Originally posted by 2mAn
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Fortunately, the dyno might be part of the solution.
Basically I discovered that this subtle -coins in a tin can- type sound I am hearing when the engine is under high load is a mild ping. You'll hear the noise when you lug the engine or if you're just revving it out. Revving it out, you'll hear it for a second at low RPMs and then it will come back for a split second at mid/high-ish RPMs.
However, it'll barely ever ping under normal daily driving, which is good. It's also incredibly mild. I had to make the noise a few times for my mechanic to even hear it. I plan on taking the E30 to work tomorrow.
I have already tried putting in lower temp plugs: the NGK BPR6ES that digger recommended, but it did next to nothing. I think the best solution will be a new tune to back off timing a bit.
I called the dyno place and they do dyno pulls in the morning and are only open weekdays. I think I'll have to set it up and come in work late one of these mornings. Only issue is I'm not sure if should do my dyno pulls without an O2 sensor so I can have their wideband plugged in, or if I should put in a second bung in the exhaust to put their WB into (for AFR readings). Once I figure that out, I'll be setting the appointment.
In other news, I've finally got around to clear coating my Garagistic strut bar and have it installed. Looks nice. Steel = real.
As for you, if you have a healthy M20B25 I would run that, at least for a while. No need to tear it apart unless you are motivated to build a motor. The 5 speed is a much more important addition to your car than better HP or more torque, IMO. Like I said, this build was never for chasing numbers!
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