control your power steering ?? it's riddle time

[NashMan]

well for long time i have wanted to control my power streeing for diffnet events i was doing

drift
windy road
auto cross

ect


now i had the big old plan of useing the mr2 eletrcal pump but it's kinda big clumsy and back when i had a 86 is was good idae but now since i have 92 with a PPS my mind has since changed since the 92 PPS feels very nice compare to my buddies 89 with does not transfer as smooth


any ways i wounder if i chould control it i have herd you choudl even makes even less power asits at higher speed


to me it being 2 wire you choudl just throw a reostate on it and hook it up in the dash and relaye for when you wana trigger it back to stock

if i am out to luch pleas tell em but liking this idea so far

 

[NashMan]

here is the diagram now i just got to find out were they put the computer does any one know ?

all i got find is i max vavlues of the silnoide will do which i can do on the dyno wheil the car is not moven and make shit easy that or on the street

i really think this will work and be pretty cool thing

plus for drag and youcan simple just trun the power streeing off so there is less drag on the motor

http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=D&P=13

 

[jetjock]

if i am out to luch pleas tell em but liking this idea so far

You're out to luch....

 

[Wiisass]

What?

 

[Enraged]

ryan was considering trying to run an MR2 electric power steering pump instead of the stock belt-driven pump. He was wondering if, because it simply has 2 wire, he could simply wire in a rheostat to control the speed of the pump, thus controlling the level of power assist. That way, he can have different "settings" depending on what he is doing, ie drifting, autox, parking, etc.

 

[Wiisass]

So using the Mr2 pump with the PPS computer?

Does anyone know how exactly the PPS works? Like what inputs it has, what amount it affects the pressure, etc? All the technical details on it.

 

[jetjock]

I know how it works from both the electronic and hydraulic standpoints. If I read his message right he'd already abandoned the MR2 pump idea and wants to control the stock PPS instead. I'm not saying it can't be done but it'd be more involved than he's suggesting. Frankly I don't see the point in it.

 

[suprabad]

The rheostat idea might actually work but it's never been tried as far as I know.

Sounds simple enough, if I had a later model supra I'd give it a shot just out of curiosity.

Threre's always somebody around to tell you your bent for trying anything off the beaten path.

If you give it a whirl be sure to post and report your findings.

 

[IJ.]

PWM output on a standalone with a speed and steering angle input could do it I guess, question is why?

 

[NashMan]

well all i got to do is scope it really so see how it works

streeing angle i can not see being factor since the computer does not tie into any thing like that

hummmm now here is the other qestion were does this computer live in the car


all so woundering if is is pusle or stead curnet like 1 to 5 volts ect

 

[IJ.]

Well the car already has a Steering Angle sensor

Never played with PPS so not really sure of how the electricals are done but I know they spin the pump faster to give more assistance at low engine speeds.
(non pps has a larger pully)

 

[jetjock]

The PPS computer is behind the glove box.

I didn't say he was bent, I said I personally don't see the point in it. It's a pity those who think it's simple don't have PPS to try it on because I'd love to read the whining afterwards about how their system no longer works at all. That's the trouble with this place: Bad advice from those who don't know what they don't know. They should leave the heavy lifting to those who do.

 

[Enraged]

my interest is in the MR2 pump, as using it would be a nice way to clean up the engine bay a bit, ie simply esthetic

 

[staticpat]

I don't know how the mkiii pps works. In my rx-7 however a stepper motor controls a valve that affects the amount of pressure. My power steering computer (controls the stepper motor) crapped out, but I was able to manually set the stepper motor to an acceptable level.

I had played around with the idea of making a controller to move the stepper motor via switches. This would allow you to hard set a level depending on what kind of driving you will be doing. Of course this defeats all the logic that was originally intended (ie. steering angle, speed).

Don't know anything about the mkiii unit. Just throwing ideas out.

