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Old 09-24-2016, 01:57 PM   #1
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Default Why am I knocking?

Had my car tuned by Jei @ Blacktrax performance in Milpitas, CA.

Car is:
1.6 L
Greddy TD04-15G
3" Exhaust
440cc injectors
55mm CX Radiator
Toyota Coil Packs
GM Mass Pressure Sensor

We ended up backing out of boost at 197 whp and a little under 10 psi. Beyond these levels the car started knocking even under extremely rich conditions, and with pulling timing (we since reset the settings to more reasonable levels at 10psi). Thinking its a weak ignition system parts causing the issues, but trying to diagnose. Any ideas where to look first?
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Old 09-24-2016, 02:07 PM   #2
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What intercooler? Its on california gas so low knock thresholds are common. But 10psi is a little low. What timing are you running at 10psi.
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Old 09-24-2016, 03:53 PM   #3
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Its a 24" x 12" x 3" eBay intercooler. IAT's were low on the dyno.

I'll pull the tune file to get timing #'s don't remember off the top of my head.

- Chris
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Old 09-26-2016, 12:50 AM   #4
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By Toyota coil packs, do you mean the Toyota COP's? Are you running them sequential or wired for wasted spark? And yes, the timing table helps!
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Old 09-29-2016, 12:53 AM   #5
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Bad gas? Chance you have 87 in it? I would drain the tank and try again with fresh gas.

How confident are you with your base timing?

Last edited by farpolemiddle; 09-29-2016 at 12:59 AM. Reason: Timing ?
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