tilly819
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| posted on 6/3/10 at 04:01 PM |
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bike engine stumbling at high RPM
hi all
have a wee problem,
when i open the throttle smootly and accelerce gently in 1st gear its all ok as far as i can tell
then when i change up to second and give it some its ok till about 6000 rpm then the engine starts to stumble/ splutter... this is the same throughout
the gears.
engine is a 2002 honda super blackbird on EFI
now the only thing i can think it might be that is obvious to me is that i have removed the air box and just have ITG socks over the trumpets is this
lightly to be part of the problem i though iniialy it might be turbulance from the bonnet scoop but i have blocked that off and the problem is still
there..
any ideas??????
tilly
F20C Haynes roadster 440 BHP/Tonne www.youtube.com/handmadeextreme
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twybrow
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| posted on 6/3/10 at 04:04 PM |
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Running lean I would suspect. Removing the airbox will have changed the flow of air going in, so you sound like you need a Power Commander and some
dyno time or a wideband lambda.
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tilly819
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| posted on 6/3/10 at 04:10 PM |
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I was looking at power comanders a little while back
am i right in thinking that you install it alongside your excisting ECU then would compensate by adding more fuel when it gets the signal from the
lambda to say it running lean or do you have to set it up yourself with a computer.....and a read out from the lambda?
F20C Haynes roadster 440 BHP/Tonne www.youtube.com/handmadeextreme
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tilly819
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| posted on 6/3/10 at 04:33 PM |
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ok just been doing abit of reading on power comanders aparently with the blackbird you need an o2 eliminator.......what is this for??
i have established i would need the power comander and a wide bacnd lambda with a read out so i can see when it is going lean so i would be able to
adjust the map to add more fuel at this point...is that corect??
thanks
sorry for the stupid questions im not very experienced with tuning EFI
thanks tilly
F20C Haynes roadster 440 BHP/Tonne www.youtube.com/handmadeextreme
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twybrow
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| posted on 6/3/10 at 05:14 PM |
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Not sure on the specifics of the Blackbird I'm afraid. Hopefully one of the experts will be along soon!
You could probably do without the lambda sensor/gauge if you take it to a rolling road for setup.
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StevieB
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| posted on 6/3/10 at 05:39 PM |
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I have a similar problem with my carb'd R1. I'm using a sausage filter and also have a TTS needle and jet kit.
It has a massive hesitation at 6,500 rpm.
I as thinking of just richening the fuel mix, but I think the best way would be a rolling road session to get it spot on.
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adithorp
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| posted on 6/3/10 at 11:09 PM |
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How bad is it? Is it just a flat spot or does it really loose power?
If it's the first then it could be the mixture/map and a powercommander would be the answer (probably a good idea anyway). If it's the
second then it sounds more like poor fuel delivery. What pump, etc, are you using?
adrian
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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