Lean Condition
Lean Condition
I recently switched out my slip ons to something a bit less restrictive. Cat still remains in the head pipe. And I also recently switched to a K&N Filter but the stock intake has remained. I ride 12 FLHTP Electra Glide Police, and noticed today ( hot and humid) that the bike was surging at 30-35 in 3rd gear and at highway speeds in 6th at or near 70. Revs were in the 2k range at 30-35 and 2500 at or near 70.
Could those slight mods made my bike run lean mixed with the heat ?
Could those slight mods made my bike run lean mixed with the heat ?
Tourer
Joined: Jul 2017
Posts: 310
Likes: 58
From: UAE
I don't know if your current mapping was critical or not and you drive already on the leaner side of the AFR-range, but lets assume it is:
You have changed the amount of air going in to yr cylinder by an K&N A/C
=> VE increase.
And the exhaust restriction has been reduced by slip ons => potential for a higher VE .
If you were already running on a "bit" lean, you will now definitely be running lean. So yes, you will need to tune your bike to get ECM adapted to the mods you have installed. Both mods have an effect on the amount of O2 which is available in your cylinders for combustion.
You have changed the amount of air going in to yr cylinder by an K&N A/C
=> VE increase.
And the exhaust restriction has been reduced by slip ons => potential for a higher VE .
If you were already running on a "bit" lean, you will now definitely be running lean. So yes, you will need to tune your bike to get ECM adapted to the mods you have installed. Both mods have an effect on the amount of O2 which is available in your cylinders for combustion.
Tourer
Joined: Dec 2013
Posts: 472
Likes: 59
From: farmington ny
for min. mods the XIED'S work great,runs cooler better throttle response.2 plus years with mine and still going strong.
and I don't need to adjust them ? I guess I should put the stock airfilter element back in until these show up then.
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Tourer
Joined: Jul 2017
Posts: 310
Likes: 58
From: UAE
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it isn't staged 1. stock housing OEM style filter element changed to the K&N stock air filter element. Funny i did this same thing to my Yamaha and hadn't exeperienced any issue...I guess the HD's fuel systems are not as flexible.
Slip ons with cat and a stock filter changed and now this thing runs like crap....SMH
Slip ons with cat and a stock filter changed and now this thing runs like crap....SMH
Tourer
Joined: Jul 2017
Posts: 310
Likes: 58
From: UAE
Don't look at the name "Stage I". There have been some mods so there is nothing wrong that you will need to update the mapping. It will make your bike run much better and let fully enjoy the performance increase.