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[SixGun]

Well that's over the top, plus I have a 2007 Corvette that I have to dump money (OCD) into all the time!  I'll go with the HB, pro tuner, and V&H pipes and call it good.

[SPIDERMAN]

Seems like as good a place as any to post this. Cappy my neighbor you hear me write about on occasion has had some issues with his 06 FLHX. It runs good at over 1,000 RPM, but idles pretty ragged. He recently had an H-D dealer check the air/fuel on it and the tech told him he had way too much breather/air filter for the motor. The tech told him he needed to pull down the amount of air being pumped into the heads by restricting the airflow to a much smaller filter/breather set-up. Basically, he was told no more than a K&N filter on in the stock hamcan because he had a stock 88" motor with only SE slip-ons.

Ok, now away we go with comments, because this sure is a new one on me and I've gotta believe many of you as well

B B

[DESERTBEAR54]

Spiderman that makes somewhat sense to me unless you re-do your top-end and lower end to compensate for the heavy air intake. I just wonder if a SE HB on a stock 110 is too much for it or should I just put a K&N in place of the SE cleanable paper filter that is worthless.

[Talon]

I would think that the TB, or intake would be the bottle neck, in stock form I wouldn't think they would flow over what the motor would handle. But I don't know for sure. Now if you throw a big TB on a stock motor you will suffer at low end, not enough velosity coming into the chamber. Like sucking thru a normal straw, you can feel the air coming in if you hold you finger close to the other end, but if you try to suck in air from a 2" piece of PVC your lungs will fill up, but you wouldn't feel the velocity at the other end, to much volume, won't keep the fuel suspended, you"ll get gas pooling in the TB.

[SPIDERMAN]

I would think that the TB, or intake would be the bottle neck, in stock form I wouldn't think they would flow over what the motor would handle. But I don't know for sure. Now if you throw a big TB on a stock motor you will suffer at low end, not enough velosity coming into the chamber. Like sucking thru a normal straw, you can feel the air coming in if you hold you finger close to the other end, but if you try to suck in air from a 2" piece of PVC your lungs will fill up, but you wouldn't feel the velocity at the other end, to much volume, won't keep the fuel suspended, you"ll get gas pooling in the TB.

The diagnosis was made by sticking a sniffer up the muffler much the same as when you get your cage smogged. Don't know how valid a test for air/fuel that is.

B B

[DESERTBEAR54]

I read and see that K&N has a HD-1508 filter that fits right up to an 08 SEUC. No conversions or anything just a better filter than the stock SE washable paper filter that comes with the bike stock. Boy that was mouthful!!

[SixGun]

Spiderman, they do say it is compatible with the stock TB.

I would think it would have an asterisk at the bottom say you need to do some motor work to use it.

[Talon]

The diagnosis was made by sticking a sniffer up the muffler much the same as when you get your cage smogged. Don't know how valid a test for air/fuel that is.

B B

BB could be right, I don't know. I'm running a Doherty Power PACC, flows pretty good, it's on a stock 88" with V&H classic slip-ons, it runs pretty good, not problems at idle, I get a little decel pop once in a while. I'll get it dyno'd when I get the Cycle-Rama 95" on it this fall.

[grc]

Spiderman, they do say it is compatible with the stock TB.

I would think it would have an asterisk at the bottom say you need to do some motor work to use it.

I believe it also says "ECM calibration required".  Normal operation in closed loop mode should be OK, since the O² sensors will signal the ECM to adjust the mixture.  High speeds and wide open throttle will result in a leaner than stock mixture when the bike goes to open loop mode and the fuel is controlled strictly by the map.  I have no way of knowing how much the AFR would be affected, and therefore no way to determine if this change would be safe without remapping.  Best advice is to have it remapped.

With a carburetor or a throttle body injection system, intake manifold air velocity is important to prevent fuel drop-out and puddling.  With sequential port fuel injection (Delphi), the fuel is injected right at the intake port and all mixing with the air is accomplished in the port and the cylinder.  Running oversized intake components (TB/manifold and filter) should have much less effect (if any) on an ESPFI engine than it did on the carb bikes, or the earlier fuel injection systems that injected fuel near the throttle plate.

Jerry

[ggraham45]

Ihave the hb on my 08 serk with rh true duals and the power com.Bike runs well pulls very hard lost a little on the bottom but pulls very hard from 2300 to 6000rpms

[grc]

Seems like as good a place as any to post this. Cappy my neighbor you hear me write about on occasion has had some issues with his 06 FLHX. It runs good at over 1,000 RPM, but idles pretty ragged. He recently had an H-D dealer check the air/fuel on it and the tech told him he had way too much breather/air filter for the motor. The tech told him he needed to pull down the amount of air being pumped into the heads by restricting the airflow to a much smaller filter/breather set-up. Basically, he was told no more than a K&N filter on in the stock hamcan because he had a stock 88" motor with only SE slip-ons.

Ok, now away we go with comments, because this sure is a new one on me and I've gotta believe many of you as well

B B

Brian, all he needs is to have the mixture tuned with the parts he has.  Does he have a tuning device on it now, or just a factory calibration?  Harley stock maps and stage maps idle very lean, often around 15:1 or even leaner.  The problem with '06 and earlier models without O² sensors is that the fuel management system has no way to compensate for differences in actual air flow.  The fuel is injected based on the other parameters like throttle position-rpm-temp etc.  If you reduce the restriction to air flow, the system doesn't know that.  Too bad H-D doesn't use a mass airflow sensor like we do in the automotive world.

Jerry

[RedDevil]

Probably would take a VIN from a Springer to get it.

 
Ride Safe,
Fired00d
 

You're probably right Gary.     It's worth asking about though.

     

[RedDevil]

My '08 Street Glide has the V&H Pro Pipes on it along with the Heavy Breather.  The ECM was recalibrated using the Super SERT.  It idles great and pulls very well.  This is my first 96 " motor, so I can only compare what it does against how my 88" in my 02 ran, and the 110 in my SEUC.  It's definitely not like the 110, but it does a right nice job. 

   

[Black Diamond]

When I looked at putting a heavy breather on my build, Shovelhead Bob offered this to me:

The heavy breather is a great unit.... I wish more people would use it, as it really flows a ton of air... the only downfall is that it leans out the entire AFR chain by about 1 whole point, so the VE's need bumped up 15-25 units to equalize for all the extra air.

FWIW

JW

[SPIDERMAN]

Brian, all he needs is to have the mixture tuned with the parts he has.  Does he have a tuning device on it now, or just a factory calibration?  Harley stock maps and stage maps idle very lean, often around 15:1 or even leaner.  The problem with '06 and earlier models without O² sensors is that the fuel management system has no way to compensate for differences in actual air flow.  The fuel is injected based on the other parameters like throttle position-rpm-temp etc.  If you reduce the restriction to air flow, the system doesn't know that.  Too bad H-D doesn't use a mass airflow sensor like we do in the automotive world.

Jerry

Jerry,
       Cappy originally put the standard SE Breather kit and a set of the older slash cut SE Performance Muffs (you know the cheap ones you couldn't change tips on but they worked good ? )  At the time they did a remap (standard download)  of his ECM. So, it strikes me as odd that they wouldn't advise him to do another download this time unless there is no standard download that will work with the highflow breather.

B B