LS1 timing retard switch diagram
12-10-2003, 07:52 PM
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LS1 timing retard switch diagram ok, had some ideas about how I could do this circuit so I fired up autocad and drew this, I think it would work quite well 
ill redraw something later *edit*
of course the resistor the right table to edit has to be picked out but thats just trial and error.
ill redraw something later
*edit*of course the resistor the right table to edit has to be picked out but thats just trial and error.
Last edited by Nickn20; 12-21-2003 at 03:53 PM.
12-11-2003, 10:04 AM
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Here's a simplified version with only one relay.. I can't remember if the IAT sensor is grounded or is sourced though, so it might not hook to ground on the one side. It might hook either to a 5V reference line on the PCM, or to +12V I can't remember 
12-20-2003, 10:50 AM
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It seems to me the simplest way to do this would be.
You have two wires going to your IAC. Run one wire to the common post of the relay. Put two resitors on the other wire. (One that reads high temp/one that reads low temp) Hook the other end of one resistor to the normaly open (The one that will give you the high temp reading so the computer will take timing) Hook the other end of the second resistor to normaly closed. (The one that will read low temp so no timing is taken)
Have this relay arm with your nitrous.
You have two wires going to your IAC. Run one wire to the common post of the relay. Put two resitors on the other wire. (One that reads high temp/one that reads low temp) Hook the other end of one resistor to the normaly open (The one that will give you the high temp reading so the computer will take timing) Hook the other end of the second resistor to normaly closed. (The one that will read low temp so no timing is taken)
Have this relay arm with your nitrous.
12-20-2003, 12:34 PM
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Originally Posted by Brains
Here's a simplified version with only one relay.. I can't remember if the IAT sensor is grounded or is sourced though, so it might not hook to ground on the one side. It might hook either to a 5V reference line on the PCM, or to +12V I can't remember
The IAT sensor is ran off of a 5v reference circuit.
