New Pipes. Now problems. Help!!!!
Road Master
Joined: Apr 2009
Posts: 754
Likes: 24
From: Southern Maine
I agree with Blk and Chrome on that. I believe the decel popping is because of the open design of the mufflers, the factory chambered mufflers change the frequency of the exhaust pulses. I don't think the exhaust will change fuel ratio enough to overwhelm the ECM's ability to compensate for some variations. The intake system is the primary bottleneck in the system, stock backing plate and filter is like sucking air through a straw.
Road Master
Joined: Feb 2011
Posts: 784
Likes: 10
From: SE Pennsylvania
That's true and the bike is not running more lean. Popping doesn't mean a lean condition. The popping is occuring because the baffles are larger allowing more air to come in from the back end and burning leftover fuel in the pipes. Stock bikes come from the factory running lean, which means there's already too much air in relation to the fuel. Increase the fuel, and you solve the lean condition. Now, increase the air coming in, and you once again have to fatten up the mix by adding a bit more fuel....same concept as rejetting the carb and shouldn't be any more complicated than that just because the fuel is squirted in via electronics. Adding bigger pipes allows the air to flow out of the "lungs" more efficiently.
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Elite HDF Member
Joined: Dec 2010
Posts: 4,501
Likes: 26
From: Sheboygan,Wi
I understand about the incressed popping from the pipes. But what concerns me more is the hesitation/sputter around 2100-2300 rpm on light acelleration and steady throttle.
Road Warrior
Joined: Sep 2008
Posts: 1,620
Likes: 0
From: Irvine, Orange County, Ca
Sounds to me like you've got a good reason to GO SHOPPING! If money's the issue, you can probably mod your A/C by removing the back plate for a quick fix. But you're going to need to get a fuel controller. FuelPak is relatively cheap and very easy to use. However, If you're going to be doing more engine work in the future, you may want something more powerful. I run the FuelPak on all my bikes and haven't ever had an issue. Good luck!
Club Member
Joined: May 2007
Posts: 145,895
Likes: 821
From: 40 miles Northeast of Indy..
from what I've seen and read the stock A/c will flow more than the heads.
so a better flowing pipe system can bring more through the A/c and heads meaning Ur A/f will even be leaner that the stock headers and pipes..
The ECM will adjust up to 10% change, so even if it does the A/F ratio will still be no better than EPA lean.
Even with a stock bike some members change the A/F ratio to richen up the mix.
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Elite HDF Member
Joined: Dec 2010
Posts: 4,501
Likes: 26
From: Sheboygan,Wi
Just talked to Fuelmoto and will be taking the bike to them in a month or so when I get back home again. They will do the stage 1 A/C along with the power commander V and a dyno tune. They are only about an hour away from me. Should take care of any issues and make me a happy camper.
Seasoned HDF Member
Joined: Sep 2009
Posts: 25,307
Likes: 2,443
From: Eastern NE
Misbehaven; depends on your definition of "pipes" because it sounds like you swapped entire "exhaust" vs. "slip-on pipes" so you're running way too lean. I see you're military so my recommendation is to contact Dobeck Performance & look into their TFI or GEN3 tuner(s). They have an awesome military discount (my TFI was $150 last year). Their tuners are the base for many - just take a look at their site & you'll see. Call them - you'll be suprised at the quality & price - won't break the bank...
http://www.dobeckperformance.com/default.asp
http://www.dobeckperformance.com/default.asp
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