Engine Stumble with new pipes
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Stage I
Joined: Apr 2013
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From: CZ
Engine Stumble with new pipes
Greetings. I have this question about my bike. It's a 2011 Nightster, I bought it last year in January and with stock exhaust had no problem to start. Even during the winter it fired up on the first attempt and ran smoothly with no problem at all. In spirng, the first thing I changed was pipes, because stock exhausts are .. let's say a little bit boring . I got V&H TWIN SLASH 3" SLIP-ONS and the situation changed a bit. During the summer start-ups were fine. But then in idle (even with warm engine) the engine was kind of choking a bit, it wasn't as smooth as before and often the flow was like ta-ta-ta-1/2 sec pause-ta-ta. I understand, that if I change only exhausts and nothing else (like air intake), I don't have to change the fuel map, the injection can just "calculate" it itself. And the guy in garage, who changed my pipes, told me, that this kind of open-ended pipes causes this thing, that the air exiting the engine from exhaust is going out faster then the air going in the engine through air intake. Is that true and may this be the cause?
Bec. thing is, after few rides with new pipes I was a bit scared of the enormous loudness of them and I orderd quiet baffles. I had grown some ***** until they arrived, so I haven't installed them yet, but compared to standard baffle, which is just a hollow tube with profiled wall, quiet baffle has a piece of metal covering the whole diameter inside. So as I see it, it would definitely slow the flow of air comming out and thus enhance the smoothness of the engine run?
Bec. thing is, after few rides with new pipes I was a bit scared of the enormous loudness of them and I orderd quiet baffles. I had grown some ***** until they arrived, so I haven't installed them yet, but compared to standard baffle, which is just a hollow tube with profiled wall, quiet baffle has a piece of metal covering the whole diameter inside. So as I see it, it would definitely slow the flow of air comming out and thus enhance the smoothness of the engine run?
Road Warrior
Joined: Mar 2012
Posts: 1,391
Likes: 4
From: Upstate NY
The mechanic was correct, it's caused by just having the exhaust upgraded. The Vance & hines quiet baffles will give you a little more back pressure. Not sure if they will stop the choking out that is happening though. I just installed them in my short shots and they give it a nice deep tone, and quiet down the bike at idle. But still have the same loudness at open throttle.
Stellar HDF Member
Joined: Feb 2011
Posts: 3,335
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From: San Diego, CA
Yes, it is true that you don't need a remap. Even if you get a high flow air cleaner you really don't need a remap. All the remap will do is raise your rev limit a little but your bike will still be running too lean. And yes the part about the exhaust letting out more air faster than the intake can suck in is also true. I, personally got the Vance and Hines Q-series pipes and a Vance and Hines Naked VO2 high flow air cleaner. Then got a set (pair) of X14iEDs to make my fuel ratio a little richer and haven't looked back ever since.
Whether you get a high flow a/c or not, the bike will run much better with some XiED's and some W118 TTI (no matter which baffle you use).
XiED LINK (the 2012's do better with the XiED than the X14iED)
TTI LINK
XiED LINK (the 2012's do better with the XiED than the X14iED)
TTI LINK
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DKCustomProducts.com
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Joined: Jun 2007
Posts: 45,429
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From: Bedford UK
Hi Postal, I take it you are in the Czech Republic? Welcome to HDF from the UK.
There is a useful post in the Technical section that is well worth reading, about altering modern vehicles, including Harleys.
When new your bike was new, it was set up to meet strict emissions regulations. By changing the exhaust and air filter that has been upset. Your bike may well run like a pig until it is sorted out, which needs an add-on tuner.
There is a useful post in the Technical section that is well worth reading, about altering modern vehicles, including Harleys.
When new your bike was new, it was set up to meet strict emissions regulations. By changing the exhaust and air filter that has been upset. Your bike may well run like a pig until it is sorted out, which needs an add-on tuner.
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