Rev limit to 13200rpm on a 954 . - Honda Motorcycles - FireBlades.org
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post #1 of 58 Old 03-02-2004, 5:38 PM Thread Starter
 
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Rev limit to 13200rpm on a 954 .

Hi ! Here in Germany is a rumor , that if You apply on the conector B 17 ( LIGHT GREY ) 12Volt maybe from the source B20 , Your revlimit will be 13200rpm and the fuel enrichment will be 4 % higher . This should be for the Superstock Series here in Europe . Does anybody know exactly more about this ? Sorry for my bad english ! Regards Harald !
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post #2 of 58 Old 03-02-2004, 6:18 PM
 
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Re: Rev limit to 13200rpm on a 954 .

Ask Stegen about it, he sure knows how to rev it to 11k.
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post #3 of 58 Old 03-02-2004, 6:36 PM
 
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Re: Rev limit to 13200rpm on a 954 .

I've been following developments on the 954 pretty closely over the last couple of years, howie, and this is the very first time I've heard of this. It certainly hasn't been mentioned anywhere here at FireBlades.org, that I can remember.

Would you be willing to try this on your own bike, without at least several trustworthy mechanics first assuring you that it is safe to do? Why would you take the word of anyone on an Internet forum, for that matter? You'd be asking your 954 to rev some 800 rpm beyond it's current maximum limit, and presumably outside its design specs. Not good!

Without additional head and valve work, and probably a different cam profile, you might not realize any benefit from extending the rev limiter in any case, because the power begins to tail off sharply at about 12000 rpm anyway.
Leave it to the racers to experiment for when it really matters. On the street, why would you need to do this?

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post #4 of 58 Old 03-03-2004, 3:23 AM
 
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Re: Rev limit to 13200rpm on a 954 .

Please try then let us Know Actually it sounds plauseable, but if it was the case someone on the forum probalbly would have heard about it by now? weather you want to take the risk and try it on your own bike is something you will have to decide for yourself If it was to work the occasional blast to 13k shouldnt really harm your engine as the STD limit would have been set conservatively, (its not like the factory set it at 12,200 or 12,400 or whatever and it then self destructs at 12,500) Motopower in the UK built a 178 rwhp blade that revs to 15,000rpm without a problem it uses std crank, rods and pistons although they run a slightly looser clearance on the centre main bearings to free it up a little, now before anyone flames me on this, Im not saying that without mods it would be safe to run a std 954 this high, but I believe 13k would be well within its limits! If you had a full system, bigger cams, bumped up compression (and throw in some shorter velocity stacks for good measure as these would complement this High rpm configuration) and a properly mapped PC3R you could well make use of some extra RPM and gain a size chunk of HP (maybe 160ish rwhp )
Now before anyone asks do you really need all this extra power on the street, first go and ask everyone who is going to by any of the new 04 models this same question!

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Last edited by Jungleboy; 03-03-2004 at 3:29 AM.
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post #5 of 58 Old 03-03-2004, 9:39 PM
 
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Re: Rev limit to 13200rpm on a 954 .

Wait just a minute guys. The 954 isnt going to benefit 1 shred from revving it to the moon because they have reached peak power before 12k. You probably wouldnt hurt it to take it to 13k in short blast but it would slow the bike down something fierce. You would have to add alot of breathing to the bike to get it to where it makes power up that high. Bigger valves, ported heads, and alot more duration on the cams.
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post #6 of 58 Old 03-03-2004, 10:02 PM
 
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Re: Rev limit to 13200rpm on a 954 .

My 03 model stock would peak out below the rev limiter.
SHE NOW HAS:vstacks, serpent exhaust, K&N, pc3r. and the biggest change was the pull to rev limit.
I would love to see 600 rpm more.

Just my 2 cents

QUOTE "Now before anyone asks do you really need all this extra power on the street, first go and ask everyone who is going to buy any of the new 04 models this same question!"

Right on!!

Last edited by Paul Armstrong; 03-03-2004 at 10:06 PM.
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post #7 of 58 Old 03-04-2004, 5:19 AM
 
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Re: Rev limit to 13200rpm on a 954 .

Quote:
Originally Posted by FullForce
Wait just a minute guys. The 954 isnt going to benefit 1 shred from revving it to the moon because they have reached peak power before 12k. You probably wouldnt hurt it to take it to 13k in short blast but it would slow the bike down something fierce. You would have to add alot of breathing to the bike to get it to where it makes power up that high. Bigger valves, ported heads, and alot more duration on the cams.
Read the above post! Also there are times when your blasting through the twisties and between two corners you need just a little more yet its not feasable to change up only to have to instantly change down again! in these situations a little more over rev can be quite handy.

