2,100 RPM, what MPH? - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > JK Jeep Wrangler Forum > JK General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 05-27-2012, 04:47 PM   #1
Jeeper
 
joe002's Avatar
 
Join Date: Nov 2010
Location: Phoenix, AZ
Posts: 1,185
Question 2,100 RPM, what MPH?

I know there are a lot of differences in the automatic/manual, pre-2012/2012+, gears, etc. but I was wondering how fast are you going when your engine is at 2,100 RPM?

__________________
2008 Rubicon, 2 Door, Flame Red, Auto, MyGIG, Power Group, Deep Tint
AEV Pintlers, BFG KM2s 35x12.50x17, Bulldog Fab Rear Stubby Bump, Currie F/R Adj Trac Bars, Daystar Upper Dash, FireStik FireFly Antenna, Kilby Rear Shock Skids, LoD Sig Stubby Front Bump, Midland 75-822 CB, Mopar Filler Door & Locking Gas Cap, Rancho LCA Skid, Rancho Oil Pan Armor, Riddler Diff Covers, TeraFlex 2.5" Spring Lift, Warn PowerPlant HD, Woods Evap Can Relo, Woods SS Relo, Yukon 5.38s
joe002 is offline   Quote
Old 05-27-2012, 04:50 PM   #2
Pm inbox full

WF Supporting Member
::WF Moderator::
 
kjeeper10's Avatar
 
Join Date: Feb 2011
Location: Connecticut
Posts: 42,540
Right now I'm doing 70 at that with 35's in 6th.
Between 2100-2200.

07 w/4.10's 6 speed.

__________________
37x12.5x17 MTR. Rock Krawler 3.5"
Coils, custom length X-Factor arms,Teraflex,Synergy,Rancho 5000X shocks.
My 2007 2 Door Build
General lift discussion thread. Have a question, need help, issues, selecting a kit, ask here
Click HERE to become a WranglerForum Supporting Member!
kjeeper10 is online now   Quote
Old 05-27-2012, 04:56 PM   #3
..shall not be infringed!

WF Supporting Member
 
Up Hill Bill's Avatar
 
Join Date: Jun 2011
Location: Up the hill, CA Northcoast
Posts: 4,666
Play with this:

Gear Ratio Calculator

Set the tranny pull-down menu to Dodge 42RLE, transfer case ratios to 1 and 4, axle ratio to 5.38, tire size to 34.8", and have fun....

My 2012 auto, 3.73, 32" stock tires, is doing about 65 MPH in 5th gear at 2100 RPM.

You should be going about 56 MPH at 2000 RPM according to the calculator... So, just under 60 MPH at about 2,100 RPM....
__________________
2012 JKU Rubicon
Sahara Tan
Auto
3.73


Up Hill Bill
Up Hill Bill is offline   Quote
Old 05-27-2012, 05:05 PM   #4
Jeeper
 
Osage Orange's Avatar
 
Join Date: Jun 2011
Location: Lewistown IL
Posts: 591
I normally try to keep it under 2000 rpm most of the time so I maintain over 20 mpg and avoid tickets, but I'll holla back when I get there!
__________________

2012 Wrangler Sport 2 Door
3.6L, 6 Spd Manual, 3.73 gears, ACE Rock Rails, Maximus-3 Bumper Bar, KC HiLiTES 124 SlimLites, AEV 2" spacer lift, Duratrac 285/70R17s, 17x9 XD Addicts, AEV ProCal, 35% window tint, AntennaX.
Osage Orange is offline   Quote
Old 05-27-2012, 06:27 PM   #5
Jeeper
 
mattjopete's Avatar
 
Join Date: Apr 2012
Location: St. Louis Mo
Posts: 417
At 2100 Im doing about 75 with 3.21s and a 6 speed
__________________
'12 JKU COD MW3 Bright Silver Auto 4.10's
'12 JKU Sahara Deep Cherry Red 6-speed 3.21's - Gone
mattjopete is offline   Quote
Old 05-27-2012, 06:39 PM   #6
Jeeper
 
JIMBOX's Avatar
 
Join Date: Nov 2009
Posts: 9,914
I'm doing about 55 mph in O/D-

JIMBO
__________________
"ya gotta have class"
JIMBOX is offline   Quote
Old 05-27-2012, 07:01 PM   #7
Jeeper
 
WatchThis!'s Avatar
 
Join Date: Jul 2010
Location: East Texas
Posts: 4,444
Images: 3
Quote:
Originally Posted by JIMBOX
I'm doing about 55 mph in O/D-

JIMBO
I hear yah JimBo!! Im right at 50 in 6'th gear.
__________________
I'm here to participate. I didnt come all this way just to watch.

