Powered Steering Conversion

Powered steering now complete, but it was a difficult modification with very tight clearances. So if your not up for a challenge buy a kit.

The Steering wheel is MG ZR which fits the Rover 400 column and switch gear.  Lights and windscreen wipers are now column mounted, so the dash board mounted switches were rewired when the new loom was made.

 

I have selected a rack with 2.75 turns lock-lock and 5.5 inches of travel. Having an external ram instead of the usual built-in hydraulics means it is more compact than most, but still needs off-setting. 

Peugeot 205 left-hand drive rack reversed to suit right-hand drive

This is a non standard rack position with the distributor-less front cover which gives less clearance, so some of the problems I had may not apply.

 The ram has been flipped over so the pipes face outwards, but spacers are then required for the pipes to clear the pinion housing. With a remote filter setup I may have been able to get away without this modification.

Assembly involves dropping the front sub frame or removing the angled filter, so it's not ideal. 

The standard Range Rover powered steering pump is where the radiator return hose wants to be so the radiator was modified with a center feed.

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Standard radiator top is too thin in middle for center feed, so alloy replacement was acquired.

The distance between the inner control arm joints is less than the MGB, therefore the rack will have to be mounted lower. The final mounting position was 3/4" off-set from center to clear the chassis rail and 9.5" off the ground instead of the standard MGB rack height of around 12". The steering arms had to be lowered to suit as calculated on my Wishbone Design Program. 

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The control arms have been centered giving unequal travel on the rack of 2.0" one way and 3.5" the other which was reduced to 2.0" with a 1.5" nylon ring under the gator.   Steering arm lengths have been shortened to increase the wheel to rack travel ratio. 

This high ratio rack and short steering arm combination should make the steering very quick and sensitive. Hopefully not too quick!

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The pressure and return lines fouled the oil filter take-off so instead I have ran them through the x-member in a 3 inch pipe

I believe the official MG Owners Club conversion uses a Peugeot 306 rack, which also appears to have been off-set. The 306 rack is probably wider than the 206, so would suit the higher position they have mounted it in, which is close to the standard height.

I have fabricated my own hydraulic reservoir. Which mounts neatly on the inner wing behind the MGR headers.

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The return from the rack has a standpipe with a side exit so it does not squirt upwards with return pressure (pictured left). The feed back to the pump is wire gauze filtered (pictured right).

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The base of the reservoir was made from 1/2 inch plate so that the reed/return fittings could be tapped in directly.

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I have mated the collapsible end of a rubber bumper column shown below to the shorter Rover 400 rack.

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Collapsible end of a rubber-bumper column with tube outer joiner sleeve welded on

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Rover400 column with joiner sleeve inserted.

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Both halves ready for welding using stepped inner sleeve for location

The forward section now mounts on the rubber- bumper firewall, which I cut out of a scrap car and welded into my firewall.

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Rubber- bumper column mount ready to weld into chrome-bumper firewall

The single bolt mount in the 400 column lines up with the standard mount under a chrome bumper dash only. 

Columns merged and ready to mount