Porsche 911UK Forum

Welcome to the @Porsche911UK website. Register a free account today to become a member! Sign up is quick and easy, then you can view, participate in topics and posts across the site that covers all things Porsche.

Already registered and looking to recovery your account, select 'login in' and then the 'forget your password' option.

Fitting electric power steering

Dammit said:
Chap on the 996 Facebook group did this - Aivars Riddlers.

Matt Faulks/PPBB commented about the control software being the most involved part of the whole thing, rather than the physical plumbing.

I'm kind of interested in this modification (frees up a pulley location) and kind of not (takes up boot space).

Dammit I have that on fb. I think Matt said there is a newer version which uses its own Ecu but aivars is the older simpler pump, just like what I'm doing
 
949135d1435495429-porsche-motorsports-electric-power-steering-conversion-kit-20150623_160550_resized.jpg


This image from Rennlist of the cup setup is quite useful. Clearly there's a power cable with a relay in it - presumably this is driven from the ignition switched live from the car itself.

A guy on 986 forum says:

- PS pump wiring is as follows:
red - battery +12V
brown - ground
black - ignition +12V (i.e., only runs when key is on)
blue/white - alternator dash light (to turn it off if the key is on but car not running)
brown/white - not required (for diagnostics)

As far as the plumbing goes I'd have a chat with a Pirtek shop if there's one nearby you. They've made me up power steering pipes before while I waited and have every conceivable hydraulic fitting normally in stock! Clearly there will be a high pressure line which will need crimped fittings. The return line will be at much lower pressure and will probably just need hose clamps.

Maybe worth getting a 986 steering rack so you can examine the threads at your leisure! I see there's one on ebay now for £60.
 
Shalmaneser said:
949135d1435495429-porsche-motorsports-electric-power-steering-conversion-kit-20150623_160550_resized.jpg


This image from Rennlist of the cup setup is quite useful. Clearly there's a power cable with a relay in it - presumably this is driven from the ignition switched live from the car itself.

A guy on 986 forum says:

- PS pump wiring is as follows:
red - battery +12V
brown - ground
black - ignition +12V (i.e., only runs when key is on)
blue/white - alternator dash light (to turn it off if the key is on but car not running)
brown/white - not required (for diagnostics)

As far as the plumbing goes I'd have a chat with a Pirtek shop if there's one nearby you. They've made me up power steering pipes before while I waited and have every conceivable hydraulic fitting normally in stock! Clearly there will be a high pressure line which will need crimped fittings. The return line will be at much lower pressure and will probably just need hose clamps.

Maybe worth getting a 986 steering rack so you can examine the threads at your leisure! I see there's one on ebay now for £60.

Thanks for that. My racks accessible atm as I've a lot of the stuff stripped off for other work and this is the time to take a stab at it.
I need to have a look and see where I can get the hoses through first to get a length and go from there
 
I like these projects, nice and easy.

Regards hoses into frunk; bring the two hoses through the firewall/frunk floor with 'bulkhead hydraulic fittings', it will keep the outside outside, and they will be ncie neat weatherproof penetrations.

As mentioned above you want the pump to only come on with engine running, NOT with just ignition live, this is usually achieved by taking a feed from the alternator exciter wire, which also feeds the charge warning lamp on the dash, to liven the PAS pump relay- (the charge light on the dash is earthed, then when the alternator is spinning it gives out 12v from the exciter connection, so giving the 12v across the dash charge lamp).

Can't think of another easy solution for a running only +ve signal..
 
That bears a strong resemblance to the pump I have.



MC
 
Thanks for the link. Some first class info in there. I just had a quick skim over it but will give it a proper going over when the kids are out n bed.

I'd really appreciate links or the likes or the parts. I had seen the tarret
Pulley before but I have ditched the air con so I'll worry about that later as I'll be dropping the engine for other work.
It'll probably run into more money that expected, it always does but it looks like you found some very handy solutions to the pipe work.
I really like the idea of ditching a lot of the standard pipe work as the air cons going as well. I have a little more chassis work to do so the less clutter under there, the better.
I'm planning on removing the spare wheel but I'll adapt brackets to allow it to be re fitted if needs be. I'll probably be keeping the carpet if possible. I'll have to see how it goes

All the info is greatly appreciated and if you can sus out the dockets for parts numbers that'd be first class.
As you can see I'm not the only one on this idea but was blind. I didn't even realise I had to cut a hole in the chassis. :floor:
 
Would it be an easier option to cut the high pressure hose somewhere on the rubber part and have a section crimped in with a union or what ever is used, a length of hose, another union and connected to the high pressure hose on the pump? I have a length of hose on the trw pump that was just cut off by the scrap man. All done by a proper hose specialist like Pirtek or whoever is close.

