Rev limiter question

[WhiteStripe]

I have a 2006 S2R 1000 - my understanding is that there is a rev limiter, but haven't been ab;e to find anything formal on this. 
Curious to learn at what RPM fuel cuts on stock programming.  Also assume it will not work on an inadvertant downshift?

I actually overspun a car engine at the track many years ago on a 3/4 shift that ended up in 2 - jsut got to thinking how easy that would be on a bike.

ANyone want to educate me?

[herm]

i also have an 06 s2r1000. you should be able to find the rev limiter right about 8700 rpm's. it will kick in any time you exceed that rpm.
you will know when you hit it.

[vw151]

yep, right around 8700.  It hits pretty hard.  if you make an inadvertant downshift the sure the rev limiter will stop the engine from producing power but if the engine is spinning faster than it's supposed to do to the gears turning it from forces coming from the wheel then there isn't much cutting fuel and spark is going to do aside from letting you accelerate more. 

I went to a rapid bike module and now my rev limiter is at 9100 and it hits a lot softer.  Not sure why,  maybe someone could chime in and let me know what is happening here.  Well I know why it is at 9100 but not why it's softer. 

[Holden]

I went to a rapid bike module and now my rev limiter is at 9100 and it hits a lot softer.  Not sure why,  maybe someone could chime in and let me know what is happening here.  Well I know why it is at 9100 but not why it's softer. 

Maybe because it's making even less power at 9100?

[WhiteStripe]

if you make an inadvertant downshift the sure the rev limiter will stop the engine from producing power but if the engine is spinning faster than it's supposed to do to the gears turning it from forces coming from the wheel then there isn't much cutting fuel and spark is going to do aside from letting you accelerate more. 

Most cars now have gates or other fail safes that will not let transmission engage at engine speeds greater thatn a certain limit - not surprise to the bikes do not.

Thanks on the 8,700 - before i bounced it (on purpose of inadvertently) wanted to be sure it existed.

[DW]

In my experience, downshifting to far on a motorcycle results in just sliding the rear end.  I think it would be very hard to overrev a Duc by downshifting. 

[herm]

i agree with the downshifting statement..........just gonna skid the rear. also, the time it takes to downshift, plus the clutch in will drop your rpms enough that it should not be a big deal

it is a good idea to find the rev limiter intentionally a couple times. helps to know where it is and what happens before you meet it in a more technical environment.

[Scottish]

i agree with the downshifting statement..........just gonna skid the rear. also, the time it takes to downshift, plus the clutch in will drop your rpms enough that it should not be a big deal

it is a good idea to find the rev limiter intentionally a couple times. helps to know where it is and what happens before you meet it in a more technical environment.

Right? It's not like it's gonna hurt anything, that's why it's set where it is to keep you from hurting anything.

That said I did pee a little the first time I hit it, I thought I did break something.

[psycledelic]

I highly recommend becoming familiar with the limiter intentionally.  I met my rev limiter for the first time while passing a car with on coming traffic.  Classic case of a newbie asking a little much out of his bike. 

[ScottRNelson]

Most cars now have gates or other fail safes that will not let transmission engage at engine speeds greater than a certain limit - not surprise to the bikes do not.

Name ONE car with this feature.  My 2005 Mustang doesn't have it.  My Honda S2000 didn't either.  Or were you talking about automatic transmissions?

I'll often hit the rev limiter on both my ST2 and 888 when I'm accelerating hard and not paying enough attention to the tachometer.  Both of those bikes are more than happy to run right up there.  The limit is 9500 on the first one and about 10,000 on the second.

One advantage of desmodromic valves is that you're less likely to damage anything by over-revving the engine.  My biggest concern would be stress on the connecting rods and pistons.  The rev limiter should protect you from hurting anything while accelerating.  If you shift down too early you're more likely to slide the rear tire than hurt the engine.  The rev limiter won't help any, though.  The trick there is to be quick on the clutch when you realize you've screwed up, then to pay better attention next time.

[WhiteStripe]

Name ONE car with this feature. 

Maybe i am out in left field on that - it was my understanding that BMW's and most newer OBDII cars now have computer control - but i stand corrected. thanks.

I overred my M3s at Limerock on the last right hand downhill coming into the straight; my fault but they were infamous for weak tranmission mounts and sloppy gates and had a spate of misshifts 3/4s going to 2nd.  Spent a lot of time and money on that mistake, at the time (late 90s) there was a lot of talk about creating computer gating into second - just did a little reading, appears did not happen.

I grew up with karts adn cars, but am very new to street bikes and still learning - that was an expensive lesson on making a mistake at the track that i coudl have avoided by being better educated and more careful.

Great point on rear end sliding.  Thanks for the help.

[greenohawk69]

In my experience, downshifting to far on a motorcycle results in just sliding the rear end.  I think it would be very hard to overrev a Duc by downshifting. 

My experience also.