Lack of power on new 2016 JK - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > JK Jeep Wrangler Forum > JK Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 11-30-2015, 07:17 PM
Thread Starter
  #1
Newb
 
Join Date: Nov 2015
Posts: 4
Angry Lack of power on new 2016 JK

So the wife wanted a new jeep and I bought it for her. We test drove it and she liked it even with the manual trans. Before we took the jeep off the lot she had a lift and 35's put on it. When I got to drive it for the first time I noticed it had no power what so ever. It could not hold 75mph while cruise control was on. I noticed that if I put the throttle to the firewall the speedometer actually lowered. I never knew this 3.6L engine was so gutless. Is there anything that can be done to improve power and throttle response? Thanks for the help.

mastergunner is offline   Quote
Old 11-30-2015, 07:24 PM   #2
Jeeper
 
KOKO1's Avatar
 
Join Date: Sep 2015
Posts: 238
What gears? If 3.21 that is probably the issue. Also get a procal or similar to change the tire size if not already done. Also may want to try the pedal trick. Can't remember the specifics but someone may.

KOKO1 is offline   Quote
Old 11-30-2015, 07:34 PM   #3
Supporting Member

WF Supporting Member
 
RoadiJeff's Avatar
 
Join Date: Dec 2012
Location: St. Louis, MO
Posts: 6,891
Copied from another thread:

Quote:
Throttle calibration can substantially improve throttle responsiveness over "factory standard." Many people notice what appears to be sluggish throttle response or a "dead area" at initial accelerator depression. Throttle calibration can take care of these.
1) Insert ignition key and turn to "ON" (not start).
2) Wait for all idiot lights to go out. Check Engine Light may remain on.
3) Slowly depress the accelerator pedal all the way to the floor.
4) Slowly release the accelerator pedal until it's all the way back up.
5) Turn the ignition key to "OFF".
6) Start the engine.
Most drivers notice an immediate change in throttle response, but depending on your driving style, you may need to repeat this procedure periodically due to the computer's adaptive programming. You likely need to repeat this procedure any time the battery is disconnected.
RoadiJeff is online now   Quote
Sponsored Links
Advertisement
 
Old 11-30-2015, 08:34 PM   #4
Jeeper
 
Join Date: Jun 2013
Location: SE Michigan
Posts: 1,401
I'm guessing that the dealer didn't re-gear the axles for the larger tire size.
__________________
2013 Wrangler Sport (2DR) | Stick Shift | 4.10 Gears | TrueTrac LSD Front & Rear
33x12.5x15 Duratracs on 15x8 Black Rock D-Window Wheels
Prodigy Performance Stage 2 Turbo
AEV 2" Spacer Lift
Full Disclosure: Affiliated with Prodigy Performance as of 3/10/16 (explanation)
This is my personal account. My statements/opinions are my own; not Prodigy's
UselessPickles is offline   Quote
Old 11-30-2015, 08:40 PM   #5
Jeeper
 
JTPhoto JK's Avatar
 
Join Date: Jun 2011
Location: Thunder Bay ON Canada
Posts: 5,129
It needs a regear.
__________________
Jeff _(OIIIO)_

2018 Rhino Rubicon 35s for now.

08 Black and Khaki JK Sahara Unlimited (GONE) My BRUTUS BUILD
JTPhoto JK is offline   Quote
Old 11-30-2015, 08:42 PM   #6
Wrangler Forum Crew

WF Lifetime Member
::WF Moderator::
 
Blue Baby Sound's Avatar
 
Join Date: Jan 2014
Location: Glenpool, OK (Tulsa)
Posts: 15,353
Quote:
Originally Posted by mastergunner View Post
So the wife wanted a new jeep and I bought it for her. We test drove it and she liked it even with the manual trans. Before we took the jeep off the lot she had a lift and 35's put on it. When I got to drive it for the first time I noticed it had no power what so ever. It could not hold 75mph while cruise control was on. I noticed that if I put the throttle to the firewall the speedometer actually lowered. I never knew this 3.6L engine was so gutless. Is there anything that can be done to improve power and throttle response? Thanks for the help.
Like the others have said, likely the Jeep was not geared for the larger/heavier tires. 4.56 is usually a good choice for 35s.
Also make sure the computer is flashed for the new tire size.

