8 to 12 magnet PAS

[djah]

I’m looking to change my pas from 8 to 12 magnet one.
Can I simply change the disc with the magnets or do I need to replace the sensor part too?
The existing one has a waterproof connector which are quite a bit more expensive than the ones with a normal connector.
So I was just going to buy a cheaper 12 magnet one and just use the disc.
Would my existing sensor be compatible with a 12 magnet disc?

 

[Amoto65]

I did it on a Viking e-bike and went from 6 to 12 and it works fine.......

 

[djah]

I did it on a Viking e-bike and went from 6 to 12 and it works fine.......

Thank you.
So, just changing the disc is fine? No need to change the sensor part?

 

[anotherkiwi]

Thank you.
So, just changing the disc is fine? No need to change the sensor part?

No the sensor is the same in most cases. You might have to set 12 magnets in the configuration menu, I didn't bother and it worked, now it is set to 12 though.

 

[djah]

No the sensor is the same in most cases. You might have to set 12 magnets in the configuration menu, I didn't bother and it worked, now it is set to 12 though.

Thanks for your reply.
Sounds good.
Does it make the motor any smoother?

 

[wheeliepete]

Does it make the motor any smoother?

Tends to make the PAS respond quicker with less crank rotation needed before it starts the motor.

 

[wheeliepete]

Smooth running tends to be more down to the way the programming runs in the controller, which you can't do anything about on alot of bikes.

 

[djah]

Smooth running tends to be more down to the way the programming runs in the controller, which you can't do anything about on alot of bikes.

I understand.
Quicker responding pas is what I’m after.
Thanks.

 

[Amoto65]

Quicker take up and smoother running for me, just be sure you order the right sized magnet disc.

 

[vfr400]

Don't waste your time and money. I bet you won't notice any difference, except that it might not work at all because some controllers don't like them. Why do you want to change it? Is it because your controller gives a delay? That won't change by using a different magnet disc.

 

[wheeliepete]

Is it just me, or does anyone else get a sense of D8veh?, bless him

 

[Nealh]

Is it just me, or does anyone else get a sense of D8veh?, bless him

Funny you should say that, I have been thinking the same thing for a few weeks now. Possibly vfr was another alias ?
.

 

[anotherkiwi]

https://www.pedelecs.co.uk/forum/members/vfr400.5808/#recent-content

Cat's out fo the bag!

 

[Nealh]

If I remember D8veh more then once referred to motor bike ownership and may have once mentioned the vfr so yes I think he has returned using the old alias.
No matter which name he posts under, welcome back .

 

[djah]

Don't waste your time and money. I bet you won't notice any difference, except that it might not work at all because some controllers don't like them. Why do you want to change it? Is it because your controller gives a delay? That won't change by using a different magnet disc.

Yeah. It’s because of the delay. Thought it would be worth a punt, only €4.
Thanks for the advice. No point if you think it won’t make any difference.

 

[Nealh]

More poles will as mentioned reduce rotation delay though depending on the controller settings may need tweaking if an lcd allows such as with KT's.
I replaced 12 pole disc one with a 10 pole one and didn't change the parameter for it and had a stuttering on/off delay with PAS/ hub sensing from the controller , after changing the parameter everything behaved as expected and no more issues.

 

[djah]

More poles will as mentioned reduce rotation delay though depending on the controller settings may need tweaking if an lcd allows such as with KT's.
I replaced 12 pole disc one with a 10 pole one and didn't change the parameter for it and had a stuttering on/off delay with PAS/ hub sensing from the controller , after changing the parameter everything behaved as expected and no more issues.

I’m using a kt-lcd3. Can you advise me on what parameters to change and to what value when changing from 8 to 12 magnets.

 

[Nealh]

C1 is the setting and value should be 2 for 12 pole disc, the 8 pole disc should be currently set at 0. Also you can adjust C14 for PAS signal strength 1 - 3 /weak to strong.
If you find that pas for some reason is a bit on/off and intermittent then try values 0 or 1 or check the sensor to disc gap is about 1mm and magnets are actually passing the sensor correctly.

 

[djah]

C1 is the setting and value 3 for 12 pole disc, the 8 pole disc should be currently set at 00.

Thanks very much.

 

[anotherkiwi]

A bit of basic geometry will tell you that 12 magnets is going to give quicker start up than 8. One third quicker to be exact. It greatly improved my riding experience. A 10 magnet disk would also be a 20% improvement.

Once you are actually turning the pedals at normal cadence there is no difference to be felt (of you have the correct number of magnets set).