Page 1 of 1

Unbalanced the throttle bodies

Posted: Tue Feb 26, 2019 10:58 am
by windmill
Through experimentation and observation I've found my rig idles smoother, hunts less, and doesn't do the occasional off idle skip as often if I have the left cylinder 1 HG lower than the right. I talked to Jason Rae about it and he said it could just be a small anomaly in my OBD2 tool, the rigs system, or that my rig is just happier that way for some reason. Being such a small difference, it's not an indication anything is wrong, and its not unusual.

Unfortunately I was there working and didn't have my rig, but he offered to check it out with their more sensitive and accurate equipment to see if its actually unbalanced, or if its just reads that way.

Re: Unbalanced the throttle bodies

Posted: Tue Feb 26, 2019 11:43 am
by hotflash44
do you have the OBD2wiz? let us know if there is a difference in instruments. :cheers:

Re: Unbalanced the throttle bodies

Posted: Tue Feb 26, 2019 12:05 pm
by Tomcatfixer
:lurker:

Re: Unbalanced the throttle bodies

Posted: Tue Feb 26, 2019 4:35 pm
by BlueRockCrawler
Should be an inch or mm on that measurement, not trying to nitpick, but different scales. A mmHg is a lot smaller than a inHg. I unbalanced mine and they were four hundred Pascal's apart which is only a few mmHg . Perfectly balanced idled poorly and the transition just off idle was rough. I figured that one of the TB's MAP sensors were just off. Someone correct, but I seem to remember that spec is up to 6 percent difference?

Edited for terrible grammar: There should be a "me" after "Someone correct"

Re: Unbalanced the throttle bodies

Posted: Tue Feb 26, 2019 5:18 pm
by gobium
Darrell to bat phone.

Re: Unbalanced the throttle bodies

Posted: Tue Feb 26, 2019 9:23 pm
by windmill
BlueRockCrawler wrote:
Tue Feb 26, 2019 4:35 pm
Should be an inch or mm on that measurement, not trying to nitpick, but different scales. A mmHg is a lot smaller than a inHg. I unbalanced mine and they were four hundred Pascal's apart which is only a few mmHg . Perfectly balanced idled poorly and the transition just off idle was rough. I figured that one of the TB's MAP sensors were just off. Someone correct, but I seem to remember that spec is up to 6 percent difference?

Edited for terrible grammar: There should be a "me" after "Someone correct"
Yeah, it's a kPa scale. At 1050 rpm idle it seems to be happiest with the right cylinder at 33 kPa, and the left at 32 kPa.

Jason Rae summed it up pretty well, "if it's running good, it's good, some bikes are just like that".