Author Topic: 20mpg  (Read 5008 times)

Offline jjs1234

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20mpg
« on: July 29, 2017, 03:14:37 PM »
Finally figured out why I'm going through so much gas... I'm getting 20mpg. Wtf...

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  • Northern California
  • 1984 K100
Check out my build! Complete tear-down!
Mr. Creative

Offline jjs1234

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Re: 20mpg
« Reply #1 on: July 29, 2017, 05:11:25 PM »
Finally figured out why I'm going through so much gas... I'm getting 20mpg. Wtf...

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Ran it mostly on the hyw today. 21.3mpg

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  • Northern California
  • 1984 K100
Check out my build! Complete tear-down!
Mr. Creative

Offline rbm

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Re: 20mpg
« Reply #2 on: July 29, 2017, 06:28:34 PM »
Hard to read because of the glare.  Is the first picture showing 60.2 miles driven and you filled up with 3.274 gallons?  And the second picture shows 50.0 miles for 2.345 gallons consumed?


The programming on your Acewell is way off; it's not the K-bike.  At that rate of consumption, liquid gas would need to be pouring out the exhaust.


Check the tire circumference value and make sure that it is reasonably close to the actual circumference of the driven wheel.  It is critical to get that number right if you want the odometer to register distances correctly and accurately.  Are you using the rear OEM sensor or the Acewell magnetic sensor?  Drive a known distance after resetting one of the trip meters and make sure the odometer is reflecting that distance exactly.  That will either validate the Acewell's programming or indicate the area where your problem lies.
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Toronto, Ontario

1987 K75 - Build Blog @http://k75retro.blogspot.ca/

Offline Chaos

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Re: 20mpg
« Reply #3 on: July 30, 2017, 12:02:29 PM »
a little more info than a odometer reading and a pump readout would be helpful.  Maybe you're pulling a trailer and mounted a sidecar?  :popcorm
  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
sold 6/23
2023 Ural 2WD sidecar (BMW's bastard step child)

Offline jjs1234

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  • Posts: 409
Re: 20mpg
« Reply #4 on: July 31, 2017, 12:55:05 AM »
I will have to set a Google map waypoint and drive to it. I have the RT final drive and I think a k1100 17in rear rim as opposed to the oem 18in??

Something is off though. Just wondering... If the Speedo speed registers correctly (multiple speed radar verify this) then doesn't that mean the trip meter is correct?

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  • Northern California
  • 1984 K100
Check out my build! Complete tear-down!
Mr. Creative

Offline jjs1234

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  • Posts: 409
Re: 20mpg
« Reply #5 on: July 31, 2017, 12:57:09 AM »
a little more info than a odometer reading and a pump readout would be helpful.  Maybe you're pulling a trailer and mounted a sidecar?  :popcorm
Tell me what info you want and I will get it.


Acceleration under 1/3 throttle is more intense than Full Throttle weird enough. Currently at sea level if that makes a difference.

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  • Northern California
  • 1984 K100
Check out my build! Complete tear-down!
Mr. Creative

Offline jjs1234

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  • Posts: 409
Re: 20mpg
« Reply #6 on: July 31, 2017, 12:59:19 AM »
Hard to read because of the glare.  Is the first picture showing 60.2 miles driven and you filled up with 3.274 gallons?  And the second picture shows 50.0 miles for 2.345 gallons consumed?


The programming on your Acewell is way off; it's not the K-bike.  At that rate of consumption, liquid gas would need to be pouring out the exhaust.


Check the tire circumference value and make sure that it is reasonably close to the actual circumference of the driven wheel.  It is critical to get that number right if you want the odometer to register distances correctly and accurately.  Are you using the rear OEM sensor or the Acewell magnetic sensor?  Drive a known distance after resetting one of the trip meters and make sure the odometer is reflecting that distance exactly.  That will either validate the Acewell's programming or indicate the area where your problem lies.


Well apparently I can't edit a post, so anyway I'm using the OEM sensor with the BEP 2.0. circumference should be correct if my mph speed it's correct?

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  • 1984 K100
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Mr. Creative

Offline The Mighty Gryphon

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Re: 20mpg
« Reply #7 on: July 31, 2017, 01:14:23 AM »
Is there a highway anywhere near you with mile markers that you can do a run on to check the odometer?  I have found them to be very accurate, especially if you do a ten mile or longer run.
  • In my garage in Marilla, NY
  • '91K100RS White/Blue
Current:
'91 K100RS16V "Moby Brick Too"

Past:
'94 K75RT "Ilsa, She Wolf of the SS"
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

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