I reinstalled my boost control solenoid and started tuning the closed loop boost control again this week. It's kind of a pain, but it's almost there. I'm currently running around 10psi of boost, and am turning it up another pound tomorrow. Though I've added a degree of advance here and there in boost, this tune is going to stay conservative as long as I have a stock head gasket. I don't trust it. I am very happy with my exhaust though, the second muffler I added a while back is still worth the loss of ground clearance, the car is quieter with the M20 than it was with the M42, and has a nice deep sound with little of the awful rasp that is present in so many loud M20 cars. If you haven't heard a field of spec E30 cars I'd describe the sound as like a flock of civics which have been blessed with two extra cylinders each, or many, many bees.
Another decent shot of my engine bay. I'm going to do a valve adjustment and clean the aluminum up a bit in the next couple of weeks. I really want to get rid of the yellowing on the intake manifold, I like the look of clean cast aluminum.
In my particular case it just wouldn't fit (the arm should extend straight to the valve) so I had to cut the arm and put it there, it's far from ideal but it's working so far. The bracket is also for a T3, not a T4, so it is only held on by one bolt. Some turbos don't allow this kind of re-positioning, the actuators are bolted to the front of the housing or otherwise affixed to a spot other than the bolts holding the housing on. In the case of some holsets the actuator bolts to a bracket that is cast into the compressor housing, those are a pain to clock and use.
Another decent shot of my engine bay. I'm going to do a valve adjustment and clean the aluminum up a bit in the next couple of weeks. I really want to get rid of the yellowing on the intake manifold, I like the look of clean cast aluminum.
Originally posted by Northern
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