Diesel RPM on Highway

thance

Member
Joined
May 12, 2020
Messages
24
Reaction score
11
Location
New Jersey
Vehicle(s)
2010 Commander, 2002 Liberty, Looking for JLURD
For those with the diesel, what is your RPM and gear when cruising on the highway at 80MPH?
Advertisement

 

AdvEddie

Well-Known Member
First Name
Ed
Joined
Feb 28, 2020
Messages
61
Reaction score
47
Location
SF Bay Area
Vehicle(s)
20 JL Rubicon EcoDiesel -15 Ram 2500 Cummins Mega
2k RPM for me.
 
OP
OP

thance

Member
Joined
May 12, 2020
Messages
24
Reaction score
11
Location
New Jersey
Vehicle(s)
2010 Commander, 2002 Liberty, Looking for JLURD
@AdvEddie was that 7 or 8th gear and are you running stock height, tires, Rubicon?
 

AdvEddie

Well-Known Member
First Name
Ed
Joined
Feb 28, 2020
Messages
61
Reaction score
47
Location
SF Bay Area
Vehicle(s)
20 JL Rubicon EcoDiesel -15 Ram 2500 Cummins Mega
I would assume it was top gear, yes. Everything stock on Diesel Rubicon with factory BFG tires.
 
OP
OP

thance

Member
Joined
May 12, 2020
Messages
24
Reaction score
11
Location
New Jersey
Vehicle(s)
2010 Commander, 2002 Liberty, Looking for JLURD
Thanks. For those running 35s or 37s, do you see much difference?
 

BuffaloBill

Well-Known Member
First Name
Bill
Joined
Oct 14, 2019
Messages
282
Reaction score
360
Location
WI
Vehicle(s)
2018 Wrangler, 2014 Ram 1500 EcoDiesel 2020 JLUR Ecodiesel
Thanks. For those running 35s or 37s, do you see much difference?
Granted, my example isn’t using actual tire diameters, but roughly speaking, if a 33” tire-equipped Jeep runs 2000rpm @ 80, then a 35” would run:

(33 x 2000)/35 = 1886

37” ——> 1784
etc.
 
  • Like
Reactions: GtX
OP
OP

thance

Member
Joined
May 12, 2020
Messages
24
Reaction score
11
Location
New Jersey
Vehicle(s)
2010 Commander, 2002 Liberty, Looking for JLURD
That's the math, but does it actually do that or drop into 7th?
 

GtX

Well-Known Member
First Name
David
Joined
Nov 9, 2019
Messages
1,012
Reaction score
1,393
Location
Illinois
Vehicle(s)
2020 JLUR 3.0D
Occupation
Working for the man.
Vehicle Showcase
1
My JLURD goes into, and holds, 8th gear around town. Been using manual recently to keep RPM up some.
 

BuffaloBill

Well-Known Member
First Name
Bill
Joined
Oct 14, 2019
Messages
282
Reaction score
360
Location
WI
Vehicle(s)
2018 Wrangler, 2014 Ram 1500 EcoDiesel 2020 JLUR Ecodiesel
That's the math, but does it actually do that or drop into 7th?
I’ve only got 315/70/17 KO2’s ( that measure about 34 1/2”), but at 60 it holds 8th pretty well. With a Tazer to tweak in the speedometer to agree with gps, the tach shows 1500rpm. With enough headwind and mild grade it will sometimes drop to 7th. I can’t imagine it needing 7th at 80mph. Hopefully other diesel owners will chime in, having sustained that speed on an interstate and can offer first-hand 80mph data.
 

Buttercup 3.0

Well-Known Member
First Name
Shawn
Joined
Oct 22, 2019
Messages
101
Reaction score
190
Location
Texas
Vehicle(s)
2015 JKUR 2012 JK
About 2100-2200 RPM but im on 38s and 4.56 gears and absolutely love it
 

Bravo

Well-Known Member
First Name
Eric
Joined
Nov 7, 2018
Messages
83
Reaction score
82
Location
Meridian, ID
Vehicle(s)
2020 JLUR 3.0, 2016 Dodge Ram 2500 Mega CTD, 2019 Roadglide Special, 2015 Malibu Wakesetter 23 LSV, 2019 Skidoo Summit X 165, and 2018 Skidoo Summit X 154
37’s 8th gear 3.73’s approx 1800 rpm @80 mph
 

MeekoDiesel

Member
First Name
Patrick
Joined
Jun 29, 2020
Messages
24
Reaction score
40
Location
Raleigh, NC
Vehicle(s)
2020 JLURD Sting Gray , 1948 Willys CJ2A , 1976 Chevy C10 , 1998 Honda Civic
Occupation
Nuclear Operations Technician - Shearon Harris Nuclear Station
2k, 80mph, 8th gear. Pulls up grades at that speed in 8th no problem.
 
Advertisement

JKS Manufacturing
 
Advertisement
Top