Spent a fun and informative day in the dyno booth with Dave (former owner of JD's Cycleworks) yesterday. We spent about 6 hours working on the tune. It's close, but not quite there yet. The initial numbers are 109hp/115tq. We feel there's a bit more to be had.
The componentry:
- CVO 110 motor
- Chisel air cleaner
- Andrews 57 cam
- .030 head gasket
- HPI 55mm throttle body
- Axtel oil bypass system
- Torrington cam bearing upgrade
- S&S Premium lifters
- S/E pushrods
- Jackpot coated X-pipe
- Full-size cross-under
- S/E Fatshotz mufflers w/closed caps
Random Musings:
- More throttle body noise from the cam than I expected. It's not horrible, and I suppose I'll get used to it.
- Top-end noise is nonexistent.
- There's a nasty dip in the torque curve at 3,000rpm. Dave's thinking that the flow is backing up due to the closed caps on the mufflers. I'll bring the open caps I have next week to see if that makes a difference.
- Dear God it's quiet. I was running 15 discs w/closed caps with the 255s in there. That was right at the limit of how loud I wanted. With 20 discs now it's far quieter than it was. I'm thinking that 10~12 discs and open caps might be the solution to the torque dip and maintain the quiet I want.
- There's been a lot of talk about proper O2 sensor placement on various head pipes. Certain people have mentioned that the Jackpot has issues with placement and therefore presents tuning problems. I'm happy to report that those people are wrong. We checked the A/Fs with widebands in the 18mm bungs and with sniffers in the pipes, and the readings were identical. Another myth busted.
- It runs well. Really well. It spools up quickly and smoothly without peakiness. Just a steady rush of energy pushing me back in the seat.
Overall, this is a great touring combination. Cylinder pressure is low, so it won't be fussy about fuel and it's easy on the crank. It's nice and quiet, so it won't wear me out on a 12-15 hour ride. No, it's not an insane powerhouse build, but that's fine. It's a fun, reliable, non-tempermental combination that'll get me down the road without sounding like WWIII. I know I'm leaving power on the table with the mufflers, but I value my hearing more than a dyno sheet I can brag about.
More to come next weekend when we finish it up.