Couple of 954 questions (performance/vibration) - Honda Motorcycles - FireBlades.org
Honda FireBlade Discussion of the Honda CBR 900RR, Honda CBR 929RR, Honda CBR 954RR, and Honda CBR 1000RR Motorcycles.

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post #1 of 29 Old 06-12-2017, 9:19 PM Thread Starter
 
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Couple of 954 questions (performance/vibration)

I purchased a 954 that I have been riding here and there for the past few months. The bike is really fun and handles great but seems to be lacking low end power. As of now it only has a slip on exhaust (which I know is fairly useless for power). The bike does really come alive at about 8000 rpm and pulls hard, but below that just seems pretty flat. I did drop a tooth up front which helped the acceleration. I guess my question is, is this typical for these bikes? In defense of the 954 I am comparing it to my 2014 zx14r which put down 204 horsepower and almost 120 ft pounds to the wheel. I have never dynoed the 954. Would my 954 make some good gains from a full system and a power commander? One thing I do want to point out that I feel is hurting the low end. When I got the bike the exhaust valve as well as the valve in the airbox were removed by the previous owner.

The other issue is the vibrations. I feel a lot of vibrations in the handlebars and pegs. I have done plugs/air filter/throttle body sync/heavier bar ends/tightened all the engine mount bolts etc. to try to remedy the issue. These have made the vibrations a little less but it still is very "buzzy". It is definitely engine related. The only other thing I can think it may be is possibly a broken clutch fiber. Any other ideas on what it could be? Or is this typical for these bikes? Thanks for any info or feedback. I know it seems like I'm slamming the 954 a little bit (which I am not, its a fun little bike). Maybe I'm just spoiled with the zx14r. That thing is like a super fast couch lol.
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post #2 of 29 Old 06-13-2017, 1:53 PM
 
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Re: Couple of 954 questions (performance/vibration)

if you come from a 14r it's going to feel weak on the low-end for sure
to have fun you need to keep the bike above 7k all the time
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post #3 of 29 Old 06-16-2017, 10:51 PM Thread Starter
 
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Re: Couple of 954 questions (performance/vibration)

Any thoughts on how much low end power I am losing because the exhaust valve and airbox valve is gone? Anyone know the typical power gains with a full system and power commander vs just a slip on? Thanks
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post #4 of 29 Old 06-16-2017, 11:02 PM
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Re: Couple of 954 questions (performance/vibration)

The power gains are only if it is mapped correctly and there are various threads about the power loss.
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post #5 of 29 Old 06-17-2017, 9:15 AM Thread Starter
 
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Re: Couple of 954 questions (performance/vibration)

ok thanks for that info. Been doing a lot of searching on the site regarding exhaust. From what Ive read (and this being a 100% street bike) I think my best bet is to stay with stock header and slip on. Do you guys think I would benefit in any way to add all the servo motors/cables etc back on the bike? I really don't think so from what Ive read. I think I am going to add 2 teeth to the rear sprocket in addition to the -1 up front to give me some more acceleration.

Any ideas on the vibration issues I'm chasing?? Thanks guys
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post #6 of 29 Old 06-17-2017, 12:26 PM
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Re: Couple of 954 questions (performance/vibration)

Why don't you arrange for it to go on a rolling road and check what power it is pushing out, they came with 150bhp at the flywheel so should feel quick
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post #7 of 29 Old 06-17-2017, 4:31 PM
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Re: Couple of 954 questions (performance/vibration)

If it has a slip on and no Power commander there is most of the problem. I have owned three 954's, two with slip on's and one with a full Yoshimura system and they all suffered from a doughy bottom end without a Power Commander. As for the vibes I don't recall it being a problem so maybe there is another issue.
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post #8 of 29 Old 06-18-2017, 4:56 AM
 
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Re: Couple of 954 questions (performance/vibration)

The airbox valve doesn't affect power at all but from idle to 4000 the exhaust valve makes a big difference... Never tried a 1000cc bike that pulls like the 954 at low revs when the htev is adjusted correctly and it has a good tune. After 4k it is more about the commander map... I have been running a full exhaust for couple off years now and it is noticebly slower before it hits 3.5-4k
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post #9 of 29 Old 06-18-2017, 8:30 AM Thread Starter
 
