Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Aerocivic

basjoos · 08-31-2009, 03:01 PM

Refilled for the first time since installing the B15Z1 (VX lean burn) engine in my car and got 81.2 MPG over 438 miles of mostly interstate driving with a fair amount of driving on wet roads. Its been up to 75mph on a level road without it dropping out of lean burn. At that speed, it was showing 5 usec on the SuperMID, the ceiling for lean burn is at 6.1 usec, so I still have some headroom left. I'll have to find a highway with a higher speed limit before I can continue trying to find the upper speed limit for lean burn operation (the max speed will probably will be RPM limited rather than load limited for lean burn). On a flat road, its getting 100mpg (at 3.0usec) at 55mph and 120mpg (at 2.5usec) at 35mph. The results on the SuperMID were close enough to the calculated that I'll want to average a couple of tanks before making a change to the MID's calibration.

If the car has the correct shape, you don't need a hybrid system to get good mileage on the highway. I think even an Insight-I would be hard pressed to match my highway mileage at normal highway speeds now and its a much smaller car.

08-31-2009, 03:01 PM	#300 (permalink)
basjoos Master EcoModder Join Date: Dec 2007 Location: Upstate SC Posts: 1,088 Aerocivic - '92 Honda Civic CX Last 3: 70.54 mpg (US) AerocivicLB - '92 Honda Civic CX Team Honda 90 day: 55.14 mpg (US) Camryglide - '20 Toyota Camry hybrid LE 90 day: 65.83 mpg (US) Thanks: 16 Thanked 677 Times in 302 Posts	Refilled for the first time since installing the B15Z1 (VX lean burn) engine in my car and got 81.2 MPG over 438 miles of mostly interstate driving with a fair amount of driving on wet roads. Its been up to 75mph on a level road without it dropping out of lean burn. At that speed, it was showing 5 usec on the SuperMID, the ceiling for lean burn is at 6.1 usec, so I still have some headroom left. I'll have to find a highway with a higher speed limit before I can continue trying to find the upper speed limit for lean burn operation (the max speed will probably will be RPM limited rather than load limited for lean burn). On a flat road, its getting 100mpg (at 3.0usec) at 55mph and 120mpg (at 2.5usec) at 35mph. The results on the SuperMID were close enough to the calculated that I'll want to average a couple of tanks before making a change to the MID's calibration. If the car has the correct shape, you don't need a hybrid system to get good mileage on the highway. I think even an Insight-I would be hard pressed to match my highway mileage at normal highway speeds now and its a much smaller car. __________________ aerocivic.com Last edited by basjoos; 08-31-2009 at 03:06 PM..