Which wire to use for a tach signal

[IanS]

Right now Im in the process of installing an Alchohol injection system into my S14 with a Redtop SR20DET, for the system to work corectly I need a tachometer signal wire that fires once every engine revolution, its the same wire I would use if I was installing an aftermarket tach. If this had a normal ignition system with a distributer and whatnot I would just use the wire on the coil, but with the Direct spark system Im not sure what wire to use, Im thinking I either need to use the signal from the ECU for the tach or one of the wires on the No 1 coil

Any Help is appreciated, and yes I seached, I really want to get this system working befor the weekend

Thanks in advance for the help

Ian
Modified by SideWays=smiles at 12:53 PM 5/24/2007

[IanS]

bump

I need to get this thing running again

[Afliction523]

If it is the same as my ka, there is a yellow with a red stripe on the ecu. Im not sure about the sr. It might be the same.

[IanS]

well, I know which wire it is on the ECU, but Im not sure if this is the wire I should use, Im debating between a wire on the CAS, the ground for the No 1 coil, or the ECU tach signal

[IanS]

well I tried using the tach signal wire on the ECU, and the system did not activate, I dont think that wire produces the right kind of signal, I need a 1 pulse per rotation signal, cmon guys help me out here.

[Afliction523]

I would try the coil then. Try it till you get it.

[C - ROD]

look at the back of ur valvecover on the coil harness, there should be like a black wire that makes a loop on the outside of the harness & that is what u would use in order to check the timing so im assuming that its a good tack signal that fires once oer revolution

[IanS]

look at the back of ur valvecover on the coil harness, there should be like a black wire that makes a loop on the outside of the harness & that is what u would use in order to check the timing so im assuming that its a good tack signal that fires once oer revolution

yah this is what I plan on trying next, I am out of town at the moment, but I have my tools with me and I have time tomorow Im going to give it a go.

[C - ROD]

LMK if it works, as i will need a signal for my auto meter tach when i get my motor done

[CMG]

Isn't there a tach signal coming from the computer to the dash, orange wire maybe?

[redtop91]

http://www.frsport.com/SR20DET....html

[C - ROD]

but will that work with an auto meter tachometer?

[IanS]

differant tachs work with differant signals, Autometer sells a special unit to connect a tach to a vehicle with direct ignition

stop thread jacking

[IanS]

Bump, anymore Ideas?