Everything You Need To Know About The MKIII (A70) Supra's Power Steering System

[@ottodidittoya]

Underrated and unappreciated

[@matthewgarcia9452]

Very appreciated

[@jacksin3323]

Great info, well explained. Thank you.

[@BoostRodeo]

Glad it was helpful to someone!

[@jadenberthoud505]

Great video! I'm curious though, how did you wire the progressive power steering to work with the MK3?

[@BoostRodeo]

89+ mkiiis came with pps factory so the computer is already there. My jz swap harness did not have the pps plug included so I ran a new 2 wire harness from the engine side of the M1 plug to power the solenoid like factory.

[@pistonsoup3749]

I now know a lot of not applicable information, but i watched anyway cause it was a great video :)!

[@BoostRodeo]

Well if you ever get the itch to supra steering swap a miata, you now know the deets 😆 what's a miata rack ratio anyway like 1.2 lock to lock 🤷‍♂️🤣

[@pistonsoup3749]

@@BoostRodeo I think its like 1.9 or 2.1 or somthing silly hahaha plus a short wheel base

[@BoostRodeo]

@@pistonsoup3749 yep, #gocart status! The evo was 2.3 and felt great on the track. Little unnerving at 150 though and felt like more work on long hwy trips

[@AntonioClaudioMichael]

Great video Ryan

[@jacksonedward7245]

Thank you for the video. I have an 87 mk3 turbo. Is there a combination that works when keeping the 7mgte?

[@BoostRodeo]

With the 7M it should be fairly simple to run either the pps or non pps rack. Just make sure your ps pump has the right pulley. PPS = smaller pulley, NON-PPS = larger pulley

[@AntonioClaudioMichael]

I can attest the loose feeling at slow speeds and stiff steering at 70 with the rack and pinion I have on my 2000 4runner looks just like your new rack in video bro mine is a progressive system 1/4 assist power steering system

[@BoostRodeo]

Toyota definitely re-uses a lot of the same tech in different platforms!

[@AntonioClaudioMichael]

@@BoostRodeo yep

[@traingeek2000]

I've been trying to make it to a junkyard to confirm whether the 98-05 GS300 power steering pump has the PPS solenoid, hopefully there's a USDM option for the Ultimate Steering Combo. I've been meaning to get another rack as well, my '91 PPS rack is leaking plenty. I'll be keeping an eye out for an early rack.

[@BoostRodeo]

Let me know what you find out! I'm not sure where they put the solenoid on the GS

[@traingeek2000]

@@BoostRodeo successful junk run, the 98-05 GS300 does indeed have the PPS solenoid on the pump. Confirmed in the TSRM as well. Good to know it's not exclusive to the Aristo.

[@FiveSeven2JZ]

I'm glad I subscribed. Great content. Keep it up! 👍

[@BoostRodeo]

Thanks for subscribing, really appreciate it! Have a lot more MKIII projects that I am about to start on.

[@ibm_businessman6033]

Dear fucking god thank you for this

[@BoostRodeo]

😆👍

[@Adrian_Supra]

I was able to get a remanufactured rack from o'Reilly's and got a re-manufactured power steering pump from driftmotion. Everything works great but at low rpm's the steering gets a little tough and I have to rev the engine a little and it eases up

[@BoostRodeo]

How did the reman rack look? I had one from eurozone and one from O'Reilly's that I returned because they both looked so bad. I ended up just rebuilding it myself.

[@Adrian_Supra]

It seemed good and has worked well so far

[@CarModsGarage]

good video brother. My mk4 steering is so sharp that it is not very fun in the highway

[@BoostRodeo]

Thanks brother! good to hear from you! might be an issue with the rack& pump you are running. Also the alignment on your front toe in/out can make it feel darty at higher speeds.

[@CarModsGarage]

@@BoostRodeo ya I though about toe. Gotta take to the align shop but don't want them to drive it 😆

[@AntonioClaudioMichael]

Very nice informative video bro

[@BoostRodeo]

Thanks Brother!

[@AntonioClaudioMichael]

@@BoostRodeo no problem bro

[@Shwalker07]

Good information.

[@BoostRodeo]

Thanks, just trying to share all the things I have learned the hard way over the years! 🤣

[@glennsundin8495]

Hey awesome video I have an aristo and I can't get my pps off of my pump any suggestions or help for removal I have a new pump to. Trying to switch it out... I just can't get it off

[@BoostRodeo]

They can be stubborn. Is the pump out of the car?

