Which condition would be more fuel efficient?
1. 1250° EGT at 24" of boost.
2. 1100° EGT at 32" of boost.

Thanks.

 

I would say #1 because you should be stoped cooling things down.

 

More boost = more fuel no matter what the egts are

 

I guess I should have included more info.
I changed from a 14cm exhaust housing to a 12cm.
The plate and afc is in the same position, the hill was the same grade and the rpm was the same.
14cm= 24" boost at 1250°
12cm= 32" boost at 1100°
Which would be more fuel efficient?

 

Like I said before, more boost = more fuel no matter what the egts are

 

Not doubting your statement, but with the same amount of fuel wouldn't the 12cm housing provide more boost? I see it like a narrower exhaust pipe, exhaust gasses flow through it faster; thus, turning the turbo wheel faster and providing more boost.

 

Well, after a 5900 mile trip at the same speeds and to the same destination and conditions and back, the number 2. 12cm= 32" boost at 1100° wins out over the 1. 1250° EGT at 24" of boost.
Fuel mileage was up by .5 mile per gallon.
Good power and I don't have to stare at the pyrometer.

Thought you would like to know.