hodge Posted April 5, 2012 Share Posted April 5, 2012 Hi guys. I've been looking into this over the last week or so and think I'm going to give it a go. After chatting with David.P for a while about it makes me think, it can't be that hard to convert. (I will get 5mins to give you a call mate, sorry). In hindsight, the way I'm going to do it is using the same sort of basic setup but instead of a belt driven pump I'll use an electric one. It will still have a resevior but it just means I can fit them wherever I wish, and I do like relocating things out of sight. Now this setup comes with its own ECU, I'm assuming this will control current to the pump telling it wether it needs to go faster or slower and for the speed controlled PAS feature. So, I would have thought the wiring would be pretty straight forwards. I'm going to or am looking into using the same setup used in an MR2. All I need to really find out is the pin out's for the PAS ECU and the pin outs that go from the loom. Any help, advice or opinions would be welcome. Aparently it's a common conversion in the drift community so it has and can be done. Cheers John Quote Link to comment Share on other sites More sharing options...
bignum Posted April 5, 2012 Share Posted April 5, 2012 Whats the point, the steering on the supe is fine anyway, i think dave p has rubbed off on you:taped: Quote Link to comment Share on other sites More sharing options...
Stevo Posted April 5, 2012 Share Posted April 5, 2012 Best of luck dude - sure you'll crack it in no time! Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted April 5, 2012 Share Posted April 5, 2012 That would be an awful shame. The steering feel would disappear. Quote Link to comment Share on other sites More sharing options...
hodge Posted April 5, 2012 Author Share Posted April 5, 2012 Whats the point, the steering on the supe is fine anyway, i think dave p has rubbed off on you:taped: Why not?? I've been thinking about it for quite a while now. It's going to remove another pulley from the drive belt, which in turn will have less turning force or the engine producing more power, maybe not a lot but every bit counts. But for me the whole exercise is about moving the pump a lot closer to the rack, so less pipework is needed and I can tuck the pump and resevior away somewhere discreet. Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted April 5, 2012 Share Posted April 5, 2012 Porsche has caught a LOT of criticism over moving to EPAS, and spent millions trying to develop a system that still doesn't work as well as an hydraulic setup. What you're suggesting will have a severely detrimental effect on the way your car drives, and I certainly wouldn't dream of buying a Supra with such a modification. Quote Link to comment Share on other sites More sharing options...
hodge Posted April 5, 2012 Author Share Posted April 5, 2012 Well it works fine in an MR2, so I can't see the issue TBH. Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted April 5, 2012 Share Posted April 5, 2012 Depends what you value most I suppose. You'll be detracting from the driving experience in the name of aesthetics. Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted April 5, 2012 Share Posted April 5, 2012 Also, you say it works 'fine' on an MR2 but I'd love to drive the two back-to-back and see for myself. Quote Link to comment Share on other sites More sharing options...
hodge Posted April 5, 2012 Author Share Posted April 5, 2012 It's a simple case of swapping back if I don't like how it performs, probably a 30min job. In the name of being enquistive I'm going to give it a go. Quote Link to comment Share on other sites More sharing options...
Colin-mkiv Posted April 5, 2012 Share Posted April 5, 2012 It's a simple case of swapping back if I don't like how it performs, probably a 30min job. In the name of being enquistive I'm going to give it a go. I love a pioneering spirit. Quite possibly the next 'must have' mod? Quote Link to comment Share on other sites More sharing options...
hodge Posted April 5, 2012 Author Share Posted April 5, 2012 Well let's see how it all goes first but I can't see it being a poor setup. Odviously Toyota will have spent millions developing this for the MR2s due to the engine being in the back. The pump is getting fed in the same way as a stock pump, and being fed from a resevior but instead of it being attached to the drive belt it's electric. Quote Link to comment Share on other sites More sharing options...
Gaz6002 Posted April 5, 2012 Share Posted April 5, 2012 I love a pioneering spirit. Quite possibly the next 'must have' mod? Not for anyone who enjoys driving their Supra Quote Link to comment Share on other sites More sharing options...
Digsy Posted April 5, 2012 Share Posted April 5, 2012 Its probably a popular mod with drifters because they spend a lot of time at max revs on close to full lock - hence the HPAS will be a big drag on the engine. If you are not planning to do this then it sounds like a lot of hassle for very little gain as the load on the PAS pump will be very small when you are driving in, or close to, a straight line. Quote Link to comment Share on other sites More sharing options...
