I'd like to know about peoples experiences with knock/ping/detonation, mods, and octane with redblocks.
I read some people have no problems running 87 octane but I seem to not be able to as mine wants to rattle to pieces. I can hear heavy knock from in the cabin over my exhaust at high load and wide open throttle with low octane fuel. I also have a det-can setup using a knock sensor bolted to the engine wired to a cheap headphone amplifier with a pair of ear buds, so I can hear the light ping as well. Here's a pic of it. The knock sensor plugs into the black port, the "3D sound" usb dongle is to record what I hear in the headphones on my laptop.
I am running a stock ignition ezk mapping, and mostly stock LH fuel, just lowered the open loop threshold to target 0.88 lambda / 13 afr across the board at high load and wot in an attempt to reduce the ping, which did seem to help a bit vs running it at stoic. I have also verified that the ezk does in fact pull timing when I hear this ping, most of the time. It goes ham pulling timing with 87 in the tank. Here is the target ignition map for reference, it doesn't seem agressive.
If I pull a ton of timing from the bottom ~3 rows the pinging will stop with 87 octane. It needs quite a bit removed:
I recorded a 4 minute clip of the last miles of my commute home last night through the det cans. I was running a half tank of 93 octane and half 87 octane. So somewhere around 90 octane? I would think that would be enough for my stockish setup. You can hear ping at timestamps 0:06 0:24 0:44 1:00 1:10 1:24 1:36 1:47 2:04 2:23 2:51. I let off the throttle when I heard it, but if I held it in it will rattle consistently until the ezk pulls it. You can also hear the power steering pump at 3:01 3:19 and 3:25, some reverse gear crunch at 3:07, reverse gear whine at 3:10. The main tappy noise you hear throughout is directly proportional to engine rpm.
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My engine setup is mostly stock. Stock head, head gasket, stock manifolds, but with LH3.1, wasted spark, a B cam, and 2.25" headerpipe to a race cat to 2.5" catback.
Can any of you run 87 in your redblock?
I read some people have no problems running 87 octane but I seem to not be able to as mine wants to rattle to pieces. I can hear heavy knock from in the cabin over my exhaust at high load and wide open throttle with low octane fuel. I also have a det-can setup using a knock sensor bolted to the engine wired to a cheap headphone amplifier with a pair of ear buds, so I can hear the light ping as well. Here's a pic of it. The knock sensor plugs into the black port, the "3D sound" usb dongle is to record what I hear in the headphones on my laptop.
I am running a stock ignition ezk mapping, and mostly stock LH fuel, just lowered the open loop threshold to target 0.88 lambda / 13 afr across the board at high load and wot in an attempt to reduce the ping, which did seem to help a bit vs running it at stoic. I have also verified that the ezk does in fact pull timing when I hear this ping, most of the time. It goes ham pulling timing with 87 in the tank. Here is the target ignition map for reference, it doesn't seem agressive.
If I pull a ton of timing from the bottom ~3 rows the pinging will stop with 87 octane. It needs quite a bit removed:
I recorded a 4 minute clip of the last miles of my commute home last night through the det cans. I was running a half tank of 93 octane and half 87 octane. So somewhere around 90 octane? I would think that would be enough for my stockish setup. You can hear ping at timestamps 0:06 0:24 0:44 1:00 1:10 1:24 1:36 1:47 2:04 2:23 2:51. I let off the throttle when I heard it, but if I held it in it will rattle consistently until the ezk pulls it. You can also hear the power steering pump at 3:01 3:19 and 3:25, some reverse gear crunch at 3:07, reverse gear whine at 3:10. The main tappy noise you hear throughout is directly proportional to engine rpm.
<audio controls>
<source src="https://esmth.com/f/220311/n16.mp3" type="audio/mpeg">
Your browser does not support the audio element.
</audio>
My engine setup is mostly stock. Stock head, head gasket, stock manifolds, but with LH3.1, wasted spark, a B cam, and 2.25" headerpipe to a race cat to 2.5" catback.
Can any of you run 87 in your redblock?