My jeep's thread http://www.wranglerforum.com/f33/che...st-111461.html
WatchThis! is online now   Quote
Old 05-28-2012, 08:38 AM   #8
Jeeper
 
SeaComms's Avatar
 
Join Date: Jan 2011
Location: Noosa, QLD, Australia
Posts: 780
Try this one, I put it together when fiddling one night to see the difference changing diffs would make. It sort of grew from there.

http://seacomms.com.au/files/Diff%20Ratios%20V1.2.xls

Sample of data
Attached Thumbnails
Click image for larger version

Name:	Calculator.jpg
Views:	95
Size:	219.5 KB
ID:	126924  
__________________
Cheers from Downunder, Dave.
2010 Dark Charcoal Pearl 'Renegade' pack (includes dual top options, 17in alloys, side steps etc).
2.5in Flexy springs, Bilstien 5100's, Teraflex rear trackbar bracket, Synergy front and rear sway bar links and front disco kit, Synergy steering damper relocation bracket, AEV front drop brackets, ARB front and rear bar, 10,000lb rope winch, Britax Xray Vision driving lights, GME 3440 UHF radio.
SeaComms is offline   Quote
Old 05-28-2012, 10:27 AM   #9
Jeeper
 
joe002's Avatar
 
Join Date: Nov 2010
Location: Phoenix, AZ
Posts: 1,185
It was a trick question - probably wonít be making any friends for it.

Iíve see the 0-60, MPG, 1/4 mile time, burnout, CAI, how does it look, etc. threads, and have been wondering are we discussing cars or Jeeps? I realize that some (many? most?) have their Jeep as a DD and some of the car type topics (on-road type topics) are important to them. However, it seems like many (most?) of the popular threads and responses here are car type topics (try clicking on Replies or Views threads and see whatís most popular), and with the 2012s it seems to be more so. Iím sure the trend will continue with the 2013s and beyond. On a Jeep forum, why is the first reaction of many to think of the ďcar-nessĒ of the Jeep instead of the ďJeep-nessĒ?

I wonder, if I posted this question years ago or on a CJ/YJ/TJ forum would I have gotten a different response? Ever seen a JK thread here where people were comparing how well their Jeeps could crawl (FYI - itís pretty good at it).

I thought of this topic last month when I was out wheeling and crawling up a rocky hill thatís now probably burnt up (lookup Gladiator Fire near Crown King), and took a picture of my dash - in 4 Low and 1st itís about 3 MPH at 2,100 RPM:
__________________
2008 Rubicon, 2 Door, Flame Red, Auto, MyGIG, Power Group, Deep Tint
AEV Pintlers, BFG KM2s 35x12.50x17, Bulldog Fab Rear Stubby Bump, Currie F/R Adj Trac Bars, Daystar Upper Dash, FireStik FireFly Antenna, Kilby Rear Shock Skids, LoD Sig Stubby Front Bump, Midland 75-822 CB, Mopar Filler Door & Locking Gas Cap, Rancho LCA Skid, Rancho Oil Pan Armor, Riddler Diff Covers, TeraFlex 2.5" Spring Lift, Warn PowerPlant HD, Woods Evap Can Relo, Woods SS Relo, Yukon 5.38s
joe002 is offline   Quote
Old 05-28-2012, 10:48 AM   #10
Jeeper
 
JIMBOX's Avatar
 
Join Date: Nov 2009
Posts: 9,914
Heh Heh, I kinda wondered about your question--

Mine does about 3900rpm in 4lo/1st gear/w unbelievable power/torque--as you know-

We just can't go very fast in 4lo !

