Lurker is still dumb, needs help with tune/reading plugs
#1
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OK guys, any help with this is really appreciated.I'm not making the power I should be, and I'm clearly messing this up on my own, so I'm looking for a bit of guidance here before I blow this poor thing up.
I have a '93 with a 1.6 with the below engine mods:
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This looked way too low for the mods I have. I know it's just a virtual dyno, but I've read they're fairly accurate and I figured it was worth doing a health check.
I ran a compression test and got ~180/180/180/190 hot
Here are the plugs starting with the closest to the firewall (#4)
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Please correct me if I'm wrong, but this looks like I have some pretty bad detonation. Otherwise it looks like the heat range is OK (maybe a bit cold?) and the deposits besides the det look acceptable.
Am I just running way too much spark? (I guess so from the det, but it feels sluggish otherwise)
Are my cams maybe set completely wrong?
Are my WOT AFRs too rich? (I think perhaps)
.msq and .msl are attached. Here are screenshots of fuel/spark.
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I have a '93 with a 1.6 with the below engine mods:
- Head shaved to ~10:5:1 compression
- 264° I+E cams @ 9mm lift with SUBs and adjustable gears
- DIY light smoothing/port job
- ITBs off of a AE86 using the T3 adapter
- Bosch EV14 330cc injectors
- Toyota COPs
- Coolant reroute
![Name: tKCzAWq.png
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Size: 214.2 KB](https://www.miataturbo.net/attachments/megasquirt-18/230027d1683052171-lurker-still-dumb-needs-help-tune-reading-plugs-tkczawq.png)
This looked way too low for the mods I have. I know it's just a virtual dyno, but I've read they're fairly accurate and I figured it was worth doing a health check.
I ran a compression test and got ~180/180/180/190 hot
Here are the plugs starting with the closest to the firewall (#4)
![Name: U3wdbGN.jpg
Views: 31
Size: 168.7 KB](https://www.miataturbo.net/attachments/megasquirt-18/230028d1683052171-lurker-still-dumb-needs-help-tune-reading-plugs-u3wdbgn.jpg)
![Name: C2pwTVa.jpg
Views: 29
Size: 157.3 KB](https://www.miataturbo.net/attachments/megasquirt-18/230029d1683052171-lurker-still-dumb-needs-help-tune-reading-plugs-c2pwtva.jpg)
![Name: n4xmWk5.jpg
Views: 30
Size: 189.3 KB](https://www.miataturbo.net/attachments/megasquirt-18/230030d1683052171-lurker-still-dumb-needs-help-tune-reading-plugs-n4xmwk5.jpg)
![Name: 44qcVgK.jpg
Views: 30
Size: 150.1 KB](https://www.miataturbo.net/attachments/megasquirt-18/230031d1683052171-lurker-still-dumb-needs-help-tune-reading-plugs-44qcvgk.jpg)
Please correct me if I'm wrong, but this looks like I have some pretty bad detonation. Otherwise it looks like the heat range is OK (maybe a bit cold?) and the deposits besides the det look acceptable.
Am I just running way too much spark? (I guess so from the det, but it feels sluggish otherwise)
Are my cams maybe set completely wrong?
Are my WOT AFRs too rich? (I think perhaps)
.msq and .msl are attached. Here are screenshots of fuel/spark.
![Name: KYYkM6I.png
Views: 31
Size: 85.5 KB](https://www.miataturbo.net/attachments/megasquirt-18/230032d1683052171-lurker-still-dumb-needs-help-tune-reading-plugs-kyykm6i.png)
![Name: 2W06mWv.png
Views: 28
Size: 88.4 KB](https://www.miataturbo.net/attachments/megasquirt-18/230033d1683052171-lurker-still-dumb-needs-help-tune-reading-plugs-2w06mwv.png)
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#2
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Plugs are hammered with detonation, really bad. Way too much timing. You need to check your base timing, my guess is if you lock the timing to 10* in TunerStudio, then check it with a timing light, it's at more than 10*. Probably like 15* or more. Fix that, and then put a safe timing map on the car. And new plugs, and go from there.
#3
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Plugs are hammered with detonation, really bad. Way too much timing. You need to check your base timing, my guess is if you lock the timing to 10* in TunerStudio, then check it with a timing light, it's at more than 10*. Probably like 15* or more. Fix that, and then put a safe timing map on the car. And new plugs, and go from there.
#4
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Late update on this. I installed new plugs and dialed back spark even more, no det heard or seen on plugs.I worked my way back up to the original timing map over time, checking plugs/listening and I'm not seeing any more det.
I got a couple of pulls on a dyno the other day and actually picked up almost 10% WHP at the 7800 RPM with more spark (still no det). Car read 140whp/110wtq corrected for altitude (I'm at 4,200ft).
I have no idea what happened, but apparently the det is gone...
I got a couple of pulls on a dyno the other day and actually picked up almost 10% WHP at the 7800 RPM with more spark (still no det). Car read 140whp/110wtq corrected for altitude (I'm at 4,200ft).
I have no idea what happened, but apparently the det is gone...
#7
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Fuel pump suction sock has given me intermittent det issues before, def don't buy a non-oem sock, they are garbage and you'll be replacing it again shortly when it collapses and plugs off.