mrlegoman

Sub to post.
Interesting.........(wheels churning in head)

Mr.OB*GYN_Rhett

iTrader: (2)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JOEY F. &raquo;</TD></TR><TR><TD CLASS="quote">Wow, this is awesome. Id def be up for buying a kit when it comes out. </TD></TR></TABLE>
Agreed

George Knighton

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by KIWI &raquo;</TD></TR><TR><TD CLASS="quote">...frankly the saving in HP is less important to me than the [comfort] of the power steering.
</TD></TR></TABLE>
I'm absolutely convinced that it'd be faster and less tiring to have left the power steering on my K20A/DC2 ITR track car. It's very pleasant driving a B18/DC2 ITR with OEM power steering compared to driving my track car with no power steering.

bazda

Hey guys,

I'm currently in the middle of putting on of these into my car on the fire wall.


I figured out easily how to adapt a controller which was easy to install and cheap.
So i searched DC motor controllers and found there are many controllers out there! Even on EBAY. The best controllers is this one made fron 4QD but its quite expensive.
http://www.4qd.co.uk/prod/proMk2.html

In my country jaycar also make them, although only rated to 40A output, this might still be enough power for the electric PS, if not you can easily change the mosfets to higher rated ones and also change the current limiting circuit easily.
http://www.jaycar.co.nz/produc...CATID=

I'm sure in the US there are plenty of places that sell these types of controllers.

So once you have the controller, you will need some sort of resistance reference, either be speed, revs and steering angle. Or you just have a **** on your dash board and you can vary the speed ur self .

I think the best bet would be a angle sensor on the steering column. Speed/revs, if the car is stationary the pump will be going fast.

Autocratic

Has anyone seen this pump by Tilton? I looks like it might be a decent alternative if you can't find a MR2 pump.

http://www.tiltonracing.com/pdfs/43.pdf
http://www.tiltonracing.com/co...2&m=d




<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">The Tilton Differential Pump is a positive displacement type of pump, so its
output is directly proportional to the motor speed. If a lighter load increases
the motor speed by 25%, then the flow rate increases by 25%.</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">This pump has a very light weight at 3.5 lbs and has a
flow rate of 1-2 gallons per minute</TD></TR></TABLE>

Jaker

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Autocratic &raquo;</TD></TR><TR><TD CLASS="quote">Has anyone seen this pump by Tilton? I looks like it might be a decent alternative if you can't find a MR2 pump.
</TD></TR></TABLE>

Unfortunately, it is nowhere near high enough pressure. The Tilton is max 60 psi, and the power steering system typically sees 900-1200 psi.

Autocratic

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jaker &raquo;</TD></TR><TR><TD CLASS="quote">

Unfortunately, it is nowhere near high enough pressure. The Tilton is max 60 psi, and the power steering system typically sees 900-1200 psi.</TD></TR></TABLE>

well then...nevermind

FlatBrokeHatch

Great info. Even though I'm sure I'll never get around to doing this...I sure wish I had the motivation.

bazda

I just got my electric PS running
It works AWESOME. If you have torque steer you can turn up the power (if you have a controller) and will be able to hold the steering straight. Or if you run it at full power then its fine.

Its a little noisy, like the same noise as a window washer bottle pump going all the time.

So i'll be re-mounting it in the boot (with reservior) and running lines to the front of the car. Should give me lots more room.

rice r0cket

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jaker &raquo;</TD></TR><TR><TD CLASS="quote">How would it be any different to have the sensors built into the rack, and feed the input from the steering wheel via the steering column to these sensors versus having the sensors in the steering column up by the steering wheel?

EDIT:

I've done some research now. The S2000 uses the electric power steering rack, a rack mounted "torque" sensor where the steering shaft/column attaches, a power steering control module, and signals from the speed sensor and the tach. I think the speed signal needs to be the same high frequency signal that everyone pines for to permit the use of the S2000 cluster in EKs, EGs, etc... but we all know there are signal converters out there. Now the only parts left are mounting the rack in your chassis, and adapting the tie rods and the steering column attachment.

