replace stock a/c to gain power? worth it?

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Feb 25, 2010 | 11:56 AM

wkottas

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Cruiser

Joined: Jun 2008

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From: Kansas City

replace stock a/c to gain power? worth it?

I've been searching and reading many, many posts here regarding replacing the stock HD a/c with either K&N, SE, Arlien Ness (to name the top ones). The one thing missing, at least in my searches, is that there doesn't seem to be any defiinitive agreement as to how much HP is gained, if any? In some magazines, I have read some guarentee xx% increase, but how the heck am I going to prove/disprove that?!

thoughts???

Ride long and safe everyone!

Feb 25, 2010 | 11:58 AM

DR. V-TWIN

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From: Los Angeles, CA

Put it on a Dyno, get a run before the swap, and one after.

Feb 25, 2010 | 12:25 PM

Ronp42

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From: Here

Quote:

Originally Posted by wkottas

If you are changing the AF only, I don't think you will see much difference. My last four Harley's was stock when I bought them. I did the stage1 Dealer DL with SE AF and exhaust. I could tell a big difference in throttle response. as for HP increase, I've heard any where from 7 to 15 HP. I don't know for sure. Never cared, I just wanted it to run good and sound like a Harley.

Feb 25, 2010 | 01:24 PM

nvsteve

Seasoned HDF Member

Joined: Oct 2006

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From: Nevada

With K&N airfilter kit, V&H Oval slipons and a PC111 I went from 66hp/80tq to
75hp/88tq. From everything I've seen this is about average.
07 Ultra.

Feb 25, 2010 | 01:35 PM

g money

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From: On Parole - Grays Creek, North Carolina

Most increases are at 5000, 5500 rpm. If you live up there, go for it. Most of my riding is at 3000. The gain at 3000 or 3500 is only about 2 to 3 horsepower. I'd rather buy $1000 worth of beer, than pipes and an air cleaner and a fuel management system and gain only 3 horsepower.
Gary D.

Feb 25, 2010 | 01:36 PM

Steve On 3

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From: Charlotte Area

More than anything the new A/C lets more air in. think of your engine as a big air pump. If you maintain the correct air to fuel ratio (AFR) as you put more air in, you can put more fuel in and result in more power or torque, usually both. As others have posted, a high flowing A/C with free flowing exhaust and the proper tune will usually add 7-11% power and torque. The key thing would be to find a good tuner WITH A DYNO and let him work his magic on it.

Bub