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If you do have a username there ask if there is some sort of extra accumulator or something.
Trying this will take some thinking. Remove the pistons from the pump. plug the line o and from the hydraulic servo. Mount vacuum servo. Some plumbing.
Where would a good source for vacuum be?
If it turns out that this works really really well I'll fit the pump..just to see if it gets better.
Andrius - PPP (Post Pic Please!)
Just checked "My Pictures" and found a 80 GTE Q with a 10Valve turbo. It's got a turbo engine and vacuum servo.
i have a username there, if you didn't notice it's the same one i have here. I owned 2 GC8 Impreza WRX's (older body style, not bugeye) so i'm familiar the cars, i just never thought about this until buying my 1992 S4.
regarding your install procedure, is it possible to just use a hydraulic pump from a different car, rather than modify the stock unit? There are a quite a few cars that used the inline-5 w/o turbo from which a pump could certainly be made to fit.
When you say hydraulic servo, are you referring to the "bomb" (accumulator formally)? Or is this a different part?
Is Audi using the term "servo" specific to their vehicles because I'm sure it's nothing like the servos i use in my radio control cars.
Anyway, I really want this to work out for you, because really it's a pretty cheap project and it will definitely simplify these cars.
Yes, my aim was to use the pump from a A4. Seems that the standard powersteering pump from a Audi 80 is rated at 75bar while the S2 is rated at 100bar. For the A4 a number of different ratings are avaliable and there is one that's 100bar.
The term servo is something that is swenglish - it's called servo in swedish but it's also a word used in english. Now when I said vacuum servo unit i referred to the large black cookie jar that you bolt the master cyl to. With hydraulic servo I meant the corresponding hydraulic-thingy. I'll try to clean my act up!
I haven't phoned the guy yet but I'll do it during the day. I'll try to negotiate the price a bit more and get him to toss in the steering pump as well... We'll see.
I was looking at my engine today and noticed I have no servo behind my master cylinder. is this normal? it didn't seem as though there was space to fit a vacuum servo or brake booster as it is properly called.
also it could be possible to lower the steering assist by using a 75 BAR pump instead of 100.
I know many people who run boost and the vacumn booster. I've got a coupe quattro 20vT that I am building and have converted to a vacumn booster. I bought a brand new vacumn booster online for $100.00.
Your going to need to modify the power steering lines too. Your also going to have to make a custom power steering bracket setup to work with the non hydraulic brake power steering pump.
It's not the easiest of swaps. To get at the clevis setup under the dash is not the easiest things in the world. It's doable but just as much as a headache of lets say.. replacing the heater core in the dash?
Check vavle is definately necessary.
You can source a vacumn canister if it troubles you through places like: www.jegs.com and www.summitracing.com here in the states. They are meant for high cam applications but will work for the same application.
ttyl
Josh
I chose not to choose life: I chose something else. And the reasons? There are no reasons. Who need reasons when you've got quattro?
what is the clevis setup under the dash, you mean the brake linkage? what does modifying the powersteering lines entail? don't i just need to remove the extraneous parts and fabricate a bracket to mount he power steering only pump.
Hey Josh you are going to have to explain that again to me as I can't see how it could be that much work. I mean, the 2.8's have a vacuum servo and share the rest of the parts from the brakes with the S2. Also as I was going to use a A4 pump there would be no need to make a bracket. By using the A4 pump I probably won't need cusom lines either. I could be wrong here but this is as far as my research has taken me. What's this about changing the heater core? Why?
In response to the heater core. It was a comparison to the difficultly aspect of the swap. It's actually more difficult than the heater core swap because it has custom parts that are necessary.
The Brake hydraulic fluid is the same as the power steering fluid. The Brake hydraulic fluid uses the same resivor as the powersteering setup. So the return line to the power steering pump has two fittings that are no longer needed. Why? Because if you delete the hydraulic setup you also have to delete the brake bomb.
The Power steering pump on the 20vT engines has different mounting points than the non turbo setups. One bolt position is shared why two of them are not shared with the non hydraulic power steering pump.
To remove the hydraulic brake setup you have to disconnect the clevis lever that is attaches to the brake pedal. It's not that easy to get to that area. You may have to pull the dash, and you might want to pull the front driver seat.
The vacumn servo is rather large and it's not easy to get the engine harness around it.
It's not that easy as it appears.
Thats it.
cheers
Josh
I chose not to choose life: I chose something else. And the reasons? There are no reasons. Who need reasons when you've got quattro?
i agree, it's probably much easier to do if you're doing an engine swap already. from the looks of my S4 engine bay, i still can't figure how a vaccum booster would fit in there, but then again the 100CS has a vaccum booster.
i just don't see why its so complex to remove the parts that are not needed. I would just remove all the old lines, and have new ones made.
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