Good luck
__________________
HERS-2018 JK- Gobi- (WOOKIEE) Build Thread
HIS- 2014 JKUR- Copperhead Pearl (BRUTUS) Build Thread
Retired 2016 JKWW- Firecracker Red (MAXIMUS)
Retired 2013 JKUS- White- (THOR)
Blue Baby Sound is offline   Quote
Old 11-30-2015, 09:25 PM   #7
Jeeper
 
Tweak's Avatar
 
Join Date: Jan 2013
Location: Whidbey Island, WA
Posts: 6,202
Puts 35's on a jeep

Doesnt use proper gears

complains that the motor has no balls

Yep thats what happened in this thread!
__________________
Billet 2013 2 door
Dana 60 front, 14 Bolt rear, ARB's, 5.38's, 35 spline Yukon shafts, Reid Knuckles, 40" Comp Trepadors, 3 link front, triangulated 4 link rear, 14" coilovers front and rear, Tom Woods 1310 front, Adams 1350 rear, PSC Hydro assist, SuperWinch 9500,
https://www.wranglerforum.com/f314/t...ad-272841.html
Tweak is offline   Quote
Old 12-01-2015, 06:42 AM   #8
TOK
Jeeper
 
TOK's Avatar
 
Join Date: Mar 2013
Posts: 1,424
There is a lot in play here... The fact that it probably has 3.21 gears has already been mentioned. A lot of people (me included) have noticed the Pentastar "wakes up" somewhere north of 2,000 miles.

Not sure if its a programmed break in thing, or just that they are tight engines from the factory but there are threads covering this.

If you're comparing to a V8 pickup or something else with a lot of torque, the Pentastar is still going to feel like a little bit of a letdown. I have a 6 speed with 315 Duratracs (one of the lightest 35 sized tires) and 3.73 gears and it still falls flat on its face in hilly terrain if you goose it below about 2500rpm.

Like others said, I think a re-gear is in your future but just wanted to throw out my own experiences with a similar setup for you to consider.
TOK is offline   Quote
Old 12-01-2015, 07:00 AM   #9
Jeeper
 
Bailey15's Avatar
 
Join Date: Nov 2015
Location: Fort Bliss, TX
Posts: 74
Also your not going to get ANY power from 6th gear, best advice i got is shift down and get back up to speed and drive on my friend
Bailey15 is offline   Quote
Old 12-01-2015, 07:20 AM   #10
kik
Jeeper
 
kik's Avatar
 
Join Date: Dec 2008
Posts: 8,968
Quote:
Originally Posted by mastergunner View Post
So the wife wanted a new jeep and I bought it for her. We test drove it and she liked it even with the manual trans. Before we took the jeep off the lot she had a lift and 35's put on it. When I got to drive it for the first time I noticed it had no power what so ever. It could not hold 75mph while cruise control was on. I noticed that if I put the throttle to the firewall the speedometer actually lowered. I never knew this 3.6L engine was so gutless. Is there anything that can be done to improve power and throttle response? Thanks for the help.
Yes. Like others mentioned, you most likely have 3.21's that's why in 6th and in cruise it won't hold. You can have it re-geared, or if you prefer not to re-gear use 5th and maybe 4th. The 3.6 isn't a gutless engine at all, the proper gearing should be used with JK's when other than stock lifts/tires are added. If you drove a JK with a 3.8 like mine you would be impressed with your 3.6. Gearing is even more critical with a 3.8. Good luck with your new JK.
kik is offline   Quote
Old 12-01-2015, 07:53 AM   #11
Jeeper
 
derf's Avatar
 
Join Date: Oct 2012
Location: Littleton, CO
Posts: 3,428
This is why your Jeep seems gutless in 6th gear.

http://www.grimmjeeper.com/regearing_basics.html

I run 4.56 gears with my 35s and only have to downshift when I am going up a steep grade.
__________________
2001 XJ - 4.0/AW4/NP242/D44/D44
1991 MJ - 2.5/AX5/D35
1987 MJ - 4.0/BA10-5/D35
1986 J10 - 401/700R4/NP208/D44HD/D60FF

My gear ratio calculator
derf is offline   Quote
Old 12-01-2015, 08:34 AM   #12
Jeeper
 
Blkfenderslookbetter's Avatar
 
Join Date: Aug 2012
Location: 1 block down from the Bentley dealership in Indiana
Posts: 820
Quote:
Originally Posted by mastergunner View Post
So the wife wanted a new jeep and I bought it for her. We test drove it and she liked it even with the manual trans. Before we took the jeep off the lot she had a lift and 35's put on it. When I got to drive it for the first time I noticed it had no power what so ever. It could not hold 75mph while cruise control was on. I noticed that if I put the throttle to the firewall the speedometer actually lowered. I never knew this 3.6L engine was so gutless. Is there anything that can be done to improve power and throttle response? Thanks for the help.
Classic example of a dealership just taking the order (and your money) with no regard to how it impacts vehicle performance.

