New Pipes... Minor Deceleration Pop - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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Old 05-16-2011, 01:11 PM   #1 (permalink)
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New Pipes... Minor Deceleration Pop

With the new pipes, I noticed I'm getting some deceleration popping. Not much, but enough.

I guess I have a couple questions on everything.

First, what is the negative impact this might have on the bike?

Second, I bought the bike from a dude who had all the bells and whistles added. Bike came with a Dyno Power Commander that was tuned in specifically for the bike. With that being said, do I need have it re-dynoed?

Third question... I know nothing about power commanders. Is it possible to have Harley remap the bike with the power commander on it to get rid of the decel pop or once you get a power commander, it pretty much takes over those responsibilities and you have to have it re-dynoed?

Thanks for any and all feedback. I know basic maintenance, but once you start getting technical with the engine and mods, I know nothing.
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Old 05-16-2011, 01:44 PM   #2 (permalink)
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With PC, (Power Commander) YOU can simply find another, richer map with equipment closer to yours, (downloaded right off the PC site) and install it with your own laptop. It's easier then you thing.

"Some" minor rumbling or popping is acceptable because the new pipes have less restriction and backpressure. However, keep an eye on your spark plug color and any changes to oil temps, or pinging that wasn't there before..............
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Old 05-16-2011, 03:37 PM   #3 (permalink)
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Hey, Dave, I know this is a subjective question with a ton of variables, but about how many miles would you have to ride before your plugs show a change in your running condition? IOW, how long would you have to run rich to turn em black.

I know, depends on HOW rich, but can you give me a rough idea?
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Old 05-16-2011, 03:50 PM   #4 (permalink)
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It's not a matter of how far you ride, it's HOW you ride.

Tooling around town is only going to get you in the low-mid ranges. You want to do highway riding, with clean, fresh plugs and ride about 5-10 miles. Change speeds during this ride, and include accelerating onto the highway and drive like you normally drive. If you include some 35-45 mile an hour back roads, then fine.

I've read methods where theoretically, you need to ride a few miles, then chop the throttle at speed, pull the clutch, turn the engine off, pull over and check the plugs THEN, not tooling back home and riding slow though town again, loading the plugs up.

Personally.....I've never been a fan of pulling steel plugs out of hot aluminum heads.



I check my plugs about once every 2-3 months. I like to pull them, look at the color and if it's OK, then you're generally fine, unless a drivability issue arises or you notice something "different", like exhaust tone, popping or lugging. then the plugs are the best way to see what's going on.

Never rely on plug readings if the bike sat and idled for a bit, or if the bike ran short, slow ride lately, around town, or especially after start-up with an enrichener. The readings will always show richer then normal due to the added fuel.
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Old 05-16-2011, 04:02 PM   #5 (permalink)
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Thanks, Dave.
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Old 05-17-2011, 06:21 PM   #6 (permalink)
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Quote:
Originally Posted by Dave63 View Post
With PC, (Power Commander) YOU can simply find another, richer map with equipment closer to yours, (downloaded right off the PC site) and install it with your own laptop. It's easier then you thing.

"Some" minor rumbling or popping is acceptable because the new pipes have less restriction and backpressure. However, keep an eye on your spark plug color and any changes to oil temps, or pinging that wasn't there before..............
I'll have to check it out and see what I can manage on my own. The indie here that has a dyno charges $250 to map it out. That's a pretty pricey procedure. Bet that little machine paid for itself after just a few of them.
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Old 07-20-2011, 08:18 PM   #7 (permalink)
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Dave, I took your advice and did my own tuning with a premade map off the website. It got rid of about 90 percent of the popping. The only time I hear it now is if I'm engine braking down steep hills. When I hear it now, I usually just bump it up a gear and all is right with the world.
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