you have it the wron way around; a 2.5 manual fitted with a 2.5 auto diff goes like a rocket because the auto diff is lower geared (4.22:1 compared with 3.9:1 for the manual). Fuel consumption is higher though.

I cant remember the 3.0 ratios, I think the manual is 3.7 but dont know the auto.
Title: Re: Diff keep or change?
Post by: Mr Skrunts on 26 October 2009, 13:01:40: Quote
Quote
o well can hope i suppose so what is best for accelleration? 2.5-3.0?

do i really need to answer that? :-?

valid question.

2.5 manual V 3.0 Auto
Title: Re: Diff keep or change?
Post by: Mr Skrunts on 26 October 2009, 13:03:49: Quote
Can someone with access to TIS post up the V6 diff ratios please?

Tunnie, you have it the wron way around; a 2.5 manual fitted with a 2.5 auto diff goes like a rocket because the auto diff is lower geared (4.22:1 compared with 3.9:1 for the manual). Fuel consumption is higher though.

I cant remember the 3.0 ratios, I think the manual is 3.7 but dont know the auto.

I think they are listed on the Eligable cars list, the leaflet scans on ABS
Title: Re: Diff keep or change?
Post by: Mr Skrunts on 26 October 2009, 13:05:38: yes they are, under technical specs. :y
Title: Re: Diff keep or change?
Post by: Mr Skrunts on 26 October 2009, 13:15:15: TYPE
   CLUTCH

DIAMETER
   GEAR RATIOS    FINAL DRIVE RATIOS

                                          1       2                3                4                5          Rev.
Manual (2.5i)    228 mm    3.95:1    2.19:1    1.39:1    1.00:1    0.85:1    3.53:1    3.90:1
Automatic (2.5i)    -    2.40:1    1.48:1    1.00:1    0.72:1    -    2.00:1    4.22:1
Manual (2.5TD)    240 mm    3.81:1    2.11:1    1.34:1    1.00:1    0.76:1 3.40:1    3.45:1
Automatic (2.5TD)    -    2.40:1    1.48:1    1.00:1    0.72:1    -    2.00:1    3.45:1

TYPE
   CLUTCH

DIAMETER
   GEAR RATIOS    FINAL DRIVE RATIOS

                                    1       2                3             4       5                Rev.
Manual    240 mm    3.81:1    2.11:1    1.34:1    1.00:1    0.81:1    3.40:1 3.70:1
Automatic    -    2.40:1    1.48:1    1.00:1    0.72:1    -    2.00:1    3.90:1
Title: Re: Diff keep or change?
Post by: Kevin Wood on 26 October 2009, 13:59:08: 2.5 manual and 3.0 auto both have a 3.90 diff according to that so it should make no difference. :y

Kevin
Title: Re: Diff keep or change?
Post by: tunnie on 26 October 2009, 16:18:19: Quote
Can someone with access to TIS post up the V6 diff ratios please?

Tunnie, you have it the wron way around; a 2.5 manual fitted with a 2.5 auto diff goes like a rocket because the auto diff is lower geared (4.22:1 compared with 3.9:1 for the manual). Fuel consumption is higher though.

I cant remember the 3.0 ratios, I think the manual is 3.7 but dont know the auto.

I stand corrected :y
Title: Re: Diff keep or change?
Post by: Matchless on 26 October 2009, 22:52:57: So, for max acceleration (and fuel ;Dconsumption) fit a 4.22 diff from a 2.5V6 auto to your 2.5V6 manual.

Better still, fit a 3.0V6 with the 4.22 diff. ;D