Turbo Project Problems

[Alexander van Gerbig]

    I went for a decently longer drive than before, let's say I went 20
miles this time.  The first thing that caught my nose was the burning
coolant, man that stuff stinks to high hell when it burns off on a hot metal
object, namely my cylinderhead.  Then I noticed that oil pressure is still
lower than I'd like:

Idle (0.8k) = 0.5bar to just below 1bar, the hotter the lower
2k rpm = 2bar
3k rpm = 3.5bar
4k + rpm = 5bar

That low pressure at idle scares me and I still haven't had the oil cooler
thermostat allow oil into the cooler, even after 15 minutes of sitting to
get the fans to kick in for the cooling system, which they finally did.  Oil
temp gauge read around 90-100C at the hottest idle, oil pressure was 0.5bar,
too low for me.  I am thinking maybe I should get rid of the coffee can
filter and go back to the regular filters and some higher weight oil, sound
like a good idea?

I do have boost alright, feels wicked even at lower boost levels, much
faster car.  I ran at 0.43bar (~6psi) and my air/fuel read one bar above
stoich, which pleased me.  Though other times I pushed it to .40bar and the
gauge dips to full lean and then hops up to stoich and rich again after a
second.  I am thinking that on the onset of boost the mixture is leaning out
and when the ECU finds out it's hitting the DPR with more current to richen
things up, anyone?  Dangerous?

When I hit full throttle, no matter what, the air/fuel gauge drops to full
lean and doesn't hop back up until I let go.  The WOT switch is the same one
that was in the car before the conversion and I know it works.  I can hit
full boost slowly and everything is fine, but if I try to jump on it a bit
it goes lean.

I will have to get a new seal for that leaky flange at the rear of the
cylinderhead.  I'm not loosing that much coolant at all but it is real
smelly and sometimes there is a tiny bit of smoke from it.  I can't find any
secret oil leaks that would be causing low pressure, but I want to get it
higher for sure.  I am going to fiddle with the base mixture and timing to
get the idle a tiny bit higher so the oil pressure is higher as well, plus
when I slow down to idle the engine wants to drop to 0.5k rpm and then kick
back to regular idle.

Thanks and soon she'll be ready!

Alexander van Gerbig -- '88 80

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