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[Omegatoy]

2.5td manual box has short ratio,s in it? bell housing may need some mods to fit though!!

[Thomas-Elite]

2.5td manual box has short ratio,s in it? bell housing may need some mods to fit though!!

Fair point. Could be something to try. would be strong enough to handle the extra tourque to

[Kevin Wood]

Best thing you can do is to take the gear ratios for various Omega boxes (some are here:)

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

.. then plug them into a gear calculator such as this:

http://westfield-world.com/gtc.html

..and see what you're going to end up with.

The important factor for you is going to be the rev drop between gears. So, look at what speed you will hit your shift point in one gear, then find that speed in the next gear and see what engine speed you'll be doing. This is where you'll be after upshifting, so you can decide if you'll still be in the power or if it'll bog down.

Fair point. Could be something to try. would be strong enough to handle the extra tourque to

Will you have any extra torque? Torque is largely proportional to engine capacity so conventional tuning will just move the torque peak to higher RPM and give you more power. Unless you are going forced induction you won't have significantly higher torque.

Kevin

[Marks DTM Calib]

I would guess at a 6 speed box off a supra (or a T56) with an Omega auto bell housing plus an adaptor plate between the bell housing and box.

[2woody]

I would guess at a 6 speed box off a supra (or a T56) with an Omega auto bell housing plus an adaptor plate between the bell housing and box.

now I am really impressed - I have a Borg-Warner T5 sat in the shed ready to go in the track-day car using just that - an auto bellhousing with a welded-on rear plate.

the options as I see it are :-

use a standard gearbox and have done with it

use a Ford type 9 (5-speed) gearbox as per Kev's post

use a Caterham gearbox which is basically a 6-speed type 9

Toyota 6-speed will need a bespoke bellhousing

T56 will need a bespoke bellhousing and is damn near as heavy as the rest of the car ( I should know, I've just rebuilt one )

The ZF box will need a bespoke bellhousing

.... and any bespoke bellhousing I'd trust would be in the order of £2K

there does also come a point where you'll spend more time changing gear than putting down power in the gear.

My previous track-day Omega had a 2-litre gearbox in it from the moment I took the auto out.

[aaronjb]

T56 will need a bespoke bellhousing and is damn near as heavy as the rest of the car ( I should know, I've just rebuilt one )

Granted weight isn't as much of a concern for me, given it'll be sitting behind an iron V8 from 1967, but..

You don't happen to know if the Tremec TKO500/600 is any lighter than the T56, do you?

[2woody]

reckon they're about the same.

I suspect that there's a lot of shared architecture 

[aaronjb]

I thought that might be the case.. might as well stick the sixth cog on, then (Unless I happen across a fantastic deal on a TKO, of course)