This is reason # 1A why it's a bad idea to buy dealer modded Jeeps. The vast majority that I've looked at have this exact issue... 3.21's with a 3" lift and 35" tires. They are simply selling a base model, pimped out to bring max profit. Selling all bling and no zing. I'm sure most of those come back as early trade in's because the owner can't stand to drive it after about the 3rd payment... big loss at trade... big gain at used car lot. What a great business for the dealer.

Buyer beware and educate yourself, or suffer the consequences.
__________________
Bought a Sport, bolted together a Rubicon. Wasn't planned, just happened. I guess it's a Jeep thing.
Blkfenderslookbetter is offline   Quote
Old 12-01-2015, 10:20 AM   #13
Jeeper
 
lolpetewtf's Avatar
 
Join Date: Jan 2012
Location: MA/VA/AZ
Posts: 2,319
Hope you have a few thousand laying around to fix the problem! Do some research next time.
__________________
2012 Cosmos Blue JK
Galaxy DX-99v2/Sirio 5000

S Package/Auto/Dual Top
Custom Stereo/20% Tint
Grabbers on Vision Wheels
lolpetewtf is offline   Quote
Old 12-01-2015, 11:19 AM   #14
Wrangler Forum Crew

WF Lifetime Member
::WF Moderator::
 
Blue Baby Sound's Avatar
 
Join Date: Jan 2014
Location: Glenpool, OK (Tulsa)
Posts: 15,353
And like a thief in the night the OP has disappeared.
__________________
HERS-2018 JK- Gobi- (WOOKIEE) Build Thread
HIS- 2014 JKUR- Copperhead Pearl (BRUTUS) Build Thread
Retired 2016 JKWW- Firecracker Red (MAXIMUS)
Retired 2013 JKUS- White- (THOR)
Blue Baby Sound is offline   Quote
Old 12-01-2015, 11:34 AM   #15
Jeeper
 
ColorowJeep's Avatar
 
Join Date: Sep 2015
Location: Golden, Colorado
Posts: 90
Quote:
Originally Posted by TOK View Post
There is a lot in play here... The fact that it probably has 3.21 gears has already been mentioned. A lot of people (me included) have noticed the Pentastar "wakes up" somewhere north of 2,000 miles.

Not sure if its a programmed break in thing, or just that they are tight engines from the factory but there are threads covering this.

If you're comparing to a V8 pickup or something else with a lot of torque, the Pentastar is still going to feel like a little bit of a letdown. I have a 6 speed with 315 Duratracs (one of the lightest 35 sized tires) and 3.73 gears and it still falls flat on its face in hilly terrain if you goose it below about 2500rpm.

Like others said, I think a re-gear is in your future but just wanted to throw out my own experiences with a similar setup for you to consider.
I don't know if that is true or not...but I must say, I did notice a little performance difference about then as well (now that you mention it TOK). I am at 3200 on my '15 JKUR(manual). I just thought I was learning the shift points better, but I agree that there seemed to be something that "clicked" with it.
ColorowJeep is offline   Quote
Old 12-01-2015, 11:51 AM   #16
Jeeper
 
Greenzilla's Avatar
 
Join Date: Jan 2015
Posts: 81
Quote:
Originally Posted by TOK View Post
A lot of people (me included) have noticed the Pentastar "wakes up" somewhere north of 2,000 miles.
Mine must have been a late bloomer. Just hit 11k and I swear someone installed a different 6 speed and engine sometime in the last 1000 miles. Much smoother to shift and a little more midrange grunt.
Greenzilla is offline   Quote
Old 12-01-2015, 12:30 PM   #17
Jeeper
 
Join Date: Jun 2015
Posts: 257
Quote:
Originally Posted by Blkfenderslookbetter View Post
... pimped out to bring max profit. Selling all bling and no zing.........

I am going to have to remember this saying!
msdeb is offline   Quote
Old 12-01-2015, 12:38 PM   #18
Jeeper
 
mikeinoh's Avatar
 
Join Date: Sep 2013
Posts: 219
The 2016 Jeep Wrangler comes with a 3.6-liter V6 engine that makes 285 horsepower and 260 pound-feet of torque.

