Ok... my wife dislikes the stock air cleaner housing on her new 21 standard and wants to go with the SE Ventilator air cleaner. The directions state: “You must recalibrate the ECM when installing this kit. Failure to properly recalibrate the ECM can result in severe engine damage. (00399b)”. Seriously??? Is that even needed with no other modifications to a stock 21 standard?

 

Yes. The fueling only runs closed-loop at cruise conditions. Heavy throttle and acceleration are open loop. The volumetric efficiency maps must be updated to avoid overly lean conditions.

 

What if I replaced the SE oiled air filter with a unoiled paper one. Still need a remapping?

 

Then you won't know what you have.

If you plan to keep your warranty intact and keep the powertrain stock, just have the dealer install the air filter and flash the ECM with the proper tune. No need to buy a tuner. Tuning files for H-D components are developed at the factory and the bike will run well.

 

Filters can swap without a tune, upgraded back plates need the tune.

 

Interesting cause this thread below and data from DK Customs seems to disagree?

https://www.hdforums.com/forum/milwa...g-a-tuner.html

 

Swap it out, run it, then decide if you need a tune or not.
Question would be what else you going to upgrade. Exhaust would be plus, and add a tuner.

 

I decided not do exhaust after doing air cleaner as I could tell that it would definitely need a tuner because it greatly increased throttle response.

There is a video on youtube by "Travelling Tall" where he goes to Zippers and discusses this with the gentlemen who designed the 468 cam.

The conclusion is any upgrade requires a tune to get the best out of it.

 

The data from DK Customs can be seen here:
https://www.dkcustomproducts.com/mil...-dk-m8-rpt.htm

 

Very interesting. Thank you!