Check out the new Gallery
wicked red 1100
wicked red 1100
by mag10, August 21
Windshield I need to replace
Windshield I need to replace
by philwarner, May 10
first ride
first ride
by NemoJr, April 1
Steve McQueen inspired
Steve McQueen inspired
by Feral, November 28
GaRally22
GaRally22
by chy, September 18
Previous Thread
Next Thread
Print Thread
Should the AI be removed on EFI bikes?
#434535 03/20/2011 11:43 AM
Joined: Nov 2009
Posts: 473
hyates Offline OP
Adjunct
OP Offline
Adjunct
Joined: Nov 2009
Posts: 473
Hi Folks. I've been studying this topic for a bit, and thought I'd share my research.

Yes, the AI can be removed in much the same manner as the carb models. Just don't remove any hoses from the throttle bodies!

TuneECU can be used to disable the MIL engine light if the AI electic solenoid is removed. So far so good.

The doubtful point is dependent on what market your bike has been made for. EFI bikes have oxygen sensors in each header pipe. They can be disabled in TuneECU as well. It is recommended to remove the O2 sensors and install a plug if you are going to disable them. O2 sensor plugs: M12x1.25 pitch.

The gotcha is for those of us that have catalytic converters in the header pipes. From my reading, the North American headers and exhaust pipes have the catalyzers.

If the AI is removed, it will be putting out a richer air/fuel ratio which will eventually plug up the catalyzers.

It is fair easy to tell if the exhaust pipes have the cats in them. Look for this weld seam:



I just put on long TORS on my 2010, and it has the cats in them as well, and is a 'see through pipe'.

So, in conclusion, it might be more of a problem to remove the AI from EFI models. My personal take is to sit this one out and see. I should state that not too many people with EFI bikes seemed to be concerned over this, just me

For an in-depth read on this topic, please go here

Please note that with the advent of TuneECU, the use of a resistor to fool the ECU is NOT REQUIRED. The thread above has been updated to reflect that.

I should also add that I'm no expert here. I'm just trying to relay this information to this group. If I've missed something, please share.

H.

Last edited by hyates; 03/20/2011 1:42 PM.
Re: Should the AI be removed on EFI bikes?
hyates #434536 03/20/2011 8:26 PM
Joined: Mar 2005
Posts: 2,419
Oil Expert
Offline
Oil Expert
Joined: Mar 2005
Posts: 2,419
Good summary Hyates. Removing the Cats is a choice that many have made (but it is not recommended if your cats are in your headers). In my case the cats were in the silencers which I replaced with straight-through Staintunes from new. I have not encountered any issues at all running without Cats - nor have I heard of any.

Quote:

So, in conclusion, it might be more of a problem to remove the AI from EFI models.




This is not my experience. I have been running with AI removed and O2 sensors turned off for 18 months without issue (I have a resistor in place of the AI solenoid). I know of at least 6 people doing the same - all with no problems. I am not saying there is no possibility of an issue occuring - just that there haven't been any to date. Just to be clear for others reading this -You should remove any cats if you are removing the AI - as Hyates has already warned.


Cheers, Richard
~~~~~~~~~~~~
09 America, Staintune Pipes, K&N, Breathe, Hagon Nitros, AI & O2 removed, tune 20184 (modified), MTX-L a/f gauge
Re: Should the AI be removed on EFI bikes?
foglefar #434537 03/20/2011 8:44 PM
Joined: Nov 2009
Posts: 473
hyates Offline OP
Adjunct
OP Offline
Adjunct
Joined: Nov 2009
Posts: 473
Thanks for clarifying Richard. As my bike is a North American (Canada) spec, I'm fairly sure that there are catalyzers in the header pipes as well as the mufflers. I am unaware as to how to check for the cats in the header pipes other than shoving a hose through the pipe to see. The mufflers are easy. See pic above.

The TORS I just put on are 'see through', and with catalyzers. I don't think I would be too worried about those, but the header pipes would be a problem if they had the cats in them for sure.

I'd like to remove the AI, but until I can be sure about the header pipes, I'll wait.

H.

Last edited by hyates; 03/20/2011 8:45 PM.

2010 Speedmaster Black/New England White

Moderated by  bennybmn, chy, mert 

Link Copied to Clipboard
Rides
2025 Arkansas Rally
by roadworthy - 04/24/2025 7:57 PM
Powered by UBB.threads™ PHP Forum Software 7.7.4