Buell 1125R Rear Fuel Injector Disconnect Switch

I may have found a solution for excessive engine heat in stop and go traffic. I installed a switch in series with the rear fuel injector. This reduces fuel consumption and therefore heat generated while idling. This also increases cooling capacity by drawing air through the rear cylinder. Luckily, the ECU is smart enough to keep the bike running on one cylinder and the check engine light disappears when the rear fuel injector is turned back on. Ambient air temperature was about 105 degrees F. At the start, the bike is idling on both cylinders and you can see the coolant temperature continue to climb. If I were riding in stop and go traffic, the coolant temperature would climb to at least 220 degrees F. Then I switch the rear fuel injector off and the ECU shows two errors: rear injector fault and rear O2 sensor fault. Afterward, the coolant temperature drops by 10 degrees F in 2 minutes or so. I rev the engine on one cylinder to show that it is still usable. Next, I switch the rear injector back on to show that the ECU extinguishes the check engine light and the bike runs on both cylinders, which you can hear immediately. Finally, the coolant temperature climbs again while idling on two cylinders. I actually drove the Buell for a few miles on one cylinder and it worked, but it felt much slower. The sound was quite a bit different and it required much more throttle to get it to move, but it will work great in hot stop and go traffic.
http://hildstrom.com/projects/buellfi/index.html
http://www.badweatherbikers.com/buell/messages/290431/649557.html

Category:

Autos & Vehicles

Tags:

• Buell
• 1125R
• fuel
• injector