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Title: TMH 5th gear ratio Post by: Nigel hpe on 27 December, 2024, 10:35:02 PM Hi all,
I'm aware that TMH used to supply an alternative 5th gear ratio that was 0.780:1 as opposed to the standard 0.925:1 I'd like to find out the teeth count on this pair of gears. A photo of same would be a huge bonus. Nigel Title: Re: TMH 5th gear ratio Post by: A1.6HPE on 30 December, 2024, 12:30:19 AM Is this referencing the Beta VX transmission?
I believe that some cars have been fitted with VX transaxles in order to get a more relaxed cruising speed. Leo Title: Re: TMH 5th gear ratio Post by: peteracs on 30 December, 2024, 08:09:02 AM Hi Leo
The TMH mod was for any Beta gearbox, not just the VX, it raised the gearing on the 5th gear only. The diff ratio remained the same. You are correct that you can fit a VX gearbox/diff as that had the highest ratio of diff used, the gearbox ratios essentially remained the same over all the Beta range. Peter Title: Re: TMH 5th gear ratio Post by: Nigel hpe on 30 December, 2024, 06:08:33 PM Is this referencing the Beta VX transmission? I believe that some cars have been fitted with VX transaxles in order to get a more relaxed cruising speed. Leo Hi Leo, I already have a VX box in my 2000 carb HPE and the result has been excellent. The performance has not significantly reduced and cruising is much quieter, I've now got 3000rpm at 70mph. If I could drop that even slightly more I'd be interested. I've now read that US spec Betas had a 5th gear ratio of 0.865:1, possibly a nice mid-way point. Peter, I think you're using a VX box in your build? Regards to both, Nigel Title: Re: TMH 5th gear ratio Post by: peteracs on 30 December, 2024, 11:05:32 PM Hi Nigel
Correct, will be interested to see what you find out about the US one. Peter |