Does a 33bhp restricted bike have less acceleration?

[Marc_Buck]

Will a restricted vfr 400 have less acceleration than an unrestricted one?

[Ninja]

only after a certain point - initial bottom end should be identical
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James
4 wheels transport the Body ... 2 wheels transport the SOUL

[jayluvmito]

not if the restictors were to...fall out...
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one day...

[loply]

https://www.loply.com/loply/33bhp.JPG

My very unscientific diagram should show how the two bikes will be (roughly) identical up to a certain RPM, at which point the restrictions begin to take effect.

So acccelerating at less than 33bhp on either bike will be identical, only whence the unrestricted bike taps into the 40bhp+ will it be different, though I cant say what revs that occurs at.

[Marc_Buck]

So where i will be using the speed the most will be the same......that's ok because i do not plan on going 100+ everyday.

[Robby]

Yes.
Restrictors make it slower all over the rev range. I had a vfr400 restricted and then unrestricted. It was slower in all ways restricted. And it ran worse.

[Ste]

Well that will be quite hard to do 100+ as the top speed with 33bhp is about 105mph.

33bhp does affect the bikes perfomance and responce though the entire range, well once you're asking the carbs to let more fuel in but it's being limited by the restrictor you're going to not be accelerating as fast as a un-restricted bike would be.

[jay12329]

I took my 33bhp hornet round cadwell, it takes a bit longer to accelerate, but is still al ot of fun. So yes a restricted bike will accelerate slower, but 0-30/45 mines still fast, then its still faster than anything with four wheels to 80.
J

[Visitor Q]

Dont listen to the nonsense about restricting ANYtHING to 33brake. I rode a divvy 600 for 3 weeks that was restricted to 33brake, was slow as fuck to 40, from 40 to 80 good pickup, then crawled up to about 110. Lurched into corners, etc.

Just kills the bike

Get a 33brake standard bike, such as what i have. It may be weakish, but it feels like it belongs like that.
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[Mr C]

I've never thought about this but I think the diagram is flawed

The peak power will be in roughly the same place presumably but it will get there slower as the shape of the curve will not change to a flat top as you show it

The line will be at a shallower angle to peak as there is less fuel/air to make power throughout the range

more like this I'm guessing - can anyone confirm?
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[Marc_Buck]

Will an nsr 125 beat many cars on pull away?

[Frost]

[jay12329]

If i had the money i could get mine dyno'd to find out what the power looks like. I have no problems with it. like i said i managed cadwell fine.
J

[Visitor Q]

Just for the crack someone should take a big bored busa and restrict it to 33brake. No really its just as good a bike... Really.

Stupid 33 brake restriction bollocks. Surely a speedo trip that cuts throttle after you hit 70 for two years would be better. But since the top speed limit alledgedly IS 70 they might extend that to everone..........


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China traffic/travel bike vid - When I make a sweeping statement, please add the word 'statistically' in to the sentence before you bitch...
From September 2014 to January/February 2015 I will not be using any English, nor reading any. As such, I won't be on here. PM at will, but I won't be checking/posting unless in emergencies. Certainly not for the first couple of months. Please berate me savagely if I break that rule...

[Frost]

[Visitor Q]

[Kickstart]

Hi

Think Mr C is probably correct to an extent. The engine is likely to perform in much the same way as it would if you used no more than, say, 1/4 throttle. It probably would peak at lower revs, but not at the revs that it would produce 33hp when unmolested.

All the best

Keith
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[Dr Nick]

[tatters]

same hear with my VFR400 and KR1S l,m 17 on a restricted lience no restrictions but if l crash insurance company would,nt be happy
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[maverick]

I have a VFR400 and it is OK till I get to 10000rpm/135kph and then it starts wallowing around like it is running out of fuel.. Does this sound like a restricted bike to those in the know??

Jim

[skyline]

[Frost]

I'm supprised they actually let you drive in japan, and dont have a madatory computer controlled system which drives perfectly for you

[G]

[fuzz]

[billy whizz]

Had a chat with my cousin over this thread, quite an interesting subject. He works at Ricardo engineering (they design engines) he said the curve would be nothing like the original machine. This is because the power curve of the unrestricted machine depends on the induction circuit remaining exactly as designed (just think about porting and polishing). So if you put a restrictor in the induction circuit you destroy this, also the engine relies to some extent on the fresh charge of fuel air mix to purge the cylinder of exhaust gasses, this effect is also lessened at certain rpm (to do with frequency regeneration so i'm told ) which accounts for the feeling of the bike lurching around.
Taking all this into consideration you can see why an engine designed only to produce 33bhp does it so much better than a restricted one!
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