So - I haven't seen much discussion anywhere about the power-steering aspects of this swap. I'm looking at a potential solution, but was also wondering what others have come up with.
In our case, the car has an e36 M3 steering rack (quicker ratio), and the donor pump is the tandem-vane design from a 740i. Other than an additional 10mm pressure port, to support the ABS system (pressure accumulator), I don't see any functional difference between the 740i pump, and one out of a non ASC+T vehicle.
Ports are configured as follows:
1) Pump out to rack: 14mm x 1.5mm Banjo
2) Pump in from reservoir: 18mm Banjo
3) HP port on rack: 14mm
4) LP port on rack (to reservoir): 16mm
Incidentally, the port sizes on the e36 rack are the same as the stock M20-equipped e30.
It would be preferable, to *not* mount the reservoir in the stock location, since it will undoubtedly be exposed to significant radiant heat from the exhaust manifolds. As a result, it would be great to mount the stock reservoir, or a custom reservoir in a more "friendly" location.
The only "high" pressure line is the 14mm line from the output of the pump to the top port on the rack. Everything else will see either low pressure, or slight vacuum (input line to pump). These lines were simply clamped to the OEM reservoir, after all.
Parker makes adapter fittings, to convert the metric banjo port to an AN male. The 14mm becomes a -6AN, the 16mm becomes a -8AN, and the 18mm becomes a -10AN. We can use standard AN hardware and hose for the two low pressure lines, and have a single HP line made up with -6AN hose ends, in the lengths and orientations to make it clean and sensible.
What have others done?
-Bruce
In our case, the car has an e36 M3 steering rack (quicker ratio), and the donor pump is the tandem-vane design from a 740i. Other than an additional 10mm pressure port, to support the ABS system (pressure accumulator), I don't see any functional difference between the 740i pump, and one out of a non ASC+T vehicle.
Ports are configured as follows:
1) Pump out to rack: 14mm x 1.5mm Banjo
2) Pump in from reservoir: 18mm Banjo
3) HP port on rack: 14mm
4) LP port on rack (to reservoir): 16mm
Incidentally, the port sizes on the e36 rack are the same as the stock M20-equipped e30.
It would be preferable, to *not* mount the reservoir in the stock location, since it will undoubtedly be exposed to significant radiant heat from the exhaust manifolds. As a result, it would be great to mount the stock reservoir, or a custom reservoir in a more "friendly" location.
The only "high" pressure line is the 14mm line from the output of the pump to the top port on the rack. Everything else will see either low pressure, or slight vacuum (input line to pump). These lines were simply clamped to the OEM reservoir, after all.
Parker makes adapter fittings, to convert the metric banjo port to an AN male. The 14mm becomes a -6AN, the 16mm becomes a -8AN, and the 18mm becomes a -10AN. We can use standard AN hardware and hose for the two low pressure lines, and have a single HP line made up with -6AN hose ends, in the lengths and orientations to make it clean and sensible.
What have others done?
-Bruce
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