Re-Tune with Heavy breather?

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Jun 27, 2010 | 01:14 AM

PistonPuller

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From: Eastern Washington

Re-Tune with Heavy breather?

Currently have a 103 kit, Rinehart slip ons and SE air filter. Bike was dyno tuned with a SERT. I have been thinking about getting the heavy breather and wonder if I would need to spend the $300 to have it tuned again, or can I bolt it on and go with my current tune? This for a 2009 Street Glide

Jun 27, 2010 | 01:44 AM

flyingace

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I went the opposite direction on my 09. Was told "not enough difference in airflow to matter between the two, don't worry about doing a retune".

Jun 27, 2010 | 01:47 AM

PistonPuller

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From: Eastern Washington

Quote:

Originally Posted by flyingace

I went the opposite direction on my 09. Was told "not enough difference in airflow to matter between the two, don't worry about doing a retune".

Can I ask why you switched? Thanks for the reply

Jun 27, 2010 | 02:33 AM

hougz79

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From: Superior, WI

From what I've read (please correct me if I'm wrong) the Heavy Breather only makes a difference once you've eclipsed 100/100. If you are not there yet, you are "probably" ok.

Jun 27, 2010 | 10:34 AM

flyingace

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Quote:

Originally Posted by BennieSG

Can I ask why you switched? Thanks for the reply

I liked the look of the heavy breather, but after I mounted my tourpak permanently, I just didn't think it fit the look of a full on bagger. Looked great when the bike was more stripped down. Was nice to get the legroom back too. So it was just for cosmetic reasons.

Jun 27, 2010 | 07:05 PM

RK14SGS

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From: SC

Hey Bennie- you should be okay to ride, but I suspect you may need to re-tune, as more air will probably enter the air filter (like a ram air effect) at higher speeds; if so, the mix will be slightly leaner. Not sure by how much, or to what effect it will have (may be a 0.1 AFR difference; may be 0.5, or 0.9 etc, just not sure...) Do you have the newer racetuner (Pro) where you can use smartune feature? My dealer here charges $41 bucks to do a dyno pull; you may be able talk with the tech and see if they can alter the VE table while the bike is hooked up? worth a try...