[SIstomper]

Since our car has no physical tach wire the only way to get a proper signal is tap the coils. Aux controllers use the same method built in so this is more for the guys that have nitrous and meth controllers or need a tach signal for external knock sensor setups. Excuse the hand drawing. @Bigmike7645 @BlackT5 @djfourmoney @DDT1972

 

[djfourmoney]

So you pulled from all four coils?

I only pulled from one, but we'll see when we test the output.

 

[SIstomper]

So you pulled from all four coils?

I only pulled from one, but we'll see when we test the output.

One will do you no good unless you multiply the signal by 4. Been done. When I first did aux I used a tach adapter from split second. Gave a dirty signal so I removed it and used one tap. RPM was 1/4 of value. Ended up building cable with all four taps, issue gone

 

[djfourmoney]

Will do... Thanks for the feedback.

 

[SIstomper]

If the controller has a signal multiplier you'll be good

 

[kshatt06]

If the controller has a signal multiplier you'll be good

What would we do with out you @Slstomper

 

[SIstomper]

What would we do with out you @Slstomper

View attachment 210265

Stop, Bigmike asked me about the signal so I figured I'd post it for everyone just in case.

 

[kshatt06]

Stop, Bigmike asked me about the signal so I figured I'd post it for everyone just in case.

You are one of the people on the forum that have a lot of good information and are there for a helping hand when it is needed just giving recognition to who and when it's deserved.

 

[SIstomper]

You are one of the people on the forum that have a lot of good information and are there for a helping hand when it is needed just giving recognition to who and when it's deserved.

I appreciate that.

 

[Bigmike7645]

You are the man! Thanks!

 

[SIstomper]

Guy's make sure you use the 1n4148 or 1n4448 diodes. They are a high speed switching diode. And go no more than a 100 ohm on the resistor to ground. You can get away with not grounding the signal but it does make a good filter.

 

[djfourmoney]

Guy's make sure you use the 1n4148 or 1n4448 diodes. They are a high speed switching diodes. And go no more than a 100 ohm on the resistor to ground. You can get away with not grounding the signal but it does make a good filter.

I am going to assume to use both diodes inline with the signal wire to the device from the coils?

 

[SIstomper]

I am going to assume to use both diodes inline with the signal wire to the device from the coils?

You pull a wire from each coil. Each wire has a single diode on the end with the line (cathode or negative) facing away from the coil. You put all four diode ends together and run a wire from them to the device.

 

[Stasiu]

Well this was good timing, saves me a few bucks on not having to buy the tach adapter for the split second! Thanks!! What capacity would the 100 ohm resistor need?


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[SIstomper]

Well this was good timing, saves me a few bucks on not having to buy the tach adapter for the split second! Thanks!! What capacity would the 100 ohm resistor need?


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1/4 watt. Yes this works great with the SS. I had the adapter and it doesn't work very well.

 

[BlackT5]

If you really want to get fancy I can supply all the part numbers to create adaptors to go between the harness and coil packs. Then no cutting into your harness.

I did this in my aux fuel install and it came out great, SI can comment in that.

Some companies selling aux kits charge $125 for plug and play adaptors when you can build them for $25 in parts.

 

[SIstomper]

If you really want to get fancy I can supply all the part numbers to create adaptors to go between the harness and coil packs. Then no cutting into your harness.

I did this in my aux fuel install and it came out great, SI can comment in that.

Some companies selling aux kits charge $125 for plug and play adaptors when you can build them for $25 in parts.

I was just gonna hit you up about that. Maybe you should make them for sale. Get a little cash for that motor build :wink:

 

[Stasiu]

Im interested in finding out what adapters to use. Would make it easier to remove when im done with it


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[Bigmike7645]

You are the man! Thanks!

If you really want to get fancy I can supply all the part numbers to create adaptors to go between the harness and coil packs. Then no cutting into your harness.

I did this in my aux fuel install and it came out great, SI can comment in that.

Some companies selling aux kits charge $125 for plug and play adaptors when you can build them for $25 in parts.

This! I'd be interested in making a pnp setup as well!

 

[2.3FoST_victor]

Since our car has no physical tach wire the only way to get a proper signal is tap the coils. Aux controllers use the same method built in so this is more for the guys that have nitrous and meth controllers or need a tach signal for external knock sensor setups. Excuse the hand drawing. @Bigmike7645 @BlackT5 @djfourmoney @DDT1972


View attachment 210201

what would happen without the 100 omh resistor ?