New mappable Lambretta ignition from Charlie Edmonds......

[drunkmunkey6969]

......i understand one is being brought out, it has been tested on road and dyno (and at Elvington at the last sprint meet) and is producing up to 30% more power through the midrange etc. Resulted in better top speeds on the sprint track when tested back-2-back against the previous non-mappable ignition fitted.


Anyone got more info or pictures???

[rbgaz]

hi monkey, could u explain for me what a mappable ignition is , cheers

[DigDug]

It means you can preset your timing to alter it across the rev range.

[Muppet]

It means you can preset your timing to alter it across the rev range.

how

[drunkmunkey6969]

hi monkey, could u explain for me what a mappable ignition is , cheers

In laymans terms...

Standard ignitions fire at a fixed point...whatever the mechanic sets it at, say 17 degrees before top dead centre (17 BTDC) or 19 BTDC etc.

The currently available advance/retard ignition boxes can be added to retard the ignition in a linear fashion, for example they might start at 20 BTDC and retard back 1 degree every 1000rpm.
So 20BTDC@1000rpm, 19BTDC@2000rpm, 18BTDC@3000rpm and so on.....

However a mappable ignition can go back and forth in any direction, any amount of degrees. So maybe 20BTDC@1000, 15BTDC@2000 18BTDC@ 3000 etc...any amount in any direction at any RPM.

It creates 3D maps like this:


Ignition adjustment example PS11 by Scooterotica Scooter Garage, on Flickr


pgm-2-2 by Scooterotica Scooter Garage, on Flickr


This all helps to broaden power-bands and extend RPM ranges effectively.

[Muppet]

But how do it do wot it does?

[drunkmunkey6969]

But how do it do wot it does?

Fairy dust and magic....

[Muppet]

But how do it do wot it does?

Fairy dust and magic....

Send me sum

[drunkmunkey6969]

But how do it do wot it does?

Fairy dust and magic....

Send me sum

The pixies have it all.....

[Muppet]