Hurley88E9 Posted January 21, 2019 Share Posted January 21, 2019 My 1988 Superliner with an E9 and V style pump does not seem to run like it has the advertised 500Hp. I just put new injection nozzles in it a few months ago. It does not smoke at all under any circumstances other than when the parking brake is set and you floor the accelerator pedal. I have never seen EGTs get much over 900 on a heavy pull. There also does not seem to be a lot of whistle from the turbo when its under a heavy load like it could stand to have more fuel. Today I pulled the puff limiter out. The PLE dimension stamped on the pump housing is 1.086. The set PLE dimension Measured 1.010. I would think that being that much shorter would allow the rack to travel fully. I decided to throw a .020 shim in it just to see what would happen so my current PLE is .990 and its supposed to be 1.086. Also I removed the air line that supplies the puff limiter. With the truck aired up and the parking brake released air comes out of the reversing valve. My reversing valve is mounted on the manifold and has one air line that supplies air to the valve, one port connected to the manifold and then the port that supplies air to the puff limiter. I removed the valve from the manifold and connected a pressure tester to the port that connects to the manifold. I also inserted a test fitting in the port that goes to the puff limiter. When the manifold pressure was set at 15 psi the valve supplied 15 psi to the puff limiter. When manifold pressure was increased to 20 psi, 8 psi was supplied to puff limiter. When manifold pressure was increased to 25 psi, 4 psi was supplied to the puff limiter. Puff limiter would fully extend when 20-25 psi was applied. Does all this data sound correct? My concern is the reversing valve is allowing to much pressure to go to the puff limiter causing the fuel rack to not go full throttle. I have not checked boost pressure but i did install a test fitting so the next time its driven i will record boost pressure. I dont think there are any leaks in the intake due to the fact i have no smoke. Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.