Crawl Ratio??

[Wisha Haddan H3]

Originally Posted by GotSandH3

69:1 sounds like a great ratio. How does that compare to brands such as Jeeps and Toyotas??

It's best in class for 2006 models, but the 2006 JK Rubicon Ultd will beat it next year. The source I used for this graph supplied different numbers than the ones in this thread. I'll update them when I get a chance.

[Wisha Haddan H3]

In the Automatic, the H3 will have best in class crawl ratio bar none. (Here are some updated graphs ... easier to read.

[HummBebe]

Wisha, can you do a power to weight ratio comparison??

[Wisha Haddan H3]

Originally Posted by HummBebe

Wisha, can you do a power to weight ratio comparison??

Sure, but imho you have to factor in the gearing to get the whole picture. Here ya go.

[Wisha Haddan H3]

Here's a chart for Geared Crawl HP to Weight ratio

[HummBebe]

I heart teh neeeerds

[Wisha Haddan H3]

Here's a look at the Geared Torque - Weight ratio

[Michael1]

Originally Posted by Wisha Haddan H3

It's best in class for 2006 models, but the 2006 JK Rubicon Ultd will beat it next year. The source I used for this graph supplied different numbers than the ones in this thread. I'll update them when I get a chance.

You forgot the Dodge Power Wagon with manual transmission at 78.3. That ought to be enough for any of you ladies.

Michael

[f5fstop]

Actually, I found the 56:1 ration quite substantial and almost felt too low from my Jeep days.

After spending 4.5 hours cleaning red dust out of the interior, treating the leather, pressure washing the red tires back to black, washing the vehicle, all in 90+ humid heat, my personal crawl ratio is lower than any on that chart.

[HummBebe]

poor f5....would you like me to get you a Lemonade???

[Idaho-Hummer]

Nah, he just needs some cheese to go with that wine.

[f5fstop]

Originally Posted by HummBebe

poor f5....would you like me to get you a Lemonade???

Prefer Captain Morgan's Silver....

In the Kroger Parking Lot after the wash job:


Eye of the Whale Arch, Arches NP:


Monument Valley (darn kid in the way and taking photos):

[rkcrawl]

There are advantages to both: Manual vs Auto.

I have run both in competive (UROC Rockcrawling competitions) environments.

The biggest advantage, IMO, is down hill engine braking. A super low crawl ratio in a manual transmissioned vehicle gives you excellent control of the vehicle (way more then an auto) as long at the tires have traction.

Auto's on the other hand are a ton easier to drive, you've got one less peddle to deal with and very granular control of the vehicle motion. And yes, the GENERAL consensus in the 4x world is a factor of 2 when considering the torque convertor in the crawl ratio, however its just that when CRAWLING at low rpms. Its not exact, nor scientific, but I can tell you from the seat of the pants, its noticable when crawling level or uphill grades. I drove my old rig with both, and the only change being going from a SM465 4 speed with a granny 1st gear to a Turbo 350 with a full manual valve body. The difference was VERY noticable. The TC is not a factor down hill. Thats the auto's biggest disadvantage (again, just my opinion) because you need to rely more on the vehicle brakes, rather then engine braking. I think the second biggest issue/concern is transimssion failure potential.

[f5fstop]

Originally Posted by rkcrawl

There are advantages to both: Manual vs Auto.

I have run both in competive (UROC Rockcrawling competitions) environments.

The biggest advantage, IMO, is down hill engine braking. A super low crawl ratio in a manual transmissioned vehicle gives you excellent control of the vehicle (way more then an auto) as long at the tires have traction.

Auto's on the other hand are a ton easier to drive, you've got one less peddle to deal with and very granular control of the vehicle motion. And yes, the GENERAL consensus in the 4x world is a factor of 2 when considering the torque convertor in the crawl ratio, however its just that when CRAWLING at low rpms. Its not exact, nor scientific, but I can tell you from the seat of the pants, its noticable when crawling level or uphill grades. I drove my old rig with both, and the only change being going from a SM465 4 speed with a granny 1st gear to a Turbo 350 with a full manual valve body. The difference was VERY noticable. The TC is not a factor down hill. Thats the auto's biggest disadvantage (again, just my opinion) because you need to rely more on the vehicle brakes, rather then engine braking. I think the second biggest issue/concern is transimssion failure potential.

Are you saying in an auto the transfer case is not a factor? I just finished some extremely steep mountain roads in Canyonlands (park and area), and in 4-low lock, the car hardly moves downhill, in fact, you have to gas it a few times. In 4-wheel hi lock, it crawls a lot slower than when in 4-wheel non-lock. This was in first or second gear, not in drive.
I have also driven a Jeep manual down the same roads, and with the manual, I had to use the brakes (first or second gear). Granted the H3 has a 4:1 while the Jeep did not, but if I'm reading you correctly, you are saying the t/case has no affect on downhill? That I will dispute, since I have tried all the ranges and there is a noticeable difference.