Originally Posted by perfectbonnie
I have been following all the intake-side discussions and am considering the next step in opening up the airflow. My concern is that I don't want to upset the apple cart. I've got my 2008 Bonnie Black dialed in so it runs great - from idle to top end, with no flat spots. My set up is Dominator Touring pipes, rejet per Carlos at TPUSA, and removed snorkel. I'm not ready to remove the airbox, but was considering removing the baffle in the airbox.
Question from those who have done these type of mods: Am I risking losing low end smoothness and performance by doing this? Will it require another rejet?
Here is a dyno run i mentioned. It is very lean but certainly demonstrates that you will only gain in tractability. This was with a 130 main. The reason the jet is so lean is the difference the inlet hole makes when opened up to max dia( snorkel hole) and baffle removed. The surface area is 50% more if i remember right. I ended up with a 138 and a shim. Modded this way you are getting right up to pod territory for change outta $30 incl postage!
The baffle when removed makes for a whopping big hole compared to the little slit!
The bit in red (thanks to forchetto in teaching me how) is what you have as a hole. I appreciate it is blocked but it now an ARK. The bit in blue is the baffle so i estimate the hole is 300% bigger.
You will definately have to rejet. Also it is better to be richer than leaner.