3.7L performance upgrades... - Jeep Commander Forums: Jeep Commander Forum
Jeep Commander Jeep Commander Header Right
HomeForumGalleryClassifiedsAbout UsAdvertiseContact Us

» Auto Insurance
» Featured Product
Wheel & Tire Center

» Sponsor Links
Go Back   Jeep Commander Forums: Jeep Commander Forum > Jeep Commander Discussion > Performance Modifications > Programmers/Engine Mods

Programmers/Engine Mods Questions or advice about programmers or engine mods? This is the place...

JeepCommander.com is the premier Jeep Commander Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools Display Modes
  #1  
Old 11-08-2010, 11:40 AM
twiz86 twiz86 is offline
Junior Member
Points: 429, Level: 8 Points: 429, Level: 8 Points: 429, Level: 8
Level up: 58% Level up: 58% Level up: 58%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Nov 2010
Posts: 11
3.7L performance upgrades...

does anyone know if the 3.7 in the commander is the same 3.7 in any other jeep? what im trying to get at is there isnt much out there for engine upgrades for the commander. would parts for a wrangler or cheroke 3.7 fit on the commander?
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old 11-08-2010, 04:24 PM
redbulljoker69's Avatar
redbulljoker69 redbulljoker69 is offline
Senior Member
Points: 1,820, Level: 25 Points: 1,820, Level: 25 Points: 1,820, Level: 25
Level up: 20% Level up: 20% Level up: 20%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Mar 2010
Location: chicago
Posts: 242
Send a message via AIM to redbulljoker69 Send a message via Skype™ to redbulljoker69
I'm pretty sure they are different engines. wranglers have 3.8L so its different.
best you can do to 3.7L (i have one as well)
1. Cold air intake.

Programmer chips dont work on 3.7L because the engine is already maxed out with power. as high as it will go.
if you want more power, you have to do either engine upgrade or gear ratio change to a 3.73 like the 4.7Ls. the 3.7L has 3.03 gears.
__________________
*The More You Play With It, The Bigger It Gets*
Reply With Quote
  #3  
Old 11-08-2010, 07:55 PM
powerslave1966's Avatar
powerslave1966 powerslave1966 is offline
Senior Member
Points: 7,410, Level: 57 Points: 7,410, Level: 57 Points: 7,410, Level: 57
Level up: 30% Level up: 30% Level up: 30%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Sep 2009
Location: McAllen, TX.
Posts: 1,124
If you wanna swap the gears for 3.73's you have to do both front and rear axles, right? Are there any even avaliable for the XK front yet???
__________________
2007 3.7 Liter Sport 4X4, Jeep Green, RC 2.5" lift, 265/70/17 Mickey Tompson Baja MTZ, Optima Red Top battery, drop-in K&N air filter.
Reply With Quote
  #4  
Old 11-08-2010, 08:06 PM
redbulljoker69's Avatar
redbulljoker69 redbulljoker69 is offline
Senior Member
Points: 1,820, Level: 25 Points: 1,820, Level: 25 Points: 1,820, Level: 25
Level up: 20% Level up: 20% Level up: 20%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Mar 2010
Location: chicago
Posts: 242
Send a message via AIM to redbulljoker69 Send a message via Skype™ to redbulljoker69
yea both front and back axles. its about $2,000 job. unless you get the gears and do em yourself.
__________________
*The More You Play With It, The Bigger It Gets*
Reply With Quote
  #5  
Old 11-08-2010, 08:42 PM
robby's Avatar
robby robby is offline
Senior Member
Points: 11,816, Level: 71 Points: 11,816, Level: 71 Points: 11,816, Level: 71
Level up: 42% Level up: 42% Level up: 42%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Jun 2008
Location: Desplaines IL.
Posts: 3,262
Well....you are only working with 222 or 223 cubic inches here.
It is close to optimum output for a two valve engine designed more for low rpm torque output.....if I remember correctly, horsepower is at 210.
Not to shabby for its dispacement......I don't know its torque rating but I'll bet it is in the 250 ft lb range.....again, fairly respectable.
More aggressive camshafts could eek out a bit more power but that would occur at a higher RPM.....not very useful in a truck application.
So, what I'm getting at is there isn't a magic bullet that currently exists to make more power and torque without changing the characteristics of the engine.
The lower gears (higher numerically) would provide a bit more 'snap' off the line.
The QT II 3.7's used 3.55's and these could be a direct bolt in with a computer reflash to recognise the gearing.
As far as intake or exaust changes the odds are there would be little change with exception of operation at the last 1000 RPM before redline......there might be a bit of restriction at those high cfm requirements but the butt dyno likely would not be able to feel it.
So, gearing or jack up the radiator cap and slide a V-8 Commander under it are, in my opinion, your only options.

All the 3.7's are the same, whether installed in a Commander or Liberty or Grand Cherokee.
The 3.8, found in the Wrangler, shares nothing with the 3.7.


