Josh’s bigger throttle bodies project

[PowerDubs_imp]

Ok- some more interesting stuff to report today.

As mentioned before, I noticed that the stacks on the 36mm Tb sit on the upper lip and although our 32mm Tb have the same lip- our stock stacks go all the way down the throat of the Tb and effectively make them 26mm.


So I decided to cut off the long portion, bore out the center similar to what I had done before- but also cut them short at the same height as the lip and then heat them up and shove a socket inside to stretch it wider to mate with the lip.


Cut-






Bored-






Hard to tell in pictures, but here are more-







Compared to-







So this took quite a bit of time as I needed to measure for it to sit right on the lip correctly. Although they would probably work quite well, I was still thinking there is room for improvement.

Since Honda uses very similar throttlebody design on most of its modern bikes, I started searching to see if they used 32 mm on any other bikes and then once I found those bikes I looked at their intake horn design.

Sure enough I found factory parts to fit the same 32 mm throttlebody housing and actually sit on the inside lip instead of choking off all the way down the bore to 26mm

It is my belief these will work better than the bored out stockers, and even my shortened and stretched stockers that I have not tested yet.

In fact due to the plug-and-play nature of these and the cheap cost I would think they now make the TSR pieces obsolete.

Stock on the left, new ones on the right.




So I will be installing these which will drop right in, and then re-dyno in the spring.

Based on whatever results seen then, I will decide if I will move forward with fitting the 36 mm throttle bodies.


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