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Andrew S asked:So what is the purpose of block off plates? I know its not really a power mod, is it just something that helps with getting a more accurate number at the dyno and eliminate the popping and flames from your exhaust?May 24, 2014
mark a:Short answer: if you've added any performance goodies intake, exhaust, etc, to your bike get these, or a similar set up, so that your fuel Injection can be properly tuned so you can get the most out of your performance goodies.
Long answer: to tune your fuel injection mapping the tuner (stock O2 sensor, after market O2 sensor like the power comander auto-tune, or having a competent person dyno tune your bike) is going to look at the oxygen content of your exhaust gases to determine what your air/fuel ratio is and add or remove fuel depending on whether you are to lean or rich. Built in to your cylinder head are 2 reed valves the inject air into your exhaust to burn off any fuel that didn't burn during combustion. This is done for emissions reasons as unburnt fuel is one of the things looked at during emissions testing. The problem is that the air added by the reed valves to burn off the remaining fuel is going to throw off the oxygen content of your exhaust and falsely make it look like your bike is running way to lean of an air/fuel ratio. These plates block off the air supply to the reed valves so they can't mess up your exhaust oxygen content and you can properly tune your fuel injection.May 25, 2014
Sam S:Yes, that is exactly what they do. These replace the secondary air system which takes fresh air from the airbox and puts it into the exhaust. The point of this system is from emissions, and ignites unburned fuel in your exhaust. As this system works, injecting fresh air into your exhaust will skew up any AFR readings that are done since they aren't measuring just the combustion readings, but combustion + fresh air.
This product comes with a rubber cap to block off the airbox as well, but you'll also need to make something to bridge the connector that goes to the secondary air system. If you have the skills to make a connector, more power to you. I just cut up and bend a paperclip and taped it over.May 24, 2014
Zach R:Pretty much. The factory emissions system takes excess air from the air box and sends it to the exhaust so that any unburnt fuel will combust inside the exhaust. Besides popping, this will screw up a tune because the sniffer will read a much higher value of air in the exhaust then there actually is, causing the tune to be extremely rich. This still applies for autotunes as well. This doesn't completely eliminate backfiring because my bike still does it under engine breaking, but it reduces the amount of backfires significantly. Sometimes atmospheric air will still cause the unburnt fuel to ignite in the pipe. Hope this helped. Not exactly easy to put in but a necessary mod and it goes fine with a little patience. May 24, 2014
Gregory M:Block off plates are necessary for eliminating the Air Induction System. AIS systems are designed to mix air with the exhaust gases to help prevent unburnt gas from being emitted thus reducing emissions. It's solely for EPA compliance. Block off plates allow the removal of obnoxious plumbing that sits on top of the motor, which will make doing plugs and coolant changes a lot easier. Assuming you do not have any exhaust leaks, it should eliminate popping under deceleration. May 24, 2014
James E:Yes. It will eliminate the popping and flames from your exhaust and give you an accurate exhaust reading on the dyno. Don't forget that you will also have to wire in a resistor once you remove your PAIR valves to keep from getting an FI light. check out the forums to figure out what resistor you need for your make and model. There are guys out there who make a nice little plug with the resistor wired In. May 25, 2014
You need it to get any type of accurate reading at all. There are ways to "pinch off" the secondary air system if you have a sniffer on the dyno. Its not 100% science but seems to do the trick. I would just spend the few extra bucks and install these bad boys to make the bike correct full time. Don't half ass things, that's a bad habit to get down the road.
May 26, 2014