Nitrous and a wedge

[top secret]

90% of the way through a nitrous install and unfortunately a minor problem has reared its head! I need to identify the output trigger wire from the throttle position switch,(flapper valve Maf unit)and cant find it in the 'Bible' or Haynes Rover V8 manual either.
I could always dash out to Halfords and buy an all singing multi meter at ripspeed (or should that be Rip-off) prices, but thought that possibly some kind hearted, well educated bright spark may know the answer!

[blaineuk]

wedgie will be along any time to tell you

[wedg1e]

The throttle pot wiper is red, ground is green and the supply is yellow.

HTH.

[top secret]

Thanks wedg1e, will tap into the red one then!
Hopefully the nitrous will be up and running by next weekend.

[shpub]

The throttle pot is not the same as the throttle position switch . It doesn't generate a trigger pulse at all - just a variable voltage/resistance.

[rev-erend]

Post an email to Mark Adams .. he will know for sure.

[adam quantrill]

You might want to mount a seperate microswitch to tell whether the throttle is above a certain opening. An alternative would be to use a comparator on the throttle pot output (wiper) to see if it's above a preset trigger voltage. You would have to be careful to avoid picking up electrical noise in the engine bay.

[top secret]

Thanks for the info, the unit I am fitting is a 'Zex' set up and apparantly has a self learning processor that resolves the variable output voltage, so I may well rig up a tempory wiring harness first, to see if everything works.