also this kit comes with the 58mm throttle body right?

 

LA Dog yea typo meant dialing in and yup that's right 58mm throttle body.

 

ok thanks- so who is trying to tune it and what tuning product you using?

 

My mechanic local guys but lots of experience and I believe the SE supertuner that came with the kit.

 

ok well I'm going to PM you the contact info of a member here who really knows his shizz with tuning. PM or email him directly and he'll hit you back. super nice guy.

the main problem you are going to have is with the 58mm TB. it is plain too large for a 103" motor. It should be a 50mm up to a 52mm max. The larger flow injectors are GOOD, the large diameter TB is not. Now I know you already got it so it is possible to tune it, but it will take experienced hands and not some average shop to get it right.

Look t it like this- your stock TB was 46mm, or if a 2016 then 50mm. that is a good of air for most street bikes and mild builds. with your build, going slightly larger on the TB is good. but too large is not.

58mm TB will only make the small throttle positions more sensitive, which in turn makes the "Drivability" of the bike less desirable and tougher to dial in.
Will it cause more power? No - Will it take away throttle response? No. Will it mess with low end TQ? possibly.
Tuning is tough because inherently it will make the bike harder to ride smoothly. With the 46mm TB it may take an eighth of a turn on throttle to get the bike moving whereas with 58mm it may only take half that - one sixteenth- turn of throttle to do the same thing. That is the same situation for the TPS (throttle position sensor), which is basically a rheostat/potentiometer that has so much resolution per movement of throttle.

But again, don't fret because it can be tuned. the above is just for your knowledge. You may need a better tuning product like the PV or TTS though, and more than likely a good experienced dyno tuner to get it set up to your satisfaction.

 

Yes, totally agree about the throttle body, and Mike Lozano, the truly (no exaggeration (Google Lozano Brothers) world class tuner who tuned mine bike with its Stage 4 Race kit finally, and got it RIGHT, says the valves close too late too with the 259 cam.

But MIke knew how to take care of all that. The "B" (balanced) engines show significantly lower power on a Dynojet dyno, since the balancer mass is a bear to accelerate, and Mike says that big rear tire really cuts the displayed pwoer by another 3 or 4 rwhp for same reason. But Mike got almost 107 rwhp out of mine, AND, here's the great part, he also got the low end remarkably strong for that cam. In fact, it runs so well at low rpm that when I am not paying attention, I accidentally let it get down to 1500 rpm and it still doesn't complain and actually accelerates from that rpm without issues. Mike got my torque curve remarkably flat given the timing of the cam and the size of the throttle body. He also got the warmup cycle dialed in perfectly - the engine starts instantly when cold, even real cold, and runs properly right away - no coldbloodeness. Get your bike to a really good tuner. By the way, I had Mike user the Powervision tuner when doing my tune.

Jim G

 

Well there ya go, JimG to the rescue Jim, can't recall, do you have the 103 or CVO 110 motor? Did you keep the 58mm or go to a smaller TB?

Tex- this is going to be the same type of tuning process and expertise needed to dial in your bike.

 

Tex, the paint is incredible!

 

I have the 103 engine, and the 58mm throttle body that came with the Stage 4 Race kit. I also have the D&D exhaust.

Here's the dyno chart from Mike Lozano's dyno:




Notice how the torque curve has a perfect shape - no bumps or dips, especially when you consider the cam specs and the throttle body. Notice how prolonged the "peak" in the torque curve is, and how the engine does not run out of air before the mechanical limitations of high rpm with a B engine stop the fun. The D&D exhaust is a really good match for the Stage 4 Race kit evidently.

Here's the bike (a lot more stock than yours!):





Jim G

 

Thanks Jim / LA Dog for the info. I'm going to hit up Mac and see if he can help me with a starting map and then call LB for their suggestions. Appreciate the help!

And cdonis thanks for the compliment. Uncle Ds Airbrushing. Great artist and very affordable. People from all over North America ship him their tins for some love.