Why am I knocking? MS2E
#1
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This is my first car to tackle the tuning on my own. I've done tons of reading and research on here and other sites, bc I hate to clog up forums with useless stuff. But I've run into an issue that I can seem to figure out on my own.
I'm experiencing a semi random hard to pinpoint "knock" issue. For back story I've tried retarding the timing over 100kpa by as much as 4* and I still get knock retard for a short period. I'm going to attempt to attach my current .msq file, and a short log I took today on my way to work.
Important Info:
Car: 1999
ECU: Reverant MS2E
Engine: rebuilt 1.8, 1mm oversized intake valves, forged rods, ceramic coated oe pistons, arp head studs
Turbo: FMII GT2560, cast log manifold, intercooled
Injectors: RX8 Yellow
Octane: 93
Exhaust: 3" turbo outlet back, no cat
***I've only tuned up to 60-70% throttle input and ~8psi.***
I'm experiencing a semi random hard to pinpoint "knock" issue. For back story I've tried retarding the timing over 100kpa by as much as 4* and I still get knock retard for a short period. I'm going to attempt to attach my current .msq file, and a short log I took today on my way to work.
Important Info:
Car: 1999
ECU: Reverant MS2E
Engine: rebuilt 1.8, 1mm oversized intake valves, forged rods, ceramic coated oe pistons, arp head studs
Turbo: FMII GT2560, cast log manifold, intercooled
Injectors: RX8 Yellow
Octane: 93
Exhaust: 3" turbo outlet back, no cat
***I've only tuned up to 60-70% throttle input and ~8psi.***
#6
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Looks like I'll be making some det cans over the weekend. I don't see anything wrong with something like this? How to make and install a det can - HomemadeTurbo - DIY Turbo Forum
#7
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DIY electronic detonation detection/det cans for under 25 dollars - D-series.org
I made these, but they have a lot of interference. If I could do it over, I would make them with shielded wire.
I made these, but they have a lot of interference. If I could do it over, I would make them with shielded wire.
#8
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So I built and installed the DET Can that I linked to in my last post, and confirmed that I was actually knocking. So I took a closer look at my spark table and made some changes and was able to get rid of the knock. I'd like some input on where I started to where I am now. I'm running low boost right now so the problem area was between 128Kpa and 156kpa.
Picture Order:
1: Current Settings that fixed the knocking issue
2: Settings before fixing the knock
3: A table I found on the forum that I original started with a few months ago.
![](https://www.miataturbo.net/attachments/megasquirt-18/140828-why-am-i-knocking-ms2e-80-spark_no_knock_e1ee296b05912c33725ebf5892417fad287dba73.jpg?dateline=1433188148)
1-Spark table that fixed the knock
![](https://www.miataturbo.net/attachments/megasquirt-18/140829-why-am-i-knocking-ms2e-80-spark_knocking_b712d2fa17afa7df6b160537e5d4d292f79e03e7.jpg?dateline=1433188148)
2-Spark Table that was knocking
![](https://www.miataturbo.net/attachments/megasquirt-18/140830-why-am-i-knocking-ms2e-80-spark_original_b0dda74a4c828ef85ca40bf7b249af976b09fe29.jpg?dateline=1433188148)
3-Starting Spark Table that was also knocking.
Picture Order:
1: Current Settings that fixed the knocking issue
2: Settings before fixing the knock
3: A table I found on the forum that I original started with a few months ago.
![](https://www.miataturbo.net/attachments/megasquirt-18/140828-why-am-i-knocking-ms2e-80-spark_no_knock_e1ee296b05912c33725ebf5892417fad287dba73.jpg?dateline=1433188148)
1-Spark table that fixed the knock
![](https://www.miataturbo.net/attachments/megasquirt-18/140829-why-am-i-knocking-ms2e-80-spark_knocking_b712d2fa17afa7df6b160537e5d4d292f79e03e7.jpg?dateline=1433188148)
2-Spark Table that was knocking
![](https://www.miataturbo.net/attachments/megasquirt-18/140830-why-am-i-knocking-ms2e-80-spark_original_b0dda74a4c828ef85ca40bf7b249af976b09fe29.jpg?dateline=1433188148)
3-Starting Spark Table that was also knocking.
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