DYNOJET: Tuning cams
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Road Warrior
Joined: Feb 2012
Posts: 1,935
Likes: 90
From: Charlotte
Tuning cams
Gang, please help me to understand how to tune cams.
I do have a Powervision which I bought when I did exhaust. For my 2012 SG, I installed CFR's and V&H Power Duals. It took a long time but I was finally able to tune and flash.
I'm getting ready to pull the trigger on Andrews 57 cams. The installer, Kendall Johnson strongly suggests that I let them tune the bike.
Assume that I didn't: 1 - Would I use the same map that tuned my exhaust?
2 - Would I loose anything on the exhaust when I tune for the cams?
3 - Would the exhaust have to be re-tuned?
4 - After installing cams, how does one know when the bike is fully tuned? Is it simply running auto-tune?
I had a tough time tuning with the CFR's. Fuelmoto's suggestion of tuning didn't work with my CFR's. I had to run 4 -40-60 minute sessions to get the CFR's to where I like.
Now, I'm wondering what the actual process is with Cams?
Any recommendation? I'm really leaning on letting Kendall Johnson do the tuning. They're one of the best in the country.
I do have a Powervision which I bought when I did exhaust. For my 2012 SG, I installed CFR's and V&H Power Duals. It took a long time but I was finally able to tune and flash.
I'm getting ready to pull the trigger on Andrews 57 cams. The installer, Kendall Johnson strongly suggests that I let them tune the bike.
Assume that I didn't: 1 - Would I use the same map that tuned my exhaust?
2 - Would I loose anything on the exhaust when I tune for the cams?
3 - Would the exhaust have to be re-tuned?
4 - After installing cams, how does one know when the bike is fully tuned? Is it simply running auto-tune?
I had a tough time tuning with the CFR's. Fuelmoto's suggestion of tuning didn't work with my CFR's. I had to run 4 -40-60 minute sessions to get the CFR's to where I like.
Now, I'm wondering what the actual process is with Cams?
Any recommendation? I'm really leaning on letting Kendall Johnson do the tuning. They're one of the best in the country.
Tourer
Joined: Feb 2016
Posts: 377
Likes: 74
From: Western New York
You don't tune just the cams, or just the exhaust. It is the combination of all parts working together that you're trying to tune. You can likely find a basemap that might be close to what you have and you can run the auto-tune sessions, but you'll never be "fully tuned." If you have a good tuner that can put your bike on a dyno and dial it in, it will be better than all of the tuning sessions that you do, no matter how many times you do it.
Any time you change the way the bike breathes (air in - exhaust out) the bike needs tuned. by adding cams and retaining all the other upgrades you already did you are indeed changing the way the bike breathes. So yes, you will need to re-calibrate the VE's and with the addition of the cams you should have the ignition tables addressed as well. If you struggled with calibrating the VE's with your pipe you would probably be better off having the guys at KJ do the tune. I've heard nothing but good about them.
Grand HDF Member
Joined: May 2008
Posts: 4,624
Likes: 189
From: Newcastle, Ca.
Consider using the money saved not paying for a tune and get some good, proven, performance mufflers. Crusher Mellows, Fatshotz, Fullsac baffles work well with 57's in a 103". If you decide to use your PV and not pay for a tune, my PCV map should work for you. Dynojet will convert the PCV to a PV for free. PM if interested in details.
Cruiser
Joined: Aug 2016
Posts: 232
Likes: 59
From: Round Rock TX
Yes you need to have it professionally tuned. I can tell by your post you have no clue about how the Harley fuel injection or engine works and there is nothing wrong with that. I am sure I have no clue how your field works that's life.
The maps Dyno Jet or FM or any other tuning module provide you with are starting maps and only starting maps. When I first started tuning Harleys I had a his and hers build going they both had the same bike with the same everything on them from exhaust to cams and a/c only difference was the color. I tuned her bike first then loaded her map into his bike and ran it thru all the break points of the calibration so I could see if there was a difference then I watched all the data I logged only to find out there was and is a huge difference. So I tuned his bike and compared the final maps from both bikes to see how much of a difference in the maps there was and it was quite a bit. I have don't tests like that a couple times over the years and it still amazes me how different every bike is but you need to keep in mind there are a lot of variables to properly calibrate a engine any engine there is not nor will there ever be a one fits all calibration because of machining tolerances in the engines and the amount of air going in and out of the engine that is restricted from the air cleaners and exhaust and it gets a lot deeper then that but every bike out there can benefit from a proper dyno tune especially one with cams installed or greater. Maps are like Finger Prints no two maps are the same.
The maps Dyno Jet or FM or any other tuning module provide you with are starting maps and only starting maps. When I first started tuning Harleys I had a his and hers build going they both had the same bike with the same everything on them from exhaust to cams and a/c only difference was the color. I tuned her bike first then loaded her map into his bike and ran it thru all the break points of the calibration so I could see if there was a difference then I watched all the data I logged only to find out there was and is a huge difference. So I tuned his bike and compared the final maps from both bikes to see how much of a difference in the maps there was and it was quite a bit. I have don't tests like that a couple times over the years and it still amazes me how different every bike is but you need to keep in mind there are a lot of variables to properly calibrate a engine any engine there is not nor will there ever be a one fits all calibration because of machining tolerances in the engines and the amount of air going in and out of the engine that is restricted from the air cleaners and exhaust and it gets a lot deeper then that but every bike out there can benefit from a proper dyno tune especially one with cams installed or greater. Maps are like Finger Prints no two maps are the same.
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