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James

Mintylamb SU Needle Chart

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Hi all,

 

So, I finally got around to rewriting the SU needle charting page on my website.

I checked the wayback machine to see when it first made an archive — 2003!

Others will follow.

http://www.mintylamb.co.uk/suneedle

 

 

James

 

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james great news, you have no idea how many people will be hoping that this means the gear speed calculator may be resurrected at some point, one of lifes most useful tools!

alan 

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28 minutes ago, oldtuckunder said:

you have no idea how many people will be hoping that this means the gear speed calculator may be resurrected at some point, one of lifes most useful tools!

This! :smile:

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Hi, everyone!

yeah— so I've found out! I'll sort that soonish— much more soonish than when I said I'd sort the SU chart!

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2 hours ago, James said:

Hi, everyone!

yeah— so I've found out! I'll sort that soonish— much more soonish than when I said I'd sort the SU chart!

So you are the famous gearbox od calculator guru. I’ve heard mystical stories and miss the calculator or was it a dream ?

 

 

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17 hours ago, Hamish said:

So you are the famous gearbox od calculator guru. I’ve heard mystical stories and miss the calculator or was it a dream ?

 

 

Everything is a dream.

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Guru status James....  :blink: :bow:

Truly you are living the dream :biggrin:

All joking apart, your gearing calculator has no equal that I have found (and I looked quite extensively when mintylamb went MIA).

Do you still have a Triumph in your life?  I did hear that the saloon had had some love quite recently?

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Guru... not sure about that...

Does anyone remember what the gearing calculator output was? I don't remember and not sure I can be bothered to install all the stuff to find out.

I still have my saloon — it was done up in 2017. It all looks super fancy now.

 

James

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+1 on the gear calculator, extremely helpful! When it disappeared I had to make a spreadsheet to replace it...

I have a screenshot from "back in the day" when I used it to work out if a 3.89 was too much or not... This was after selecting tyre size, diff ratio, gearbox, OD rev limit.16910626_10154821965316131_2050861338_o.thumb.png.f902f54576ff0743f7cb6b7630f1e31d.png

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That's brilliant David!  About all I could remember is that it was a table and I'd worked out from it that I ought to be able to manage 60 in second with only a relatively minor infringement of the red line....

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Thanks, David. Like some kind of ancient artefact — you should keep hold of that!

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James

Its great to have that web page back again. Thankyou!

Very minor tweak I think the second table column 1 heading should be MPH instead of RPM.

cheers

mike

 

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Good stuff, I've updated the stuff on my site to link back to the motherlode of triumph tools :) All we need now is a friendly dragon and it'll be like 2002  again!

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1
1 hour ago, mpbarrett said:

Very minor tweak I think the second table column 1 heading should be MPH instead of RPM.

This is a good question — I am not sure that is the row or column title or if it should refer to the contents of the cells themselves.

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Hi Folks,

 that all looks very clever and tasty. I'm rather new to this.

I take it that the line with  3.746, 2.158 etc are the gear ratio's

Would the 3.89 be the diff ration  - I'm sure it is.

 

Roger

 

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On 4/30/2019 at 9:56 PM, James said:

Well, I sorted all the maths this evening.

Added a feature that highlights RPM in a defined powerband.

http://mintylamb.co.uk/gearspeed/

 

Looking very good, glad to have it back and with new features!

Question about the overdrive ratios, they seem quite high to me. Admittedly, I'm not sure on the maths for planetary gear sets. But if the output spins 1.25:1 then the reciprocal ratio 1/1.25 = 0.8, seems more correct? This agrees with the print out from the original calculator that Hamish posted (A-type 22% -> 1/1.22 = ~0.82).

Canley Classics' table seems to agree with this: https://www.canleyclassics.com/technical-archive/different-differentials

What do you think?

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I think you might be right—?

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