Electric Power Steering Control with VEMS

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Electric Power Steering Control with VEMS

Postby Grillage » Sat Apr 16, 2016 7:26 am

Is it possible to have VEMS trigger an MR2 power steering pump based on wheel speed? I'm getting ready to install one on my V8 Coupe after trying many alternatives to get the V8's pump to work right (it has 50 bar too much for the coupe's rack to handle)

I currently have my intake manifold switchover triggered via MISC2 output but that's triggered at a certain RPM.

it looks like I could trigger the MISC outputs on one of the extra settings like this:
Image

Has anyone done this before? Or is this a dumb idea?
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Re: Electric Power Steering Control with VEMS

Postby viridia » Sat Apr 16, 2016 9:57 am

You've got the 2nd gen MR2 pump with the VSS input? I recall seeing a thread about a guy with a function generator mapping frequency and rpm/amps. Can't remember if he specified what the signal needs to be, in terms of voltage. I'll see if I can find it again...

I've shied away from this pump because it's so expensive. Keep updating this is good stuff.
87 4k, 90 f350, 91 v8, 93 v8, 04 s4
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Re: Electric Power Steering Control with VEMS

Postby Grillage » Sat Apr 16, 2016 10:23 am

I did find the later one with the reservoir and the VSS. I thought about the Volvo one too but after a search of the nearby junkyards I found 3 or 4 cars where they were already pulled.
I ended up getting the MR2 pump from the UK for about $150 on ebay. the cheapest I found it anywhere. I eagerly await its delivery - hopefully in time to get running for the drive to Carlisle in May

Those Volvo pumps are CAN-BUS so maybe a little less compatible? I dont really know.

I'll update my build thread once I get it all working.
CURRENT
1995 90 Quattro
1994 Cabriolet - 5 speed
1986 Maserati Biturbo Spyder
2011 A4 Avant


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1993 Audi 90 CS Quattro - 1990 CQ - V8 - 1995.5 Audi S6 - 1993 Audi V8 - 2013 A5 Prestige
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Re: Electric Power Steering Control with VEMS

Postby varia » Sat Apr 16, 2016 10:39 am

i like where this is going.
¯\_(ツ)_/¯

project 2226
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Re: Electric Power Steering Control with VEMS

Postby Grillage » Sat Apr 16, 2016 10:42 am

I think the other question would be when to have it kick off. Would I just turn it off at highway speed? so maybe 90 km/hr or so?
CURRENT
1995 90 Quattro
1994 Cabriolet - 5 speed
1986 Maserati Biturbo Spyder
2011 A4 Avant


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1993 Audi 90 CS Quattro - 1990 CQ - V8 - 1995.5 Audi S6 - 1993 Audi V8 - 2013 A5 Prestige
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Re: Electric Power Steering Control with VEMS

Postby audifreakjim » Sat Apr 16, 2016 10:52 am

You don't want to have it kicking on and off, it could get you into trouble by having your steering input double or triple unexpectedly. If you can get the consistent variable speed working, that's what I would shoot for. If you were to just do an on/off, I would have it off at idle
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Re: Electric Power Steering Control with VEMS

Postby Grillage » Sat Apr 16, 2016 11:01 am

That's an awful good point
CURRENT
1995 90 Quattro
1994 Cabriolet - 5 speed
1986 Maserati Biturbo Spyder
2011 A4 Avant


PAST
1993 Audi 90 CS Quattro - 1990 CQ - V8 - 1995.5 Audi S6 - 1993 Audi V8 - 2013 A5 Prestige
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Re: Electric Power Steering Control with VEMS

Postby audifreakjim » Sat Apr 16, 2016 12:55 pm

I have been running mine full blast for 10+ years without any issues
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Re: Electric Power Steering Control with VEMS

Postby Grillage » Sat Apr 16, 2016 1:35 pm

:thumbsup:
CURRENT
1995 90 Quattro
1994 Cabriolet - 5 speed
1986 Maserati Biturbo Spyder
2011 A4 Avant


PAST
1993 Audi 90 CS Quattro - 1990 CQ - V8 - 1995.5 Audi S6 - 1993 Audi V8 - 2013 A5 Prestige
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Location: Cincinnati, OH

Re: Electric Power Steering Control with VEMS

Postby gabriel.b » Fri Jul 29, 2016 4:39 am

Grillage wrote:I did find the later one with the reservoir and the VSS. I thought about the Volvo one too but after a search of the nearby junkyards I found 3 or 4 cars where they were already pulled.
I ended up getting the MR2 pump from the UK for about $150 on ebay. the cheapest I found it anywhere. I eagerly await its delivery - hopefully in time to get running for the drive to Carlisle in May


What years did that pump come off of? I need to acquire one for my coupe for the o7K swap
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Re: Electric Power Steering Control with VEMS

Postby Grillage » Fri Jul 29, 2016 6:44 am

Here's the writeup I used. All the info is in there:
http://www.k20a.org/forum/showthread.php?t=58599
CURRENT
1995 90 Quattro
1994 Cabriolet - 5 speed
1986 Maserati Biturbo Spyder
2011 A4 Avant


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1993 Audi 90 CS Quattro - 1990 CQ - V8 - 1995.5 Audi S6 - 1993 Audi V8 - 2013 A5 Prestige
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Location: Cincinnati, OH


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