Yep, it's not the motor, it's the 3.21s and 35s that do not mix well.
__________________
Opinions expressed herein are my own, period.

2014 JKU Sport w/connectivity...no mods...yet.
mikeinoh is offline   Quote
Old 12-01-2015, 12:44 PM   #19
Jeeper
 
Freedom JK's Avatar
 
Join Date: Oct 2013
Location: Baton Rouge, LA
Posts: 2,555
My 2013 JKU has 33" tires and 3.73 gear ratio and it has plenty of power. I could easily set the cruise at 90 mph or over and it would have no problem at all holding that speed. I have been extremely happy with the 3.6 Pentastar engine.
Freedom JK is offline   Quote
Old 12-01-2015, 01:00 PM   #20
Jeeper
 
Comanche's Avatar
 
Join Date: Sep 2015
Location: FIMA Camp #243
Posts: 484
Well Duh, was my first thought reading the OP thread.
I was looking at a gearing chart and it looks like 35's would be livable with 3.73, but 4.10 would be ideal.
I'm thinking 33's on the stock 17x7 rim with spacers and I should be golden.
__________________
Beer, meat, fire.
Comanche is offline   Quote
Old 12-01-2015, 01:56 PM   #21
Jeeper
 
spinlock's Avatar
 
Join Date: Sep 2013
Location: 37.9° N, 121.7° W
Posts: 5,701
MasterGunner the fact you need to regear has been beaten to death so you get the picture. It's a direct result of the lift kit which significantly increases drag over 55 MPH the larger tires which reduce your final drive ratio and they increase the rotational mass and rolling resistance. All of that adds up to a major power drain at cruising speeds no to mention a noticeable reduction in fuel economy.

However, if you don't want to spend the ~$2000 to regear as the dealer should have but never does, you are fortunate because you have a manual. Just adjust your shifting patterns (stay in each gear a tad longer) and avoid using the top gear as many others in your situation do.
__________________
"Don't take life too seriously. You'll never get out alive."
B. B.
spinlock is offline   Quote
Old 12-01-2015, 02:08 PM   #22
Jeeper
 
ddcha's Avatar
 
Join Date: Jun 2012
Posts: 926
Also, if your speedometer hasn't been reprogrammed, then when you're driving 75mph, you're actually going 82mph.
__________________
2015 Black JKUWW half doors
ddcha is offline   Quote
Old 12-01-2015, 02:33 PM   #23
Jeeper
 
derf's Avatar
 
Join Date: Oct 2012
Location: Littleton, CO
Posts: 3,428
Quote:
Originally Posted by spinlock View Post
MasterGunner the fact you need to regear has been beaten to death so you get the picture. It's a direct result of the lift kit which significantly increases drag over 55 MPH the larger tires which reduce your final drive ratio and they increase the rotational mass and rolling resistance. All of that adds up to a major power drain at cruising speeds no to mention a noticeable reduction in fuel economy.

However, if you don't want to spend the ~$2000 to regear as the dealer should have but never does, you are fortunate because you have a manual. Just adjust your shifting patterns (stay in each gear a tad longer) and avoid using the top gear as many others in your situation do.
The height of the lift has nothing to do with the need to regear. At all. The aerodynamic effects are barely enough to affect the rounding you do when you're figuring out what gears you really want.

Tire size accounts for at least 95% of the decision when choosing gears. The weight and aerodynamics are the reason to always round up.
__________________
2001 XJ - 4.0/AW4/NP242/D44/D44
1991 MJ - 2.5/AX5/D35
1987 MJ - 4.0/BA10-5/D35
1986 J10 - 401/700R4/NP208/D44HD/D60FF

My gear ratio calculator
derf is offline   Quote
Old 12-01-2015, 03:09 PM   #24
Jeeper
 
Join Date: May 2015
Location: Austin, TX
Posts: 766
Quote:
Originally Posted by mikeinoh View Post
The 2016 Jeep Wrangler comes with a 3.6-liter V6 engine that makes 285 horsepower and 260 pound-feet of torque.

Yep, it's not the motor, it's the 3.21s and 35s that do not mix well.
Quote:
Originally Posted by Freedom JK View Post
My 2013 JKU has 33" tires and 3.73 gear ratio and it has plenty of power. I could easily set the cruise at 90 mph or over and it would have no problem at all holding that speed. I have been extremely happy with the 3.6 Pentastar engine.
I was thinking the same thing; I was very pleased the first time I floored my new JKU. The power, torque, and acceleration are reminiscent of so called "muscle cars". I've had vehicles with less HP and Torque but with higher tow ratings even though their wheelbase was comparable so I'm a bit puzzled why a 4600 pound vehicle with almost 300 horsepower and 260 lb/ft of torque is so conservatively rated to only tow 3500 pounds. Check out the new Colorado with a comparable 3.6 and what it's tow ratings are.

Anyway, I put 33x12.5's on mine (3.73 gears) and noticed a slight decrease in performance but nothing to write home about. It still screams giddy-up when I floor it.
__________________
____________________________________
2015 JKUS purchased new with leaky hard top option. Added faulty electrical harness upgrade in 2017.
Austintatious is offline   Quote
Old 12-01-2015, 04:34 PM   #25
Jeeper
 
grizzstang's Avatar
 
Join Date: Aug 2013
Location: Calgary, Alberta Canada
Posts: 844
Quote:
Originally Posted by Tweak View Post
Puts 35's on a jeep

Doesnt use proper gears

complains that the motor has no balls

Yep thats what happened in this thread!
I saw that too. Also has not checked back in since.
__________________
2013 Jeep Wrangler Sahara - White with Black Hard Top - Auto Trans, LSD with 373's, Remote Start, Mopar Hood Lock with Grill Guard, GraBars, VDP Stubby Front Bumper, Daystar Leveling Kit and Griffin Steering Attenuator.
grizzstang is offline   Quote
Old 12-01-2015, 08:35 PM   #26
Jeeper
 
Join Date: Feb 2015
Location: McKinney, TX
Posts: 126
Maybe the OP (mastergunner) is working and can't get back to the forum in 24 hours. Or maybe due to the community, he opted for a different forum.
Just some thoughts to consider.
__________________
2015 JKU Rubicon HR
robrtb is offline   Quote
Old 12-01-2015, 10:10 PM   #27
Supporting Member

WF Supporting Member
 
RoadiJeff's Avatar
 
Join Date: Dec 2012
Location: St. Louis, MO
Posts: 6,891
Mastergunner's profile indicates that he hasn't logged back on since around the time he posted his message. Thus, he has yet to read any of these replies.
RoadiJeff is online now   Quote
Old 12-02-2015, 10:36 AM   #28
Jeeper
 
Freedom JK's Avatar
 
Join Date: Oct 2013
Location: Baton Rouge, LA
Posts: 2,555
Quote:
Originally Posted by Austintatious View Post
I was thinking the same thing; I was very pleased the first time I floored my new JKU. The power, torque, and acceleration are reminiscent of so called "muscle cars". I've had vehicles with less HP and Torque but with higher tow ratings even though their wheelbase was comparable so I'm a bit puzzled why a 4600 pound vehicle with almost 300 horsepower and 260 lb/ft of torque is so conservatively rated to only tow 3500 pounds. Check out the new Colorado with a comparable 3.6 and what it's tow ratings are.

Anyway, I put 33x12.5's on mine (3.73 gears) and noticed a slight decrease in performance but nothing to write home about. It still screams giddy-up when I floor it.
I think the tow rating is low due to the Jeeps wheelbase and handling. Several times a year, I will tow a 10' trailer with a very light load (no more than 200 lbs) and I can feel the trailer moving the Jeep around.
Freedom JK is offline   Quote
Old 12-02-2015, 11:08 AM   #29
Jeeper
 
steve68's Avatar
 
Join Date: Jun 2014
Location: orl FL/chincoteague VA
Posts: 383
Probably traded it,
steve68 is offline   Quote
Old 12-02-2015, 01:13 PM   #30
Jeeper
 
Join Date: Aug 2015
Posts: 997
Yea towing is a chassis/suspension issue. Not a clue if it's the wheelbase or just the springhares and how the suspension is designed.... I think we all known these are designed more for the rubicon trail vs towing a 3500 lb boat or trailer

Funny that someone adds probably 50-75 lbs of unspring weight per corner plus the overall diameter increase and complains about lack of power.

I say add a turbo

NC25T 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






All times are GMT -5. The time now is 03:33 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, Gladiator, Mopar and Grand Cherokee are copyrighted and trademarked to FCA US LLC.
Wranglerforum.com is not in any way associated with FCA US LLC.