Sounds like it could be a little simpler than the MR2 power steering pump, assuming the rack mounting can be done without too much hacking. I think I might give this a try.

Anyone interested in all the MR2 power steering system components, except for the steering column sensor? I have the pump, the controller, the power relay, a bunch of wire attached to the appropriate plugs, and some sections of the power steering lines for fittings.

EDIT #2

Scrap that idea. The S2000 is a front steer car. The damned rack will make the wheels turn the wrong way.


Modified by Jaker at 8:39 PM 8/2/2008


Modified by Jaker at 8:42 PM 8/2/2008</TD></TR></TABLE>

So the Fit has EPS. Dunno where the rack is, but I'd assume rear mount because of the compactness of the whole front end. Thoughts?

Edit, apparently the EP3 Si does as well.


Modified by rice r0cket at 10:18 AM 9/26/2008

Jaker

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rice r0cket &raquo;</TD></TR><TR><TD CLASS="quote">

So the Fit has EPS. Dunno where the rack is, but I'd assume rear mount because of the compactness of the whole front end. Thoughts?

Edit, apparently the EP3 Si does as well.


Modified by rice r0cket at 10:18 AM 9/26/2008</TD></TR></TABLE>

The configuration of the rack from the EP3 is very different than the EF/EG/EK/DC/etc... in that the tie rods (inner and outer) are quite long, and meet up in the middle of the rack itself. This may be the case for the Fit as well (don't know, haven't seen one). This may not work with the chassis configuration in the older cars, as I know for a fact that the tie rod goes through a smallish opening in the chassis on the EF, and the movement of the tie rod with the EP3 power steering rack would likely interfere with that area.

Kind of like this one (this is an Insight rack, but the EP3 is the same):




Modified by Jaker at 8:11 AM 9/26/2008

uniseriate

Does anyone have access to a Saturn Astra? It has electric hydraulic power steering similar to the MR2 pump but I would assume to be lighter and/or more efficient as the technology is much newer. One big plus is that the reservoir is integrated into the unit. Saves space and looks neater.

Here is a picture of the pump out of the current European Astra:



I am interested in finding out if the US version is similar and how it is controlled.

uniseriate

Dug around and found this presentation by TRW, one of the major manufacturers of EHPS systems. It looks like that Astra unit in that previous post is the TRW 56-B, a second generation motor pump unit. There is now a more efficient, higher output, third generation of motor pumps unit out there. I just have to find out which vehicles are using it and if they are available in the US.

One of the cooler features that the latest TRW units offer is that some offer two speeds of operation without the need for a steering rate sensor. There is an ECU integrated into the motor pump unit that can allow that and other advanced features such as adjusting the assist curve automatically based on temperature and the resulting oil viscosity.

George Knighton

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rice r0cket &raquo;</TD></TR><TR><TD CLASS="quote">
Edit, apparently the EP3 Si does as well.
</TD></TR></TABLE>
You wouldn't want to directly copy the EP3 EPS in a performance application, IMHO.

The EP3 EPS was easy to defeat even in the 160 HP K20A3 USDM Si configuration.

You could literally turn the wheel so fast you'd hit resistance, and this could cause some consternation in a performance environment.

I like this thread. Lots of good ideas in here.

kommon_sense

Work looks good. I would recommend some urethane bushings to isolate the pump bracket from the firewall. That pump has a fair amount of vibration. A little isolation will help its lifespan.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bazda &raquo;</TD></TR><TR><TD CLASS="quote">Hey guys,

I'm currently in the middle of putting on of these into my car on the fire wall.

</TD></TR></TABLE>

drift2004

can it work with a manuel steering rack from a civic eg cx

KIWI

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drift2004 &raquo;</TD></TR><TR><TD CLASS="quote">can it work with a Manuel steering rack from a civic eg cx</TD></TR></TABLE>

No- You must have a power steering rack.

