About that high idle kit

[Mopar1973Man]

Just exactly what is this mpg fooler doing to the engine management to get these impressive numbers? Sorry if this question has already been answered somewhere on the forums.

 

Believe it or not retarding timing or preventing excessive advancement from excessive cold air. Cold air tends to hurt MPG's optimal IATtemps for MPG's is about 100-140*F

[cajuncummins]

So, you flip it on after you have run trough the gears and let it cruise with it on and cut if off when you stop and go through the gears again?

[Ilikeoldfords]

I let the truck warm up for a couple minutes after starting just to let the grids run a few times. Then I flip over to the mpg mode until the next time I shut it down. The only thing that fooler is doing is basically letting the computer think that it is 100 degrees F outside instead of whatever it actually is. This makes the computer advance the ignition timing to where it would be in the summer time. Thus, you gain the lost mileage back from the ignition timing being retarded for the cold air.

[Mopar1973Man]

I let the truck warm up for a couple minutes after starting just to let the grids run a few times. Then I flip over to the mpg mode until the next time I shut it down. The only thing that fooler is doing is basically letting the computer think that it is 100 degrees F outside instead of whatever it actually is. This makes the computer advance the ignition timing to where it would be in the summer time. Thus, you gain the lost mileage back from the ignition timing being retarded for the cold air.

 

Actually your backwards.

 

It sets the IAT to 143*F and retards the timing. The colder the air temp gets the more and more advanced the timing gets. Which with cold air and overly advanced timing gets that heavy knock where when you flip to MPG mode the knock fades away because of the retarded timing. High cetane winter fuel will make it even more pronounced.

[Ilikeoldfords]

My bad. I was thinking one way but it came out on the keyboard the other way. It has been one of those days!! :banghead:

[snowshoveler]

I thought it was the other way around too.

Thinking of things like in a gas engine just dosen't work in a 24v.

Rwegards Chris

[Mopar1973Man]

People are hung up on several things they think are like gasoline engine.

[cajuncummins]

My point is, would it be better to have the normal (advanced) timing while you are accelerating and running through gears, then once you are up to speed with your load you flip to MPG mode????

[Mopar1973Man]

Soon to find out what the MPG fooler does to power I'm setting up to hit the dyno in April to do some testing of the effects.

[hex0rz]

My point is, would it be better to have the normal (advanced) timing while you are accelerating and running through gears, then once you are up to speed with your load you flip to MPG mode????

 

...nope. Because your just making the truck think its summer weather. So in essence, it would be like driving in AZ all year long, even though you may live in colder areas.

[cajuncummins]

I would speculate that the egt's will be a problem under load with retarded timing.

[Ilikeoldfords]

Unless you are running some huge injectors, or you have a boost leak, egt's should just about never be a problem. I dont notice much if any difference in egt's running the fooler vs. no fooler.

[Mopar1973Man]

Remember the timing is a dynamic thing. It still advances and retards but the timing is over all retarded compared to without the fooler. Like with P7100 pumps the more you bring timing down to like 13-14* realm the torque typically moves down in the RPM's. Where advance timing the torque curve typically moves up in RPM's hence which in racing they typically go upwards 16-17* and even more optimizing the torque curve for the RPM's. So the fooler is attempting to bring the timing value down to daily driver level mostly for city and non-interstate driving. As for Interstate driving the speed is typically to fast and the wind drag to great to see much change.

[cajuncummins]

Thanks, that was the explanation that I needed.

[Diesel]

So in essence, it would be like driving in AZ all year long.

Well, what if you are driving in AZ all year long?

[Mopar1973Man]

Still can use it. Like all summer in Riggins, ID it's about 100-110*F so I've got desert type heat here too.