SV650.org - SV650 & Gladius 650 Forum - Not revving past 11,500rpm in 6th

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- - Not revving past 11,500rpm in 6th (http://forums.sv650.org/showthread.php?t=169632)

Re: Not revving past 11,500rpm in 6th

Quote:

Originally Posted by hongman (Post 2587537)

How does gearing down a tooth affect this? Does it shift the optimum range up or down?

The range of the engine is the range of the engine. What altering the final drive ratio affects is the relationship between road speed and what rpm you are in at a given gear. If you made 70HP @ 9000rpm, you'd make this whatever your gearing. What you can do is make sure that at 80mph the bike's engine is either spinning slower by gearing up (giving a more relaxed ride and hopefully better economy or top speed) or spinning faster (putting you closer to peak power and giving better throttle response / making sure you aren't geared for a speed the motor can't actually achieve).

Of course, if you're geared up, you can always just drop to 5th :)

Jambo

Re: Not revving past 11,500rpm in 6th

I'll humour you :)

I cant really answer that question though. I've never ridden a 125 in the time I have had my license, only the SV.

So I guess I'll have to say like a SV, if there is such a thing. How does one ride like a SV or ride like a 125?

Re: Not revving past 11,500rpm in 6th

Quote:

Originally Posted by jambo (Post 2587544)

Cheers :)

Re: Not revving past 11,500rpm in 6th

Quote:

Originally Posted by hongman (Post 2587546)

Did you learn at all on a 125 at any point?

You see I've had the SV so long, I ride everything else the same as I ride the SV, and it doesn't work apparently. I am in process of re educating. Apart from when I feel like I've been smacked in the face like on Sunday(sinuses packed in very ill), couldn't ride a 125 properly never mind anything else:rolleyes:

Re: Not revving past 11,500rpm in 6th

I rode a 125 for my CBT for all of about 2 hours before they stuck me on a ER5 as I was doing DAS directly after!

And that was all car park low speed control stuff

Re: Not revving past 11,500rpm in 6th

Quote:

Originally Posted by hongman (Post 2587550)

I rode a 125 for my CBT for all of about 2 hours before they stuck me on a ER5 as I was doing DAS directly after!

And that was all car park low speed control stuff

ahh right, well I'll STFU lol. Was just a train of thought :p

Re: Not revving past 11,500rpm in 6th

Quote:

Originally Posted by hongman (Post 2587540)

I cant be 100%, but probably not one of my brightest moments.

I assumed actually that the extra drag of the top box (or anything else) would affect the bike in that it wouldnt be able to reach the limiter, not in the sense that the limiter cut in point would come down slightly.

If you see what I mean? Im **** at explaining what I mean.

Que? Surely that is what has happened? You've not hit the limiter and the limiter hasn't moved, but you are reaching the point (11.5k rpm) where bike can't go any faster because the engine cannot produce enough power to overcome the drag effect.

I never really get to redline my bike. 1st will wheelie and 2nd means I'm doing prison speeds! :(

Re: Not revving past 11,500rpm in 6th

For fudgeocks FUDGING SAKE!

This is TECH TALK!

Could all you whinging fudging speed limit obeying 50p piece cornering benders please bugger off back to idle banter and post pictures of kittens or something?

This is a discussion about rev limiters, speed and gearing, he didn't ask, or need, a riding lesson.

Fudges sake.

Quote:

Originally Posted by jambo (Post 2587532)

why wil the bike not hit 12k in top?

Why would the bike have managed this before but not now? Either:
1) It is making less power
2) There is more resistance

Well it won't, 'cos the rev limiter kicks in at 10200, unless you have an SV400 ECU on it, which was apparently different, but I've never seen one.

But I wouldn't rule out the fact that the rev counter is not necassarily calibrated 100% accurately, which may end up pointing at 12k though the engine isn't doing that.

Quote:

Originally Posted by hongman (Post 2587533)

I've hit the limiter in lower gears before and its quite a harsh feeling compared to what I'm feeling in top. Its almost like a soft "feathering" or hesitation.

The limiter I think may cut one pot out first, but the bike doesn't know if it's in top or 5th so any difference in limiter feeling is not related to that, may be feeling different due to aerodynamics and momentum.

Quote:

Originally Posted by dizzyblonde (Post 2587525)

The key hong, is smooth and progressive, not scrappy and aggressive.
Now I proclaim my riding is not too cracky, however people who are far more proficient say in honesty, I am on the smooth and progressive list.

Not too sure about that myself, but nowts blown up yet, and I ain't fallen off :)

Mood of the day certainly has a lot to do with it in my case. On Saturday bringing the soho crew back to base I was apparently getting a fair lick on, to me I was just bimbling! ...and thats in the rain. Rain or sun, I ride exactly the same...I don't think so, others do!

Except, you know, this is a tech thread, and not about your riding or your fudging raptor!
I've seen hong ride a bit and you couldn't keep up with him on your best day... so what is "working" and what is "the key" to?

Re: Not revving past 11,500rpm in 6th

Quote:

Originally Posted by maxinc (Post 2587478)

Bearing in mind that engines have a limited lifespan, the harder you ride them, the shorter their life. It has to do with metal friction.

The closer you are to the top range of the designed rpm, the higher the temperature and stress on components. This accelerates wear on metal, lubrication becomes more difficult as well as pretty much every component is stretched.

I think the redline is OK to hit momentarily during fast acceleration but I wouldn't consider riding a street bike at redline for more than 2 seconds.

Go try it!
Wear on metal? What's the oil film there for?
Designed top rpm, yup that's the limiter.
Components stretched, yup, they do, that's what various clearances are designed in there for.

Redline as in sat there in 2nd paggering it, no that's just stupid. Near redline in 6th cos that's top speed, no problem.

Quote:

Originally Posted by maxinc (Post 2587485)

This is where you may not get it. 12k revs in 6th gear is a LOT more load on the engine than 12k revs in 3rd gear. The wind resistance at 120+ miles an hour is tremendous and that translates into more fuel being burned and hotter engine.

Versus the heat transfer properties of 120mph airflow, it doesn't make it run hot.
It's the same load, just a transient one while accelerating not a steady one. No difference.

I've had mine flat out, down on the tank, fair enough it wouldn't hit the limiter (naked bike), for MILES. Almost for a full tank of fuel at a time on several occasions. It's now got near on 100k on it, maybe even just clicked over.

Quote:

Originally Posted by hongman (Post 2587487)

the SV?Or a combination of other factors that determines cut in point?

When the ECU gets to a certain frequency it stops making sparks, nothing mechanical, all electronic.