Will the base map for the SE255 cam be the best starting point?

 

No a map for a TW-222 will be the best starting point

 

The super tuner doesn't have base maps for cams Harley didn't make. So any other bright ideas?

 

Ive got S&S 510 cams and use the map for 204s. I just googled the specs and picked the closest one.

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Yeah. Find the map that best corresponds to the specifics of a cam that has the same or nearly the same profile and start from there.

 

The cam specs, I see that's a great plan thanks!

 

It looks like the SE204 is the closest match to the TW-222. I will give it a try and get back with results as soon as the weather here improves a little.

 

Unfortunately cam timing is only one of the big variables that have a large effect on tuning.
The other variable that makes a big difference to the tune is exhaust.
If the exhaust you have is similar to the one the cal was written for you have a 50/50 chance the canned cal will be somewhat close.
If the exhaust design is fundamentally different the calibration will be different as well.
Bob