knock retard

[wayne johnson]

Guys,
 Can some of you help? I have just begun to log data with Diacom on a 89
TPI vette and I'm seeing around 15 deg. retard at approx. 3500 RPM. 
Timing is set at 6 deg. BTDC and Chevron 93 octane gas is used. This
seems like a lot of retard?? 
The car does have dual pipes w/o cats, ADS off road prom, 160 deg.
thermostat, opened air filter lid, K&N filter, TPIS airfoil and TPIS MAF
sensor.
 If anyone is interested in having a look I can send the diacom file. Any
tips or things to look out for would be appreciated.

Wayne Johnson

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