From: Jim Bailey [jim@928intl.com]
Sent: Monday, March 25, 2002 12:50 PM
To: 928
Subject: [928] Re: power steering

the smaller wheel does take more effort to turn . Porsche did increase the
operating pressure of the power steering system for 1991 and later with a
new pump Vickers and runs 100 bar (about 1,400 lbs )up from the 75 bar
previously used .."steering forces are reduced in driving ".

Jim Bailey
928 International
Jim@928intl.com
www.928intl.com
(714)632-9288




From: griffs@griffiths.com [mailto:griffs@griffiths.com]
Sent: Tuesday, March 26, 2002 7:10 AM
To: 928
Subject: [928] NEW Product - High Output Power Steering Pump

Griffiths now offers a higher output power steering pump
for 78+ sharks.  Our "HO" pump makes parking and slow
turns easier.  The HO utilizes the OEM pump body
and shaft, just bolt her on and go.  In stock and
sold with core exchange, 2 year warranty.

Regards,
Griff
http://www.griffiths.com
1-800-451-7225




From: griffs@griffiths.com [mailto:griffs@griffiths.com]
Sent: Friday, April 12, 2002 8:40 AM
To: 928
Subject: [928] POWER STEERING


We have seen a few posts regarding power assist
on the 928.  Some of the information below may
be of assistance.

STEERING RATIO:
All 928's have the same steering
ratio.  Though there are minor configuration
differences between 1978-1981, all the racks are the same ratio.

DIFFICULT STEERING:
1. Naturally the first item to check is tire pressure.
You would be suprised how often we forget or take
tire pressures for granted.  AND, never "assume" the gauge
you are using is accurate.  Compare your tire gauge
to a few others (read the recent Consumer's Mag on tire
gauges).
2. Next step is steering geometry - alignment.
3. Remember a greater tire foot print on the road will
cause some effort in slow turns and parking.
4. Lastly, if the car has high mileage, you will want
to inspect "all" steering and suspension joints.
5. During the years we have remanufactured many power
steering pumps and racks.  Check below further below
for information.

TIE RODS:
Over the years I have owned 78, 84 and 89 sharks.
I'm amazed by the amount of stress on the inner tie
rod joint . In most cases the joint wear is not noticeable
with the suspension loaded.  If you are R&R'ing a rack
you might as well replace both the inner and out tie rod
joints.

GRIFFITHS HIGH OUTPUT PUMPS:
The original pumps from 1978-1990 are "rated" at 75 bars
or 1088 psi (1 bar = 14.5 psi nominal).  Pumps from 1991
onward are 100 bars or 1450 nominal psi.  Griffiths offers
customized high output pressure pumps for all year 928's.
Our high output pump helps reduce strain in slow turns,
parking situations and return lag times.

STEERING RACKS:
Racks with "internal leakage", meaning pressure is bypassing
the circuit or shaft piston, will result in heavy steering.
This condition is typical with: (i) racks with ring grooves present
in the pinion body, (ii) worn shaft pistons, or (iii) oversized
or worn cylinder tubes.  All Griffiths remanufactured power steering
racks are screened for ring grooves, have new high pressure spool valve 
seals and pistons which eliminate internal leakage.  Our racks are
hydraulically bench tested for: 110 bar peak and torque input to output.


Regards,
Griff
http://www.griffiths.com
feel free to contact us with questions or comments
9-5 EST tee times permitting
1-800-451-7225