It's interesting to see the diversified ideas that have come out of the woodwork since I first posted this article almost a year ago.
I recently got to drive our #65 K-20 Powered Integra after a long rebuild. Desperate for some seat time we went to Buttonwillow for a private test day to see how the new GEAR-X Close Ratio gear set performed. I drove out onto the track and after a few warm up laps and a couple of pit stops to check tire temps and pressures I proceeded to put the hammer down. After 15 or 20 laps it all started to come back to me and I was extremely impressed with the new ratios. We quickly got down to consistent 1.57's which is about 3.0 seconds under my best ever time, and pretty respectable on the Time Attack course.
I pulled in for a break and to check things over... When I got out of the car I said to the guys " I must be getting too old for this, I'm worn out!"
My Crew Chief Eric said " How does the Power Steering feel?"... What! I forgot to turn the Bloody thing on!
Well after a break and a change of tires etc. I got back in the car for another session... Switched on the Power Steering and off I went... Ahhhhhhhh Bliss!
Sooooooo much better! I could not believe the difference! Went faster too.

We recently fitted a Toyota MRII PS Unit to Steve Rays Corvette Powered 944 Porsche endurance car...
Steve supplied a new Porsche PS Rack and a new Toyota MRII PS pump. We mounted the pump in the rear above the diff, and ran the High and low pressure lines to the Rack and the reservoir mounted up front under the hood. The whole project was quite straight forward, but we were a little dubious as to how the pump would perform with those 12" wide slicks?
Steve picked up the car on a thursday night and went straight to the track for a test day. I recieved a phone call on Monday morning from a very happy and satisfied customer! The system performed flawlessly all weekend and made the formerly heavy and very tiring IMSA car a pleasure to drive.
So the Toyota MRII pump appears to be the way to go... And my hats off to those of you who have gone to the trouble of hooking up the variable pressure electronics Thats still way beyond my capabilities.

Good luck

Kiwi




Modified by KIWI at 9:14 AM 10/2/2008

bazda

Finally got my car out to the track with the electric PS with the variable controller.
This worked awesome!, I was able to use the pump at VERY low power, therefore you can hardly hear the pump. I could turn the power up but felt a bit too assisted. Have to run it at higher power for around town driving.
Also mounted some foam to the mounting points which takes away alot of the noise fromt he pump.
Over all very happy with the pump.

Super79Dave

http://cgi.ebay.co.uk/BMW-Mini...10457

another option possibly to the mr2 pump is the MINI.
Looks like they fail alot so maybe available on the cheap.
Haven't looked at wiring at all just saw a pump and went hey.

Autocratic

Alot of the Mini pump suppliers on Ebay are re-man services, so they want you to send a pump back. It's still an option though.

GPNY

Bringing this back from the dead...
Has anyone here used the Subaru XT6 pump. If you did, what fluid did you use and how well is it holding up?
I have both a subaru pump and a european Citroen Saxo pump and I'm debating on which one to use and what kind of fluid to use...
- Subaru pump means subaru Cybrid Fluid
- Citroen Saxo Pump - Anyone know which fluid I should use (I've heard dexron 3 but would love confirmation
- Integra Rack -Honda Power steering fluid - Would using another type of fluid such as cybrid or Dexron screw up the rack?
I also got a 100amp pwm to control whichever pump I end up using...

rice r0cket

Has anyone tried a pump from the newest of the MR2's? The only thing that concerns me is the car was originally 2000 lbs or something, so it might not be up to the beating that'd I put on it. It also has a built in reservoir like the Astra pump, so it'll simplify the setup a bit.

98SpecR

Covered. Click here: EHPS Redone read and enjoy.

rice r0cket

Have you tested it in any situations? I'm more concerned about it cutting out in hard cornering, because the MR2 Spyder was pretty damn light...


Edit, nevermind. I see what you posted. Thanks.

crazyimport

So did you guys develop a complete kit for this?