Why am I knocking?
#1
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
FMIC
55mm CX Radiator
Toyota Coil Packs
GM Mass Pressure Sensor
MS PNP2
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?
Car is:
1.6 L
Greddy TD04-15G
3" Exhaust
440cc injectors
FMIC
55mm CX Radiator
Toyota Coil Packs
GM Mass Pressure Sensor
MS PNP2
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?
#8
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Join Date: Sep 2011
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Your timing looks reasonable. CA 91 Octane sucks. Maybe your engine has other issues.
And please don't be offended, but the IATs you claim were low- were they measured before or after the turbo?
And please don't be offended, but the IATs you claim were low- were they measured before or after the turbo?
#10
Jei is a pretty well-respected tuner in the bay area, so I would expect he's giving IATs after the intercooler.
Did he datalog the dyno tuning runs on the MS? If so, do you have those logs? That would answer the IAT question quantitatively.
Some motors are just more ping-prone than others. I've heard of people using seafoam to clean out deposits that can contribute to detonation, might be worth a try. Also, how much oil is getting into the intake? If it's a lot (say, if the motor has a lot of blow-by and you don't have a good catch-can setup) then that can cause pinging -- oil has a very low octane.
--Ian
Did he datalog the dyno tuning runs on the MS? If so, do you have those logs? That would answer the IAT question quantitatively.
Some motors are just more ping-prone than others. I've heard of people using seafoam to clean out deposits that can contribute to detonation, might be worth a try. Also, how much oil is getting into the intake? If it's a lot (say, if the motor has a lot of blow-by and you don't have a good catch-can setup) then that can cause pinging -- oil has a very low octane.
--Ian
#11
Jei is a pretty well-respected tuner in the bay area, so I would expect he's giving IATs after the intercooler.
Did he datalog the dyno tuning runs on the MS? If so, do you have those logs? That would answer the IAT question quantitatively.
Some motors are just more ping-prone than others. I've heard of people using seafoam to clean out deposits that can contribute to detonation, might be worth a try. Also, how much oil is getting into the intake? If it's a lot (say, if the motor has a lot of blow-by and you don't have a good catch-can setup) then that can cause pinging -- oil has a very low octane.
--Ian
Did he datalog the dyno tuning runs on the MS? If so, do you have those logs? That would answer the IAT question quantitatively.
Some motors are just more ping-prone than others. I've heard of people using seafoam to clean out deposits that can contribute to detonation, might be worth a try. Also, how much oil is getting into the intake? If it's a lot (say, if the motor has a lot of blow-by and you don't have a good catch-can setup) then that can cause pinging -- oil has a very low octane.
--Ian
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