4x4 Action Group

Grips have been thinking. It seems as if it is something he often does. When he has time of course.
So Grips thought that for 4x4ing the torque to weight ratio would be more important than the power to weight ratio.
I agree with Grips. When one is working at slow speeds torque counts most.

So, lets get some some Nm/weight ratios. OK?

210.5 N.m. /ton

Paj SWB with 441N.m.


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212NM/t

Jeep Wrangler TJ.
Not bad for a NA petrol.


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RooiTjiep @ 400nm/1840kg equates to 217 Nm/ton

275nm/t
My vrou se navara

235nm/t
Safari stasiewa, petrol

245nm/t
Safari bakkie, diesel

297nm/t. Soon to be safari

If the purpose is to show offroad power, then when you’re in low range, you need to multiply the reduction. Otherwise the thread doesn’t make sense.

That’ll really show how much force you’ve got.

Ek is aan stoei om vir my Mercedes w123 n crawl ratio van 348:1 te gee, met 500nm op engine...

XJ Junkie wrote:If the purpose is to show offroad power, then when you’re in low range, you need to multiply the reduction. Otherwise the thread doesn’t make sense.

That’ll really show how much force you’ve got.

I agree with you, but it's a starting point Neil. Apoc needs to revive the crawl thread that he started on the 4xwheelbarrowaxledesignforum

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I don’t think it’s a starting point because there are enormous variances in reduction ratios.

Multiplying zero usable torque results in zero usable torque. The torque converter of an autobox can be a useful benefit or have a negative influence, dependung on terrain. In thr same way extra low low range ratios can be positive or negative, depending on the specific situation. In other words no technical spec is always the "useful" one in all circumstances, but all comparissons have to start at some point.

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XJ Junkie wrote: ↑

Thu Aug 02, 2018 9:24 pm

I don’t think it’s a starting point because there are enormous variances in reduction ratios.

It would be nice if someone can show us how to work it out when the reduction of gears is considered. It will make this thread better and more complete.

1ste rat ratio x low range ratio x diff ratio
Bv
4 x 2 x 4.11=32.88 ratio
Nou moet jy nog torque en revs en band grootte ook in bring

Little Patrol 230kw and 500nm

384nm/t

Yank Ranger

272nm/t

Shows just how weight is a performance killer. With 70kw and 100nm more the Yank Ranger is defeated by the little v8 Patrol

I plan to build a 408 stroker for the Yank Ranger and strip off all items that add extra weight. Will then move the 347 stroker to Little Patrol.
This will give Little Patrol 461nm/t

What a lot of guys forget is that the moment you put in bigger tyres without out a diff ratio correction, the Nm will reduce in direct proportion to the percentage increase in tyre size.