Posted: 3/11/2013 2:41:41 PM EDT
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Looking into getting my first bike this year; CRF250L.
It's a new bike, so the aftermarket is slowly picking up. FMF now has a full exhaust system for it, but I see that they sell just the muffler as a stand-alone product. My question is, if I were to install just the FMF muffler, and not the header, would I still need a fuel programmer? I assume using one would maximize performance, and I would like to get one down the road. But will installing the muffler onto the stock header, and not using a programmer, have any negative results? It's the PowerCore 4, if that matters. |
| Anything street legal any more runs pretty damn lean from the factory stock, opening it up with a freeflow can could make the lean condition go past the point of "it's OK". I'd think about getting them both at the same time. From what I've read about that kit it makes a pretty good difference on the little CRF. |
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Anything street legal any more runs pretty damn lean from the factory stock, opening it up with a freeflow can could make the lean condition go past the point of "it's OK". I'd think about getting them both at the same time. From what I've read about that kit it makes a pretty good difference on the little CRF. I found a company selling a nice kit that includes the FMF PowerCore 4 (or Q4), header (choose Powerbomb or Megabomb), fuel programmer and 13T front sprocket. Reviews of the 250L with these upgrades have been really good. "A whole new bike", people are saying. Not sure I'll be able to swing the $650 for the kit, after buying the bike, though. We'll see. It's cheaper than buying separately, so maybe I'll just wait to get the whole kit. Or I could sell off the shotgun I've been wanting to get rid of that I never shoot, and be able to buy the kit right away. I emailed them when I found them after starting this thread. They said there's really no downside to the FMF pipe-and-nothing-else combo, but if I could only afford 1 thing right now, that I should go with the fuel programmer. |
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I ride a husaberg 450. I put a FMF slip-on on my bike and had the bike retuned. My dealer actually did the tune, husaberg has many tunes you can select for different pipes you add.
Everybike I have ever ridden with a pipe and no fuel adjustments has been really poppy and runs hot. |
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I ride a husaberg 450. I put a FMF slip-on on my bike and had the bike retuned. My dealer actually did the tune, husaberg has many tunes you can select for different pipes you add. Everybike I have ever ridden with a pipe and no fuel adjustments has been really poppy and runs hot. Noted, thanks. I've been really wanting to sell one of shotguns, and if I do, I'll be able to get the whole kit and the fender eliminator that I've been eyeballing. If you get the kit, the programmer comes pre-programmed for the header/pipe combo, so I guess that's another good reason to hold off for now. |
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Is it a closed loop system? If so it will compensate. Even if an open loop usually just replacing the muffler will not require a reprogram. Changing the intake and muffler will require the reprogram. I don't know what that means.  
This will be my first bike. |
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Is it a closed loop system? If so it will compensate. Even if an open loop usually just replacing the muffler will not require a reprogram. Changing the intake and muffler will require the reprogram. I don't know what that means.
This will be my first bike. Closed Loop Closed loop means there is feedback of the result to the ECU. In our case, it means there is sensing or measuring of the exhaust gas to see how the bike is running. This sensing is done by a probe (a galvanic cell) which generates a voltage based on the gas around it. These probes are referred to as Oxygen sensors, Lambda sensors, O2 sensors, Exhaust Gas sensors and probably a few other names as well. I’ll call it a Lambda sensor. Why Lambda you ask? Open Loop Open loop simply means there is no feedback of the result to the ECU. In our case, it means there is no sensing or measuring of the exhaust gas to see how the bike is running. The fuel injected is determined by the RPM and throttle position, derived from fuel injector pulse width numbers stored in the fuel maps, and is trimmed for environmental conditions due to air temperature, air pressure and engine temperature. http://www.bikeboy.org/open_closed_loop_efi.html |