Ultra Power programming

[Ron & Dee]

I hope this is not a dumb question, but if it is just consider the source

Is it possible to program the UP to work different in the higher altitudes than at sea level or lower altitudes?

I seem to be getting better mpg averages, according to my Scangauge, in the higher altitudes than I am in the lower altitudes.

I know there are probably other variables in play but was just curious about the difference

Thanks,

Ron

[JonBrazel]

To answer your question, no there is no difference made in the program to account for altitude. The reason you are seeing better MPG at higher elevations is because there is less air which equals less fuel used to maintain proper air/fuel ratios.

[Ron & Dee]

Thanks Jon,

I guess that would also explain why you can get by with the lower octane at the higher altitudes.

That would also explain how some people can show better gas mileage than we do down here at sea level.

Ron

[golden]

I really haven't travelled here in the mountains in my MH very much, Rather, I drove up from TX and enjoyed the ride with more power than prior to UP. That being said, my Saturn Vue gets 4-7 mpg better mileage here at altitude than back home at 750'. Also, it is a LOT cooler here than back home!

[rgrstndgby]

Quote:

Originally Posted by JonBrazel To answer your question, no there is no difference made in the program to account for altitude. The reason you are seeing better MPG at higher elevations is because there is less air which equals less fuel used to maintain proper air/fuel ratios.

Jon, are you saying that at the SAME SPEED, you will use less fuel at altidude?...rgr...

[oemtech]

I think want Jon is saying is... As your altitude changes the O2 sensors, knock sensors etc will use the fuel enrichment maps to try and compensate for the changes. Remember the ECM, O2 sensors Knock sensors etc are trying to maintain a 14.7:1 fuel ratio with no ping.

You will NOT gain HP you will actually lose 2% to 3% per 1,000 ft of altitude. So, had you had a stock tune with say 265 hp at the rear wheels and were at 8,000 ft and we use 2% you would lose approx 42 hp.

[TrekPR]

I always thought driving at altitude equaled better milage because of less wind resistance and humidity. Sea level the air is thick and heavy because of the atmosphere pressure and humidity. It is the same reason a golf ball travels further at altitude. I wish I could figure out how to get to altitude without going up hill.

[rgrstndgby]

Quote:

Originally Posted by oemtech I think want Jon is saying is... As your altitude changes the O2 sensors, knock sensors etc will use the fuel enrichment maps to try and compensate for the changes. Remember the ECM, O2 sensors Knock sensors etc are trying to maintain a 14.7:1 fuel ratio with no ping. You will NOT gain HP you will actually lose 2% to 3% per 1,000 ft of altitude. So, had you had a stock tune with say 265 hp at the rear wheels and were at 8,000 ft and we use 2% you would lose approx 42 hp.

.................................................. .................................................

yea, I understand all that, I thought it sounded like he was implying that due to the diminished O2,and subsequent lessened fuel demand, that speed could be maintained on less fuel.. That would put those guys onto something really special... rgr...

[DriVer]

Quote:

Originally Posted by Ron & Dee I seem to be getting better mpg averages, according to my Scangauge, in the higher altitudes than I am in the lower altitudes.

Ron, The thinner atmosphere up at that altitude reduces the coefficient of friction on the frontal area of your vehicle thereby increasing your fuel economy!

[Ron & Dee]

Quote:

Originally Posted by DriVer Ron, The thinner atmosphere up at that altitude reduces the coefficient of friction on the frontal area of your vehicle thereby increasing your fuel economy!

And then if things weigh less at higher altitudes, it would take less energy to move them

Ron

[TrekPR]

I tried for for 30 minutes to figure out how to add icons in the original post especially the whistling one. Where am I going wrong?

[oemtech]

Don't use the Quick Reply.. use the Post Reply.

If you use Quick Reply an want to add a "smiley" you will have to Edit it in the first hour. But you wil have to do a full Edit by clciking the Edit button on the Edit screen. Confused

OBTW - I posted this with Quick Edit and then went back and did the Edit/Edit to add the

[DriVer]

If a person chooses to use the "Post Reply" button to the left of the bottom of the posts in this topic one could expect a right column full of smilies. Now you can also get to those if you click on the "Advanced" button as well and the bottom of the edit screen. Click on the [more] for a whole bunch more of content in the smile library.

[M&EM]

Quote:

Originally Posted by DriVer Ron, The thinner atmosphere up at that altitude reduces the coefficient of friction on the frontal area of your vehicle thereby increasing your fuel economy!

Then we must also remember to include the effects of increase in relative tire pressure at higher altitudes which would result in lower rolling resistance....