Rob
Reply With Quote
  #6  
Old 11-08-2010, 08:43 PM
twiz86 twiz86 is offline
Junior Member
Points: 429, Level: 8 Points: 429, Level: 8 Points: 429, Level: 8
Level up: 58% Level up: 58% Level up: 58%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Nov 2010
Posts: 11
so thats around $2000 for the gears and install from shop?
Reply With Quote
  #7  
Old 11-08-2010, 08:53 PM
twiz86 twiz86 is offline
Junior Member
Points: 429, Level: 8 Points: 429, Level: 8 Points: 429, Level: 8
Level up: 58% Level up: 58% Level up: 58%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Nov 2010
Posts: 11
Quote:
Originally Posted by robby View Post
Well....you are only working with 222 or 223 cubic inches here.
It is close to optimum output for a two valve engine designed more for low rpm torque output.....if I remember correctly, horsepower is at 210.
Not to shabby for its dispacement......I don't know its torque rating but I'll bet it is in the 250 ft lb range.....again, fairly respectable.
More aggressive camshafts could eek out a bit more power but that would occur at a higher RPM.....not very useful in a truck application.
So, what I'm getting at is there isn't a magic bullet that currently exists to make more power and torque without changing the characteristics of the engine.
The lower gears (higher numerically) would provide a bit more 'snap' off the line.
The QT II 3.7's used 3.55's and these could be a direct bolt in with a computer reflash to recognise the gearing.
As far as intake or exaust changes the odds are there would be little change with exception of operation at the last 1000 RPM before redline......there might be a bit of restriction at those high cfm requirements but the butt dyno likely would not be able to feel it.
So, gearing or jack up the radiator cap and slide a V-8 Commander under it are, in my opinion, your only options.

All the 3.7's are the same, whether installed in a Commander or Liberty or Grand Cherokee.
The 3.8, found in the Wrangler, shares nothing with the 3.7.


Rob


so anything for the motor that a website says is for libery or cherokee will fit on the commander? i found a site that sold i think refurbished engines and trannys and they have the hemi pieces. how much extra work other than installing tranny and motor would it be to put the hemi in? i noticed that the v-6's have all time 4x4 and the v-8's have the switches to go from 2wd to 4hi and 4lo. anyway of changing that as well?
Reply With Quote
  #8  
Old 11-08-2010, 09:09 PM
robby's Avatar
robby robby is offline
Senior Member
Points: 11,816, Level: 71 Points: 11,816, Level: 71 Points: 11,816, Level: 71
Level up: 42% Level up: 42% Level up: 42%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Jun 2008
Location: Desplaines IL.
Posts: 3,262
Unless you have a really big money bucket and a love for this particular Commander a engine switch would be unwise.
You would create a freak that no longer lines up with its vin numbers, and only you could (maybe) correctly service it.
A engine, transmission, transfer case, gearsets, computer(s) related wiring harnesses.....on and on.....

Bad Ju Ju,
Rob
Reply With Quote
  #9  
Old 11-08-2010, 09:23 PM
redbulljoker69's Avatar
redbulljoker69 redbulljoker69 is offline
Senior Member
Points: 1,820, Level: 25 Points: 1,820, Level: 25 Points: 1,820, Level: 25
Level up: 20% Level up: 20% Level up: 20%
Activity: 0% Activity: 0% Activity: 0%
 
Join Date: Mar 2010
Location: chicago
Posts: 242
Send a message via AIM to redbulljoker69 Send a message via Skype™ to redbulljoker69
i myself wanted a bigger engine. since i have a 3.7L rolling 265/70/17 super swampers. and they are heavy. put in cold air intake. and really..just higher RPM gain. was gonna get new gears, decided, id rather just get a new jeep. so mine is for sale. getting a wrangler 4 door with 35" nitto mud grapplers.
__________________
*The More You Play With It, The Bigger It Gets*
Reply With Quote
  #10  
Old 11-09-2010, 09:13 AM
LuvMyCommander's Avatar
LuvMyCommander LuvMyCommander is offline
Senior Member
Points: 7,179, Level: 56 Points: 7,179, Level: 56 Points: 7,179, Level: 56
Level up: 15% Level up: 15% Level up: 15%
Activity: 85% Activity: 85% Activity: 85%
 
Join Date: Apr 2010
Location: Chicago, IL
Posts: 642
Quote:
Originally Posted by redbulljoker69 View Post
i myself wanted a bigger engine. since i have a 3.7L rolling 265/70/17 super swampers. and they are heavy. put in cold air intake. and really..just higher RPM gain. was gonna get new gears, decided, id rather just get a new jeep. so mine is for sale. getting a wrangler 4 door with 35" nitto mud grapplers.
Decided not to go with a V8 XK afterall? That's actually my next move too. I got a few more years to go before I can sell my XK, I have my eye set on a Rubicon.
__________________
- Oscar

2008 Commander Limited 5.7L HEMI QDII
Mods: Coming soon

My garage: http://www.jeepcommander.com/forums/...ad.php?t=13289

- My Jeep won a war. Your Honda mowed my lawn.
Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Jeep Commander Forums: Jeep Commander Forum > Jeep Commander Discussion > Performance Modifications > Programmers/Engine Mods


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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

Forum Jump

Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 05:59 PM.



Powered by vBulletin®. Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.