Tuning
Outstanding HDF Member
Joined: Jul 2010
Posts: 2,727
Likes: 6
Replaced my totaled FXD with 2013 FLH Classic.
Was going to put K&N air filter on but told by dealer I would need to retune the engine. Anyone know if this is true? Harley makes EFI engines for anywhere in the country. Denver to Miami with considerable air difference between the two. Wouldn't the on board controller automatically adjust?
Why would a retune be necessary on a computer controlled engine?
Anyone have any thoughts to share?
This is a new one for mr!
Was going to put K&N air filter on but told by dealer I would need to retune the engine. Anyone know if this is true? Harley makes EFI engines for anywhere in the country. Denver to Miami with considerable air difference between the two. Wouldn't the on board controller automatically adjust?
Why would a retune be necessary on a computer controlled engine?
Anyone have any thoughts to share?
This is a new one for mr!
Stellar HDF Member
Joined: Sep 2007
Posts: 2,469
Likes: 679
From: Vancouver Island B.C.
That's an internet myth.
Outstanding HDF Member
Joined: Jan 2010
Posts: 2,916
Likes: 31
From: earth
I'm not trying to sell you a tuner, but I can tell you that any change to intake and/or exhaust affects your AFR, the ECM has a very narrow range of adjustment, and without O2 feedback its anyone's guess whether or not you need a tune after the change. Sorry I can't help to reinforce the popular belief, but I've been tuning by O2 analysis for several years so thats where my "opinion" comes from. It may very well be "ok" without a tune, but each bike and configuration is a little different so you won't know for sure without validation by sniffer.
Elite HDF Member
Joined: Apr 2007
Posts: 3,766
Likes: 16
From: Roseville, CA
EFI allows for precise fuel control allowing for more hp, better mileage and a better running motor with lower emissions. However the factory tunes it pretty conservatively.
All cars are FI since '91 iirc. And even performance models benefit from dyno tuning.
It's a good idea for the bike if you make some modifications. Fuelmoto, Thundermax, etc.
All cars are FI since '91 iirc. And even performance models benefit from dyno tuning.
It's a good idea for the bike if you make some modifications. Fuelmoto, Thundermax, etc.
Seasoned HDF Member
Joined: Dec 2007
Posts: 8,341
Likes: 714
harley tolerances are all but tight including electronics,and the range of adjustment is small,so bad that i would be willing to bet if ya put 2 stock bikes on a sniffer u would get 2 COMPLTLEY different readings.
Tourer
Joined: Jul 2012
Posts: 416
Likes: 24
From: Dubuque, IA USA
It is my understanding that the tuning is recommended to properly dial in the VE (volumetric efficiency) tables. The VE tables tell the rest of the system how much air is going through your motor. The system then uses this info along with the O2 readings to dial in the AFR.
This being said, it is also said that changing just the air cleaner is not that big a deal. It is when you change both the air cleaner AND the exhaust that volumetric efficiency really changes.
This being said, it is also said that changing just the air cleaner is not that big a deal. It is when you change both the air cleaner AND the exhaust that volumetric efficiency really changes.
Seasoned HDF Member
Joined: Oct 2012
Posts: 11,232
Likes: 3,054
From: St.Louis Mo.
what about no cat, free flowing mufflers and fl-vied-10.runs pretty good right now,but would like to add a/c.what do you guys think?
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Elite HDF Member
Joined: Apr 2007
Posts: 3,766
Likes: 16
From: Roseville, CA
As already stated, get it tuned/tuner.
