[Vwdiesel] 1990 Turbo diesel Fox 2 dr Wagon

[Brian and Ruth Decker]

Hi James; 
	I have my EGT probe mounted about 1 inch behind the exhaust turbine
blades. I have been somewhat conservative and rarely hit 1100. I can keep my
foot in the pump and get up to speed or climb most hills on the freeway
around here using 1100 as a red line. I will research the turbo scene for a
turbo that will give me more boost. I do have a couple of used turbos from
Audi 5000 gas engines to check on. The twin Turbo Cummings in the big diesel
trucks I drive in the summer time will pull 40 to 45 psi when climbing the
passes.
Brian Decker
	

-----Original Message-----
From: James Hansen [mailto:jhsg at sasktel.net] 
Sent: Wednesday, April 18, 2012 7:45 AM
To: 'Brian and Ruth Decker'; vwdiesel at vwfans.com
Running more advance is dynamically similar to having more static
compression- it effects combustion chamber pressure at TDC, which is pretty
much all of it- square inches and how much pressure on that area equates to
torque. The consequential longer burn time may give a marginal increase in
efficiency as well, as you get to use more heat in the combustion chamber to
push on the piston, rather than releasing it to the exhaust stream. How
manufacturers balanced off the lower compression ratio is by running higher
boost numbers, 30-40 psi boost in Cummins for instance... I suspect if you
ran more boost, you would have a happier engine with less timing, and vice
versa. 

When you say recommended pump setting, are you going off pump numbers? You
stated the engine wanted the cold start out, maybe the pump is one that need
more advance right from factory?

Have fun with it Brian. as long as you have egt post turbo of less than
1250, you're good.  Find yourself a big long hill so you can WOT load it and
keep it there for a while, just to be sure.
-james