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?
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.
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*The More You Play With It, The Bigger It Gets*
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.
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?
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.....
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.
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*The More You Play With It, The Bigger It Gets*
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.
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- Oscar
2008 Commander 3.7L V6 Mods: OEM tow hitch, OEM 7 pin tow wiring, OEM fog lights, daytime running lamps enabled, 4xGuard Matrix Guard w/Grill Hoop kit, RC 2" lift kit, PIAA 510 ATP aux lights, 245/70 GY Silent Armors, HD Bilstein Struts, JeepinByAl HD UCAs.
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