carlotpilot Posted April 23, 2015 Share Posted April 23, 2015 truck with 2150 rpm eng 13spd od trans lp22.5 tires 2.93 rockwell rears.assuming the od trans is pretty much the standard ratio what should the road speed at 2150 in od be? Quote Link to comment https://www.bigmacktrucks.com/topic/39778-solve-an-arguement/ Share on other sites More sharing options...
fifth wheel Posted April 23, 2015 Share Posted April 23, 2015 118+-FW Quote Link to comment https://www.bigmacktrucks.com/topic/39778-solve-an-arguement/#findComment-287621 Share on other sites More sharing options...
j hancock Posted April 23, 2015 Share Posted April 23, 2015 100-105 mph using .78 over with a 38-39 inch tire variable. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/39778-solve-an-arguement/#findComment-287622 Share on other sites More sharing options...
Dirtymilkman Posted April 23, 2015 Share Posted April 23, 2015 Thats set up to run Quote Link to comment https://www.bigmacktrucks.com/topic/39778-solve-an-arguement/#findComment-287650 Share on other sites More sharing options...
Ezrider Posted April 23, 2015 Share Posted April 23, 2015 i came up with 115.8 mph2150 rpmusing .73:1 transmision ratio2.93 rear end ratioand 19.2 as the loaded tire radius witch is what i came up with on a online search for 11r22.5'sused this online cacluator found threw a quick internet searchhttp://wahiduddin.net/calc/calc_speed_rpm.htm Quote Link to comment https://www.bigmacktrucks.com/topic/39778-solve-an-arguement/#findComment-287653 Share on other sites More sharing options...
carlotpilot Posted April 24, 2015 Author Share Posted April 24, 2015 Thats set up to runyup Quote Link to comment https://www.bigmacktrucks.com/topic/39778-solve-an-arguement/#findComment-287679 Share on other sites More sharing options...
carlotpilot Posted April 24, 2015 Author Share Posted April 24, 2015 i came up with 115.8 mph2150 rpmusing .73:1 transmision ratio2.93 rear end ratioand 19.2 as the loaded tire radius witch is what i came up with on a online search for 11r22.5'sused this online cacluator found threw a quick internet searchhttp://wahiduddin.net/calc/calc_speed_rpm.htmthink this one is right i don`t know exactly what my over ratio is but i gave up at 1950-60 Quote Link to comment https://www.bigmacktrucks.com/topic/39778-solve-an-arguement/#findComment-287680 Share on other sites More sharing options...
mack mhe9 Posted April 24, 2015 Share Posted April 24, 2015 Yes but running in 11th or direct at 60 mph you should be just under 1500 rpm. You should get killer fuel milage. Drive correctly of course. Quote Link to comment https://www.bigmacktrucks.com/topic/39778-solve-an-arguement/#findComment-287685 Share on other sites More sharing options...
Mikesbucketlistmack Posted April 26, 2015 Share Posted April 26, 2015 Wow, I wish mine was like that. I get a top speed of 53 MPH in the top 6th gear (overdrive) at 2100 RPM ! Quote Link to comment https://www.bigmacktrucks.com/topic/39778-solve-an-arguement/#findComment-287980 Share on other sites More sharing options...
carlotpilot Posted April 26, 2015 Author Share Posted April 26, 2015 Wow, I wish mine was like that. I get a top speed of 53 MPH in the top 6th gear (overdrive) at 2100 RPM !its really quite useless unless you like high speed driving awards. i`d like a little more than 53 though Quote Link to comment https://www.bigmacktrucks.com/topic/39778-solve-an-arguement/#findComment-287984 Share on other sites More sharing options...
slpwlker Posted April 27, 2015 Share Posted April 27, 2015 the ratio more then likely a direct or not a long legged od. Had an old swift truck I drove the boss took the lopro 22's off and put tall 24.5's the 13 wasn't direct but was an .86 od. to long a leg for it's own good. 90 bobtail flat out. Not due to reaching the top gear it didn't have enough ass to get past that Quote Link to comment https://www.bigmacktrucks.com/topic/39778-solve-an-arguement/#findComment-288006 Share on other sites More sharing options...
bts-4120 Posted April 27, 2015 Share Posted April 27, 2015 that tall of gearing you probley run out of motor before you do rpm's in the high hole and you will run out of clutch and drive shafts trying to get a load moving out of a field road 1 Quote Link to comment https://www.bigmacktrucks.com/topic/39778-solve-an-arguement/#findComment-288010 Share on other sites More sharing options...
carlotpilot Posted April 27, 2015 Author Share Posted April 27, 2015 that tall of gearing you probley run out of motor before you do rpm's in the high hole and you will run out of clutch and drive shafts trying to get a load moving out of a field roadtrue on all counts must be very careful where you go with this thing 440 cat will wring a shaft in a heartbeat especialy backing up a grade cc Quote Link to comment https://www.bigmacktrucks.com/topic/39778-solve-an-arguement/#findComment-288032 Share on other sites More sharing options...
Freightrain Posted April 30, 2015 Share Posted April 30, 2015 My B model has enough gear for 85 mph. Only way it will get there is off a cliff I have had it near 80 bobtail once.......on a few miles of level ground. Any kind of grade and it slows it right back down. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/39778-solve-an-arguement/#findComment-288329 Share on other sites More sharing options...
mack mhe9 Posted May 4, 2015 Share Posted May 4, 2015 My 01 pete 550 cat 18spd 3.25 rears would go 108. Quote Link to comment https://www.bigmacktrucks.com/topic/39778-solve-an-arguement/#findComment-288775 Share on other sites More sharing options...
Mikesbucketlistmack Posted May 5, 2015 Share Posted May 5, 2015 its really quite useless unless you like high speed driving awards. i`d like a little more than 53 though Yeah, it used to be a municipal truck that never went out on the highway so they probably didn't need the speed. Quote Link to comment https://www.bigmacktrucks.com/topic/39778-solve-an-arguement/#findComment-288810 Share on other sites More sharing options...
carlotpilot Posted May 5, 2015 Author Share Posted May 5, 2015 I have turned this thing loose only once` one night in nevada I decided to see where it would go so on one long straight run with a little downgrade to it I ran the 90 mph,speedo.out of numbers and to a straight down position where it stuck` had to replace the speedo head when I got to vegas . from all the answers i have gotten here I think the( doubting thomas) is convinced that it will get into triple digits thanks for all the comments guys. Quote Link to comment https://www.bigmacktrucks.com/topic/39778-solve-an-arguement/#findComment-288813 Share on other sites More sharing options...
carlotpilot Posted May 5, 2015 Author Share Posted May 5, 2015 I have turned this thing loose only once` one night in nevada I decided to see where it would go so on one long straight run with a little downgrade to it I ran the 90 mph,speedo.out of numbers and to a straight down position where it stuck` had to replace the speedo head when I got to vegas . from all the answers i have gotten here I think the( doubting thomas) is convinced that it will get into triple digits thanks for all the comments guys. Quote Link to comment https://www.bigmacktrucks.com/topic/39778-solve-an-arguement/#findComment-288814 Share on other sites More sharing options...
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