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post #8 of 58 Old 03-04-2004, 5:47 AM
 
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Re: Rev limit to 13200rpm on a 954 .

Quote:
Originally Posted by Paul Armstrong
"Now before anyone asks do you really need all this extra power on the street, first go and ask everyone who is going to buy any of the new 04 models this same question!"
Right on!!
Good point
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post #9 of 58 Old 03-04-2004, 6:36 AM
 
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Re: Rev limit to 13200rpm on a 954 .

Ok, Im just going to have to disagree. There is just no need to put that bike in that RPM range where its down on power IMO.
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post #10 of 58 Old 03-04-2004, 12:25 PM
 
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Re: Rev limit to 13200rpm on a 954 .

Quote:
Originally Posted by FullForce
Ok, Im just going to have to disagree. There is just no need to put that bike in that RPM range where its down on power IMO.
On the track it is very useful, even if you're not in the fat part of the torque curve, a bit of overrev is helpful. We don't know what Howie is doing with his bike, so we can't assume it's street only.

As far as who needs more power, that question is just ridiculous on a board where most of us own open class sportbikes.




Last edited by luvtolean; 03-04-2004 at 12:26 PM.
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post #11 of 58 Old 03-04-2004, 3:04 PM
 
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Re: Rev limit to 13200rpm on a 954 .

I would pay through the nose for an extra 500 RPM in at least 2 places at Grattan. I wouldn't care if it was just free spin as long as it doesn't start going backwards (what happens when you hit the limiter). You get spoiled on 2 strokes, because if you jet them correctly, you can usually find at least 1K of over-rev, the only penalty being crank life and if you are meticulous about maintenance, it's a non-issue.
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post #12 of 58 Old 03-04-2004, 3:58 PM
 
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Re: Rev limit to 13200rpm on a 954 .

Quote:
Originally Posted by abtech
I would pay through the nose for an extra 500 RPM in at least 2 places at Grattan. I wouldn't care if it was just free spin as long as it doesn't start going backwards (what happens when you hit the limiter). You get spoiled on 2 strokes, because if you jet them correctly, you can usually find at least 1K of over-rev, the only penalty being crank life and if you are meticulous about maintenance, it's a non-issue.
Good point, Ab! it's like the section of track between turns 4 and 5 at Willow--some of the faster guys can grab a gear going downhill, then shift back before turning inot 5 (an off camber, downhill left hander)--I like to keep it in third and use the over-rev to get me through 5 (on my highly-modded TL1000R, I removed the first "soft" limiter, extending the rev range by about 500 rpm)...

Last edited by Erwin8r; 03-04-2004 at 3:59 PM.
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post #13 of 58 Old 03-06-2004, 11:43 PM
 
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Re: Rev limit to 13200rpm on a 954 .

For holding a gear longer alone it would be worth it, but does anyone know what the actual flow restriction would be at 12.5+k?

It could be intake track and/or intake velocity stacks/air box, intake ports on the head, exhaust ports on the head, header, or vavles and/or cam (but I doubt it), or more than one.

Most of the graphs I see of full systems and tuning, the hp does not start to drop off (unlike stock). Maybe without other mods the hp would at the very least stay the same till 13.5k, in which case when you go to the next gear you would start at a higher hp level than before.

Last edited by Powershift; 03-06-2004 at 11:45 PM.
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post #14 of 58 Old 03-09-2004, 2:42 AM
 
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Re: Rev limit to 13200rpm on a 954 .

Quote:
Originally Posted by FullForce
Ok, Im just going to have to disagree. There is just no need to put that bike in that RPM range where its down on power IMO.

You really r a misguided 1.

Maybe a SCOOTER is really what you would feel more at home with!!
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post #15 of 58 Old 03-09-2004, 4:20 AM
 
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Re: Rev limit to 13200rpm on a 954 .

An extra 800RPM is worth having if the bike is tuned to cope with it. I guess that would mean a blueprinted crank, gas flowed head and higher lift cams. Probably a full system too.

If you look at torque and power curves over the last ten years, all the manufacturers have really done is increase revs to increase power.

Last edited by DavidW; 03-09-2004 at 4:21 AM.
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