Suzuki Burgman modification (aerodynamics + gearing mods) - Page 13 - Fuel Economy, Hypermiling, EcoModding News and Forum

janvos39 · 04-03-2011, 12:48 PM

With the weather improving in Belgium I could make some test kilometers on the Burgman.
Acceleration was slow, so I took out 2 of the 8 centrifugal weights of the CVT.
This helped a lot. I assume that by reducing my engine size from 385 to 297 cc was the main reason for the CVT to shift to fast to the higher ratio.
Last measurent of the FE comes at 80 MPG , best sofar with this Burgman project.
But still many things to come to make more improvement. At this moment I am visiting the Vetters in CA.

redyaris · 04-03-2011, 05:48 PM

Quote:

Originally Posted by janvos39

With the weather improving in Belgium I could make some test kilometers on the Burgman.
Acceleration was slow, so I took out 2 of the 8 centrifugal weights of the CVT.
This helped a lot. I assume that by reducing my engine size from 385 to 297 cc was the main reason for the CVT to shift to fast to the higher ratio.
Last measurent of the FE comes at 80 MPG , best sofar with this Burgman project.
But still many things to come to make more improvement. At this moment I am visiting the Vetters in CA.

Good to hear from you again. I am hopeing to get into that 80mpg zone myself with the modifications I am doing to the GS500. At present I am working on cargo boxes behind the riders legs with some taper at the rear and a behind the rider tapered cargo box as you suggested. I will be going to a 33 tooth rear sprocket, with a 17 tooth at the front sprocket and will use a 7% larger rear tire all of which will drop the rpm by about 1500 rpm [5500rpm ->4000rpm] below stock at 110km/hr. I should see some preliminary test result in 2 weeks when the snow melts. I will be going to a fuel economy run in Lacey Washington and If I can get into the 80+mpg zone on the 1100km [700 mile] trip to Lacey on May 7, I will go onto the Vetter Challeng in Carmel the following weekend.

janvos39 · 04-05-2011, 12:38 AM

You will be probably OK on the gearing. I run with 300 cc about 6000 rpm at the 110 km speed.
For a 500 that would mean 3600 rpm if the fairing is comparable. Assuming that the paperbox fairing is less efficient so than you need some more rev's so with the 4500 you will be in the wright range.
I certainly hope that you will show up in het Vetter contest, I am sure it will be an inspiring experience.

janvos39 · 09-03-2011, 05:28 PM

This is the new appearance of the Burgman.A new nose from fiberglass.
After the first tankfill it showed an improvement of approx 4 to 5 MPG from 79 to 84 MPG in normal traffic conditions.
The engine is 297 cc The bore of a 250 Burgamn on the engine of a 385 giving the 297 cc. The carburettor is 28 mm from the 250 Burgman.
Gearing is modified to 4.803 (std is 6.168)
And I am using only 6 from the 8 centrifugal weights of the crankshaft pulley.

PeterS · 09-03-2011, 06:28 PM

Interesting new nose fairing Janvos .I'd be really interested in knowing if covering in the sides of the rider opening had a big effect? I've wondered about some kind of stiff flap from industrial conveyor belting or similar ,something stiff enough not to rippling and flap in the wind ,perhaps with magnets to hold it closed when riding ?

It should reduce the drag a lot .

janvos39 · 09-04-2011, 03:26 AM

I have always been using the side flaps .So I donot know how much difference it would be. When I started I made the side flaps for comfort reason. It is quite warmer for your legs compared with an open bike.
The side flaps have a hinge and are locked in place by some strong magnets.