Quick question here: I have a 1992 300D 2.5 with the pressure wastegate mod. Drives like a dream. I finally got around to hooking up a boost gauge and it shows 14 psi boost at the maximum under hard acceleration. It goes up to 14 pretty quick and then just stays there, even though I still have some throttle left. Doesn't matter when I floor it, though, it stays right at 14, which is to be expected with a wastegate that comes set to dump to maintain 14 psi.
My question is whether this is a little too high, since in reading this and other posts, it seems that the ALDA and IP are only capable of supplying enough fuel for only about a 11-12 psi boost and that the rest of the boost may be doing nothing but add stress.
I have no smoke, so whatever fuel is being supplied is being burned. In the interest of durability, reliability, and who knows maybe a hair better economy, should I adjust the length of the wastegate actuator from 14 psi to reduce boost to around 12? Or am I good just staying at 14? The concern is additional boost that the IP cannot supply fuel to.
Love these cars, btw. I have about 300K wheel time on two W124 diesels (so far!). Just awesome cars, 28 mpg around town and 35 mpg on the highway
, and super easy to work on.