Hi Nick, It's highly unlikely the turbo wastegate needs adjustment. More likely is the ALDA needs a slight tweak. Your numbers are pretty close to spec, you should be approx 13 seconds to 60mph near sea level assuming your speedo is accurate (check with GPS) and you are using a stopwatch for timing. If you put a boost gauge on the car, put a "T" in the line to the ALDA, spec is 12-14psi at 4000rpm at full throttle under load. Most OM603's are set around 12psi, in my experience. A half-turn CCW of the ALDA screw might be enough to help things out, maybe a full turn if you don't get excess smoke leaving a stop.
The odd part is the car is slower with the AC on. There is a WOT cutout switch on the throttle linkage that is supposed to turn of the AC compressor at full throttle. Perhaps your throttle linkage is not adjusted properly, or the switch is faulty, or a wire is broken. With the AC on, you should be able to push the switch with your finger and observe the compressor turn off while the switch is engaged. Here's a photo of the switch: http://www.w124performance.com/images/OM603_misc/microswitch.jpg Not sure about the AC engagement issue, could be one of a number of things - not sure where to start. I'm not a W126 expert so I'll let someone else pipe up on that topic. :-) HTH, Dave M. Boise, ID > ------------------------------ > Date: Mon, 1 Aug 2005 08:39:48 -0700 (PDT) > From: Nick Gough <[EMAIL PROTECTED]> > Subject: [MBZ] Turbo adjustment on a 300SDL, A/C & search for parts > To: [EMAIL PROTECTED] > > > In my early efforts to sell the 86 300SDL (I've postponed that one a year or > so... finances), someone mentioned after driving it, that the turbo was weak > and it needed to be adjusted. He suggested that it was a valve of some sort. > I've always thought that the only adjustment on any turbo was the wastegate. > The car does fine with the A/C off, in the 0-60mph run (about 14 secs) and > about > 16-18 secs with the A/C on. > > A/C is another story... most of the time it is great, but sometimes it just > doesn't > kick in... like a switch or fuse is keeping the compressor from kicking in. > > Anyone with advice? > > > Regards, > > > > Nick Gough > > 86 300SDL 168k miles
