NCJL
Well-Known Member
- First Name
- Dean
- Joined
- Jul 22, 2021
- Threads
- 36
- Messages
- 358
- Reaction score
- 439
- Location
- New Mexico
- Vehicle(s)
- JLURD
- Build Thread
- Link
- Occupation
- Electrical
- Thread starter
- #1
I think I need a Physics Engineer.
Problem.
Trying to figure out the HP loss when increasing tire size and gear ratios together. Lots of calculators out there when increasing tire size without changing gears.
For example. I re-geared my JT to match a factory JT Sport with EcoDiesel. 3.73 gears with 31” tires.
My JT has 5.13 gears with 42” tires. The RPM’s basically match each other at speed.
How much HP did I lose? I had to lose something.
With all the rolling resistance talk going on. I found calculators showing HP loss when going from all-terrain to mud terrain, up to 5hp using the same size tire.
Can’t find anything addressing the diameter, width and weight change of a tire within the same RPM band.
Thanks.
Problem.
Trying to figure out the HP loss when increasing tire size and gear ratios together. Lots of calculators out there when increasing tire size without changing gears.
For example. I re-geared my JT to match a factory JT Sport with EcoDiesel. 3.73 gears with 31” tires.
My JT has 5.13 gears with 42” tires. The RPM’s basically match each other at speed.
How much HP did I lose? I had to lose something.
With all the rolling resistance talk going on. I found calculators showing HP loss when going from all-terrain to mud terrain, up to 5hp using the same size tire.
Can’t find anything addressing the diameter, width and weight change of a tire within the same RPM band.
Thanks.
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