Crawl ratio for rock racing?

HammerdownJustin · 10-19-2009, 06:51 PM

Did some searching but guess I am not typing it in right.Wondering what the average crawl ratio people are using in Rock Race events?I am thinking around 35 to 1 give or take a few would be good but figured I would ask.

patooyee · 10-19-2009, 06:54 PM

Is it still called a "crawl" ratio if you're racing???

I know I blow your mind ...

J. J.

HammerdownJustin · 10-19-2009, 07:01 PM

Quote:

Originally Posted by patooyee

Is it still called a "crawl" ratio if you're racing???

I know I blow your mind ...

J. J.

Couldn't except anymore of you..what is the ratio on that airborne beast of yours..

wngrog · 10-19-2009, 07:08 PM

Short course or endurance?

bushauler · 10-19-2009, 07:11 PM

Quote:

Originally Posted by wngrog

Short course or endurance?

id be interested to hear what ratios/drivetrains the endurance/koh guys are using

patooyee · 10-19-2009, 07:13 PM

My build now is 50:1 not including converter. My old rig was 34:1 with 42's. To be honest back then it was too high for what i did but probably good for rock racing with the power that I had. (Mild SBC350.) I'm not a racer though so I'm probably not a good source of knowledge there. Sorry to waste your time.

Draggbody is who I compare my specs with since we wheel together. He has a mild BBC454 with an SM465 and when he's trying to go fast never even puts the t-case in low range. That puts him around 16:1 in first gear I believe. (he doesn't use granny in that case and spends most of his time in 2nd gear anyway.) He recently won SETTC and dominated the speed courses so that may be informative for you. I wouldn't say that he was exactly in a field of fellow racers though. He runs 40's.

J. J.

DOUG38S · 10-19-2009, 07:19 PM

5.13's/2.5 first/3.0 atlas 2500 stall. whatever numbers it works out to be. never did it. goes pretty good.

redneck23ms · 10-19-2009, 07:25 PM

Quote:

Originally Posted by DOUG38S

5.13's/2.5 first/3.0 atlas 2500 stall. whatever numbers it works out to be. never did it. goes pretty good.

38.475:1 not counting the convertor

blacksheep10 · 10-19-2009, 07:33 PM

tires play into it. You need more gearing to feel the same with 42's then with 37's. That said mid to upper 30's with 40" tires. This is speaking to xrra type stuff/rock bouncing. I think Randy at jimmy's says around 42:1. I'm goint to be about 38:1 in mid like doug

HammerdownJustin · 10-22-2009, 04:03 PM

Thx for all the info..I am looking at 727/dana 300/ 5.13 gears.Was hoping the mid 30's would be good.Also going with a 37 or a 39 not sure yet.

onetoncv · 10-22-2009, 04:25 PM

I like doug's #'s- Jess

Bigrockbronc · 10-22-2009, 09:42 PM

I'm currently 31:1, and it feels great for racing. I do notice when slow crawling that it's pretty high. I used to be 43:1 and I think the rig is faster now with the higher gearing. Before, the 1st gear rapped so quick, i lost time between the 1-2 shift. Now, 1st can hold longer and pulls harder. Tranny is a 4l60E (3.06 1st i believe) and the t-case is a np205 with 5.13 r&p.
If i were building a multi-purpose rig, i think a 3 or 4spd case would be the ticket, that way you have more control in the slow rocks but have the mid range for the speedy stuff. I guess it depends on what you will be doing with your rig. If only racing, mid 30's would be great. But if you wanna crawl some, like rec wheeling, deeper would def be better. I got plenty of motor to overcome, but it's real jumpy in the rocks.

10-19-2009, 06:51 PM	#1
HammerdownJustin Registered User Join Date: Jan 2008 Member # 106812 Posts: 149	Crawl ratio for rock racing? Did some searching but guess I am not typing it in right.Wondering what the average crawl ratio people are using in Rock Race events?I am thinking around 35 to 1 give or take a few would be good but figured I would ask.

10-19-2009, 06:54 PM	#2
patooyee Pirate4x4 Addict! Join Date: May 2001 Member # 4821 Location: Gulf Breeze, FL Posts: 5,365	Is it still called a "crawl" ratio if you're racing??? I know I blow your mind ... J. J. __________________ www.patooyee.com Build thread Last edited by patooyee; 10-19-2009 at 06:54 PM.