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Wow thats is something to think about. I still have the servo motor (came with the bike ). How hard would it be to get the cables and valve itself to put back into the exhaust? Can the exhaust valve be used without the intake valve? I thought they ran off the same servo?? And you mention adjusted properly? I assume there is a procedure for this? Thanks guys for the feedback
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post #10 of 29 Old 06-18-2017, 10:05 AM
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Re: Couple of 954 questions (performance/vibration)

Apples and Oranges:

I've been thinking about this thread since you posted it. I've never owned a 954 or a ZX14. But I have a '94 CBR900RR and have ridden a buddies Busa and ZX11.

The 954 was designed for one track, the road course and the ZX14 was designed for another, the strip. You could throw thousands of dollars at the 954 and still never have the off the line torque of the ZX14. There is no substitute for cc's or cubic inches. The ZX14 has a whopping 487cc's more. That's like adding another CBR500 motor to your 954. On the street you spend 99% of the time below 7k. The 954 doesn't even get to 100hp until 7800 in stock form. Here's where the seat of the pants feel comes in. The ZX14 has 65ft lbs of torque at just 2500 rpm (almost instantly) where the 954 doesn't get there until the same 7800 rpm. And it only has 64ft lbs anyway where the ZX has well over 110. Road race bikes are designed to be kept on boil. The top 3-4k of the rev range is where all the power is on these bikes. Not recommended on the street unless you like tickets. On top of that, the device that was designed to give some of that missing low end has been taken off, the exhaust valve.

These guys on our wonderful forum had done everything you can imagine to a 954 and a few things you wouldn't. It's a wonderful bike, as is your ZX14 for totally different reasons. You are lucky enough to have both. So take the 954 (the apple) to a track day at your local road course or some canyon carving, this is where these bike shine. Or, enjoy your 200hp couch (the orange) at the strip or just for a cruise. Both sound like a great way to spend a day to me.

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post #11 of 29 Old 06-18-2017, 10:35 AM
 
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Re: Couple of 954 questions (performance/vibration)

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Originally Posted by cbibb View Post
...In defense of the 954 I am comparing it to my 2014 zx14r which put down 204 horsepower and almost 120 ft pounds to the wheel...
I think you answered your own question. LOL
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post #12 of 29 Old 06-18-2017, 12:27 PM Thread Starter
 
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Re: Couple of 954 questions (performance/vibration)

Thanks for the well written reply devildog (makes a lot of sense). I think I am going to try to "undo" what the previous owner did and put the exhaust valve back in. So on that note, anybody got one they want to sell??!!
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post #13 of 29 Old 06-18-2017, 12:41 PM
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Re: Couple of 954 questions (performance/vibration)

If you really want your 954 to fly put it all back to standard, Mr Honda did a pretty good job at the factory and invested a fortune getting these bike to perform faultlessly, its funny how Gary in his pre-fabricated garage with an cheap eBay exhaust can and a pair of pliers, thinks he can do better
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Re: Couple of 954 questions (performance/vibration)

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Originally Posted by Gunk View Post
If you really want your 954 to fly put it all back to standard, Mr Honda did a pretty good job at the factory and invested a fortune getting these bike to perform faultlessly, its funny how Gary in his pre-fabricated garage with an cheap eBay exhaust can and a pair of pliers, thinks he can do better
Gunk I agree mostly. There are somethings that Honda has done to meet noise or pollution requirements and that is detrimental to the overall performance.
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post #15 of 29 Old 06-18-2017, 3:58 PM
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Re: Couple of 954 questions (performance/vibration)

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Originally Posted by Gunk View Post
If you really want your 954 to fly put it all back to standard, Mr Honda did a pretty good job at the factory and invested a fortune getting these bike to perform faultlessly, its funny how Gary in his pre-fabricated garage with an cheap eBay exhaust can and a pair of pliers, thinks he can do better
What you talking about Willis?
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