goodall
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| posted on 21/1/07 at 10:12 PM |
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6:1 to low of a final drive ratio?
would give some good acceleration but i think top speed maybe a problem or would you beable to get to 110mph and hit that brick wall that the locost
cant go past
5:1 be any better?
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goodall
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| posted on 21/1/07 at 10:25 PM |
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its two diff ratios multiplied together, center diff is 1.5:1 and the second diffs will be about 4:1 so 1.5X4=6
does anyone know of any programs that can calculate what your gearing should give you?
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Mark Allanson
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| posted on 21/1/07 at 10:33 PM |
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Try this
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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russbost
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| posted on 21/1/07 at 10:41 PM |
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Suitable cec ratio 3.8:1, suitable bec ratio 3.2:1.........................
6:1 !!!!!!!!!!!!!!! = 0-40 in 2.8 secs, top speed of about 68mph unless your engine revs to about 15,000 
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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goodall
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| posted on 21/1/07 at 11:39 PM |
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well max speed on public roads is 70mph, ok i'll use a hell of a lot of fuel but who cares, its only temporary until i get a diesel east-west
gearbox then it will be more suitable i hope
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JoelP
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| posted on 21/1/07 at 11:50 PM |
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whatever the speedlimit may be, you dont want to be doing max rpm at 70mph, you will drive yourself mad.
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James
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| posted on 22/1/07 at 09:13 AM |
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quote:
Originally posted by goodall
well max speed on public roads is 70mph, ok i'll use a hell of a lot of fuel but who cares, its only temporary until i get a diesel east-west
gearbox then it will be more suitable i hope
Sorry, don't know the specifics of your build, but what's wrong with using a 'normal' gearbox? Type9 or whatever?
Cheers,
James
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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goodall
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| posted on 22/1/07 at 12:04 PM |
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i'm going for all wheel drive rather than being the rear wheel drive with ford parts, i'm not woried for top speed as i'l be on R
plates for the first year of my driveing and they restrict you to 45mph
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NS Dev
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| posted on 22/1/07 at 12:07 PM |
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I have been on a tarmac rally in an escort forest rally car with a 5.1:1 diff in it, that was "interesting"
the speedo didn't work but calculated max at 10,000 rpm (millington diamond 2.0 engine) was approx 118mph and it got there remarkably quickly!!!
(on the isle of mull as well, not exactly large roads!!!)
6:1 will certainly be painfull for road use!!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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James
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| posted on 22/1/07 at 03:39 PM |
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quote:
Originally posted by goodall
i'm going for all wheel drive rather than being the rear wheel drive with ford parts,
Why 4x4? You got some kids to take to school in it? 
Why not use the Sierra 4x4 setup? As per Liam's car and the Dax Quadra?
Cheers,
James
[Edited on 22/1/07 by James]
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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goodall
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| posted on 22/1/07 at 05:00 PM |
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dareing to be different is one reason, second i have all the parts already to do it this way and thrid i like awd best
looks like i mite beable to bring it down to 4.9:1 if i cut part of the gearbox houseing, so that may not be so terrible after all
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goodall
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| posted on 22/1/07 at 05:01 PM |
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if you count me bringing myself to school then yes i do have kids to bring to school in it
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Liam
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| posted on 22/1/07 at 05:47 PM |
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Just interested in what parts you're talking about here? So have you found a conventional transverse setup with only a 1.5 final drive!? Is
there anything in particular holding you to the 4:1 front and rear diffs? Something like landrover freelander rear diffs could be used - they are
light and only 3.21:1. Maybe a bit pricey, but there might be other stuff. Old bmw 3 series diffs have a huge range of ratios too if i recall...
Liam
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NS Dev
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| posted on 22/1/07 at 06:27 PM |
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Rover sd1 and ford atlas axles both used 3.08:1 cwp's (which are also cheap CWP's cos noone wants them)
You can cut the axle tubes off and turn em into independent diffs pretty easily, seen it done a few times.
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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goodall
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| posted on 22/1/07 at 06:31 PM |
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the two diff that will be used front and back are spitfire diffs, as for the center diff it will be modified by use of a chain and two sprockets and
flipping it left to right and fitting the smallest possible sprocket on the diff and the largest possible sprocket to the output shaft, the best ratio
i think i can achieve by doing this with out cutting anything is about 1.5:1 or 3:2. as for buying diff and the like thats probably a no cause its
just experimental at this point so i dont want to waste too much money if things go sour.
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goodall
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| posted on 22/1/07 at 06:33 PM |
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emm sounds like those maybe useful to know about thanks, always help to keep costs down in case i dont like my creation
p.s i was typing the other reply as you posted
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TL
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| posted on 22/1/07 at 07:30 PM |
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Liam,
read Goodall's other post (a couple of days old) "Spitfire diffs anygood". All will be revealled.
[Edited on 22/1/07 by TL]
Cheers,
Terry
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