[shirk]

Okay engine guru's how can I get some more low end torque out of the Pat.

Mine is a 4x4 5sp FDI.

I don't want high rev horsepower, I want to gain some low rev torque.

What are the options?

 

[heckler]

Google's all I got for you.

 

[heckler]

maybe try the Caliber SRT4 forums?

 

[heckler]

an interesting read, which :lol: points to using a CVT transmission at a constant rpm to maximize torque

 

[heckler]

Some details on your 2.4L

I think changing the gear ratios (good luck with that) is the most likely solution.

 

[heckler]

smaller tires would increase the torque.

yeah, I know, I'm not helping much here.

 

[tiptronic]

Live in UK/ Europe & get a Diesel---Yea that wasnt much help Either !!!

 

[prank213]

add headers and a full exhaust system... that gives you more lower torqe hp

 

[heckler]

http://www.thermaltechcoatings.com/

here's a semi-viable option that I've looked into for thermal protection at high temperatures.

 

[jepstr67]

Good luck with that. I'm really starting to hate the lack of torque out of the Patriot.

What I want is a 6 speed transmission with a super low granny gear. The manual version of FD2.

If you want torque you have to go back to AMC I6 engines.

 

[JeepFan]

The software programming of the spark advance and valve timing allows for more torque, especially when using high octane fuel, in the FDII in off-road mode (4x4 engaged in low gear). I have not seen any numbers as to how much.

This aggressive engine tuning is somewhat limited by the anti-ping sensors which is why the the owner's manual suggests using high octane for off-road use.

I don't know if the same aggressive engine tuning is done in the FDI. You might look in the owners manual to see if it gives the same high octane hint.

 

[Tony1911]

an interesting read, which :lol: points to using a CVT transmission at a constant rpm to maximize torque

Eh, you still have to run the engine at a high RPM to get to the torque. Slight problem at least when off-roading...

I think changing the gear ratios (good luck with that) is the most likely solution.

Shouldn't it be quite possible to swap differential gears with the FDII ones? No clue as to the cost, though...

I don't know if the same aggressive engine tuning is done in the FDI. You might look in the owners manual to see if it gives the same high octane hint.

The manual does not always do a good job of differentiating between FDI and FDII. That said, at least I was under the impression that this engine tuning only takes place when the gear selector is in "L".

 

[APT]

There is nothing on the market to noticeably improve engine power below 3000rpm for this engine. For low speed off roading you need shorter gearing which affects highway cruising.

 

[RHill]

Unfortunately, there is no free lunch. I'm afraid that what you see is what you get. FDII is needed for low speed crawling and towing (in 2009). I choose the 5MT FDI because I wanted my compromises to favor fuel mileage. An exhaust header would provide a small increase in torque under 2500 RPM, but I don't think much.

When I bought it, if I wanted to be able to tow more or have more power, I would have gone for the 6MT Liberty with the 3.7 liter V6, with probably 30-40% higher gas bill.

More torque can be found with the 3.7 liter Liberty with Command Trac two speed transfer case. But, the Liberty weighs a bunch more than the Patriot and the mileage is a bunch lower.

In terms of the vehicle pounds per liter of engine

My Patriot FDI = 3350/2.4 = 1395
Liberty 4X4 = 4200/3.7 = 1135
My 1987 Cherokee 2WD = 2950/4.0 = 737

My 1987 5MT 4.0 liter 2WD Jeep Cherokee weighed 400 pounds less than my Patriot with 67% more cubic inches. But, no antiskid brakes, air bags, or traction control. And, I am getting 40% better fuel mileage with my Patriot.

I believe we have a light duty fuel efficient compact station wagon with good ground clearance and traction systems. It's not a 4.0L Jeep Cherokee. But I am getting 40% better fuel mileage than my Cherokee. And the active traction control is better than my Cherokee. With the 2008 tow prep package, I can tow up to 2000 pounds. I am quite happy with my Patriot.

FWIW and YMMV.