hey, ive done a search but havent found anything...

however i read ina Hot Rod mag that you can run a 100ohm resistor witth a switch in the dash or consolefrom the sensor to the ecm and for running at the track you can switch it on and off??? does this work? is it really necesary because i've heard that the computer retards the timing in accordance with this sensor?? has anyone done this or have a wiring diagram on how to do it??

 

I'd bet they were talking about the Coolant Temperature Sensor, not the knock sensor.

Putting the resistor in series would fool the computer into seeing a cooler engine and providing a richer mixture and more spark advance.

The knock sensor generates voltage under engine knock, there's nothing to gain modifying this circuit. If the engine is knocking you definitely want the engine to retard the spark.

 

yeah they were talking about the knock sensor... heres what the blurd says:

"The knock sensor retards timing by varying signals from the ECM. For a brief period after the 1-2 shift, a GM ECM will retard timing as much as 10*, hurting the vehicles ET.
The solution to this problem at the track is running a 100ohm resistor from the knock sensor to a switch on the console and back to the ECM" HOTROD (april 2000)

and it goes on to suggest race gas to prevent deetonation

 

It's doable. All the resistor does is fool the ecm into thinking the sensor is in, doing this should not be any problem. If you use the high octane stuff it should not harm anything at all. I would be suspect of the mag article, as was said the KS only retards timing when it senses vibration in the 6-8hz area to retard the timing. Shifting should not bring about that problem, but who knows.

 

yeah it never occured to me that the KS would make such a difference i guess i'll have to try it and see if i gain any better 1/4mile times

thanks for the replies