 

[Insidious Surmiser]

ryan was considering trying to run an MR2 electric power steering pump instead of the stock belt-driven pump. He was wondering if, because it simply has 2 wire, he could simply wire in a rheostat to control the speed of the pump, thus controlling the level of power assist. That way, he can have different "settings" depending on what he is doing, ie drifting, autox, parking, etc.

seems like a valid idea to me: why would you want to vary the speed though?

 

[NashMan]

sweet my glove box is out all ready just got to find the max vavlues then grab out form wreaking yard and start to have some fun lol

The PPS computer is behind the glove box.

I didn't say he was bent, I said I personally don't see the point in it. It's a pity those who think it's simple don't have PPS to try it on because I'd love to read the whining afterwards about how their system no longer works at all. That's the trouble with this place: Bad advice from those who don't know what they don't know. They should leave the heavy lifting to those who do.

 

[Wiisass]

I know how it works from both the electronic and hydraulic standpoints. If I read his message right he'd already abandoned the MR2 pump idea and wants to control the stock PPS instead. I'm not saying it can't be done but it'd be more involved than he's suggesting. Frankly I don't see the point in it.

Could I trouble you for a quick explanation? I've just never dealt with it. I have seen several other setups that all work a little differently but seem to be the same idea, but I'm kind of interested in how exactly the supra setup works.

From just some quick looking at the TSRM, it makes it seem that the solenoid is either open or closed. And it just changes after reaching a certain speed. Or is it more variable than that. If it's only 2 positions, then what Nashman is trying to do, won't work at all. And could potentially fry the solenoids if too much voltage is applied. But that's all I could get out of the TSRM.

Tim

 

[jetjock]

It's a proportioning valve Tim. PWM driven. Note the TRSM's warning of applying full power to it for longer than a few seconds. Also note the standard signals at idle and at speed. Do either of those imply a run of the mill solenoid? And as a suspension specialist what does the word "progressive" mean to you?

The hydraulic circuit should be self explanatory.

Nashman, since I'm in a good mood today:

http://tinyurl.com/2zagfs

As I said this is not the way to do things. Better would be to manipulate the speed input. If you or anyone else decides to try this and burns out the valve, screws anything else up, or ends up being hosed out a wreck it's not my fault.

 

[Wiisass]

Thanks JJ, In my quick looking over, I assumed that the idle up was a seperate solenoid and then the PPS solenoid would activate at a given speed and decrease the amount of assist from the pump. In this case, I thought progressive was only 2 stages not including idle. More of a marketing progressive than a true progressive.

Alright, well now that I have a much better idea of what Nash is trying to do. Let me ask, besides the adjustability of the steering system, what are you trying to accomplish? Are you trying to just scale the amount of assist through the PPS system, but still keep it speed sensitive? Or are you going to end up with a fixed amount of PS assist no matter what speed?

Have you considered just under driving the pump? Or any other options for achieving what you want? And I'm not really sure why you would want different assists for drifting versus autox versus mountain roads. Are you just looking for better feedback at the wheel from steering inputs?

 

[NashMan]

changeing the speed sencer whould be a pain and need mirco procers

as for the restate that is what i wanted to do to bring up the max vavle in case the stock max vavle is max at alike 80 k or so withc i am not sure as of yet


but if i was to make a mirco procers to control the pps at any rate who whould be intreasted

as in if i was to make a kit ???

It's a proportioning valve Tim. PWM driven. Note the TRSM's warning of applying full power to it for longer than a few seconds. Also note the standard signals at idle and at speed. Do either of those imply a run of the mill solenoid? And as a suspension specialist what does the word "progressive" mean to you?

The hydraulic circuit should be self explanatory.

Nashman, since I'm in a good mood today:

http://tinyurl.com/2zagfs

As I said this is not the way to do things. Better would be to manipulate the speed input. If you or anyone else decides to try this and burns out the valve, screws anything else up, or ends up being hosed out a wreck it's not my fault.