PeachParts Mercedes-Benz Forum - View Single Post - Blistering 24 sec. 0-60mph in a 124

2.5Turbo · #3 03-27-2007, 12:58 PM

If you're getting those times on one of those 87's in your sig, then something is definitely wrong. The 603 in the '87 doesn't use a vacuum controlled wastegate like the 602 in the 90-93 300D, it has the old pressure activated one. First off, check fuel and air filters. Second, be sure that your ALDA lines are clear and the overboost valve and switch are functioning properly. To test, just temporarily run a line from the manifold fitting to the ALDA directly. If that doesn't help, check the tank strainer, mine was pretty gunked after 100k. You also might want to check out the timing chain stretch since that can hurt your performance if it's really bad. Past that, unfortunately you're going to have to dig into the turbo or IP.

To test your boost, you're going to need a boost gauge, not a mityvac. Put a Y connector between the manifold and the ALDA and run a line to the boost gauge from the Y. You should be getting 12-14psi at full boost with the ALDA functioning.

My 602-powered '90 gets about an 18-19 second 0-60 when there's no boost.