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FJR Motorcycle Forums
Technical & Mechanical Problems
Throttle body sync
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<blockquote data-quote="djsmith1000" data-source="post: 288294" data-attributes="member: 3688"><p>Hello,</p><p></p><p>Sorry to resurrect an old thread, but I figured its OK since it was posted in the FAQs</p><p></p><p>I tried this method with my new homemade 4 way differential manometer this afternoon. I would NOT recommend it. I found that disconnecting the injectors has a profound effect on the vacuum. I like the idea of generating load, but this is not the way to do it.</p><p></p><p>My theory on why is as follows.</p><p></p><p>When the intake valve opens, there is some residual pressure left in the cylinder. This varies based on combustion, exhaust pressure waves (functions of pressure, temperature, density, composition,.... )etc. The cylinder pressure at IVO may have a large effect on the amount of air that is drawn into the cylinder. This seems to be a plausible explanation to the difference in intake pressure.</p><p></p><p>Hope this helps. I tried the other method of bringing the engine slowly up to speed, and was not satisfied with it either. Found that the outer two cylinders tended to build up lots of vacuum under certain conditions. So.... I did the best I could, set and synced the idle, and threw it back together.</p><p></p><p>Results... it helped significantly. Actually, one of the first things I noticed is that my AE tended to shift smoother and faster.</p></blockquote><p></p>
[QUOTE="djsmith1000, post: 288294, member: 3688"] Hello, Sorry to resurrect an old thread, but I figured its OK since it was posted in the FAQs I tried this method with my new homemade 4 way differential manometer this afternoon. I would NOT recommend it. I found that disconnecting the injectors has a profound effect on the vacuum. I like the idea of generating load, but this is not the way to do it. My theory on why is as follows. When the intake valve opens, there is some residual pressure left in the cylinder. This varies based on combustion, exhaust pressure waves (functions of pressure, temperature, density, composition,.... )etc. The cylinder pressure at IVO may have a large effect on the amount of air that is drawn into the cylinder. This seems to be a plausible explanation to the difference in intake pressure. Hope this helps. I tried the other method of bringing the engine slowly up to speed, and was not satisfied with it either. Found that the outer two cylinders tended to build up lots of vacuum under certain conditions. So.... I did the best I could, set and synced the idle, and threw it back together. Results... it helped significantly. Actually, one of the first things I noticed is that my AE tended to shift smoother and faster. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Throttle body sync
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