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Hummer Forums by Elcova (http://www.elcovaforums.com/forums/index.php)
-   Technical Discussion and Customizing your H3 (http://www.elcovaforums.com/forums/forumdisplay.php?f=26)
-   -   Crawl Ratio?? (http://www.elcovaforums.com/forums/showthread.php?t=18464)

GotSandH3 07-14-2006 01:30 AM
Re: Crawl Ratio??
 
69:1 sounds like a great ratio. How does that compare to brands such as Jeeps and Toyotas??

PARAGON 07-14-2006 01:51 AM
Re: Crawl Ratio??
 
Quote:
Originally Posted by f5fstop
Every equation I have ever seen for a crawl ratio has never taken into account the torque converter. Reason is it is next to impossible since the converter slips at a different rate at different engine rpms. Therefore, the calculation would be next to impossible. You would have to figure out all the different rpms you would have in a given range.
All crawl ratios are figured without the torque converter taken into account by any manufacturer I have ever seen.
I have seen calculations for the H1, but it also takes into account the wheel multipliers too.
as flywheel RPMs increase the torque converter is less and less efficient. The torque multiplication only occurs during a small RPM range on most small trucks due to many reasons. With electronics controlling lockup, along with the inefficiency of the converter itself, it's moot to consider it a factor for crawl ratio.

If one could effectively figure out the actual RPM range to hold the vehicle at and the electronics wasn't controlling the converter, you would burn the converter up and overheat the transmission.

Michael1 07-14-2006 06:19 AM
Re: Crawl Ratio??
 
Crawl ratio with an automatic is just about meaningless anyway, with the torque converter disconnecting the driveline from the engine. Unless you like to launch off the top of rocks, and test your brake reflex skills, get a manual, with which the H3 has an exemplary crawl ratio.

Michael

f5fstop 07-14-2006 10:41 AM
Re: Crawl Ratio??
 
Quote:
Originally Posted by Michael1
Crawl ratio with an automatic is just about meaningless anyway, with the torque converter disconnecting the driveline from the engine. Unless you like to launch off the top of rocks, and test your brake reflex skills, get a manual, with which the H3 has an exemplary crawl ratio.

Michael

I will never have a manual, again, for off-roading. Too many times you have to ride the clutch to get out of sand, over rocks, etc., and if you have to stop going uphill, an auto makes it a lot easier.:D
When riding over a boulder with a manual, you have the same problem at a very low speed, you ride the clutch, then have to test your brake reflex skills just like an auto.

PARAGON 07-14-2006 03:24 PM
Re: Crawl Ratio??
 
Quote:
Originally Posted by f5fstop
I will never have a manual, again, for off-roading. Too many times you have to ride the clutch to get out of sand, over rocks, etc., and if you have to stop going uphill, an auto makes it a lot easier.:D
When riding over a boulder with a manual, you have the same problem at a very low speed, you ride the clutch, then have to test your brake reflex skills just like an auto.
agreed

besides, crawl ratio is something web wheelers get all warm and fuzzy about

GotSandH3 07-14-2006 03:29 PM
Re: Crawl Ratio??
 
Same here! I regret getting a manual transmission for four wheeling. My last truck was an auto and was a lot better!!

h2co-pilot 07-14-2006 04:13 PM
Re: Crawl Ratio??
 
No no no. Don't fret. I rode along with " 4-lo" (I dunno if that is his name here or not) in Tellico. He had a Yota pick-up manual and it was sweet.

There are a lot of things you can do with it that help you tailor the tranny. It really crawls in 1st. He taught me some moves with his shifter (;)) when turning and maneuvering around, it was a lot of work but pretty darn cool.

There are manual techniques that are to your advantage. You just have to stay off the clutch. Plus they are easier to fix etc. Maybe you could check it out or pm him and ask.

NEOCON1 07-14-2006 05:24 PM
Re: Crawl Ratio??
 
I prefer an auto for offroad :D jmtcw;)

usetosellhummer 07-14-2006 06:03 PM
Re: Crawl Ratio??
 
Auto, good enough for H1 and H2 good enough for me and my three

HummerNewbie 07-14-2006 07:56 PM
Re: Crawl Ratio??
 
Quote:
Originally Posted by h2co-pilot
No no no. Don't fret. I rode along with " 4-lo" (I dunno if that is his name here or not) in Tellico. He had a Yota pick-up manual and it was sweet.

Ken had a fun and wild ride across the creek with him at the bottom of #5 on Sunday night too :eek: :cool:

Wisha Haddan H3 07-14-2006 07:59 PM
Re: Crawl Ratio??
 
1 Attachment(s)
Quote:
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 07-14-2006 08:02 PM
Re: Crawl Ratio??
 
1 Attachment(s)
In the Automatic, the H3 will have best in class crawl ratio bar none. (Here are some updated graphs ... easier to read.

HummBebe 07-14-2006 09:21 PM
Re: Crawl Ratio??
 
Wisha, can you do a power to weight ratio comparison??

bjc 07-14-2006 09:46 PM
Re: Crawl Ratio??
 
Quote:
Originally Posted by f5fstop
Too many times you have to ride the clutch to get out of sand, over rocks, etc., and if you have to stop going uphill, an auto makes it a lot easier.:D
When riding over a boulder with a manual, you have the same problem at a very low speed, you ride the clutch, then have to test your brake reflex skills just like an auto.

I think offroad driving techniques really aren't that different for automatics vs. manuals. Brake-throttle-modulation techniques used for wheeling automatic transmissions are comparable to feathering the clutch in manuals. There are times I love the control of a manual (usually offroad), and times I wish I had an automatic (like when I go to pay a parking garage attendent located on a steep grade and some A-hole pulls up 2 inches behind me).

Michael1 07-14-2006 10:46 PM
Re: Crawl Ratio??
 
Quote:
Originally Posted by f5fstop
When riding over a boulder with a manual, you have the same problem at a very low speed, you ride the clutch, then have to test your brake reflex skills just like an auto.

Have you tried an H3 rock crawling with the 4:1 transfer case and adventure package? With a 68 to 1 crawl ratio, how much riding of the clutch do you need to do? That thing barely moves. That thing eats rocks for lunch with the clutch fully engaged. No slipping requred.:D

Michael

Wisha Haddan H3 07-14-2006 11:26 PM
Re: Crawl Ratio??
 
1 Attachment(s)
Quote:
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 07-14-2006 11:55 PM
Re: Crawl Ratio??
 
1 Attachment(s)
Here's a chart for Geared Crawl HP to Weight ratio

HummBebe 07-15-2006 12:08 AM
Re: Crawl Ratio??
 
I heart teh neeeerds:D :D

Wisha Haddan H3 07-15-2006 12:41 AM
Re: Crawl Ratio??
 
1 Attachment(s)
Here's a look at the Geared Torque - Weight ratio

HummBebe 07-15-2006 12:44 AM
Re: Crawl Ratio??
 
THAT"S more like it!!!


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