Reverse traction

fullthrottle · Post by **fullthrottle** » Fri Nov 30, 2012 6:55 pm

I've noticed that I can climb hills in reverse, much better than going forwards. Was having a play with it today and sure enough, every time a much better result in reverse.

Could this be something to do with the way the LSD in the rear locks up?

May have to start doing the trips in reverse instead

Could be interesting :lol:

Nigel Bannan · Post by **Nigel Bannan** » Fri Nov 30, 2012 7:00 pm

What tyres are you running?

Ralfie · Post by **Ralfie** » Fri Nov 30, 2012 7:01 pm

More to do with the weight over the wheels (engine) helping traction.

tweake · Post by **tweake** » Fri Nov 30, 2012 7:25 pm

a lot of lsd diffs are worse in reverse. they lock up less in reverse than forwards.
weight and gearing i guess would be the main reasons.

tow99 · Post by **tow99** » Fri Nov 30, 2012 7:34 pm

reverse is lower than first gear because of the idler gear used to reverse the direction.so there is more torque multiplication occuring so easier to break traction aswell as less weight etc and to some extent suspension design

Sadam_Husain · Post by **Sadam_Husain** » Fri Nov 30, 2012 7:39 pm

the theory runs out when momentum comes into play.... you cant go as fast in reverse as you can in your forward gears Ants

fullthrottle · Post by **fullthrottle** » Fri Nov 30, 2012 7:48 pm

I'm sure those speedway cars race in reverse gear?? Don't they?

Only thing I can work out is that in reverse, the front is on the downhill side, so with all that weight bearing down onto the front wheels, the traction bites a lot more.

Going forwards the front is much lighter and well the back is light anyway. So less traction/bite.

Next time I get stuck going forwards, try it in reverse

tow99 · Post by **tow99** » Fri Nov 30, 2012 7:51 pm

which speedway cars might they be?

fullthrottle · Post by **fullthrottle** » Fri Nov 30, 2012 7:53 pm

tow99 wrote:which speedway cars might they be?

I think they are called Super Saloons. Shit its been many years since I used to hang out there.

mudlva · Post by **mudlva** » Fri Nov 30, 2012 7:58 pm

its all good until your cvs get out and walk :lol:

tow99 · Post by **tow99** » Fri Nov 30, 2012 7:58 pm

i would have thought that 800hp going through a idler gear between the main and lay shafts wouldn't last too long.could be wrong though.that would also mean they would have to take off and race in the same gear.

fullthrottle · Post by **fullthrottle** » Fri Nov 30, 2012 8:05 pm

Yeah its been a while, could be completely wrong. But I seem to remember they use it this way because the ratio allows them to wind it out longer. They never actually change gear.

Will have to do some research now. Maybe a night out at the speedway.....
Anyone keen

rangimotors · Post by **rangimotors** » Fri Nov 30, 2012 8:17 pm

U sure its not because your rear end has much better flex than your front so both wheels stay on the ground and get much better bite with less slip.

With your ifs front you will find as you loose weight on one wheel (doesnt have to lift off ground) that u start spinning that wheel and loosing all forward momentum.

tow99 · Post by **tow99** » Fri Nov 30, 2012 8:22 pm

if you wanted to see super salons they had a meeting here last weekend and are on a north island tour/championship so might not be back down for a while. wellington modified champs this weekend

tweake · Post by **tweake** » Fri Nov 30, 2012 8:34 pm

i havn't been to speedway for ages.
with nz short tracks they only use one gear. modifies etc don't have gears.
not sure what boxes super salons have, i would not be surprised if they run two speed boxes which you can get in from the states.

fullthrottle · Post by **fullthrottle** » Fri Nov 30, 2012 8:35 pm

rangimotors wrote:U sure its not because your rear end has much better flex than your front so both wheels stay on the ground and get much better bite with less slip.

Yeah fairly sure. The hill doesn't really have any bumps or holes. Its just a nice ramp up until nearly verticle

tow99 · Post by **tow99** » Fri Nov 30, 2012 8:38 pm

the only cars that dont have gears are sprint cars thats why they require a push start and can't go slow .modifieds etc run al sorts of gearboxes.cf bed ford landcruiser hq etc.most of the time they will take off/cruise in one gear and race in another

slide · Post by **slide** » Fri Nov 30, 2012 8:50 pm

fullthrottle wrote:I've noticed that I can climb hills in reverse, much better than going forwards. Was having a play with it today and sure enough, every time a much better result in reverse.

Are you talking good traction (gravel), or slippery (grass) or uneven surface (rutted)?

tweake · Post by **tweake** » Fri Nov 30, 2012 9:40 pm

tow99 wrote:the only cars that dont have gears are sprint cars thats why they require a push start and can't go slow .modifieds etc run al sorts of gearboxes.cf bed ford landcruiser hq etc.most of the time they will take off/cruise in one gear and race in another

sprint cars need push start because they have no starters.
modifieds, which is a poor mans sprint car, has starter, clutch, and in/out straight through gearbox. (maybe they run two speed boxes these days). ratios are done with quick change diff.
salons all run gearboxes.

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