Nitrogeno25
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| posted on 19/2/07 at 03:13 PM |
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Power commander
After building a CEC I'm in the early stages of building a BEC. I'm thinking of a cbr1000 engine.
Do I need a power commander? What's the benefit?
Thank you.
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G.Man
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| posted on 19/2/07 at 03:21 PM |
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Power commander allows you to adjust fueling on a fuel injected bike engine...
So that should answer your question
Opinions are like backsides..
Everyone has one, nobody wants to hear it and only other peoples stink!
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Nitrogeno25
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| posted on 19/2/07 at 03:26 PM |
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First thanks for your reply.
I understand that, but do I need one if running the engine stock, with fabricated exhaust?
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ecosse
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| posted on 19/2/07 at 03:47 PM |
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Unless you are intending to change to an injection system for the CBR engine a power commander would be no use as they (AFAIK) all used carbs for the
induction.
Cheers
Alex
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G.Man
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| posted on 19/2/07 at 03:53 PM |
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Unless you are running the engine in a stock bike with original airbox and exhaust, you will almost certainly have to adjust the fueling...
The bike even runs better stock with a power commander due to built in lean spots for bike emissions tests...
Last time I checked a CBR1000 Fireblade was fuel injected Ecosse...
Unless he means an earlier model
Opinions are like backsides..
Everyone has one, nobody wants to hear it and only other peoples stink!
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ecosse
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| posted on 19/2/07 at 04:12 PM |
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quote:
Last time I checked a CBR1000 Fireblade was fuel injected Ecosse...
Unless he means an earlier model
You are right but I just presumed as it was missing the all important "r" letters that it was the earlier bike, but if we are taking about
Fireblades then they are probably all injected.
Cheers
Alex
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Nitrogeno25
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| posted on 20/2/07 at 12:58 PM |
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Well, I was thinking of a CBR1000RR, stock airbox but modified exhaust.
What would happend if, at first, I try running it with the stock ECU alone?
Thank you.
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Nitrogeno25
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| posted on 20/2/07 at 01:04 PM |
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What about Megasquirt? Anybody had experience with these setup?
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smart51
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| posted on 20/2/07 at 01:15 PM |
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Stock bike exhausts restrict gas flow in order to reduce noise. A straight through silencer uses padding to reduce noise. The silence less but
restrict flow less. The restriction is proportional to the square of engine speed.
Thinking out loud, I suspect that half of the problem is that it takes more power to push the exhaust gasses out of the stock can so robbing the crank
of a few BHP but half of the problem might be less scavenging due to the back pressure. If you fit a straight through can, you might get more
scavenging, drawing more air into the engine. Draw more air in at high revs and you'll run lean at high revs.
A colleague of mine has a GSXR1000 and he can adjust the fueling up or down a notch using the clocks. I guess this is just meant to be adjustment for
altitude or something. If the effect is slight on your car then this might be enough but if you do this you might run a bit rich at the low end.
You could use the stock can as well as the airbox. In which case you needn't adjust the fuelling at all, except perhaps for emissions at SVA.
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G.Man
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| posted on 20/2/07 at 01:59 PM |
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Fueling is also dependant on load..
The car will add more load to the engine and will change the fueling...
In essence, with a bike engine, the power commander is the easiest and safest route
If you run it with the stock ecu, it will probably run badly lean.
Opinions are like backsides..
Everyone has one, nobody wants to hear it and only other peoples stink!
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