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Rev Limiters


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On 11/6/2019 at 5:09 PM, Sings4Speedway said:

Also is the 4 years of silencer homogenisation not up so there could be potential new models added to the usable list?

EDITED POST

The current homo-program is so, that you get the silencer homologated and each year stamp it with a production year. U cant use silencers over 5 years old. For what I know thats the plan high up how to continue, no change to decibel levels in the foreseeable future...

Edited by f-s-p
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On 11/6/2019 at 6:13 PM, *JJ said:

Riders just go for the cheapest one! We had a Prodrive silencer at one time; this was much better quality than the most common type, but cost twice as much so noone bought them! Before you ask, they were selling them off cheap as remaindered stock.

Prodrives were the ones to have when they were introduced.

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12 hours ago, jenga said:

i think it was VW that had a form of rev limiter built into the early rotor arms of their ignition system . when the centrifugal force  spun the rotor arm past a certain RPM  , a small spring would open up and cut out the electrical circuit  to the dizzy cap and the revs simply stopped .  dont think they have anything like that nowadays . its all ecu,s and other things .. but as they say on here , the moment you back the throttle off , as speedway bike speeds up ! 

jeez , is that the time ?

Hit the rev limiter on a modern bike and all that happens is you get a slight misfire, much more like an over rev on an old engine than backing the throttle off. Points bounce was always a good indication you had reached 8000rpm and needed to fit electronic ignition in the old days too.

Road bikes now have all sorts of traction control and anti wheelie options. Even my flat track bikes have mapping choices and start options that are basic traction control, it all works flawlessly, whether you need it or it is desirable is another story, I've used the same map since I've had the bike I use and never bothered with the start option. From 2019 the Yamaha YZ450 MX bike has had the option to connect to it via Bluetooth and make quite significant changes to the fuelling and timing from your phone. I've been tempted by that, not because I'd need it but I'd enjoy playing with it!

I can't see the set up suggested for Speedway doing any harm at all and it may well have some benefits, especially if the option to gradually lower limits was used.

 

 

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On 11/9/2019 at 8:19 AM, f-s-p said:

EDITED POST

The current homo-program is so, that you get the silencer homologated and each year stamp it with a production year. U cant use silencers over 5 years old. For what I know thats the plan high up how to continue, no change to decibel levels in the foreseeable future...

From what i am aware the major supplier of silencers across the UK are all marked and marketed as 2015 KING silencer. Even purchasing one this season will see it stamped 2015 so are you saying that everyone is being slightly tucked up and after the 2020 everyone will need to replace everything they own? 

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1 hour ago, Sings4Speedway said:

From what i am aware the major supplier of silencers across the UK are all marked and marketed as 2015 KING silencer. Even purchasing one this season will see it stamped 2015 so are you saying that everyone is being slightly tucked up and after the 2020 everyone will need to replace everything they own? 

Not really sure, but...

is that the homologation stamp or manufacturing year?

 

 

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16 minutes ago, f-s-p said:

Not really sure, but...

is that the homologation stamp or manufacturing year?

 

 

Below are the list of homogenisation numbers i can find. Unless i am reading them wrong most relate to 2015. I also can't recall seeing a manufacture year stamped onto any silencer (however i will confess its been a while since ive looked closely and the heat shields do hide a lot of the markings so will probably have to defer to someone more knowing?

DEP T10 FIM TRS 2015D

DEPT15 Free Flow FIM 26 AY 15

King “2015” FIM 071 Y 15

MOTAD FIM 091 T46

POLDEM 2 FIM 06 BP 78

REMUS V4 FIM 10 CT15

REMUS V7 FIM11 V15 
  

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10 minutes ago, Sings4Speedway said:

Below are the list of homogenisation numbers i can find. Unless i am reading them wrong most relate to 2015. I also can't recall seeing a manufacture year stamped onto any silencer (however i will confess its been a while since ive looked closely and the heat shields do hide a lot of the markings so will probably have to defer to someone more knowing?

DEP T10 FIM TRS 2015D

DEPT15 Free Flow FIM 26 AY 15

King “2015” FIM 071 Y 15

MOTAD FIM 091 T46

POLDEM 2 FIM 06 BP 78

REMUS V4 FIM 10 CT15

REMUS V7 FIM11 V15 
  

Those are homologation stamps. And I believe Motad is no longer valid as the manufacturer withdrew the product after being granted the stamp. Will look into this myself later on...

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