Ive been playing with the idea of making my own turbo timer using a 555 timer in monostable and just having a toggle switch to give it vcc so you can control when you want the timer to come on(whenever current/voltage drops to near ground, thats what i need to know, Qs below).

The only things that seem somewhat difficult is picking how to have the 555 interact with the car to keep it running. What is it that is actually keeping the car on? I cant really figure out a way to have the timer interact with the car until i know how the car usually operates and knows when to turn on/off(is it voltage, current, and in which wires). if anyone has ever played around with or done this or just has any info post it, thanks.

 

ive found that jaycar makes a kit for 29.95. if anyone has its schematic that would be really helpful too.

 

two things.

One, you could just use a pulse timer relay, and wire that up to the ignition. I would think that this would be the simple-est. (and cheapest)

Two, I have an apexi TT that I will let go for cheap, it could save you some time...

just my two cents.

 

there should only be 2 wires in the key harness that need 12 volts after the car is on the keep it running,my experiance from doing remote starts when i used to be an installer.some may require 3 .just pull the cover off of the steering colum,with the car turned on ,probe the 6(i think its about 5 or 6 wires) wires that come right off the key,one will be constant 12v from the battery,one will be the starter wire,maybe 2 accessory wires and a igniton wire,one of the accessory wires will run the A/C and the other will run the radio.its just a matter of probing them with the car on and with it off.hope this helps.