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Jeremy5848 · #**356** 08-11-2007, 12:27 AM

Quote:

Originally Posted by deanot442

Jeremy
After reading the last few pages I had a couple of thoughts. I have seen similar issues when the problem was a partially clogged exhaust. To diagnose this we disconnected the flex-pipe just after the turbo outlet and took a test drive. The power dramatically improved, and the search began for the clog. The other thought was regarding the B100. Is the B100 home made or commercial? It could be a filter (even though its new, also both need to be replaced). When was the last time you ran a tank of D100? You could try to change the diet again and do a test to see where your results fall. I run b100 that i get from my brother-in-law's "still" and I notice a slight power decrease but nothing like what you are describing. The only other thing I can think of is that your waste gate is open or not sealing all the way and not allowing full boost pressure to the manifold.

Good ideas. The entire exhaust system and the turbo were replaced this soring as part of the trap ox recall (PO never got around to it). The performance (as I remember) was poor before the recall and poor afterwards. The dealer's wrench noted on the repair sheet that the car was a slug, by the way, so they saw it at the time they did the work.

The B100 is commercial, made somewhere in the midwest and shipped in by rail. Our '85 uses the same stuff and, as it gets out of town occasionally, also uses D100 and in-between mixtures. Since I don't see a significant difference in performance or economy with the W123 car and its 617 engine, I doubt that there would be a real difference in the later model and its 603. Nonetheless, I'll keep it in mind.

The primary filter appears to be clean but again, I certainly could change both of them. However, that would suggest that the performance was OK and got bad as the filter clogged. That is not the case, it has never been good, I just didn't know it until I had the chance to drive another 603.