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suspectnumber961 · 04-25-2011, 05:22 AM

Below is another version of the Zetec BSFC chart with actual observed LOD numbers roughly translated into torque in NMs. Engine warm on level ground.

From bottom left to top right...

- 42-45 LOD.... cruise in OD at 45 mph and ~ 1800 rpm...seems to be the best mpg area

- 50-54 LOD (24 TPS).... acceleration at a mostly steady 2000 rpm...how I've been driving below 40 mph where the trans shifts into OD

- 66-70 LOD (28-32 TPS).... acceleration at 2200 to 2700 rpms...according to the "BSFC theory"...this type of acceleration SHOULD be more efficient...and more fun? Even funner and more efficient should be in the 2500 to 3000 rpm range?

IF the extra drive train friction losses (auto trans) are offset by the increased efficiency?

The 3rd (oval shape...2200 to 2700 rpms) option would only be used up to 40 mph...where the car shifts into OD...then the pedal would be feathered as usual for best mpg...and the LOD/RPM would drop down to the lower left line.

04-25-2011, 05:22 AM	#8 (permalink)
suspectnumber961 EcoModding Alien Observer Join Date: Mar 2008 Location: I flitter here and there Posts: 547 highcountryexplorer - '86 Nissan 720 KC 4x4 ST with fiberglass cap 90 day: 21.78 mpg (US) Elroy - '03 Ford Focus ZX3 w/Zetec DOHC engine 90 day: 32.89 mpg (US) Thanks: 6 Thanked 78 Times in 65 Posts	Below is another version of the Zetec BSFC chart with actual observed LOD numbers *roughly translated* into torque in NMs. Engine warm on level ground. From bottom left to top right... - 42-45 LOD.... cruise in OD at 45 mph and ~ 1800 rpm...seems to be the best mpg area - 50-54 LOD (24 TPS).... acceleration at a mostly steady 2000 rpm...how I've been driving below 40 mph where the trans shifts into OD - 66-70 LOD (28-32 TPS).... acceleration at 2200 to 2700 rpms...according to the "BSFC theory"...this type of acceleration SHOULD be more efficient...and more fun? Even funner and more efficient should be in the 2500 to 3000 rpm range? IF the extra drive train friction losses (auto trans) are offset by the increased efficiency? The 3rd (oval shape...2200 to 2700 rpms) option would only be used up to 40 mph...where the car shifts into OD...then the pedal would be feathered as usual for best mpg...and the LOD/RPM would drop down to the lower left line. __________________ *Carry on humans...we are extremely proud of you.* .................. Forty-six percent of Americans believe in the creationist view that God created humans in their present form at one time within the last 10,000 years. GALLUP POLL Last edited by suspectnumber961; 04-30-2011 at 08:25 AM..