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[Hotrod50]

I have the stock Ventilator on my 09 FLTRSE3.  If I put on a Heavy Breather, will it flow the same?  I don't want to have to re-tune.

[firehog383]

No. The heavy breather flows more air than the ventilator, if you look at the factory specs on a SERG vs SESG the road glide has more torque and the only difference is the air cleaner. I'm not sure if it is enough to warrant a new tune, someone else with more knowledge than me should chime in.

[GregKhougaz]

You might want to try using the search function for this issue.  I know this was discussed back in 2009.  I think you'll find the difference to be negligible.   Thus, a tune would not be required. 

[tweeter13]

what tunner are you using.  If your using the tts.  you should be able to just do a few vtune sessions to take care of it.  I dont know about any of the others  Power comander has something like it also.     I am not sure how the thunder maxworks but I guess the way you read it it will adjust itself.  but I would not take that for sure.  I dont know anything about it but from what i read on there web sight.                                                                                                      todd.

[Unbalanced]

I havent had the issue, but have heard that the Heavy Breather is said to have an issue that HD hasn't been able to resolve which causes oil blow by and leakage on the cam side of the motor.   

[GregKhougaz]

I havent had the issue, but have heard that the Heavy Breather is said to have an issue that HD hasn't been able to resolve which causes oil blow by and leakage on the cam side of the motor.   

None with mine but I have heard it happens.   

[SDCVO]

I have never had a problem with mine...

[murphy]

It's been my experience that they come from the factory lean, tuning should be included in the ridiculous price we paid!

[CVODON]

Steve @ Fulsac addressed this back in 09 on this site. Per his dyno tests, best I remember the Ventilator only restricted HP about 2HP over no breather at all, So the possibility that the Heavy breather could restrict less is almost negible if any at all. So any v-tune adjustments would probably be the result of different weather/altitude that day rather than the breather change.

[firehog383]

Maybe it is'nt an issue with a stock 110 but it sure was on my built 114, dyno showed 10 HP and 7 tq difference compared to the S&S tuned induction. When your paying big money for HP that was cheap compared to other methods. Just my back to back test because I did'nt want to spend the 400.00 on an air cleaner unless it performed. I can't tell you from experience but my tuner claims the heavy breather is similar in gains to the S&S tuned induction. I'm not planning on any engine work so to me there is not a big enough isue to force me to drop my lowers. Like I stated earlier the Roadglide is the same except for the air cleaner and it is rated at 122 ft. lbs. at 3750 rpm the streetglide is rated at 118 ft. lbs. at 3750 rpm and that is stock open up the exhaust, cam change and it becom a big diference.

[Hotrod50]

Someone needs to post a step by step tutorial (at a very basic level) of how to do a vtune.

[glens]

1)  Prepare a calibration to use with v-tune by enlarging as much as possible the area of the fuel table to run in closed loop.

2)  Record v-tune data while riding as deliberately as possible.  As few sudden/quick throttle changes as you can.  Try to operate the engine smoothly in more areas than you normally would.

3)  Use the v-tune software to generate a new calibration from the one used while last collecting data.

4)  Repeat until you have covered as much of the operational range of the engine as you can and with minimal VE changes from the previous iteration.

5)  Restore the fuel tables and other things you'd altered from the base calibration for purposes of v-tuning, keeping the new VE values generated in the process.

6)  Log spark data with this new calibration and if spark knock is detected then address the spark timing tables accordingly.

7)  If you made changes to the spark tables, perform another v-tune session covering the areas you changed timing so as to get the VEs corrected to match the new timing in those areas.

8)  Blend the VE tables as necessary outside the areas you got them "fixed" by v-tuning.

9)  Enjoy the fruits of your time and labor.


If your VE tables wind up showing choppy graphs, play around with the EGR settings followed by v-tune runs in those areas.  The VE table graphs can have a non-flat shape but you want the contours to flow smoothly with as few and small peaks and dips as possible, but don't adjust them smoother by hand!