JIMBO
__________________
"ya gotta have class"
JIMBOX is offline   Quote
Old 05-28-2012, 11:10 AM   #11
Jeeper
 
joe002's Avatar
 
Join Date: Nov 2010
Location: Phoenix, AZ
Posts: 1,185
Jim- Yeah, when the Jeep is off-road and in 4 low thereís more than enough power and torque, and based on your gearing you can make it crawl really nice. Right, you ainít going fast in 4 Low.
__________________
2008 Rubicon, 2 Door, Flame Red, Auto, MyGIG, Power Group, Deep Tint
AEV Pintlers, BFG KM2s 35x12.50x17, Bulldog Fab Rear Stubby Bump, Currie F/R Adj Trac Bars, Daystar Upper Dash, FireStik FireFly Antenna, Kilby Rear Shock Skids, LoD Sig Stubby Front Bump, Midland 75-822 CB, Mopar Filler Door & Locking Gas Cap, Rancho LCA Skid, Rancho Oil Pan Armor, Riddler Diff Covers, TeraFlex 2.5" Spring Lift, Warn PowerPlant HD, Woods Evap Can Relo, Woods SS Relo, Yukon 5.38s
joe002 is offline   Quote
Old 05-28-2012, 11:13 AM   #12
Jeeper
 
Join Date: Jan 2012
Location: Florida
Posts: 742
2100 rpm

hi, most of the time i like to drive about 65 my jeep feels good at that
speed, however it turns about 1750 rpm at 70 mph, its a 2 door 2012jk,
with 3.21 rear and limited slip, l do get about 25-30 MPGS at 65mph, runs
much better that my 07jk with 3.73 rear that puppy got about 13 mpg.
both were auto with good year 24s factory m/s tires, i never look back,
i lookforward to the 2014 jeep with 6 speed auto and diesel which will get
30+ mpgs all the time. life is good
firehawk is offline   Quote
Old 05-28-2012, 11:17 AM   #13
Jeeper
 
JIMBOX's Avatar
 
Join Date: Nov 2009
Posts: 9,914
Heh Heh, yeah joe and I'll tell ya, there's a phenominal difference in towing that trailer up hills----compared to when I had the 4.10 gears-


Quote:
Originally Posted by joe002 View Post
Jim- Yeah, when the Jeep is off-road and in 4 low thereís more than enough power and torque, and based on your gearing you can make it crawl really nice. Right, you ainít going fast in 4 Low.
It's really too bad so many new jeepers (pre 2012) don't realize the inherent power/torque in that little 3.8L---with just the right gears !!

My JKUR now weighs probably 600 lbs more than it did when I had the stock gears and she handles like a pup (yours)

The never ending story-

JIMBO
__________________
"ya gotta have class"
JIMBOX is offline   Quote
Old 05-28-2012, 01:48 PM   #14
Jeeper
 
Osage Orange's Avatar
 
Join Date: Jun 2011
Location: Lewistown IL
Posts: 591
Quote:
Originally Posted by joe002
I know there are a lot of differences in the automatic/manual, pre-2012/2012+, gears, etc. but I was wondering how fast are you going when your engine is at 2,100 RPM?
Ok, heres mine: 65 mph on the gps, 67 on the speed indicator in 6th gear. Mines a 2012 with 3.73 gears, manual transmission, and 285/70/17 GY DTs fyi.
__________________

2012 Wrangler Sport 2 Door
3.6L, 6 Spd Manual, 3.73 gears, ACE Rock Rails, Maximus-3 Bumper Bar, KC HiLiTES 124 SlimLites, AEV 2" spacer lift, Duratrac 285/70R17s, 17x9 XD Addicts, AEV ProCal, 35% window tint, AntennaX.
Osage Orange is offline   Quote
Old 05-28-2012, 08:22 PM   #15
Pm inbox full

WF Supporting Member
::WF Moderator::
 
kjeeper10's Avatar
 
Join Date: Feb 2011
Location: Connecticut
Posts: 42,540
Crawling in 4 lo dudes
__________________
37x12.5x17 MTR. Rock Krawler 3.5"
Coils, custom length X-Factor arms,Teraflex,Synergy,Rancho 5000X shocks.
My 2007 2 Door Build
General lift discussion thread. Have a question, need help, issues, selecting a kit, ask here
Click HERE to become a WranglerForum Supporting Member!
kjeeper10 is online now   Quote
Old 05-28-2012, 09:13 PM   #16
Jeeper
 