10-19-2009, 07:08 PM	#4
wngrog Moderating Midget Join Date: Jun 2000 Member # 1154 Location: Canton, MS Posts: 19,098 Blog Entries: 2	Short course or endurance? __________________ Nolen Grogan CottonLand Cruisers www.rockmidgetphotography.com blacksheep4x4.com USAF Veteran 1988-1998 GOD Bless America

10-19-2009, 07:13 PM	#6
patooyee Pirate4x4 Addict! Join Date: May 2001 Member # 4821 Location: Gulf Breeze, FL Posts: 5,365	My build now is 50:1 not including converter. My old rig was 34:1 with 42's. To be honest back then it was too high for what i did but probably good for rock racing with the power that I had. (Mild SBC350.) I'm not a racer though so I'm probably not a good source of knowledge there. Sorry to waste your time. Draggbody is who I compare my specs with since we wheel together. He has a mild BBC454 with an SM465 and when he's trying to go fast never even puts the t-case in low range. That puts him around 16:1 in first gear I believe. (he doesn't use granny in that case and spends most of his time in 2nd gear anyway.) He recently won SETTC and dominated the speed courses so that may be informative for you. I wouldn't say that he was exactly in a field of fellow racers though. He runs 40's. J. J. __________________ www.patooyee.com Build thread Last edited by patooyee; 10-19-2009 at 07:19 PM.

10-19-2009, 07:19 PM	#7
DOUG38S Registered User Join Date: Feb 2003 Member # 17107 Location: Emmitsburg, MD Posts: 3,813	5.13's/2.5 first/3.0 atlas 2500 stall. whatever numbers it works out to be. never did it. goes pretty good. __________________ Doug Bigelow IronClad Energy, Mopar Super Center, Appalachian Offroad, Maxxis, Bulldog Winch, Raceline, PSC, Custom Aluminum Radiators, FOA, Yukon Axle, Tom Woods, PRP, Baja Designs, Stage 8, Everlast Welders, Powertank, Air Dominion LLC, Rock Racing Batteries Code: http://www.accessarmy.com

10-19-2009, 07:33 PM	#9
blacksheep10 Stuff Strutter Join Date: Jan 2004 Member # 26443 Location: Paola, KS, dreaming of Alabama wheelin Posts: 2,968	tires play into it. You need more gearing to feel the same with 42's then with 37's. That said mid to upper 30's with 40" tires. This is speaking to xrra type stuff/rock bouncing. I think Randy at jimmy's says around 42:1. I'm goint to be about 38:1 in mid like doug __________________ Triple Nickel Racing Team #555 Kelly Kaiser Vertical Limits Inc 913.731.3040 paypal: verticallimitsinc@excite.com Your ORI struts dealer!

10-22-2009, 04:03 PM	#10
HammerdownJustin Registered User Join Date: Jan 2008 Member # 106812 Posts: 149	Thx for all the info..I am looking at 727/dana 300/ 5.13 gears.Was hoping the mid 30's would be good.Also going with a 37 or a 39 not sure yet.

10-22-2009, 04:25 PM	#11
onetoncv Pirate4x4 Addict! Join Date: Nov 2000 Member # 2160 Location: Paradise , ca Posts: 7,151	I like doug's #'s- Jess __________________ http://highangledriveline.com Bringing Innovation to the market ! http://highangledriveline.com/HAD1.gif 530-877-2875 -------------------------------------------------------------------------------- When we fear our Government its called tyranny ,And when our Government fears us its called Freedom.

10-22-2009, 09:42 PM	#12
Bigrockbronc Wheeler Join Date: May 2004 Member # 30887 Location: Canon City, CO Posts: 499	I'm currently 31:1, and it feels great for racing. I do notice when slow crawling that it's pretty high. I used to be 43:1 and I think the rig is faster now with the higher gearing. Before, the 1st gear rapped so quick, i lost time between the 1-2 shift. Now, 1st can hold longer and pulls harder. Tranny is a 4l60E (3.06 1st i believe) and the t-case is a np205 with 5.13 r&p. If i were building a multi-purpose rig, i think a 3 or 4spd case would be the ticket, that way you have more control in the slow rocks but have the mid range for the speedy stuff. I guess it depends on what you will be doing with your rig. If only racing, mid 30's would be great. But if you wanna crawl some, like rec wheeling, deeper would def be better. I got plenty of motor to overcome, but it's real jumpy in the rocks. __________________ Xrra Team #720 Mayhem Motorsports Sponsors- Heiseroil.com, InnerAirLock.com, Drivetrain Specialists, Adventure Productions 13th place, XRRA Western Division 2008 2008 Homebuilt tube chassis-2004 LQ9, 4l60e NP205, Dana 70's, 40" Toyo's.

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