Is a fuel management system needed with new intake?
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3rd Gear
Joined: Sep 2012
Posts: 7
Likes: 0
From: Cos Cob CT
Is a fuel management system needed with new intake?
Looking at the new K&N "RK" series intake for my 2012 FXDF. K&N says a fuel management system is not needed. Dealer says any intake change requires a FMS.
Road Captain
Joined: Sep 2011
Posts: 508
Likes: 2
From: Idaho Panhandle
Hmmm, probably get away with it without tuner, but with the sloppy manufacturing tolerances on Harley's, it's a crap shoot on how well any individual bike will run with intake or exhaust changes and no tuner. For sure it will still run lean and hot, exhibit 'hunting'- ie, the ECU will constantly try to keep the AFR in the desired range when running in closed loop ( many people think this is lean surging, but talking to guys with SERTs and TTSs who collect ECU data with a laptop, it looks like more like the ECU 'hunting' for the preset AFR). Get something to help your bike run at a more comfortable AFR at least, even if your leaving it stock. I am really happy with the Dobeck GEN 3, bike runs good and cool, don't throw codes like it did with ViEDS, ECU is totally unaffected by the fueler, pretty easy install and set-up, and I can take it back to stock with no traces left in the ECU in under 40 minutes, all for a bit more than the ViEDS cost. Of course only works good for a Stage 1 bike, or a very mild mouse cam.
http://www.electronicjetkit.com
http://www.electronicjetkit.com
Outstanding HDF Member
Joined: Jun 2012
Posts: 2,087
Likes: 22
From: USA
Hmmm, probably get away with it without tuner, but with the sloppy manufacturing tolerances on Harley's, it's a crap shoot on how well any individual bike will run with intake or exhaust changes and no tuner. For sure it will still run lean and hot, exhibit 'hunting'- ie, the ECU will constantly try to keep the AFR in the desired range when running in closed loop ( many people think this is lean surging, but talking to guys with SERTs and TTSs who collect ECU data with a laptop, it looks like more like the ECU 'hunting' for the preset AFR). Get something to help your bike run at a more comfortable AFR at least, even if your leaving it stock. I am really happy with the Dobeck GEN 3, bike runs good and cool, don't throw codes like it did with ViEDS, ECU is totally unaffected by the fueler, pretty easy install and set-up, and I can take it back to stock with no traces left in the ECU in under 40 minutes, all for a bit more than the ViEDS cost. Of course only works good for a Stage 1 bike, or a very mild mouse cam.
http://www.electronicjetkit.com
http://www.electronicjetkit.com
Another vote for the GEN III. I just sold my XIEDs and picked up a used GEN III for very cheap. It installed in about 30 minutes and after a couple tweaks I can tell a difference over the XIEDs. I liked the XIEDs very much and had no issues but the Gen III gives you tweaking ability over the XIEDs, which is nice.
Grand HDF Member
Joined: Oct 2004
Posts: 3,842
Likes: 502
From: Northern WV
The stock ECU will acclimate to the new intake and K&N dynos claim 6-7 HP gain w/o any other mods. It will be running just as hot (and getting good mpg) as stock.
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