[kplackmeyer]

Hello to all.

I am new to the Forum, but not new to CIS. I recently picked up a 1975 911s from a former employer (mechanic and shop owner). I have known the car for over 20 years, and it has primarily been a "go fast" car, not an every day driver...but was driven regularly.

I am in the process of running the obligitory checks, but wanted to post my issue to see if anyone else has seen this one.

The car starts, runs and drives (at normal traffic driving) with no problems. However, above 4800 RPMs, it begins to fall on it's face (loses power, stumbles, won't accel, pops, etc).

Now here is the fun part...go hard around a left or right corner... BAM! head pressed to the back of the seat and away she goes, all the way up to redline. Straigten out...stumbles like a drunk on a Saturday nite.

Motor has about 10k on it, it's the 2.7 from 1975 but when redone all of the fixes were done (case helpers, racing studs, delete of thermal reactors, 11 blade fan, carrera oil cooler).

So far, System pressure and warm control pressure are ok, but I have the vacuum controlled pressure regulator, so I am picking up a Vacuum pump/gauge in the morning.

Need to check the fuel pump delivery rate at the return line...didn't have the appropriate hose to do it safely tonite. I checked it at the supply line, just for a base-line comparison, and it was good...but it's gotta be checked at the return.

Plunger and air flow sensor are both free...no binding. New fuel filter, holds pressure after shutoff, so accumulator seems ok.

Checked for vacuum leaks more times than I care to count. Can't find any.

My current thoughts are either a bum fuel pump not delivering enough volume, but under hard cornering it tightens up any play inside (I believe they are roller-style pumps?) or, the vacuum actuation of the Control Pressure regulator is bad at high load/high rpms...but I have NO good explination for the symptom going away in hard corners for that one.

Updates coming soon...but I wanted to throw it out there for comment.

Oh...and since this is my first post...I wanted to say thank you to everyone for all of the great info on this forum. It's amazing just how much great stuff there is.