Originally Posted by heckfrozeover

Trying to set baseline before starting Smart Tune.

I pulled the file from my VCI, and in Tuning Setup (Working) it's set for 107.3 CID. (Stage 1 file 044AAO003, original setting is 103.3).

Any ideas why a dealer would set it like that, and how that affects tune if the engine is actually 103?



More information about the bike, in case it's needed:
2012 SG, 103 with performance air cleaner and V&H Monster Rounds. Bike was purchased at just over a year old, with 300 miles on it (personal sale). It's got a few thousand now, with no issues that I'm aware of. Runs and rides fine, no hesitation or decel popping.

I called the dealership where the bike was purchased, but they didn't have specific records. Purchase invoice shows all the parts but no dyno tune, so assuming this was a somewhat generic flash.

Originally Posted by harleytuner

If the tuner ran out of adjustment on the VE tables he would raise the C.I.D. to allow more room to adjust. Take a look at your VE tables both front and rear and see if there are any cells up around 120. If there are then that's your answer. It's not uncommon to have to do this.

Originally Posted by peg20

I'm guessing that they discovered that making this changed caused a blanket enrichment (somewhat like having xieds) and cured some problem or other that a customer or two had, without really understanding the consequences.

Originally Posted by peg20

If I were you, I'd ignore the tune on the bike, and start from scratch -- open one of the canned tunes by using the filters to match your hardware as close as possible. Then start Smart Tuning from there.

Originally Posted by peg20

Upping the cylinder size will have an immediate effect of adding more fuel (as it thinks that there is more air) but the O2 sensors will work against it, building up an AFV that will counteract the cylinder size increase.

Originally Posted by peg20

you can get reversion, especially on very short or open pipes

Originally Posted by peg20

deviating from the actual engine size could have unknown side-effects.

Originally Posted by heckfrozeover

Thanks harleytuner, that make sense. In this case, though, the VEs range from 71 to 96, and the table lets me raise any of them to 127.5. So, lots of room to adjust upward if needed.