Rumor about restriction, but is it true

[nutter]

A mate of mine at work said having a restrictor fitted only effects the top speed of a bike, not the acceleration, as thats more to do with torque and the transmission. Is this true, if it isn't then I'll change my next bike from a gsx650f to something more sedate, no point having all that power and not been able to tap into it.

Many thanks
Mark
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Current bike is kawasaki ZR7 - Previous is CBR 125 (40,000 long long miles). Mod 2 passed 11/08/11 - Hope to become an instructor

[chris-red]

[Tristan.]

Essentially the restricting washers act the same as not letting you open the throttle fully, so it effects how quick the revs build up, and what it revs to. Most torque curves follow the power curves, so a motor which builds up torque and power at similar revs will lose it's higher torquey bits anyway, but one which has a flatter torque curve than power will generally take the restriction better.


[edit] oh yeah, and just to agree with Chris, it isn't quite as simple as torque = acceleration and HP = top speed.

[chris-red]

[Wafer_Thin_Ham]

Depends what type of restriction you're talking about.

I presume you're refering to the 33bhp restriction though, which limits power. This affects both acceleration and top speed.

If you're refering to a top speed limiter like the 186mph limiters that many new bikes come with these days then they only affect top speed.
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[Kickstart]

Hi

Does affect everything, but top speed is pretty much limited by aerodynamics.

With acceleration it will depend on what revs you are at. Eg, doing 50 in top and just opening the throttle on many bike it would probably be a while before the revs got to a point where it would make more than 33hp anyway, and the effective extra throttle of not being restricted wouldn't make much (if any) difference at low revs.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[nutter]

Thanks

I thought it was too good to be true

Having said that, i've just seen a GSX650F up close and i now have my heart set on it

Many thanks
Mark
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Current bike is kawasaki ZR7 - Previous is CBR 125 (40,000 long long miles). Mod 2 passed 11/08/11 - Hope to become an instructor

[ms51ves3]

[Kickstart]

[nutter]

Yeah, I've considered the SV. It just looks too much like by CBR 125 from the front, and the gsxf is closer to the bike i really wanted, a gsxr, but insurance has discouarged me on thgat front (£1500 TPO is the BEST i can get, worst was over 10k).

Also, I'm one of these who likes to be colour co-ordinated (the only part of my life which is co-ordinated LOL) and they dont do a SV650 sport in blue/white

Many thanks
Mark
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Current bike is kawasaki ZR7 - Previous is CBR 125 (40,000 long long miles). Mod 2 passed 11/08/11 - Hope to become an instructor

[Damon]

[Ariel Badger]

[MaybeGuy]

[ms51ves3]

[MaybeGuy]

i got quotes on a K4 before i got it, and they were still around the 600 mark.
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!!
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

[Pete.]

I bought a NC23 which had restrictors fitted and it was 'orrible to ride even at low revs.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[ZaphodBeeble]

[Kickstart]