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Auto tunes are cool, but no matter how much you tweak 'em, they just cannot hit every cell in the VE TABLE (Volumetric Efficiency) The Delphi ECM that The Motor Co. installs on our bikes from the factory has a (quite amazing) "auto adjust" feature built in. Any "GOOD" dynamometer Operator can use this to his advantage while tuning. The ONLY way you can alter ALL of the cells in the VE Table is via a dynamometer run ....or RUN(S). But you have to have a highly qualified Dyno Op. with a HIGH QUALITY currently calibrated dyno that also is equipped with TWO "Sniffers" for front AND rear cylinders.
Doc did a total of 15 runs with my bike. It was on the dyno for 6 hours+. He was adjusting and altering the TTS "canned for my particular upgrades" tune the whole time. By the time he was finished, he was able to extract 12.33 more HP & 16.65 more TQ from the "already excellent" canned tune. That, right there, made it well worth the dyno investment...
But most importantly, my bike runs so smooth, that it amazes me.
I can now let my clutch out at dead idle (zero throttle) and there is absolutely NO STUMBLING or HESITATION. I can then, either slowly twist it up to speed, or slam it all the way to just pass "factory" redline in every gear and it feels like a Ferrari V-12! (....and yes, I've driven one of those.) My lil' 'ol Street Glide is my fun little "sleeper" now. No cams, No head work. I never divulge my full numbers. It makes it more fun that way. Plenty fast enough.
...Besides, if I REALLY wanna' go faster, I have another little red "bagger" bike that'll do 0 to 60 in 2.9 seconds and a 10.59 in 1320 ft. on 87 octane ethanol with the saddle bags on. I live 21 minutes from Palm Beach Int'l Dragway and rarely miss a Friday night "test & tune".
If you have the time, check out harleytuner.com This is a site operated by Mike Daniels. Mike does a good bit of consulting and contract work for HARLEY-DAVIDSON MOTOR COMPANY, as well as performance oriented aftermarket companies like V & H, Rinehart, and many more. There is a terrific piece on there titled "Which tuner should I buy". I believe it even discusses AUTO-TUNE equipped tuners in a fair and balance way.
Stay safe,
Rusty