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FJR Motorcycle Forums
Technical & Mechanical Problems
Considering a different take on abrubt throttle response due to Yamaha fuel cut off when coasting in gear
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<blockquote data-quote="rocketman" data-source="post: 1078160" data-attributes="member: 7472"><p>When you close off the throttles in deacceleration the intake manifold vacuum exceeds a certain value and the fuel injectors are turned off. I didn't messure it - it may be around 20". And you have noticed as I have, if you are still deaccelerating, when you crack open the throttle bodies again, asking for fuel, you get no fuel until the intake vacuum goes back down. I have have tried several tricks to fake out the intake pressure sensor with different vacuum relief valves and bleeds but never got it quite right. For one think it always tripped the check engine light. the best thing was the power commander 3 with wallys smoothness map. It's not perfect but it works good enough.</p></blockquote><p></p>
[QUOTE="rocketman, post: 1078160, member: 7472"] When you close off the throttles in deacceleration the intake manifold vacuum exceeds a certain value and the fuel injectors are turned off. I didn't messure it - it may be around 20". And you have noticed as I have, if you are still deaccelerating, when you crack open the throttle bodies again, asking for fuel, you get no fuel until the intake vacuum goes back down. I have have tried several tricks to fake out the intake pressure sensor with different vacuum relief valves and bleeds but never got it quite right. For one think it always tripped the check engine light. the best thing was the power commander 3 with wallys smoothness map. It's not perfect but it works good enough. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Considering a different take on abrubt throttle response due to Yamaha fuel cut off when coasting in gear
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