E23 Hydroboost install

[frantic]

I'm just starting to swap an S54 into my e30 touring. I'm working out Brake Booster clearance issues before I fit the motor in and I'm thinking the E23 Hydroboost will be the best route to go with, as it's a RHD.

What are the critical parts I needs? I've had a read on some threads here but nothing goes into much detail and the pictures are gone.



From the above, All I would think I need is;
Hydroboost booster
Accumulator (Bomb)

I will get the lines made up to fit, Do I just use the same e36 PS reservoir I currently have?

If it matters, I am using an e36 PS pump, Z3 rack and have a 750iL MC.

[jink0619]

the remote reservoir from a 2002 would work great

[flyboyx]

i think you are referring to my thread in the diy section. the pics are indeed gone unfortunately.

so.....you should be just fine with the pump you have but neither a 2002 nor the e36 reservoir will work for very well. the best choice would be the one from the e23. there are about 4 hoses that all return to the stock 7 series reservoir and this is the only one i know of that has the orifices for this.

the problem is that the 7 reservoir is pretty big and quite tall. you will need to find a good place to mount it. i would mount all my power steering components and then figure out what your hose lengths/routing will be.

[iceman]

It's not that hard. Just get in there and figure it out. Most local shops can make custom power steering lines if you need a special length. You need every part in the diagram for it to work, in including the nitrogen canister/bomb.

Have you ever used a hydroboost before? It's kind of a slow and clunky braking system that might not compliment your s54. It might be better to stick with air r boost or a mechanical leverage system.

[jink0619]

i thought of using the 7series booster with 2002 remote reservoir but it would have to be mounted where drivers headlight is, your case it be passenger. But then it's in the way of the intake so I had to reconsider. Best option with good braking would be a 944 booster, you'll have to cut the manifold and reseal, 2nd is a 2002 booster which is what I did, decent braking, fits without any modifications and uses stock MC, last would be boosterless ewww and with the right setup could be costly.

You can use both PS pump, e36 or e46m, and same goes for PS reservoir

[frantic]

Brakes wise I have a UUC BBK, And UUC slotted discs in the rear. I currently have a MK2 Golfbooster installed, as previously I had a M52B28 swapped in it.

I considered modifying the airbox but wasn't sure if I'd be able to bandage it up again myself.

I also considered a 2002Tii booster, but they are quite hard to find and I thought it may be end up being rock solid with a 750 MC.

Lines are fine, I can sort those I just wanted to know what are the major parts I need for the system - Now pointed out I also need the correct reservoir which makes sense. And I can also retain the S54 PS Pump if I get all the lines made up again.

Anyone have a diagram of how it all fits together WITH power steering? I haven't even bought a hydroboost setup yet, Yet to source one!

[jink0619]

You can reuse the e30 PS lines, mount where u want the reservoir to be and cut lines to fit. The only line you need to get is the one from Rack to Pump on the drawing it's the one with banjos on each end, it's from an e36 328i

[frantic]

Yeah I already have that, I've got all e36 328 PS lines currently as I have a z3 rack and it used to have an M52B28 and M52 PS Pump so used the e36 lines.

Just wanting to know how it connects with hydroboost, Like does the PS high pressure line need to feed straight to the Accumulator, then from there it branches of to the Hydrobooster and PS rack? Then each runs a return line to the reservoir, and then one more fitting rom reservoir to feed the pump?

[flyboyx]

Have you ever used a hydroboost before? It's kind of a slow and clunky braking system that might not compliment your s54. It might be better to stick with air r boost or a mechanical leverage system.

i have used the hydroboost for some time and my experience is completely different than what you suggest. i think it provides great if not better stopping power and is just as fast or faster than vacuum style. the pedal is rock solid and pretty close to the top of its travel. i think my booster came from an e23 because about 1/3 of it was inside the firewall making the apparatus shorter inside the engine compartment.

i made my own custom lines. i went to a web site called discount hydraulics to buy new hose and crush fittings. it was stupid cheap. i think less than 30 bucks for 2x the hose i needed and about 12 couplings. i reused the hose ends(banjos) from the hydroboost hoses and also from a few e30 pressure hoses i had laying around. my local napa store has a hydraulic fitting crimper. i just walk in with my hose assembly, and ask if they don't mind if i go in the back and crimp them myself. they never seem to care. i tack welded the crush couplings to the fitting ends just to keep them from blowing out under high pressure.

