Speedo Calibration after 30/70?
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Cruiser
Joined: Mar 2010
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From: Westerly, RI
Speedo Calibration after 30/70?
I just recently (pretty much) finished the upgrades to the drive train on my Fat Bob... 30/70 pulleys, basically everything in the cam chest, SS 106, Fuelmoto Heads... anyway, I have found a thread that recommends calibrating the speedo using the Dakota Digital electronic speed adjustment module... The website says it will work with my bike, but needs to be "hard wired'. Also, it says something about only being able to adjust a stock harley speedo 3-5%, which I am not sure will be enough... don't have a "stock" speedo, because I replaced it with the speedo/tach combination model, but I assume since it is a harley speedo, it has the same limitations.
I have a PCV under the seat, and am wondering if perhaps when I bring it to the dyno, there is a way to calibrate the speed without adding another piece of electronic equipment? I don't even recall what I paid for the PCV, but the dakota adjustment module would cost around $150.
I have been fantasizing about replacing the PCV with something else that might have the capability of speedo adjustment built in, along with any other benefits? I must say, that I have not purchased an auto tune module, not because of the cost, but because I am not a computer guy, and when I read the threads from guys using these things, they use a lot of words I don't understand.
I would appreciate feedback from people who have resolved this issue.
I have a PCV under the seat, and am wondering if perhaps when I bring it to the dyno, there is a way to calibrate the speed without adding another piece of electronic equipment? I don't even recall what I paid for the PCV, but the dakota adjustment module would cost around $150.
I have been fantasizing about replacing the PCV with something else that might have the capability of speedo adjustment built in, along with any other benefits? I must say, that I have not purchased an auto tune module, not because of the cost, but because I am not a computer guy, and when I read the threads from guys using these things, they use a lot of words I don't understand.
I would appreciate feedback from people who have resolved this issue.
Outstanding HDF Member
Joined: Dec 2008
Posts: 2,419
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From: Ashland Ore.
My suggestion is to dump the PCV and switch to a TTS MasterTune......It's a much better tuner for your motor upgrades and the speedo can be calibrated with it. No having to buy the Dakota digital. JMO
Elite HDF Member
Joined: Sep 2012
Posts: 3,791
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From: N Texas
The Power Vision will work too, just adjust the VSS number: 2/32 + 4/66 = .0625 + .0606 = .1231, so about 12%. I did this for my 30T, cannot remember if I added or subtracted - just used a GPS, first time I guessed wrong, so then I did the opposite and it was dead on.
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Cruiser
Joined: Mar 2010
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From: Westerly, RI
Also, I don't have a PC I have a Mac.
I appreciate any additional advice.
Thread Starter
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Cruiser
Joined: Mar 2010
Posts: 198
Likes: 0
From: Westerly, RI
The Power Vision will work too, just adjust the VSS number: 2/32 + 4/66 = .0625 + .0606 = .1231, so about 12%. I did this for my 30T, cannot remember if I added or subtracted - just used a GPS, first time I guessed wrong, so then I did the opposite and it was dead on.
If I get my hands on a PC, does that I mean I tune the bike? Is it simple enough to figure out how to do even if you have no idea what a VSS is?
Thank you for your response. Your post about the 30/70 is what got me going in the first place, so I'm not sure if I should thank you or curse you, LOL. I did manage to get it done right on my own though, and for that I definitely thank you.
Elite HDF Member
Joined: Sep 2012
Posts: 3,791
Likes: 57
From: N Texas
Thanks Alan, does the powervision replace the the PCV or work with it? Not really sure what a VSS is, or how to adjust it... I always have the bike tuned at a shop though, and I don't have a PC.
If I get my hands on a PC, does that I mean I tune the bike? Is it simple enough to figure out how to do even if you have no idea what a VSS is?
Thank you for your response. Your post about the 30/70 is what got me going in the first place, so I'm not sure if I should thank you or curse you, LOL. I did manage to get it done right on my own though, and for that I definitely thank you.
If I get my hands on a PC, does that I mean I tune the bike? Is it simple enough to figure out how to do even if you have no idea what a VSS is?
Thank you for your response. Your post about the 30/70 is what got me going in the first place, so I'm not sure if I should thank you or curse you, LOL. I did manage to get it done right on my own though, and for that I definitely thank you.
I cannot even remember what VSS means, does not matter but it is a number that can be accessed on the PV itself(no PC needed). My number was around 3200(I think), so my change for the 30T was ~ 6% so I knew the VSS needed to go up or down 6% of 3200. So I tried one way > wrong, then the other way > perfect.
The PV is a separate tuner from the PCV, but I think you can import PCV maps to use on the PV. To get the most out of a PV, you really need a computer to view/adust all of the parts of your tune. That being said, if you want to keep it simple, you could just plug the PV on your bike and do a couple of Autotunes and then take it off and be done, but I think getting familiar with your tune on a computer is very worthwhile.
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