lean cruise in OS3

[Tordne]

I went from 15.6 at cruise to 13.8 and picked up 3 mpg.

Have you revalidated this. It just seems strange to run rich and gain mpg

[TAQuickness]

Have you revalidated this. It just seems strange to run rich and gain mpg

Every day for the last month. I think it has more to do with the actual AFR in the cylinder than what the WB is reading. It takes x amount of power to hold the vehicle at a steady speed. The less work it takes to make that power, the more economy you'll realize.

[oztracktuning]

Tuning for torque seems to be the key. I got a customers car to give 43mpg over a 60mile period at about 60mph. It was a M6 3.45 VX LS1 running OS3. Desired afrs at cruise 15.6:1 , very active DFCO and a lot of timing near cruise cells maximizing just off cruise torque. The car is super smooth.

Its mods are 4 into 1s, metal cats, improved CAI, 160 thermo

[minytrker]

I went from 15.6 at cruise to 13.8 and picked up 3 mpg.



Not bad. I was happy to get 21mpg on the hiway. I'd like to see how you did this.

Autotune and timing I think gets great results for gas mileage on the highway. Im running C.O. #3 but at cruise its still running off the o2s going for 14.7. I get on the highway with the cruise set at 70-80mph I get 28-31mpg. Now around town the way I drive it sucks down gas pretty bad. Whats funny is when the car was bone stock untuned it only got 28mpg. I have added 100hp at the wheels and get 3 more mpg now, got to love it.

[oztracktuning]

Get DFCO happening more aggressively and work on getting more timing advance at low loads particularly at low rpms.

[Extinct]

What sort of DFCO is working best ?

[horsepower1]

Autotune and timing I think gets great results for gas mileage on the highway. Im running C.O. #3 but at cruise its still running off the o2s going for 14.7. I get on the highway with the cruise set at 70-80mph I get 28-31mpg. Now around town the way I drive it sucks down gas pretty bad. Whats funny is when the car was bone stock untuned it only got 28mpg. I have added 100hp at the wheels and get 3 more mpg now, got to love it.

How do you get cruise to run off 02s -- this is exactly what I am after. Seems like lean cruise could do it perfect, if enabled.

[oztracktuning]

Lean cruise doesnt run off the 02s - it needs an accurate VE table - i think thats how it works anyway.

[horsepower1]

Lean cruise doesnt run off the 02s - it needs an accurate VE table - i think thats how it works anyway.

it must have some feedback, as it has correction parameters. To correct, it must have some feedback, I'd assume from 02s.