Displacement on demand

[FerociousP]

Originally Posted by RETed

Another data point...

Several Sac to Vegas and back trips netted me 400 miles between gas fill-up's.
1987 Turbo II on a (reprogrammed) stock ECU
16.6 gallon full capacity fuel tank, but filling up at 14 gallons each time.
That makes it 28.5 miles per gallon.
Key is to drive run under the secondary injector crossover point at 3,800RPM, which is about 75mph - 80mph on my car.


-Ted

I also noticed that with a Rtek ecu on my way to DGRR this year.... I would be around 15.0 afr until the secondaries kicked in, and then it dropped to 12.1 afr. I was alone so I couldn't tune the Rtek, but this is something that people with stock ecus are just stuck with

I got 23ish mpg while hovering around that point with probably spending most of my time about that