924Board.org

[teo]

Hey guys,

I just did some calculations on the different types of 924 transmissions, speed as a function of engine rpm - wheel size - gear ratios.

There are some interesting results, and if the calculations are right and the type 016Z is the one also known as the "snailshell", now I know why everyone likes them.

Would you check it and tell me if I made some mistake in it?

http://web.matavnet.hu/teoinfo/p924/transmission.htm

Teo

[ This Message was edited by: teo on 2001-11-24 04:51 ]

[teo]

Hmm, so I couldn't get it right for first time, now it's fixed.

Teo

[cs]

nevermind, i see you've already figured it out.

engine rpm/(gear ratio*axle ratio)= wheel rpm
wheel rpm*circumfrence of tire=ft/min
ft/min * 60/5280= miles/hour
example: numbers are just estimates of what i remember, in first gear at 6000 rpm
6000/14=428.571
428.571*6=2571.43
2571.43*60/5280=29.2208mph


[ This Message was edited by: cs on 2001-11-24 20:08 ]

[Joes924]

Thats pretty impressive kind of ..

[larso]

The turbo snailshell is the only tranny that makes the 931 look fast on paper, since it goes to 60 with the old rev limiter in second....

[924RACR]

I hate to break your heart, but Jon did this a while ago in a spreadsheet:
http://www.924.org/Downloads/Downloads.htm

It's the one labeled tranny ratios...

_________________
Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

[teo]

No problem, a few minutes ago I've even found it on my HDD saved from the site

So, before I start doing something I should check:

1: http://www.924.org
2: my own computer
3: the entire internet (I've found quite a few sites with rpm/speed calculators, of course only after I've done mine)

Anyway, I'm just learning this automotive stuff, and a little excerise will not hurt... even if it's only the theoretical side.

Teo