[DesktopDave]

I think this is potentially a great idea. I always liked the feel of the hydro in my E23 and E24. Better yet it's very compact where it counts compared to the vac boosters. It has a very solid feel, very direct. It is slightly slower to react as mentioned...especially when the accumulator reservoir develops the inevitable pressure leak...

Also be aware that the P/S pump is different. It's slightly larger than the stock pump and has two outputs. The first stage is exactly the same as a conventional P/S pump, sends pressure off to the steering box. IIRC the second stage steps up pressure for the regulator body/accumulator, which then feeds the booster. Spent fluid returns from both steering and brake boosters back to the large stock reservoir. Total capacity is something like three liters.

The stock E30 P/S pump cannot likely feed the high pressure side, but the brackets may be interchangeable or modified to suit. AFAIK the hydroboost was never fitted to an M20. Our E28/M20 cars got the vac booster instead. I think the system was also installed on some M70 cars.

Also don't forget the electrical pressure switches - they're prone to leaking but they are a very wise safety system. The hydrobooster is otherwise fully mechanical from what I've seen. Don't discount the possibility of sourcing a Citroen or GM hydro system either. They're all very similar in design and function.

Count me in for some Kiwi ingenuity...I have a spare setup off a Euro E24 if you need some photos, measurements, part numbers etc..

[DesktopDave]

i have used the hydroboost for some time and my experience is completely different than what you suggest.

Pics? Please?

[iceman]

i have used the hydroboost for some time and my experience is completely different than what you suggest. i think it provides great if not better stopping power and is just as fast or faster than vacuum style. the pedal is rock solid and pretty close to the top of its travel. i think my booster came from an e23 because about 1/3 of it was inside the firewall making the apparatus shorter inside the engine compartment.

i made my own custom lines. i went to a web site called discount hydraulics to buy new hose and crush fittings. it was stupid cheap. i think less than 30 bucks for 2x the hose i needed and about 12 couplings. i reused the hose ends(banjos) from the hydroboost hoses and also from a few e30 pressure hoses i had laying around. my local napa store has a hydraulic fitting crimper. i just walk in with my hose assembly, and ask if they don't mind if i go in the back and crimp them myself. they never seem to care. i tack welded the crush couplings to the fitting ends just to keep them from blowing out under high pressure.

You probably have a well maintained hydroboost then. Glad to hear. The one I drove must of had issues.


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[Wanganstyle]

Also be aware that the P/S pump is different. It's slightly larger than the stock pump and has two outputs. The first stage is exactly the same as a conventional P/S pump, sends pressure off to the steering box. IIRC the second stage steps up pressure for the regulator body/accumulator, which then feeds the booster. Spent fluid returns from both steering and brake boosters back to the large stock reservoir. Total capacity is something like three liters.

for S54 + hydroboost the PS pump from E34 525iT touring might be the ticket as it has pressure out for the rear self leveling suspension

M50 family alternator, AC, ps will bolt to the S54

[Andrew325is]

Have you ever used a hydroboost before? It's kind of a slow and clunky braking system that might not compliment your s54. It might be better to stick with air r boost or a mechanical leverage system.

i have used the hydroboost for some time and my experience is completely different than what you suggest. i think it provides great if not better stopping power and is just as fast or faster than vacuum style. the pedal is rock solid and pretty close to the top of its travel.

I agree. Hydroboost performance is great as it was designed for much larger cars that require more stopping power. Just make sure the seals don't leak and you should be good to go.

[The Dark Side of Will]

Don't discount the possibility of sourcing a Citroen or GM hydro system either. They're all very similar in design and function.

The US systems used by GM, Ford and Dodge are typically used in trucks and vans and are much bulkier and heavier than the ZF units, in addition to having integral accumulators. They probably wouldn't fit a swapped E30.