How much timing retard is too much?

[Dave]

I just hooked up a Matco scan tool to my car and did some quick recording during some runs. Cylinder 2 and 3 seem to retard around 2* of timing each run. The knock voltage rarely exceeds .8 volts. How much is too much?

[Speedeuphoria]

how much psi and what cal?

[Dave]

Mopar performance PCM. I'm at 15psi on the stock intercooler with a T03 Garrett.

[risen]

I just hooked up a Matco scan tool to my car and did some quick recording during some runs. Cylinder 2 and 3 seem to retard around 2* of timing each run. The knock voltage rarely exceeds .8 volts. How much is too much?

From looking @ the knock curve in the 87 cal, anything above 3300 rpm with < .8 volts on the sensor is not considered knock. I believe there's also a minimum rpm to even look at the knock sensor (I believe it's around 1500 rpm). I'd highly recommend grabbing a copy of dcal and some of the factory cals and looking at the DLTKNCK table.

[Dave]

From looking @ the knock curve in the 87 cal, anything above 3300 rpm with < .8 volts on the sensor is not considered knock. I believe there's also a minimum rpm to even look at the knock sensor (I believe it's around 1500 rpm). I'd highly recommend grabbing a copy of dcal and some of the factory cals and looking at the DLTKNCK table.

Good advice, thank you.