HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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Plumbing hydroboost w/ manual steering

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Plumbing hydroboost w/ manual steering

Post  948inVA on Sat Jul 21, 2012 3:36 pm

Has anyone installed the ford hydroboost with manual steering? I'm trying to figure out how to plumb the high pressure output from the HB that normally goes to the rack.
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HB without PS

Post  fliermike45 on Sat Jul 21, 2012 7:19 pm

I'm not an expert but having installed a HB with PS I would imagine that you will have to install some kind of unit that mimic's the pressure drop in the PS rack, some kind of regulator.

The third low pressure line on the HB unit should T into the low pressure side of the above regulator device and then go to the PS pump reservoir low pressure return line.

My 2 cents worth.

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Re: Plumbing hydroboost w/ manual steering

Post  948inVA on Sun Jul 22, 2012 10:54 am

That is what I was thinking Mike, I read someone mention a restrictor fitting but was hoping to get more details on that or a part number.

Also, for the front brake lines I was going to run them to a tee and then use a M10 -> M12 adapter to mate to the mustang prop. valve. Were you able to find a tee with the 10mm ports or did you just convert the lines to 3/16"? I haven't had much luck finding a metric tee.
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Front brakes

Post  fliermike45 on Sun Jul 22, 2012 2:33 pm

I used a brass metric Tee, I think I got it from Autozone. If not search on line.

Tee can be seen in this pic.

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Here you go

Post  fliermike45 on Sun Jul 22, 2012 2:36 pm

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Re: Plumbing hydroboost w/ manual steering

Post  87-944S on Sun Jul 22, 2012 2:42 pm

Any advantage to using the Mustang HB versus BMW HB? It looks shorter than the BMW unit.
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Re: Plumbing hydroboost w/ manual steering

Post  948inVA on Sun Jul 22, 2012 3:21 pm

Great.. thanks for the link. Anyone have a suggestion for the restrictor / regulator needed on the high pressure line?
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Ford v. BMW

Post  fliermike45 on Sun Jul 22, 2012 4:08 pm

I believe the BMW has a separate backup reservoir, Mustang is built in.
Perhaps a BMW user can chime in.

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Re: Plumbing hydroboost w/ manual steering

Post  docwyte on Sun Jul 22, 2012 5:07 pm

BMW HB lets you reuse the stock 951 master cylinder so your brake bias stays normal. With the Mustang one you have to use the Mustang master cylinder and run an adjustable rear brake proportioning valve if you track the car...

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Re: Plumbing hydroboost w/ manual steering

Post  948inVA on Mon Jul 23, 2012 4:53 pm

OK, found some more info on the web. Some have stated that the High Pressure out line from the hydroboost to steering rack (port 2 -> port 5) is under no/minimal pressure when the wheels are straight. In other words, it is basically a low pressure line until the steering rack is turned, at which point the rack creates a restriction and pressurizes the line. If you cut the rack out of the system, there is nothing to pressurize that line. Based on this, I can't see why you would need a restrictor or regulator between the high pressure out and the reservoir. I should be able to just tee this line into the low pressure return to the reservoir.

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Another possibility.

Post  fliermike45 on Mon Jul 23, 2012 5:29 pm

Is it possible to block off the "high pressure" out port on the HB? Fluid return to the pump/reservoir would be via the low pressure line.
Must be a HB expert somewhere.

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Re: Plumbing hydroboost w/ manual steering

Post  leadfoot on Wed Dec 18, 2013 7:49 pm

Hi,
After searching and searching I can't find any conclusive information about running of lines for a manual steering rack / hydroboost setup. I'll be the first to admit brakes aren't my strong suit... but the last thing I want to do is get it wrong...
I have a 1981 924 turbo with LS1 engine conversion;
GM P.S pump/res
GM PAS ,electronic power assist variable setup , stock manual rack
upgraded 4 pot brakes front / stock single pot rears.
stock 23mm brake master cylinder

I have these questions please if some one can help,
if I route the high pressure line design to go to rack through a cooler would this be enough of a drop or would a restrictor be required ? would it be better to run the restrictor pre cooler and any suggestions on size of the restrictor.
Or can I just block the rack outlet port and run the cooler pre hydroboost? Would a cooler even required? The car is going to be street driven but amongst some knarly hills, So overkill is ok too...
When people mention the mustang unit has more bias to the rears, is this because the mustangs ran bigger brakes in the back?
Can I used the stock M.C from a 931 on the BMW unit? or is there difference to the 944 unit?

I know, alot of questions, thanks if you can enlighten me,
regards
Stu



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Re: Plumbing hydroboost w/ manual steering

Post  948inVA on Thu Dec 19, 2013 4:58 pm

I've been running with this setup for over a year now.. no issues at all and lots of stopping power. Manual rack with Mustang hydroboost master cylinder and proportioning valve, GTO PS pump. I'm not using a restrictor or a PS cooler, and just street driving. Take the above diagram from the 04 mustang and just bypass the steering rack, that's how I routed it.
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Re: Plumbing hydroboost w/ manual steering

Post  leadfoot on Thu Dec 19, 2013 6:24 pm

Legend,
Thx mate, was hoping it was that easy,
Stu

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