Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Suzuki Burgman modification (aerodynamics + gearing mods)

janvos39 · 06-13-2009, 04:06 PM

The streamlining of the burgman resulted in less needed power. This can be noticed on the amount of throttle which is needed for a certain speed. So by using less power at that speed the specific fuel consumption due to the lower load is less good. So overall gain is marginal as can be seen on the earlier tank fills. What happens by changing the gearing is two positive things concerning the FE. Lower rev means more load so specific fuel consumption gets better and due to the lower revs the engine losses are lower as well. Rule of thumb for these losses is that you loose 1 liter per hour fuel with 1000 cc engine at 1000 rpm. So my losses have gone down at 75 MPH from 0.385*6.548-0.385*5.098=0.558 L/hr
The engine in standard trim runs 6548 rpm at 120 km/hr . With this modification it is now 5098 rpm at 120 Km/hr.

06-13-2009, 04:06 PM	#69 (permalink)
janvos39 EcoModding Apprentice Join Date: Jan 2009 Location: Belgium Posts: 159 jvsgears - '14 Skoda Octavia Team m8 90 day: 52.47 mpg (US) Thanks: 22 Thanked 38 Times in 28 Posts	The streamlining of the burgman resulted in less needed power. This can be noticed on the amount of throttle which is needed for a certain speed. So by using less power at that speed the specific fuel consumption due to the lower load is less good. So overall gain is marginal as can be seen on the earlier tank fills. What happens by changing the gearing is two positive things concerning the FE. Lower rev means more load so specific fuel consumption gets better and due to the lower revs the engine losses are lower as well. Rule of thumb for these losses is that you loose 1 liter per hour fuel with 1000 cc engine at 1000 rpm. So my losses have gone down at 75 MPH from 0.3856.548-0.3855.098=0.558 L/hr The engine in standard trim runs 6548 rpm at 120 km/hr . With this modification it is now 5098 rpm at 120 Km/hr.