[@NassersGarage]

I have a non-PPS with the normal JZ pump from a 1jzvvti - what I understood was that this setup with a 6mm spacer is better than a PPS rack with the same pump ? Am I correct ?

[@BoostRodeo]

yes, your rack will already have the same amount of travel as a pps rack. If you add spacers you'll gain another 6mm of travel. To actually use it you will have to remove or modify your steering stops on the lower arm. You have the best setup as far as I am concerned.

[@TJ_337]

is the 89 toyota cressida glx power steering the same rack? it has that solenoid on the rack. I wanna know how to run it.

[@BoostRodeo]

Same power steering system and solenoid, I am not sure the rack is identical and interchangeable though. The solenoid operates at about .5v at full assist (low speed) and tapers off to 0v at higher speeds

[@milbrooke]

Ok where can I get a PPS solenoid ASAP! Everything going well with my rack rebuild, but tested solenoid and only works intermittently. Thank you!!

[@BoostRodeo]

Unfortunately the solenoid was never offered as a standalone part by toyota. Only with the complete steering rack which has been discontinued. The best options for sourcing them now are to watch the forums and facebook groups for a used solenoid or entire rack with a solenoid. The A80/SC300/SC400 racks are different but did use the same solenoid as the A70. Also RHD early Soarers should use the same one. Good luck, I wish I had a better source for you!

[@That2JZ88]

What’s the parts number on Rockauto for the right bellows for a can I get the non PPS rack?

[@Miguelsgarage]

Good info! I wonder if there is a transferable rack from another car that gives you quicker steering? Has anyone tried different ones?

[@BoostRodeo]

Wondering this as well, the z20 soarer pps rack was actually used in rhd EU supras pre 89 so I wonder if there are any other lhd toyota racks that would drop in. Might also be gear sets out of a different housing that could be used in ours for a faster ratio.

[@destruxxx]

Years ago someone figured out that a fox body mustang rack can be made to fit pretty easily but requires custom inner tie rods and steering shaft adapter. About ten years ago a bunch of people on the Supramania forum tried to find another oem Toyota rack that would fit but nobody ever found anything better, IIRC.

[@pimmus18]

Where does the speed signal Come from ? My abs light lights up since the 1jz and r154 swap. Mine is a early '86 with another steering rack, the pps solenoid comes out with another angle.

[@BoostRodeo]

There is a progressive powersteering ecu in the passenger side kick panel. It receives the speed signal from the speedometer (trans output shaft speed) and is not tied into the ABS. Is your car usdm or another market? The US did not have pps in 86.5

[@pimmus18]

@@BoostRodeo thanks, so the abs light could be lighted up since the instrument panel swap 😅 mine is a EU version, had to swap to non pps, because the solenoid hits the crankcase, but with the 1jz ps pump the steering is too light. There is no good steering feedback at higher speed

[@pimmus18]

And the r154 doesnt have a speed sensor. It has a speedo cable

[@BoostRodeo]

@@pimmus18 you are correct on the speed sensor but according to the wiring diagrams the pps ecu gets the signal from the dash. The testing procedure is to jack up the car and check the voltage change with the rear wheels spinning at different speeds so ther must be a signal conversion in the dash. Your pump is overdrive to accommodate the pps dropping pressure. The non pps 7M pumps had a larger pulley to decrease the assist. Your best bet is to switch to a pps power steering pump from an Aristo. The solenoid is on the pump instead of the rack, plugs in with the same 2 wire plug.

[@destruxxx]

Great video. I had no idea about the pulley size thing. I have a 1jz soarer non vvti in my 87 supra. I got the 87 without a pump on it so I couldn't compare it to the new one. Do you know if the larger pulley from the 87 7m pump will fit on the JZ pump? I've had issues with ps fluid and aeration since I built the car, despite replacing the pump and lines and rack and upgrading the cooler. Now I'm realizing it might be because the pump is overdriven. Oh and another consideration on these cars is the factory steering wheel is the size of a bus. A smaller wheel diameter helps a lot with feel and making the slow ratio less obvious.

[@BoostRodeo]

Unfortunately the belts are different between the 7M and JZ so the original pulley will not work. The speed of the pump could be causing the aeration but I would first make sure your reservoir is mounted high enough above the pump to feed enough fluid to it. If you are using a oe reservoir I would also empty it and make sure the screen inside is clear and not slowing the fluid flow. Both those issues are more common. Definitely right on the steering wheel, can make a pretty big difference on both the response and the weight of the steering feel.