This would not only be a lot cheaper but a lot less waiting time on parts.
Or using the AN-6 method I see a lot on line fixing or replacing hoses. My past experience of AN-6 aren't great though tbh and I don't really trust them
 
TBH I am not 100% on what your explaining? – However provided you can get the connections and pipe runs to work you can pipe the pump to the rack any way that suits you.

AN is just a type of fitting, just like JIC, BSP etc, I am not sure what is not to be trusted? AN fittings are made to a tighter tolerance and higher standard than JIC. – AN-6 is the size, this matches the ports in the steering rack.

The Earls PS hose is of a higher standard than the OEM Porsche items, 3000 Psi operating pressure, many moons ago I was involved with a company that manufactured power steering pumps and hoses for Toyota, Landrover, Ford etc, OEM hoses are not tested to 3000 Psi.

AN parts are available from Earls off the shelf and Rebel Racing delivered in a few days. – You are however right in saying that the parts are expensive, the hoses and fittings alone came to circa £200.

I wanted to limit the amount of connections / joins to the absolute minimum, the more crimps, unions etc, the more potential failure modes, I also did not want to reuse any of the circa 20 year old parts.

My hoses are circa 750mm long, the high pressure hose has no joins and is a straight length of triple wire PS hose with a fitting one end and a fitting the other end.

The low pressure hose is the same, albeit with different fittings as a much lower pressure is required, the return at the pump end is held in place with a jubilee clip!

There is no definitive way to do this, the example pictures I posted show different install methods, just be sure that everything is safe and the parts and methods you use are fit for purpose, power steering is a very high pressure circuit and not somewhere you want failures, better, rather than easier, would be my steer.

Good luck :thumb:
 
I know exactly what your saying crash. It's not the cost, it's more the thought of trying to something from the states at this time of year.

On the AN fittings, I went this way making a bespoke fuel set up on my impreza. I was plagued with a smell of fuel at random times. It was possibly down to an injector seal but I never got to the bottom of it and a lot of others told me of similar issues.

I had a bit of momentum going with this build and I would like to get the front end finished so I can move on but I have to admit this has been a bit of an after thought.

But I'm an after thought type of guy :floor:
 
If you want a place that do high quality fittings and can get them to you quickly i recommend torques. He has an ebay shop, is incredibly knowledgeable and ive bought an insane amount of fittings from him with no issues.

Ive done power steering, fuel and breathers all with his fittings and hose without drama.

Just thought id pop that in there, im following this thread with interest, any chance i get to add AN fittings in i usually take it :D
 
Rosselder83 said:
If you want a place that do high quality fittings and can get them to you quickly i recommend torques. He has an ebay shop, is incredibly knowledgeable and ive bought an insane amount of fittings from him with no issues.

Ive done power steering, fuel and breathers all with his fittings and hose without drama.

Just thought id pop that in there, im following this thread with interest, any chance i get to add AN fittings in i usually take it :D

I've just seen your reply as I asked on the boxster group as well. I whipped the rack out tonight. I need to look at more pictures to get the mounting position right so I can measure the pipe length. I've already said I'm not keen on AN fittings from previous experience.
I also just want to use a rubber type standard hose if possible just to save any scoring of paint. I'll hopefully have something in place in the next few days if I can get a chance to get at it
 
I have also done this conversion in recent months. Mega easy. Gets rid of the terrible rust prone Porsche headlines. No difference in feel. Can hear the electric pump ever so slightly when doing things like 3 point turns if the radio is down.

Trw zafira/Astra pump is exactly the same as the Porsche cup pump

Also you can pick up the ignition live and engine running/alternator signal from the ABS pump. Can't recall the exact wire but I figured it out from the workshop manual wiring diagram. I also got my AN pipe fittings and Teflon pipe from Torques on eBay. Good quality and no issues.

Fittings into the Rac I bought from the USA at a cost of £90 delivered but a few local machine shops told me afterwards that they would of custom made the rack to AN-6 fittings for about £70
 
I had just planned to get a hose joined on to the original hose with a union and then get the other end to suit the trw pump.

Pauldeacs do you have any photos of whee you mounted the pump and brought the hoses through? I'm thinking either besides or below the abs pump.
 

New Threads

Forum statistics

Threads
124,354
Messages
1,439,446
Members
48,708
Latest member
JLav211
Back
Top