Shane Posted April 5, 2012 Share Posted April 5, 2012 (edited) Because I stuck the Isuzu engine into the Tigra I use, it was going to be a mammoth task to fit an engine driven pump. Citroen saxos and some Pugs use EPAS and the I found one from a Saxo complete with its own reservoir, works a dream and has done for over a year now. I was thinking I would need to design a bit of electronics to kill the motor at high speed, but it really doesnt need it. I think maybe there is a lockout mechanism as part of the rack as it feels fine even on motorways flat out. I was also concerned that the motor would draw loads of current but in fact unless you are turning the wheels, the motor is under no or very little load and draws less then an amp after start up. Was no hassle at all to plumb up, bassically a flow and return pipe, the flow is under high pressure and needs good joints. Its also a popular mod with some of the old school car modders. My brother does silly things to old vauxhalls and his latest creation is a PB cresta with a V8 in, and he usually goes down the epas route too. Edited April 5, 2012 by Shane (see edit history) Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 5, 2012 Share Posted April 5, 2012 (edited) You won't gain any more power at all. The PAS uses energy in hydraulic format. Whether it comes from a hydraulic pump driven by the crankshaft via a belt, or from an electric pump run from the battery makes no odds. The battery is being discharged. A great deal by electronic PAS as they draw a hell of a lot of current. This has to be replenished by the alternator, which uses engine power. A lot of engine power to replace a lot of Watts taken out. When the power steering isn't being loaded, as in driving in a straight line, both engine driven hydraulic and electronically driven hydraulic pumps consume little energy. Theres's a LOT to the control strategy (mapping of electronic PAS, if you like), and the production systems are usually only JUST powerful enough for their given application. Now, be honest John, you aren't interested in the power saving, it's all part and parcel of your obsession with an empty engine bay, isn't it? Just by a bare body shell, paint it show quality, and be done with it, for Gawd's sake..... Edited April 5, 2012 by Chris Wilson (see edit history) Quote Link to comment Share on other sites More sharing options...
hodge Posted April 5, 2012 Author Share Posted April 5, 2012 Ok you got me Chris, I'm just wanting to empty the bay a little more. That word "odsession", can we really call it that, or do I start agreeing with the wife and admit I have issues But thanks for helping me realize my illness Quote Link to comment Share on other sites More sharing options...
Colin-mkiv Posted April 5, 2012 Share Posted April 5, 2012 .......hahaha, darn it....foiled by science Quote Link to comment Share on other sites More sharing options...
supra steveo Posted April 6, 2012 Share Posted April 6, 2012 I can't wait till your old your wheelchair is gonna be mint lol Quote Link to comment Share on other sites More sharing options...
hodge Posted April 6, 2012 Author Share Posted April 6, 2012 I can't wait till your old your hoverchair is gonna be mint lol I've corrected that for you bud Quote Link to comment Share on other sites More sharing options...
hodge Posted April 6, 2012 Author Share Posted April 6, 2012 Ok, so I've done a bit of research (google is a wonderful thing) and this is a pi$$ easy job to do. There's loads of jap cars have done this from Scion to honda. Judging by the numerous amounts of info I've read it doesn't effect the performance of the PAS at all. All it's doing is just replacing the conventional belt driven pump to an electric unit. The speed controlled PAS on a supra also won't change because this is controlled by the ECU direct to the rack and has nothing to do with the pump. The only hardware I'll need is a MK2 MR2 PAS pump, resevior, a good 30A relay and the nessessary cable to wire it all up and job done. As the pump will be taken from the ignition switch to the relay, a definate plus side I can see is the engine doesn't need to be running to engage the PAS, just need the ignition turned on. This will prove very handy for me seems when I'm working on my car it's mostly late at night, and when the car needs moved around its going to be a lot easier to move with the PAS working. As I've said in previous posts, it's a simple swap, so if it's not for me the it's only going to take me about 30mibs to swap back to a conventional belt driven pump again. So I guess why the hell not try it. Quote Link to comment Share on other sites More sharing options...
Polo Posted April 6, 2012 Share Posted April 6, 2012 Iv done a few conversions, no ecu or complicated stuff needed, just a 12v hydraulic pump with a pressure releaf valve, which switches on with ignition. Was going to do this on mine as I was fed up of the thing spitting belts off a craping pumps! But in the end I made a 350z pump fit the JZ, not had a problem since. Iv also fitted a 200sz s14 PS pump to another JZ and that also sorted all his problems. Quote Link to comment Share on other sites More sharing options...
hodge Posted April 6, 2012 Author Share Posted April 6, 2012 Iv done a few conversions, no ecu or complicated stuff needed, just a 12v hydraulic pump with a pressure releaf valve, which switches on with ignition. Was going to do this on mine as I was fed up of the thing spitting belts off a craping pumps! But in the end I made a 350z pump fit the JZ, not had a problem since. Iv also fitted a 200sz s14 PS pump to another JZ and that also sorted all his problems. Have you any pics of them fitted, especially how you fitted the pressure release valve. Quote Link to comment Share on other sites More sharing options...
Shane Posted April 6, 2012 Share Posted April 6, 2012 I wired mine up with the earth from the trigger relay connected to the handbrake switch, so main relay for the epas only engages when the handbrake is released. no point in the pump running when the handbrake is on. I seem to remember that the Astra mk3 has a pump with a built in reservoir that fits to the bulkhead, I didnt have enough room for that on mine though. This is what I used: http://www.ebay.co.uk/itm/Citroen-saxo-electric-power-steering-pump-/251031145738?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item3a729f4d0a Quote Link to comment Share on other sites More sharing options...
hodge Posted April 6, 2012 Author Share Posted April 6, 2012 (edited) I wired mine up with the earth from the trigger relay connected to the handbrake switch, so main relay for the epas only engages when the handbrake is released. no point in the pump running when the handbrake is on. I seem to remember that the Astra mk3 has a pump with a built in reservoir that fits to the bulkhead, I didnt have enough room for that on mine though. This is what I used: http://www.ebay.co.uk/itm/Citroen-saxo-electric-power-steering-pump-/251031145738?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item3a729f4d0a What a good idea with the handbrake. I think I'll give that a go. How do you find the steering with the pump. Edited April 6, 2012 by hodge (see edit history) Quote Link to comment Share on other sites More sharing options...
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