IHADAV8.com - Turbo Buick Tech, and Nonsense

Tech Area => General Buick Tech => Topic started by: Wrecked Em on April 25 2011, 09:36:44 PM

Title: Lean Cruise
Post by: Wrecked Em on April 25 2011, 09:36:44 PM

Anyone using Lean Cruise on their chip? If so, what kind of MPG are you getting?

Title: Lean Cruise
Post by: Steve Wood on April 25 2011, 10:35:50 PM

As I am using a speed density chip, I program my own cruise to be around 15.5-1 which is around 020 on the oem o2.   I get around 24-25 on my more moderate car on cruise control at 70

Title: Lean Cruise
Post by: Wrecked Em on April 25 2011, 10:40:10 PM

Quote from: "Steve Wood @ Mon Apr 25, 2011 8:35 pm"

As I am using a speed density chip, I program my own cruise to be around 15.5-1 which is around 020 on the oem o2.

Title: Lean Cruise
Post by: Steve Wood on April 26 2011, 10:53:56 AM

I only have experience in modern years with TT chips..make that recent years LOL

but, they kick out of the cruise mode when the lv8 rises to a certain level.  Therefore, if you live in hilly country, the lv8 will rise every time you start up an incline and the car will go for a richer number.  In other words, the best gas mileage  comes where there are few changes in incline.

I used to set my cruise where the oem O2 read a steady 000 on the scanmaster.   This was close to 17-1 on the wb.  When I went to 75# injectors, I came down a bit for fear that the larger injectors might be a bit erratic and low pulse widths and I might have a problem.

In the early days of the MaxEffort, I used to keep removing fuel until I could feel a skip in the engine at 75 mph, then I would add a couple percent back in and call it good.  That always read 000 on the sm.

Pretty soon, someone will come in and inform us that setting the a/f to stochiometric gives the best mileage but I am calling bs in advance of that.  :)