Engine Load Question

[Bergy1]

Question for the masses. I'm running an Ultra Gauge on my 2006 Rubicon Auto. Stock gearing and 32" tires. My engine load is usually in the 40% to 50% under normal flat driving. Anything with a hill or putting a lug on the engine it will increase up to 100% very easily.

I also have a 2003 4.0 with 30" and 5 speed that will run typically 20% and will go up under similar conditions, but usually is 25-50% lower on the engine load.

I have a friend with a 2003 Rubicon Auto and 31" tires and his engine load reading will be the same at the 2003 manual.

Any ideas why the "engine load" is so much higher on the 2006 Rubicon?

I know there are a lot of variable that I have looked at: I've switched up Ultra Gauges, MPG is very similar no real differences there, runs good, no misses, spark plugs are good, etc....

Just curious if anyone has any experience with this and has any insight.

Thanks

 

[BlueC]

Any ideas why the "engine load" is so much higher on the 2006 Rubicon?

I'm not familiar with that gauge, since I know it's not reading actual torque output, what is it basing "engine load" off of? Vacuum? Throttle position? Wild-ass-guess?

 

[Juggernaut]

You are under geared with the 06. The load is a Calc based in part on manifold pressure. Your foot is further down on the pedal to maintain the same speed under the conditions with the 06 Auto.

 

[ColoJeep]

I'm not familiar with that gauge, since I know it's not reading actual torque output, what is it basing "engine load" off of? Vacuum? Throttle position? Wild-ass-guess?

Yes.

 

[lBasket]

Yes.

 

[Bergy1]

You are under geared with the 06. The load is a Calc based in part on manifold pressure. Your foot is further down on the pedal to maintain the same speed under the conditions with the 06 Auto.

I would agree, but it is increased while at idle, approximately 25-30% higher than the other two TJ's.

 

[Juggernaut]

You didn’t mention idle. There are many variables . Difference in base idle speed, exhaust restriction, vacuum leak, virtually anything that would affect MAP reading.

 

[jjvw]

Assuming both are still the factory 410 gears, the differences between the tire size and transmissions and the resulting rpms/ground speeds when you are making the comparisons are why the engine loads are different.

 

[Bergy1]

Assuming both are still the factory 410 gears, the differences between the tire size and transmissions and the resulting rpms/ground speeds when you are making the comparisons are why the engine loads are different.

Even at idle? My first thoughts were tire size, but it is significantly more at idle. Not sure anything is actually wrong, runs good, mileage is good, power seems on par with the other two jeeps. It just seems strange that the "engine load %" is so far off???