Topic: 836 dyno tuning, with scan.

[mlinder]

The dyno sheet I didn't post showed peak power at 8250, so that's where I shift unless things change. The tech told me his machine would show lower numbers than say a Dynojet, but I am more concerned with mid-range torque anyway. When I squared up that 41a my lobe centers were low so that might have something to do with it.

Pods are a PITA in my opinion and I would not use them for my daily driver. I can assume my Mac 4-1 is not the most efficient. I plan on a Yoshi replica exhaust when I can afford it.

I wasn't suggesting you go with pods. I was suggesting upping the mainjets and using the velocity stacks built in to the stock airbox, with half the box removed and sans filter just to see if you are having resistance issues. The fact that you are running 115's means there's lots of vacuum there, meaning there are some pretty big restrictions going on.

It would just be interesting to see the power differences, if any. Like I said, I'd personally probably degree for a little more top end. With that fat powerband you have, you'd hardly notice the loss there, and the top end would be real fun (which is where these motors sound and feel so beautiful, in my opinion..) 

[johnyvilla]

I have an extra air-box that I might try drilling, and I could pack my can with straight-through fiberglass. Unfortunately I don't have a whole lot of time to spare. 50hr work weeks, a two and 4yr old, college, band practice and a whole exterior restoration of our 1850's home starting next month, are keeping me just a little busy. The only time I have to wrench is when my family is asleep. That's why I opted for the dyno once I got my jetting close enough. I just wish I had enough time while I was there to do a few more runs.

[scondon]

Since you have an extra air box, drill it. Just the back of the bottom half, then swap it in. Should be quick and easy. With your K&N filter you should have a noticeable improvement in the midrange through WOT. At least that has been my experience with nearly the same set up.

[johnyvilla]

I should have drilled the thing to begin with. Do you suggest I drill the heck out of it and start over with jetting, or just drill enough to remedy the richness with 115s in place? How many of what sized holes did you use?

[MRieck]

I should have drilled the thing to begin with. Do you suggest I drill the heck out of it and start over with jetting, or just drill enough to remedy the richness with 115s in place? How many of what sized holes did you use?

I have used 1/2" holes. I'd start with 10 or 12 holes.