Sensible power gains from 2004/5 engines?? - Honda Motorcycles - FireBlades.org
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post #1 of 7 Old 07-25-2011, 9:54 AM Thread Starter
 
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Sensible power gains from 2004/5 engines??

Got hold of a stock engine from a 2004/5 fireblade, which has 5,500 miles on. Looking to get some more power from it and need tips on the best ways to get reliable increases. Dont want to end up with something fragile and in need of re-building every 1000 miles. Aside from usual change to different exhaust system, power commander etc Its being used in a project replica bike, Im doing all the lightweight bits I can, so this is last big piece of the puzzle.
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post #2 of 7 Old 07-25-2011, 12:05 PM Thread Starter
 
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Re: Sensible power gains from 2004/5 engines??

What would be an attainable realistic BHP gain?
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post #3 of 7 Old 07-25-2011, 4:05 PM
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Re: Sensible power gains from 2004/5 engines??

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Originally Posted by scott22neale View Post
What would be an attainable realistic BHP gain?

Depends entirely on what modifications you make.
If you turbocharge it then probably double the output is not out of the question.
Bhp is measured at the crank, hp is measured at the tyre.
Most "normal" engine modifications for road use would be in the 10-15% increase I'd guess - basically a full exhaust system and dyno tuning.
Boring it with high-compression pistons, port the head, cams, bigger throttle bodies and good tuning you might see 20-25% over stock.

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post #4 of 7 Old 07-25-2011, 6:07 PM
 
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Re: Sensible power gains from 2004/5 engines??


That is my friend Christer with his Haya at some dyno shootout in the US at the time.
Please define sensible.....

(Yeah...he won the shootout...)
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post #5 of 7 Old 07-26-2011, 12:35 AM
 
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Re: Sensible power gains from 2004/5 engines??

My question.. By lightweight bits, what exactly do you mean?

If you are talking about things like lightened stator, lightened crank.. etc.. then all right, not to bad haha.. Definitely some place to start

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post #6 of 7 Old 07-26-2011, 4:29 AM Thread Starter
 
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Re: Sensible power gains from 2004/5 engines??

Cheers for the replies so far all

Just to clarify some bits, the lightweight parts I have already are, forged magnesium wheels, carbon fibre tank cover, self-supporting carbon kevlar seat unit, full titanium exhaust system, and little bits like lightweight sprockets, levers, etc etc.

I was thinking of lightening up some of the internals like lightened flywheel etc if they dont make it too fragile.

Basically what Im hoping to attain is a genuine rear wheel HP figure of 180-200 HP, so between 200 - 220 BHP at the crank.

Really appreciate the suggestion about the turbo but probably have to rule it out as the bike is going to be a HRC RC211 replica from the 2004-2006 era, and trying to get the look as close as possible.
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post #7 of 7 Old 07-26-2011, 11:16 AM
 
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Re: Sensible power gains from 2004/5 engines??

180-200hp without opening up your engine and doing alot of work is not going to happen
my track bike has a sbk engine and i am up around 180... but its expensive... and the more you beat on it the more you have to open it up and change rings/adjust stuff

forks... shock..rims... subframe... brakes.. RIMS.. RIMS RIMS... clip ons... rearsets... battery.... harness
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