View Single Post
  #4  
Old 08-04-2006, 02:45 PM
Brian Carlton Brian Carlton is offline
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
No valve adjustment required on the 603.......you can toss out those feeler gauges.

Your problem is not the boost. It's the shift points.. This engine should upshift at above 4500 rpm. You can't get the full boost or anywhere near full performance at 3000 rpm. Some of these fellows run the engine to the north side of 5000 rpm for maximum power.

So, instead of screwing with the valves this weekend, you need to make an adjustment to the Bowden cable. This is the cable that provides throttle pressure to the transmission and delays the upshift. The cable needs to be tightened slightly. There is a plastic adjustment ferrule at the mounting point for the cable underneath the hood on the passenger side. The ferrule gets pushed out of the bracket..........rotated for adjustment........and reinserted in the bracket. You are looking to shorten the cable. I'd probably turn the adjusting nut at least 3-4 turns to get the shift points up near 4700 rpm.

Then, take it out for a drive with the boost gauge connected and repeat the test for boost at maximum power above 4000 rpm. You should be above 10 psi..........12 psi would be even better.
Reply With Quote