Hi Robert,

Rule of thumb says you are losing 3% of HP for every 1000' altitude.

The ECU can correct the mixture, but it can't increase the O2 content of
the intake air.

Happy Trails,

Greg Potts
Toronto, Ontario Canada
197x Westfakia "Bob the Tomato"
1987 Wolfsburg Weekender Hardtop
www.pottsfamily.ca

BUSES OF THE CORN - AUGUST 13-15th, 2010
www.busesofthecorn.ca

On 8/21/2010 4:31 PM, Robert Fisher wrote:
> My van does not run well at high altitude. When we came here to Mammoth last
> year the van lost a considerable amount of power after running normally the
> whole way up here, and despite the fact that I filled up on local gas. I
> don't remember the octane, but it was one of those pumps where you have
> three choices for one hose and I think I'd remember picking something other
> than the usual 87... on the other hand you'd think that "regular" here would
> be a high-altitude formulation. I am going to try to remember to check it on
> the way back through town.
> This time I filled up on 87 in Bishop with the same results. Everywhere we
> go here is between 8&  9 thousand feet; in addition to the low power it's
> difficult to start when cold, to the point that I actually have to goose the
> gas until it smooths out. Is there some point where the ECU can no longer
> compensate well for the altitude, or does this point to another problem?
>
> On another distantly related note, I've noticed that the wood fires here
> seem to smoke much more than at lower elevations... is there anything to
> that?
>
> Cya,
> Robert
>

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