If 'close enough' is good for you by all means do it... I would rather the precision afforded on a dyno.

 

It's not close enough. Man I get tired of reading this. I don't know if people don't understand engine tuning and ECMs or it's guys with dynos trying to sell service.

Again I quote the guy that did the work on my heads "Oh you have a SERT like device?" Yes I do. "You can do anything with that I can do on the dyno" "You don't need me to dyno tune it". "Do this, this, and this" "The tune will be great". I did, it is, along with some help from Jamie.

 

I actually fully understand engines and ecm's... ex racer (cage not bike)... the average user will never get their tune as dialed in as a dyno, I have yet to meet anyone here who is anything but an average user.

 

I'll tell you what I have had two dyno tunes and my road tune is better than both of the tunes off the dyno.

1. I don't ping at all, ever.
2. I get right about 49 MPG at 75 MPH.
3. If I hammer the throttle in first gear I lift the front wheel.
4. I walk away from CVO 110 bikes.
6. I cruise through the mountains without ever leaving 6th gear all the way down to 60 MPH (This was the goal of my build, I wanted more touring torque).

Maybe I am leaving a few HP and a couple foot pounds of torque on the table but it's not much. Drag racing was not my goal. It was a bike that tours well and runs well. I got that in spades. The extra performance was a bonus. These Harley motors are pretty simple things to build and tune. They remind me of VW motors that I first learned how to rebuild when I was a kid. It's not like you are tuning a modern high performance V8. What makes them go is well known. There is no secret sauce. Of course if you want to believe there is fine by me.

 

I just did a similar job several weeks ago. Cams, lifters and push rods. I received a map from a forum member and honestly the bike seems to run great. Doesn't seem to get the best gas mileage but then again it seemed like it never did with the stage 1 previously.

It's going on the dyno Tuesday. I dyno guy is highly recommended so will see how it turns out. I'll post back with my results.

 

A lot of guys like taking it out of closed loop mode for performance in the cruise range which causes poor gas mileage. Keep it in closed loop mode in the cruise range and just tweak the 02 sensor bias voltage to get the AFR you desire while cruising. I set mine 02 sensor voltage just high enough to keep the heads cool going down the interstate. I run right at about 260 head temp and I'm getting 49MPG interstate cruising.

 

Then the tune's not right. Which is why it's not really smart to trust a tune from a stranger on the internet who hasn't developed the tune on a dyno.

Remember, there's much more to a tune than the peak numbers.

I'm curious to see what your thoughts are on the difference in feel.

 

I'll post back for sure. I'm curious what the results will be too. Honestly the bike seems to run great, pulls great and sounds great too.

Will it be that much better after the dyno tune? At least I'll have piece of mind it's been dialed in perfectly.

I found the dyno guy from a post here on the forum then did some local research. Seems like the real deal. He was booked 5 weeks out as well.

 

If your service manager didn't suggest a dyno tune with cam install I'd run!! Anyone insalling performance cams and not recommending a proper dyno tune shouldn't be in the business. Do some searching for a good tuner in your area and have a proper tune done.

 

Hi,
Good post FX4, these bikes not a space shuttle, and all the hype makes it easy to be a bit lighter in the wallet

Thanks
Mirrmu