by muzak » Thu Jul 23, 2009 5:54 pm
Let's dub the 4D56 water cooled turbo the 'Spencer turbo' to honor the guy who hustled to help guys like me get 1 which is sweet BTW. He said there's a way to just swap the cartridge on the TD04-09 that were stock in the 84-85's. But I have the 83 and even w/out the 4D56 head it does hum, running with only about 10K on the motor and it's first fill with synthetic oil. Clearly the original valve train and larger injectors with the 83 head was good and they perform well with the flat tap, sometimes the olds gold. especially vs. the shortage of raw materials for making these new 4D56 heads. Kind of like Lister generators, not many good left.
In terms of boost I see the most 10psi climbing my mountain 18% grade road for about .5 mile home. But when I got stopped by the chps I had been stretching out 5th to see what I could get, it will hit 9psi but clearly not until about 65mph and that is a bit too fast up here with all the increased patrol activity. have to get it down to the Bay Area and roll with the cousins of the fukin lunatics on I5 in socal where motorcycles get rammed into the side of D50's.