Wisper "Off road " switch - Pedelec Forums

Phil the drill · #1 (**permalink**) 31st July 2008, 23:17

Hi
I've had my Wisper 905se for several months now, and I am generally very happy with it - it has performed very well.
There is one thing though that I would dearly like to address - in pedelec mode (my preferred one) the bike seems to run out of steam at about 13mph ish and certainly below the legal limit of 15.5 mph. The "off road switch" only seems to affect the motor power delivery in throttle mode. Is their any way of re-wiring this so that it will also allow the pedelec system to function up to the 18-19mph - (even the 15.5mph would help)?
I know that I can get around this to some extent by using the throttle and adding in the pedal effort, but it would be much more satisfying if it were possible to use the pure pedelec system to the full. Even using it more effectively up to the 15.5 mph would be nice.
The bike does not have a power loss problem, it is fine up inclines, and on the throttle, but just gives up a little too early (in pedelec mode) on the flat into a stiff sou'westerly.
Cheers, Phil

Wisper Bikes · #2 (**permalink**) 3rd August 2008, 14:14

Hi Phil

Thanks for your constructive comments, I have passed them on to Dick Lai at the factory for his comments.

I will get back to you.

Best regards David

The_Bike_Whisperer · #3 (**permalink**) 9th August 2008, 09:45

I have a similar issue with the 905Se motor only assisting the peddling action up to 11-12 m.p.h. in standard mode. No problem with overall power as with off-road activated the bike will go to 18 m.ph on the twist grip.

Any help would be appreciated, could this be a wiring issue, bike is only a few weeks old.

In all other repects the bike is great...

John

Wisper Bikes · #4 (**permalink**) 9th August 2008, 11:02

Hi John and Phil,

Sorry it took a while but I have the fix for you.

You will need to take the side off the controller panel which is under the battery. You will need to take out the three stainless steel bolts to do this.

You will find a grey wire leading from the controller that ends in a small black plastic cable end. (This cable continues to the de restrict button) Within the cable end you will find a small screw, simply turn it clockwise to increase the speed and anti clock wise to decrease it.

The cable end is the one in the image with the red circle around it.

Speed up std mode 60kb.jpg

If you have any difficulties please let me know.

Best regards David

The_Bike_Whisperer · #5 (**permalink**) 11th August 2008, 17:36

David, Thanks for the info, the adjustment advised will increase the max speed in standard mode when using the twist grip, but does not increase motor assist when just peddling. The adjustment screw is turned anti-clockwise to increase speed.

Is there an adjustment to raise the motor assist speed from my current 12mph to 15.5m when just peddling? Currently I have to also use the twist grip to gain motor power above 12mph.

Regards
John

Wisper Bikes · #6 (**permalink**) 11th August 2008, 17:59

Hi John

I have again sent the problem to the factory for an answer, thanks for getting back to me.

Best regards David

the_killjoy · #7 (**permalink**) 14th August 2008, 14:07

I must agree that it does seem very easy to overun the motor when in Pedelec mode, it certainly seems to run out of puff early.

Andrew harvey · #8 (**permalink**) 14th August 2008, 22:17

I don't know the Whisper very well, but I have had similar problems with pedal sensors before. ie. some just do not go as fast as others, if your sensor disc is the type with small round magnets check to make sure none have fallen out.

the_killjoy · #9 (**permalink**) 28th August 2008, 08:05

Whisperer, when you adjusted the screw did you turn it clockwise or anti-clockwise ? I have turned it both ways without any significant change. My unassisted speeds are 11 & 15 mph.

The_Bike_Whisperer · #10 (**permalink**) 28th August 2008, 13:18

I turned the screw anti-clockwise which increased the unassisted speed to about 18m.p.h without the off-road button being pressed. This now makes the off-road button redundant and allows the highest assisted speed available with or without using the pedals. This is a major improvement to the speed/rideability of the bike.

You should see a major difference in the wheel speed when adjusting the small screw. After turning the screw tilt the bike on it's side stand and watch the wheel speed when turning the twist grip. Are you sure you are turning the correct screw?

David is looking to see if there is an adjustment to raise the level of motor assist speed when using just the pedals.

Regards
John