interesting thing I learned while playing with my tbs sync tool

[Makuna]

last year I created an electronic tbs vacuum measuring tool. This last week with the nice weather but being totaling sick (I hate colds) I brought out the tool and did some work on the software. One feature I added was RPM, and another was showing the total change in vacuum per cylinder; as each cycle and the curve could be measured.

I connected it up yesterday and tested things out on the running bike. The interesting thing of note was that cylinder 3 had a larger range of vacuum than the other three (maybe 20% more in both directions), but the other three matched each other very closely. At first I thought it was tool. so I switched the hoses around and tried it again on a different channel, the same cylinder gave the wider range.

I have no idea why, maybe it breathes easier? could it be related to the tech manual stating to adjust that one first? Any thoughts?

now if I could only keep my helmet on without coughing a lung up onto the visor

 

[mcatrophy]

Did you switch the hoses at the tool end or the vacuum port end?

 

[Makuna]

Did you switch the hoses at the tool end or the vacuum port end?

at the port, so the hoses wouldn't be a factor.

 

[VanHarlan]

I'd be curious to see how it read after doing the "Unauthorized Throttle Body Sync" in which you sync the butterflies first . . .

Unauthorized TBS here: https://www.fjrforum.com/forum//index.php?showtopic=23101&hl=throttle+sync

 

[tyronewildman]

In the 60k mi+ on my ’04 I only did a TBS 2 times and it made a slight change, but I’m not sure it was worth the trouble. After all, you are just adjusting the smoothness at idle, right? Both times I had to adjust the idle speed.

I had already decided to not do any TBS on my ‘2013 but now that we know that the shop has to adjust the idle with a puter, I know I’m not going to mess with a TBS.

What say you?

Later,,,De