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Old September 11th, 2015, 08:40 AM   #1
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Booster plug

Anybody else install a booster plug I did I really like it I don't know if they gave me any more horsepower but it does run better.
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Old September 11th, 2015, 09:36 AM   #2
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I looked into it. I don't really see how it can work properly. The device is said to offset your temperature reading to trick the bike into thinking it's colder out. Then, the bike will add more fuel to compensate for denser air. They are taking advantage of one of the base maps in the computer which adjust a fixed amount for temperature and elevation.

But the whole problem with this bike is that the closed-loop feedback from the O2 sensors makes it too lean and thus makes the bike "surgy" and causes hesitation. So, you start adding more fuel, it's going to see that it's running rich, and try to lean out the system in closed-loop, within a certain tolerance.

Their website makes little sense, for example:
Quote:
Why don't you show the Power improvements of the BoosterPlug in a Dyno graph ?


As all other resistor tuning devices, the BoosterPlug is not about top end horsepower. (The closed loop operation prevents this - and if you seek more flat out power you must bypass the Oxygen sensor in some way)
In reality, the bike is in OPEN loop during high RPM and throttle openings. The O2 sensor has nothing to do with this. I don't know about you, but the bike is plenty fast for me. We are all simply seeking better rideability and smoothness around town.

So, there are 2 things that could happen here. You will notice a difference initially for maybe 100-200 miles until the ECU adapts to the added fuel and goes back to being lean. Or, the boosterplug has exceeded the adjustment limits of the closed loop adaptation, and you will get more fuel at low RPMs, and way too much fuel at high RPMs. The bike is already on the rich side at high RPMs, as a safety precaution to keep temperatures in check. If you look at power commander and rapid bike base maps, you will notice they actually remove fuel from the high RPM/throttle conditions for more power.

That's my take on it... I did a fair amount of research. Please post with your feedback in about 200 miles I'm very curious to see if you notice a difference.

edit: I recently purchased a RapidBike EVO unit and hope it is the right solution. The way it works is sending the ECU a fixed voltage from the O2 sensor wires. This makes the ECU think it's running at the perfect 14.7 ratio so it stops adjusting fuel ratio. The module then uses its own algorithm with inputs from the O2 sensor to tune the bike for a richer ratio. There's also the option to stop auto adjusting, which effectively eliminates the use of the O2 sensors and makes the bike open-loop.

Last edited by kuksul08; September 11th, 2015 at 09:43 AM.
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Old September 11th, 2015, 11:47 AM   #3
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Joined: Sep 2015
From: California
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I've probably put about 2000 miles on the bike since I installed it from sea level to 9000 feet bike does seem to run better in all situation I too was not looking for more horsepower just a better running motorcycle and for 120 dollars I took a chance on it and I'm happy with it although I do run and arrow slip on with it I appreciate all feedback on this issue.
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Old September 11th, 2015, 12:19 PM   #4
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Quote:
Originally Posted by Marty Moose View Post
I've probably put about 2000 miles on the bike since I installed it from sea level to 9000 feet bike does seem to run better in all situation I too was not looking for more horsepower just a better running motorcycle and for 120 dollars I took a chance on it and I'm happy with it although I do run and arrow slip on with it I appreciate all feedback on this issue.
Where in CA are you?
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Old September 11th, 2015, 02:43 PM   #5
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Keyes ca
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Old September 13th, 2015, 12:04 AM   #6
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Joined: Jun 2014
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I Ride: hyperstrada 821
I looked at the booster plug a while ago and have forgotten the specifics, but the gist is that it works during transitional periods: IE acceleration/deceleration - it's main thing is to smooth out surging. At steady state it's out of the loop.

Could you describe in more detail, how it runs better?

Last edited by appliance821; September 13th, 2015 at 12:08 AM.
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Old September 14th, 2015, 07:59 AM   #7
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Joined: Sep 2015
From: California
Posts: 16

The bike seems to come off idol and return the idol much smoother than before no hesitations anywhere. before when I would pull up to a stop light the bike would almost die and it had a hesitation around a quarter throttle or so. Apparently the booster plug is pretty popular with the BMW guys they have the same issues as we do there's a lot of information on booster plugs website testimonials and such.
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Old September 14th, 2015, 12:57 PM   #8
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I Ride: hyperstrada 821
Quote:
Originally Posted by Marty Moose View Post
The bike seems to come off idol and return the idol much smoother than before no hesitations anywhere. before when I would pull up to a stop light the bike would almost die and it had a hesitation around a quarter throttle or so. Apparently the booster plug is pretty popular with the BMW guys they have the same issues as we do there's a lot of information on booster plugs website testimonials and such.
That sounds right - It richens the mixture in those transition periods before the O2 sensors overrule it. I don't really have an issue, but it seems like an inexpensive, unobtrusive fix for borderline cases.
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Old May 8th, 2019, 05:33 AM   #9
gus
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Joined: Dec 2018
From: England
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Hi just fitted a second hand one from a Darvel as it was cheap on Ebay onto my 939 had to mod the connectors to fit but definitely a positive result for roll on roll off throttle control , Gone from a 5 out of 10 to a seven on smooth power delivery but would really love to have a full remap as it looks like it's mainly emissions control causing it to be a jerky SOB.
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Old May 9th, 2019, 06:37 AM   #10
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Joined: Jan 2015
From: Austria
Posts: 330

I Ride: 2016 Hyperstrada 939 red, 2006 MotoMorini Corsaro 1200 black/silver, 2005 Aprilia RSV1000R Factory
Quote:
Originally Posted by gus View Post
Hi just fitted a second hand one from a Darvel as it was cheap on Ebay onto my 939 had to mod the connectors to fit but definitely a positive result for roll on roll off throttle control , Gone from a 5 out of 10 to a seven on smooth power delivery but would really love to have a full remap as it looks like it's mainly emissions control causing it to be a jerky SOB.
And it uses about 10-15% more fuel with boosterplug.
Still have it at home, but disconnected, and use a Rexxer mapping instead.
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