how exactly does the rev limiter work? - Speedzilla Motorcycle Message Forums
 
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post #1 of 20 (permalink) Old 07-10-2006, 07:10 PM Thread Starter
 
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how exactly does the rev limiter work?

Just for curiousity sake. How does the rev limiter work? I know theres a soft limiter and then the hard limiter kicks in. What limits the revs? Is it a timing retard for both the soft and hard? Does it work in neutral? My buddies GXR wont rev above about 6k in neutral? I know I can rev up way higher than that in neutral... Thanks for the knowledge!
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post #2 of 20 (permalink) Old 07-10-2006, 07:15 PM
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The soft cuts fuel to the front cylinder at 9500and the hard interupts the ignition at 10200.
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post #3 of 20 (permalink) Old 07-10-2006, 08:27 PM
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Quote:
Originally Posted by Seattle51
What limits the revs?
Predetermined functions, programmed into the ECU, based on RPM readings.

If XYZ RPM is reached, perform *this* function._________________.


The rest is like Eviltwin-05 said........

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post #4 of 20 (permalink) Old 07-10-2006, 08:57 PM
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The Europeans have far craftier mods to their superbikes. I read in a British magazine about a literbike that produced precisely 100 hp at the rear tire - I suspect they were retarding the ignition as the RPM climbed to achieve that.
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post #5 of 20 (permalink) Old 07-10-2006, 09:13 PM
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Quote:
Originally Posted by canuck51
The Europeans have far craftier mods to their superbikes. I read in a British magazine about a literbike that produced precisely 100 hp at the rear tire - I suspect they were retarding the ignition as the RPM climbed to achieve that.
You can program ECU's to almost anything, based on what sensors you have feeding it information. (ECU can stand for both ENgine Control Unit, and Electronic Contol Unit)

If you only want a certain RPM /speed in a certain gear before it cuts out, it can be achieved, by using input from a speed sensor, gear selector sensor and your engine Ignition. (RPM) How the ECU reacts is based on how it's programmed, and told to do.


In certain circles, It's called traction control....

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post #6 of 20 (permalink) Old 07-10-2006, 09:54 PM
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The 100BHP tweek only works in Germany and possibly France. UK bikes are full power and only have a hard rev limiter I believe

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post #7 of 20 (permalink) Old 07-10-2006, 09:59 PM
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So then the question becomes...can we use the 999's Dynojet Rev-Extend?


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post #8 of 20 (permalink) Old 07-10-2006, 10:04 PM
 
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Quote:
Originally Posted by EvilTwin-05
The soft cuts fuel to the front cylinder at 9500and the hard interupts the ignition at 10200.
Mine is a u.s spec bike and i have a soft rev kit to put on but, mine seems to pull way through 9500 all the way up till it falls on it's face at the top. I've never noticed anything at 9500??? i guess monday at TWS i'll make a run and stick it at 9500 and see if i can feel it.

thanks for that bit of info
i have to check it out
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post #9 of 20 (permalink) Old 07-10-2006, 10:32 PM
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Quote:
Originally Posted by EvilTwin-05
The soft cuts fuel to the front cylinder at 9500
9200 & it's done with the ignition not a fuel cut off


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post #10 of 20 (permalink) Old 07-11-2006, 12:37 AM
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LDH, so it only kills spark to the front at 9200 then?
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post #11 of 20 (permalink) Old 07-11-2006, 12:38 AM
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Quote:
Originally Posted by danniedavis
Mine is a u.s spec bike and i have a soft rev kit to put on but, mine seems to pull way through 9500 all the way up till it falls on it's face at the top. I've never noticed anything at 9500??? i guess monday at TWS i'll make a run and stick it at 9500 and see if i can feel it.

thanks for that bit of info
i have to check it out
If you have the soft REV done you will not have anything happen at 9200.
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post #12 of 20 (permalink) Old 07-11-2006, 12:41 AM
 
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Quote:
Originally Posted by EvilTwin-05
If you have the soft REV done you will not have anything happen at 9200.
yeah that's the puzzling part.. I do have the soft rev limiter LOL in my tool box. Now i'm really interested in what's going on LOL come onnn monday LOL.
I've looked at right where the thing goes but, there's not one on it. hmmmm we'll see... on monday
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post #13 of 20 (permalink) Old 07-11-2006, 02:53 AM
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Maybe you have an Aussie ECU.
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post #14 of 20 (permalink) Old 07-11-2006, 03:34 AM
 
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hmmm never know i'll look it over real close
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post #15 of 20 (permalink) Old 08-22-2006, 08:29 PM
 
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New to the board and the RC51 world but love the bike so far! Not sure what has been done to my bike before I bought it a couple of weeks ago ('01 with 11,000 miles) but I do know it doesn't have any soft limiter at 9,500. Mine is hitting the wall at an indicated 8,500 RPM.

No where close to the indicated red line of 10,000 and just when it starts to get fun!

Not around my bike now so can't open it up and tell you any more info about what work has been done to the wiring harness (does have an alarm...) but any info would be greatly appreciated and I'll open it up over the weekend and let ya'll know how it goes.

Thanks!
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post #16 of 20 (permalink) Old 08-23-2006, 04:48 AM
 
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Quote:
Originally Posted by EvilTwin-05
Maybe you have an Aussie ECU.
what is the go with that then? mine is Aussie, am i speacial?
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post #17 of 20 (permalink) Old 08-23-2006, 07:03 AM
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My CBR400RR had a tab under the speedo that turned with the speedo needle and it passed between two parts on a circuit board and the bike wouldn't go over 120mph, I pulled out the tab and hit 145mph




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post #18 of 20 (permalink) Old 08-23-2006, 12:37 PM
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OK Dannie,

So tell us what happened on the high banking at TWS? (wish I could've gone)...
I hope you were able to install the softrev kit before you went...

Quote:
Originally Posted by danniedavis
Mine is a u.s spec bike and i have a soft rev kit to put on but, mine seems to pull way through 9500 all the way up till it falls on it's face at the top. I've never noticed anything at 9500??? i guess monday at TWS i'll make a run and stick it at 9500 and see if i can feel it.

thanks for that bit of info
i have to check it out
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post #19 of 20 (permalink) Old 08-23-2006, 01:06 PM
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Quote:
Originally Posted by PedroSP2
what is the go with that then? mine is Aussie, am i speacial?
I tested an Australian ECU (both on the bike & on a scope) & it was much better than any of the other regions as far as outright performance. I don't remember all the details as it was 3-4 years ago, but I seem to recall it had better fueling & much improved ignition curve. I also noticed you guys don't have PAIR systems on top of your valve covers either. I figure your Environmental laws are a little less strict than other countries or maybe it is the grade of your fuels that affect the way your bikes are designed etc, but you end up getting a slight advantage over what the rest of the world is given.


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post #20 of 20 (permalink) Old 08-24-2006, 08:57 AM
 
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wow thanks LDH, thats actually quite interesting. might explaing why my dyno came out better than expected. not too sure on the emisions laws here, they are probably quite slack compared to yours seeing as they are conviced burning coal is the best way to run a lightbulb..
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