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Old 02-27-2014, 01:34 AM   #1
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Default JRSC spits black spooge at idle?

Hey guys,
So in installed a new (1992 70k miles) engine and trans with a supercharger attached into my 1991 over the past weekend. I also installed a header, trust exhaust and, eliminated the cat. I have a few questions though:

I notice that if I have the car sitting idling and warming up, that some black stuff will come out of the exhuast and onto the driveway / garage door! is this normal? I wondered if it was just condensation that got built up from heating / cooling.

The second is that in addition to the afpr the kit came with, I installed a bipes that I bought here on the forum, it seems to be working, but I took it on a drive and after a while all the lights went off. When I started my drive, only one was constantly lit. The others would illuminate as it pulled timing, and once I got on the highway and shifted to 5th, it went off. The lights would re-illuminate indicating it was pulling timing if I stepped on the gas again. Normal?

Thanks in advance.

PS I think the car is running pretty good, it has way more pep than I expected it to after reading about the jrsc. Can you audibly hear detonation? I have some hearing loss, and forgive me for asking, but I wonder if it sounds like it does on a dirtbike? like static or pebbles hitting the fender wells or?
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Old 02-27-2014, 01:49 AM   #2
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Hi Matt. I hope that bipes is working, but I'm not sure exactly how it should work. I do know that you should only pull timing when manifold pressure is high. With low manifold pressure (such as cruising on the highway in 5th), you would like to retain OEM timing to preserve torque.

Fuel is a hydrocarbon and the main products of combustion are CO2 and H2O. What you see during initial start/idling/warming is water from combustion mixed with soot. Completely normal. You would have less of this with a cat.

Really hard to hear det on a Miata engine unless it's really bad. If you have a 90-93 (or if you've retrofitted a real oil pressure gauge to a later car), watch the oil pressure needle. If there's det, it will jitter. That's a pretty good first sign.
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Old 02-27-2014, 02:32 AM   #3
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Thanks for the reply! The bipes seems to be working, I pulled the new 7 heat range plugs I got and the electrodes are white, the porcelain is like new, and the base of the threads are black. Should that warrant a bit of adjustment of the afpr? I have the timing set at 12 or so degrees with 7 degrees being pulled starting at 1500.
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Old 03-05-2014, 05:13 PM   #4
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The black stuff will be because you have taken out the cat, I have done the same and my car does it also. Not a lot you can do about it.
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Old 02-01-2015, 11:35 PM   #5
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I have the black stuff too except I have a cat! Curious...my cat is only 2 years old. Could I have blown it out already??
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