Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - 2011 GM to EPA certification test documents (shows dyno "road load" HP @ 50 mph)

gone-ot · 06-08-2012, 05:44 PM

Carlos, yes, it's really an "eye opener" *IF* the Test Load HP (TLHP) values truly (and accurately) represent the total road load HP required at 50 mph. Note: N/V = engine speed (RPM) at 50 MPH.

Cruze Eco, M6, AR = 3.83:1, P215/55R17 ALS Goodyear, N/V = 30.8, 3312 lbs, TLHP = 9.3; F0 = 23.96, F1 = 0.1143, F2 = 0.01606

Cruze Eco, A6, AR = 3.53:1, P215/55R17 ALS Goodyear, N/V = 34.9, 3434 lbs, TLHP = 10.1; F0 = 26.20, F1 = 0.1554, F2 = 0.01686

Hence, the TLHP equations are something like these:

• _9.3HP = 23.96*(lbf) + 0.1143*(lbf/mph) + 0.01606*(lbf/mph^2) ...so, lbf = 0.388 @ 50 MPH (M6)

• 10.1HP = 26.20*(lbf) + 0.1554*(lbf/mph) + 0.01686*(lbf/mph^2) ...so, lbf = 0.385 @ 50 MPH (A6)

Anybody with an Eco Cruze know if these match-up with the applet we have here?

06-08-2012, 05:44 PM	#3 (permalink)
gone-ot ...beats walking... Join Date: Jul 2009 Location: . Posts: 6,190 Thanks: 179 Thanked 1,525 Times in 1,126 Posts	Carlos, yes, it's really an "eye opener" IF the Test Load HP (TLHP) values *truly* (and accurately) represent the total road load HP required at 50 mph. Note: N/V = engine speed (RPM) at 50 MPH. Cruze Eco, M6, AR = 3.83:1, P215/55R17 ALS Goodyear, N/V = 30.8, 3312 lbs, TLHP = 9.3; F0 = 23.96, F1 = 0.1143, F2 = 0.01606 Cruze Eco, A6, AR = 3.53:1, P215/55R17 ALS Goodyear, N/V = 34.9, 3434 lbs, TLHP = 10.1; F0 = 26.20, F1 = 0.1554, F2 = 0.01686 Hence, the TLHP equations are something like these: • _9.3HP = 23.96(lbf) + 0.1143(lbf/mph) + 0.01606(lbf/mph^2) ...so, lbf = 0.388 @ 50 MPH (M6) • 10.1HP = 26.20(lbf) + 0.1554(lbf/mph) + 0.01686(lbf/mph^2) ...so, lbf = 0.385 @ 50 MPH (A6) Anybody with an Eco Cruze know if these match-up with the applet we have here? Last edited by gone-ot; 06-08-2012 at 09:02 PM..