Hydro Boost Brake/Power Steering Setup?

[Csmitho777]

• After doing some searching and talking with DriftHQ about a Chase bay brake setup. I am looking into doing some track time through BMWCCA and I also have a local drift oval down the street from my house. I would like to add power steering (with a cooler) and a hydro boost brake setup into my E30. Here is a currently list of how the car is setup. Do we still think the E23 booster is the best setup? I haver a Aerostar van Hydro Boost brake setup in my 72 Bronco and it has the best brakes of any car I own. Any help would be greatly appreciated!
  
  Thanks guys,
  
  --Colin
  
  1989 BMW 325is Cirrus Blue
  Street legal track setup, Clean Title
  Manual sunroof, completely rust free shell
  200k+ on chassis
  
  Drivetrain
  S52 engine w/ zf transmission, 120K (?)
  OBD 1 intake, S52 headers
  2.5" Flowmaster catless race exhaust
  EconoMotorsports oil cooler and gauge plate
  Oil Pressure and Oil Temperature gauges mounted on driver A pillar
  Mishimoto Aluminum Radiator w/Spal electric fan
  Conforti Tune
  JB Lightweight Aluminum flywheel
  Solid engine and transmission mounts
  3.25 MCoupe diff W/ finned cover
  
  Suspension
  Ireland Engineering adjustable rear subframe w/ urethane bushings
  Bilstein Coil Overs
  Springs 350 # front 550 # rear
  Z3 1.9 quick ratio steering rack
  Treehouse front control arm lollypop bushings
  
  Brakes
  Front: Massive Big Brake Kit, Wilwood Superlite calipers w/ Hawk DTC 60 pads
  Rear: Stock calipers w/Hawk HP race pads
  Massive booster delete
  e32 27mm master cylinder
  Stainless Steel lines front and rear
  
  Interior
  Full interior sans rear seat, and carpet
  TC Kline bolt-in 1/2 cage
  Sparco Evo 2 Plus Seats
  Momo steering wheel
  Shroth 5 point harnesses (Expired)
  Factory heater core still installed
  

  ---

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[hoveringuy]

You already have the Massive booster delete, which is what I have. If it's setup correctly you shouldn't feel like you need hydroboost. I did find that was trying to move more fluid than my ABS could handle and after I removed that braking improved significantly.

I am working on a TRW hydro-electric power steering conversion, similar to what the Porsche guys do for track cars. Pump unit will sit in the trunk. Advantage is that no cooler required, my PS fluid temps were initially getting up to 300 degrees before I dropped the pressure and volume.

[Csmitho777]

Thank you, could you tell me a little more about your build?

[jbontke]

I am working on a TRW hydro-electric power steering conversion, similar to what the Porsche guys do for track cars. Pump unit will sit in the trunk. Advantage is that no cooler required, my PS fluid temps were initially getting up to 300 degrees before I dropped the pressure and volume.

Why not go with electric power steering? Like a prius unit?

[hoveringuy]

Why not go with electric power steering? Like a prius unit?

It would certainly turn the wheels, but there must be a reason all the Porsche Cup cars use the hydro-electric pump setup, and everyone hates the 991 electric vis-a-vis Prius steering.

https://www.youtube.com/watch?v=A5HOK8AfAnQ

The Volvo TRW unit is basically the exact same thing but there's hacks to make it speed sensitive. Bruno has a version that's just a "dial-a-assist" knob and another that's
speed sensitive.

https://www.brunosteering.com/product/volvo-hydraulic-electric-power-steering-controller-kit-volvo-c30-c70-s40-v50/

cool stuff!

[jbontke]

I am not sure why Porsche people don't like it. Maybe the 991 electric unit provides too much assist? Or its completely wireless?

I have a prius PS unit but I have not had the time to set it up in my e30 yet. With the unit powered off, it's as if nothing is there, you get a 1:1 feel. Applying power the unit provides steering assist. from what I read, the box provides a flat rate of assist. It's been a minute since I read up on this, but I believe someone had a unit that could adjust the amount of assist with a dial. I want to get rid the need for power steering fluid altogether.

https://www.motortrend.com/how-to/150-electric-power-steering-junkyard-prius-delivers/

https://www.thedrive.com/news/41845/toyota-prius-power-steering-works-in-almost-any-project-car

[hoveringuy]

There are already kits for the Prius rack in the e30. Looks like some basic fabricating to fit it. I'd love to get some feedback on how that actually works in real life; I have great confidence that it turns the wheels, but how would it feel? Does the rack input pinion need to be welded since the hydraulic functions are gone? Otherwise, it would be quiet and completely eliminate hydraulics. I'm haven't written this approach off yet.

I actually found an example that shows the Volvo pump. https://www.facebook.com/Sicknsidewa...7481790373092/ Advantage is that it would have 100% stock feel and you could even adjust the feel to be speed sensitive or not. Disadvantage is that lines need to be run and it takes up some trunk space (but I would recess mine into the trunk floor).

[jbontke]

Does the rack input pinion need to be welded since the hydraulic functions are gone? Otherwise, it would be quiet and completely eliminate hydraulics. I'm haven't written this approach off yet.

The Z4 rack is a manual rack (direct fit), I planned on using this if I ever get around to it.