[@theowenhensley]

I know this was 3 years ago but I’m trying to track down why my pump screams at me at any speed. New pump, driftmotion pressure hose and all the return hoses are new. Res is clean too. All stock 89+ stuff. Do you think that solenoid is no good?? Losing sleep over this damn thing 😂

[@BoostRodeo]

How well did you bleed the system? getting the air out is really important and can be difficult. Jack the front of the car up and with the engine running turn the wheel lock to lock 20+ times, then check the fluid level. If it dropped at all top it up and repeat. You usually need to do this 2-3 times either letting the car sit or driving in for a bit in between. Air really hides in these systems and finds its way back to the pump until its completely out. If your solenoid is dead it could be making the bleeding process more difficult by restricting flow but I don't see how it would be causing the noise itself. If none of this works you may have just gotten a bad reman pump. It does happen.

[@theowenhensley]

@@BoostRodeo I found the problem! The super long return loop for “cooling” was crushed. Deleted the extra line now it works great!

[@BoostRodeo]

@@theowenhensley Awesome, that will definitely do it. Sorry it took so long to reply, I somehow missed this comment. I'm glad you found the issue though! I swapped that big steel loop for an actual plate cooler on both my cars.

[@theowenhensley]

@@BoostRodeo you reckon it’d do long term harm to it if the loop is just bypassed? I don’t drive mine hard it’s just a touring car for me. Appreciate it man!

[@BoostRodeo]

@@theowenhensley It shouldn't cause any issues at all. The earlier cars didn't even have the 'cooling' loop and it really doesn't do a whole lot. I have a cooler installed because I track mine periodically which creates some heat. Normal driving is fine.

[@sunnykay19]

awwww sheeeeeet Aristo VVTi pump and Non PPS baby. ;) controled by my motec sheeeeeeeeeeeeeeeeeeeet

[@BoostRodeo]

How do you like that setup? Same thing I'm planning to swap to.......on a lesser ecu than a motec though 😄

[@sunnykay19]

@@BoostRodeo gonna do it soon have all the parts on the shelf and was dumbfounded what to do with VVTi PS pump...now i know!!

[@BoostRodeo]

@@sunnykay19 Same here, just need to get some other upgrades out of the way and get to it!

[@chekamofo]

What company did you say made that full kit? I searched "fab performance "

[@crazyinsane135]

Funo auto tuning from poland I believe.

[@sergiobarrientos6311]

Hey friend do you have the part number for a 86.5 na power steering

[@BoostRodeo]

Are you looking for the rack rebuild kit part number? should be gates pn: 350950. The Toyota kit has been discontinued but was 04445-24020

[@dickhead2285]

Aye sick video man, heaps informative im tossing up whether to pull the whole ps system out of my a80 or just do a proper flush, i dont get a heavy steering wheel at speed though, do you reckon if i replace the solenoid that will fix the problem?

[@BoostRodeo]

I would start with a flush, especially the reservoir and then bench test to make sure the solenoid is working. If it is I would next check that the pps ecu is throwing a signal with a multi meter and go from there.

[@danc5963]

changed the pump but my steering is still very stiff and the fluid doesnt circulate through the resevoir any advice ? thanks @@BoostRodeo

[@edmondhashem4854]

I still have the stock 7mgte in my car and my car is an 87 so it doesn’t have the PPS in it so what would you recommend? Would the jz pump fit on the 7m? If so, how would I wire it in?

[@BoostRodeo]

The JZ pump wont bolt to the 7m unfortunately. Also you would have to find a pps ecu and wire that into the car as yours won't be equipped with it. I probably wouldn't go through the trouble just to add it.

[@ankomitarashi7083]

That damper looks the same as my 7M cressida, anybody know where I can find one?!?

[@BoostRodeo]

It's likely the same. Toyota uses a lot of the exact same racks in different models or even same parts in different racks. Unfortunately you can't get that damper from Toyota any longer. I have yet to see an aftermarket one listed as a replacement but I would guess that if you looked at the lengths on aftermarket dampers you could find one that could be made to fit.

[@sunnyblumen5406]

Any chance you could provide a link for compatible spacers?

[@sunnyblumen5406]

Oh my just looked at the process to do this and maybe I'll hold off and go with the APZ kit first lol

[@sunnyblumen5406]

www.supramania.com/forum/threads/steering-rack-spacer-question.106777/

[@BoostRodeo]

Added a links to Driftmotion and Agile Performance in the video description. They both make them and are companies supporting the MKIII by makeing awesome parts.

