| [ Total Views: 810 | Total Replies: 6 | Thread Id: 19268 ] |
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 vwtyp2
Son of Jim - Creator of Good
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| posted on February 20th, 2004 at 08:32 AM |
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working out gear ratios
what's the secret formula for working out gear ratios?
Looks like I'm gonna be rebuilding a box for my bus, rather than worrying about any further conversions.
this is what i was thinking.....
it needs a taller 1st anyway, as soon as you stand on the gas in 1st, it's straight on the rev limiter.
I was thinking on using a 1st somewhere between the 1st and 2nd I've got now, use my Albins standard 3rd as a 2nd, the Albins 0.70 4th in 3rd,
then an even taller 4th. shohld be able to cruise the highway about 140 kph at about 3000 rpm, and around the city 60kph at 2000 rpm in third.
make it kinda like a 3 speed + overdrive.
how do I work out what Ratios I need?
Most people seem normal, till you get to know them.
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lugnuts
A.k.a.: Mike
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| posted on February 20th, 2004 at 01:22 PM |
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Has it got the motor to pull those high ratios your thinkin bout.:o |
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BiX
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| posted on February 20th, 2004 at 03:16 PM |
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You say u redline in 1st straight away? Is this on the flat what happens when u have to do a steep hill start? etc. I would leave 1st and just adjust
3rd and 4th. Just remember if u have the taller gears is the engine going to be able pull that gear as lugnuts said? |
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ash logan
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| posted on February 20th, 2004 at 03:32 PM |
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Gear Head
This is a calculator type contraption that i think you willl find quite handy.
http://www.cvsr.net/php/links.php
It is called Gear Head, look down a bit and it is right there!
[Edited on 20-2-2004 by ash logan]
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twoguns
Compulsive Aussie Vee Dubber
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| posted on February 20th, 2004 at 04:09 PM |
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and i might be wrong, but i read somewhere that the rpms the engine run at, also affect the cooling effect. so if you drop the rpm too much would your
motor slowly build up heat on a long trip?
Simply Cruzin'...
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Baja Wes
Bishop of Volkswagenism
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| posted on February 20th, 2004 at 04:24 PM |
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I believe he has a V6 in the kombi, so no beetle cooling issues to worry about.
If you have access to microsoft Excel 2000 or higher, then my Excel dyno will do exactly what your after and more
http://www.aussieveedubbers.com/forum/viewthread.php?tid=18037
So, do you have Excel?
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wacked1
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| posted on February 20th, 2004 at 08:44 PM |
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Yes this has a 3.8L V6 in it!
YOU HAVE JUST BEEN DAKED
don't worry it's a VW thing
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vwtyp2
Son of Jim - Creator of Good
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| posted on February 20th, 2004 at 09:23 PM |
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yep. no need to worry about horsepower, or air cooling.
it'll beat any normally aspirated 4 or anything up to a vs commodore or ef falcon to 100 kph.
but then I run out of go at about 140 kph. I want to be able to hit at least 100 mph.
Most people seem normal, till you get to know them.
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70AutoStik
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| posted on February 21st, 2004 at 01:41 AM |
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You might actually have trouble finding the taller ratios you're looking for, why not start with a higher final drive?
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