joe002's Avatar
 
Join Date: Nov 2010
Location: Phoenix, AZ
Posts: 1,185
Quote:
Originally Posted by kjeeper10 View Post
Crawling in 4 lo dudes
Sometimes I wonder if some actually read the posts in the middle.
__________________
2008 Rubicon, 2 Door, Flame Red, Auto, MyGIG, Power Group, Deep Tint
AEV Pintlers, BFG KM2s 35x12.50x17, Bulldog Fab Rear Stubby Bump, Currie F/R Adj Trac Bars, Daystar Upper Dash, FireStik FireFly Antenna, Kilby Rear Shock Skids, LoD Sig Stubby Front Bump, Midland 75-822 CB, Mopar Filler Door & Locking Gas Cap, Rancho LCA Skid, Rancho Oil Pan Armor, Riddler Diff Covers, TeraFlex 2.5" Spring Lift, Warn PowerPlant HD, Woods Evap Can Relo, Woods SS Relo, Yukon 5.38s
joe002 is offline   Quote
Old 05-28-2012, 09:17 PM   #17
Pm inbox full

WF Supporting Member
::WF Moderator::
 
kjeeper10's Avatar
 
Join Date: Feb 2011
Location: Connecticut
Posts: 42,540
Quote:
Originally Posted by joe002
Sometimes I wonder if some actually read the posts in the middle.
__________________
37x12.5x17 MTR. Rock Krawler 3.5"
Coils, custom length X-Factor arms,Teraflex,Synergy,Rancho 5000X shocks.
My 2007 2 Door Build
General lift discussion thread. Have a question, need help, issues, selecting a kit, ask here
Click HERE to become a WranglerForum Supporting Member!
kjeeper10 is online now   Quote
Old 05-28-2012, 09:37 PM   #18
Jeeper
 
Osage Orange's Avatar
 
Join Date: Jun 2011
Location: Lewistown IL
Posts: 591
Quote:
Originally Posted by joe002
Sometimes I wonder if some actually read the posts in the middle.
I thought the thread simply took an odd turn at first, ha ha. Ive only had mine in 4 HI so far pulling a trailer on my hilly property, no rpms observed though.
__________________

2012 Wrangler Sport 2 Door
3.6L, 6 Spd Manual, 3.73 gears, ACE Rock Rails, Maximus-3 Bumper Bar, KC HiLiTES 124 SlimLites, AEV 2" spacer lift, Duratrac 285/70R17s, 17x9 XD Addicts, AEV ProCal, 35% window tint, AntennaX.
Osage Orange is offline   Quote
Old 05-28-2012, 09:41 PM   #19
Jeeper
 
joe002's Avatar
 
Join Date: Nov 2010
Location: Phoenix, AZ
Posts: 1,185
Quote:
Originally Posted by Osage Orange View Post
I thought the thread simply took an odd turn at first, ha ha. Ive only had mine in 4 HI so far pulling a trailer on my hilly property, no rpms observed though.
Take that sucker off road, put it in 4 Low and 1st, and check out the power/torque and see how you can crawl over things.
__________________
2008 Rubicon, 2 Door, Flame Red, Auto, MyGIG, Power Group, Deep Tint
AEV Pintlers, BFG KM2s 35x12.50x17, Bulldog Fab Rear Stubby Bump, Currie F/R Adj Trac Bars, Daystar Upper Dash, FireStik FireFly Antenna, Kilby Rear Shock Skids, LoD Sig Stubby Front Bump, Midland 75-822 CB, Mopar Filler Door & Locking Gas Cap, Rancho LCA Skid, Rancho Oil Pan Armor, Riddler Diff Covers, TeraFlex 2.5" Spring Lift, Warn PowerPlant HD, Woods Evap Can Relo, Woods SS Relo, Yukon 5.38s
joe002 is offline   Quote
Old 05-28-2012, 10:29 PM   #20
Jeeper
 
Dylanjwhall's Avatar
 
Join Date: Feb 2011
Location: Philadelphia
Posts: 643
63ish, 2012 6 speed 4.10 gears stock wheels and tires

__________________
2012 Rubicon Silver 2" AEV spacer kit

'71 Firebird

Semper Paratus
Dylanjwhall is offline   Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 01:53 PM.


User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.

Jeepģ, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC