Go Back   Jeep Garage - Jeep Forum > Modifications & Enhancements > Performance Modifications

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 02-21-2014, 12:52 PM
Member
My Jeep: 2007 4.7L XK
 
Join Date: Sep 2012
Location: Waterford, MI
Posts: 30
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 700
carvinbassplyr is on a distinguished road
Hypertech rev limiter adjustment

Just wondering if people have any guidelines to a safe range of adjustability? I have a flex fuel 4.7, CIA, 255/65/17 tires and cat-back. Does anyone know what the factory rev limiter is set at? What are folks setting theirs at?
__________________

__________________
Reply With Quote
  #2  
Old 02-21-2014, 10:53 PM
Member
My Jeep: 2007 4.7L XK
 
Join Date: Sep 2012
Location: Waterford, MI
Posts: 30
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 700
carvinbassplyr is on a distinguished road
Does no one at least know where the factory limiter is set? I know that these motors make their peak power btwn 4800-5000 rpm's so by knowing the stock rev limit I can try to manipulate it in the right direction (up or down) to help keep the motor in the sweet spot through all the gears.
__________________

__________________
Reply With Quote
  #3  
Old 02-21-2014, 11:59 PM
Strongjeff's Avatar
Project Six Shooter
My Jeep: 2008 3.7L WK
 
Join Date: Sep 2012
Location: Songwon, South Korea
Posts: 4,010
Thanks: 86
Thanked 136 Times in 131 Posts
Rep Power: 10594
Strongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond repute
Garage
Re: Hypertech rev limiter adjustment

I believe its 6k as it was on my 3.7 same engine yours just has 2 more cylinders
__________________
2008 JGC, Grey Stone Metallic SRT-6
MODS-http://www.jeepgarage.org/f5/project-six-shooter-build-thread-68955.html
Reply With Quote
  #4  
Old 02-22-2014, 12:00 AM
Strongjeff's Avatar
Project Six Shooter
My Jeep: 2008 3.7L WK
 
Join Date: Sep 2012
Location: Songwon, South Korea
Posts: 4,010
Thanks: 86
Thanked 136 Times in 131 Posts
Rep Power: 10594
Strongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond repute
Garage
Re: Hypertech rev limiter adjustment

I bumped it 6250
__________________
2008 JGC, Grey Stone Metallic SRT-6
MODS-http://www.jeepgarage.org/f5/project-six-shooter-build-thread-68955.html
Reply With Quote
  #5  
Old 02-22-2014, 07:48 AM
Member
My Jeep: 2007 4.7L XK
 
Join Date: Sep 2012
Location: Waterford, MI
Posts: 30
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 700
carvinbassplyr is on a distinguished road
Quote:
Originally Posted by Strongjeff View Post
I bumped it 6250
The 3.7 makes it's peak power higher up in the rpm range (5200) and smaller motors can usually handle higher rpm's better. With the 4.7 making peak power @ 4500 rpm's, I don't see the need to go much past 5000 since you're losing power at that point. That's why I need to know where the stock rev limit is so I can know how much to bump it up or down to help keep it in the sweet spot.
__________________
Reply With Quote
  #6  
Old 02-22-2014, 07:54 AM
Strongjeff's Avatar
Project Six Shooter
My Jeep: 2008 3.7L WK
 
Join Date: Sep 2012
Location: Songwon, South Korea
Posts: 4,010
Thanks: 86
Thanked 136 Times in 131 Posts
Rep Power: 10594
Strongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond repute
Garage
Quote:
Originally Posted by carvinbassplyr View Post

The 3.7 makes it's peak power higher up in the rpm range (5200) and smaller motors can usually handle higher rpm's better. With the 4.7 making peak power @ 4500 rpm's, I don't see the need to go much past 5000 since you're losing power at that point. That's why I need to know where the stock rev limit is so I can know how much to bump it up or down to help keep it in the sweet spot.
Its 6k like the 3.7. Its the same
__________________
2008 JGC, Grey Stone Metallic SRT-6
MODS-http://www.jeepgarage.org/f5/project-six-shooter-build-thread-68955.html
Reply With Quote
  #7  
Old 02-22-2014, 09:11 AM
Hitchhiking
My Jeep: 2008 6.1L SRT8
 
Join Date: Nov 2011
Location: middleburg fl
Posts: 909
Thanks: 0
Thanked 10 Times in 10 Posts
Rep Power: 0
kennzz05 has a reputation beyond reputekennzz05 has a reputation beyond reputekennzz05 has a reputation beyond reputekennzz05 has a reputation beyond reputekennzz05 has a reputation beyond reputekennzz05 has a reputation beyond reputekennzz05 has a reputation beyond reputekennzz05 has a reputation beyond reputekennzz05 has a reputation beyond reputekennzz05 has a reputation beyond reputekennzz05 has a reputation beyond repute
Re: Hypertech rev limiter adjustment

unless youre racing then why bother,doubt youll notice any difference

but to find out what its limited at, get it in third and hold it on the floor till its starts bouncing off the limiter
from a brief search looks like peak torque is at 3800 and redline is 5800 to 6000
__________________
Reply With Quote
  #8  
Old 02-22-2014, 02:01 PM
Member
My Jeep: 2007 4.7L XK
 
Join Date: Sep 2012
Location: Waterford, MI
Posts: 30
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 700
carvinbassplyr is on a distinguished road
Quote:
Originally Posted by kennzz05 View Post
unless youre racing then why bother,doubt youll notice any difference

but to find out what its limited at, get it in third and hold it on the floor till its starts bouncing off the limiter
from a brief search looks like peak torque is at 3800 and redline is 5800 to 6000
What drew my attention toward the rev limiter (b4 even having a programmer) was how the motor was rev'ing when merging onto express ways. I noticed, on more than one occasion, that when I had to get up to speed fast the motor was rev'ing out farther than what even seemed safe before finally down-shifting. Having a rev limiter set @ 6k on a motor that makes full power @ 4.5k doesn't seem logical. You're putting more stress on parts without gaining anything. Maybe when I do the 2008+ intake mani swap I'll let the motor rev out a little farther since that manifold flows well beyond 6k, but until then I'm trying to milk the motor's stock sweet spot.
__________________
Reply With Quote
  #9  
Old 02-24-2014, 03:30 AM
Hitchhiking
My Jeep: 2008 6.1L SRT8
 
Join Date: Nov 2011
Location: middleburg fl
Posts: 909
Thanks: 0
Thanked 10 Times in 10 Posts
Rep Power: 0
kennzz05 has a reputation beyond reputekennzz05 has a reputation beyond reputekennzz05 has a reputation beyond reputekennzz05 has a reputation beyond reputekennzz05 has a reputation beyond reputekennzz05 has a reputation beyond reputekennzz05 has a reputation beyond reputekennzz05 has a reputation beyond reputekennzz05 has a reputation beyond reputekennzz05 has a reputation beyond reputekennzz05 has a reputation beyond repute
Re: Hypertech rev limiter adjustment

you could shift it manually, not a solution but a suggestion
__________________
Reply With Quote
  #10  
Old 02-24-2014, 03:51 AM
Strongjeff's Avatar
Project Six Shooter
My Jeep: 2008 3.7L WK
 
Join Date: Sep 2012
Location: Songwon, South Korea
Posts: 4,010
Thanks: 86
Thanked 136 Times in 131 Posts
Rep Power: 10594
Strongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond repute
Garage
Re: Hypertech rev limiter adjustment

Quote:
Originally Posted by carvinbassplyr View Post
What drew my attention toward the rev limiter (b4 even having a programmer) was how the motor was rev'ing when merging onto express ways. I noticed, on more than one occasion, that when I had to get up to speed fast the motor was rev'ing out farther than what even seemed safe before finally down-shifting. Having a rev limiter set @ 6k on a motor that makes full power @ 4.5k doesn't seem logical. You're putting more stress on parts without gaining anything. Maybe when I do the 2008+ intake mani swap I'll let the motor rev out a little farther since that manifold flows well beyond 6k, but until then I'm trying to milk the motor's stock sweet spot.
then I would drop it down to about 5,7k that way when it shifts you land deeper in the power band. I shift at 6k cuz when it hits the net gear around 3800-4200 im in the sweat spot for torque and then it builds into the peak horsepower range. Granted I have the 3.7 and the 4.7 is not all that different, the power curves are similar when stock. now with all my mods it pulls from 3k all the way to 5800
__________________
2008 JGC, Grey Stone Metallic SRT-6
MODS-http://www.jeepgarage.org/f5/project-six-shooter-build-thread-68955.html
Reply With Quote
  #11  
Old 02-24-2014, 09:07 AM
Member
My Jeep: 2007 4.7L XK
 
Join Date: Sep 2012
Location: Waterford, MI
Posts: 30
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 700
carvinbassplyr is on a distinguished road
Quote:
Originally Posted by Strongjeff View Post

then I would drop it down to about 5,7k that way when it shifts you land deeper in the power band. I shift at 6k cuz when it hits the net gear around 3800-4200 im in the sweat spot for torque and then it builds into the peak horsepower range. Granted I have the 3.7 and the 4.7 is not all that different, the power curves are similar when stock. now with all my mods it pulls from 3k all the way to 5800
I set it @ 5500 for now. We'll see how that feels through the gears.
__________________

__________________
Reply With Quote
Reply

Thread Tools
Display Modes

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Hypertech Interceptor LaserMan Grand Cherokee SRT - WK2 18 01-02-2014 07:13 PM
Safe rev limiter Stickerbombed Grand Cherokee - WK 2 11-11-2012 11:36 PM
Speed limiter ?? Eric67 Grand Cherokee - WK2 - 6 09-04-2011 03:46 PM
Hypertech vs dynojet trebliw Performance Modifications 4 12-22-2010 07:57 AM
Rev Limiter trebliw Grand Cherokee - WK 10 12-12-2010 02:35 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 08:49 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community