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Author Topic: 2.5 Gearbox on a 3.0?  (Read 1175 times)

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omegalord

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2.5 Gearbox on a 3.0?
« on: 12 October 2007, 14:38:57 »
TB told me a while ago that the 2.5 is about the same on acceleration as the 3.0 due to different gearing.

Is it possible to put the 2.5 box on a 3.0?
If so it should be rapid on acceleration then shouldnt it?

And would the 2.5 box be able to cope with the 3.0 extra power , and poss 250bp if tuned?

Matt
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TheBoy

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Re: 2.5 Gearbox on a 3.0?
« Reply #1 on: 12 October 2007, 14:41:06 »
Quote
TB told me a while ago that the 2.5 is about the same on acceleration as the 3.0 due to different gearing.

Is it possible to put the 2.5 box on a 3.0?
If so it should be rapid on acceleration then shouldnt it?

And would the 2.5 box be able to cope with the 3.0 extra power , and poss 250bp if tuned?
Matt
If you are talking the autobox, not a hope in hell.

Also, I believe most of the gearing difference (not all though) is on the diff.
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omegalord

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Re: 2.5 Gearbox on a 3.0?
« Reply #2 on: 12 October 2007, 14:46:32 »
No im on about a proper manual gearbox.

 :)
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TheBoy

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Re: 2.5 Gearbox on a 3.0?
« Reply #3 on: 12 October 2007, 14:50:01 »
Quote
No im on about a proper manual gearbox.

 :)
I think the 2.5 manual is rated to 250Nm, the 3.0l manual to 280Nm.  So it depends on torque you are aiming for.

Though I suspect Vx fitted a bigger box to 3.0l for a reason....
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omegalord

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Re: 2.5 Gearbox on a 3.0?
« Reply #4 on: 12 October 2007, 14:51:51 »
I know its a big job but it would be possible to use the 3.0 bellhousing and put the 2.5 ratios in wouldnt it?

Matt
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JamesV6CDX

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Re: 2.5 Gearbox on a 3.0?
« Reply #5 on: 12 October 2007, 16:39:30 »
Quote
I know its a big job but it would be possible to use the 3.0 bellhousing and put the 2.5 ratios in wouldnt it?

Matt

The bellhousing for both boxes will be the same, it's the internals that will be different.
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Martin_1962

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Re: 2.5 Gearbox on a 3.0?
« Reply #6 on: 12 October 2007, 18:49:25 »
FInal drive I think
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Paul M

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Re: 2.5 Gearbox on a 3.0?
« Reply #7 on: 12 October 2007, 20:34:54 »
Both the final drive and gearbox ratios on the 2.5 are different from the 3.0. The actual figures are on autobahnstormers.com

To be honest I don't think it's worth the effort, doing both combined only lowers the ratios about 10% in 5th. Yes the gearing is too high IMO, but the 2.5 isn't that much better. I seem to remember the guy who used to race Omegas on here (can't remember his username  :-[ ) had a significantly higher diff ratio in one, giving a much lower overall ratio. Not sure where he got it though as there isn't much choice for factory Omega diffs and I don't know what else will fit.
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