[@sayyidali582]

Hey man, is there any way to delete the pps solenoid from the rack or 'bypass'? I happen to have an aristo engine in my Japan spec Ga70. Bare bones no wires atm. I will be rewiring the car and using haltech. I just saw a vid where the solenoid can be bypassed on the aristo pump, but the issue of no oem electrics to control the rack. So i was wondering if there is a way to bypass the solenoid on the pps rack. Or attempt to rebuild the really old beat up non pps rack I happen to have in the shed

[@BoostRodeo]

I have not seen a delete for the solenoid on the rack but if you could find a plug with the same threads as the pps solenoid that would remove it. I plan to rebuild and swap the non-pps rack into my car.

[@sayyidali582]

i brutalized an old solenoid and made a plug with it today. im actually waiting on a buddy to finish wire his mk3 to start and test this solenoid delete.. but on inspection of the valve body on the rack, it should cause no issues. the actual feel, well only when we get the test done then we will know. But yes, he could not get his power steering to be soft. 2jzgte vvti, non pps pump but pps rack. his is a ma70 with a used jza70 steering rack. so like me no useful oem electronics to get this working.

[@sayyidali582]

Just to note, another buddy's car, Rx80 cressida, 1jzgte vvti swap, pps rack and hard steering also. It was the details of your vid here that highlighted these issues and opened up brainstorming to get it to work.

[@sayyidali582]

Another question: so pps and non pps rack ratios are different but travel is the same correct ? Is it that the rack shafts have different teeth design or only the pinion varies? From what I can see, the pinions of both types of racks bolting are the same. Question is if i can put a non pps pinion on a pps rack? What blasphemy would that combination bring?

[@BoostRodeo]

@@sayyidali582 the non pps actually has a bit more travel as well. In a stock car both will be limited by the stops on the lower arms so you wouldn't notice it. Bit in theory you could get a bit more angle with the non pps if you cut the stops off. As for why the difference in ratio and travel I cant say. I haven't had the 2 racks apart side by side ever. I may try to verify when I rebuild the non pps rack I have

[@AntonioClaudioMichael]

I hate the progressive power steering it dosen't assist crap compared to my 2005 Ford excursion full assist steering and even my 2020 Ford f450 full assist power steering kinda with my 4runner didn't have assist or power steering at all steering is already set up that I have to use muscle to turn the 4tunner would prefer assist not to be there i like the heavy you have to use your muscles steering

[@BoostRodeo]

I really like the progressive setup in the Supra when it's working right. Easy enough to turn at a stop or when backing out slow but firms up a lot when you hit cruising speeds.

[@AntonioClaudioMichael]

@@BoostRodeo probably works a ton better in the supra

[@BoostRodeo]

@@AntonioClaudioMichael must if yours is that bad. Different vehicle weight and tires size along with a lot of other things could affect it.

[@AntonioClaudioMichael]

@@BoostRodeo yeah truck is 8000 pounds had 265 75 r16 rims and tires alot of offroad add ons and upgrades

[@josephsupersport9451]

I have a mk3 supra and i bought it without a title while applying for it i got a letter sent back saying the car is accually a 89 but i put 88 since on the door jam it says 8/88 so do I have the no pps or with pps car?

[@BoostRodeo]

so 8/88 is the production month/year. US 89 cars would be built in 88 and sold in 89. The answer is your car could have either. 89 was a transition year and early cars have early square motor mount subframes, yellow plug engine harnesses and no pps where later cars have round motor mound subframes, grey plug harnesses and pps. Being August of 88 I would guess your car has it but the only way to be positive is to look at your rack and see if it has the solenoid.

[@josephsupersport9451]

@@BoostRodeo Thank man your the best i appreciate the info

[@BoostRodeo]

@@josephsupersport9451 Happy to help wherever I can!

[@AntonioClaudioMichael]

Toyota dont change things like rack and pinions and even suspension very much most vehicles from 80s to 2010 are interchangeable for alot of different parts not just racks not all vehicles but some

[@BoostRodeo]

They are the best at being efficient with their designs and leveraging any parts they can across models 👌

[@nerfkhat]

i have a 90 turbo and it has the older style non progressive ..maybe your wrong about the years?

[@BoostRodeo]

Did yours have the steering damper? There are non progressive power steering cars post 90 but they were not very common and the rack style should have changed slightly.