Power steering power issues

[Slick67]

So-
Ever since the trans was swapped from c4 to zf5, the power assist goes away fully, to the steering- as soon as you hit idle.

Obviously, this is a PITA, being that you push the clutch and the motor idles…. and no steering.

As soon as you get 1 rpm you have full power back to the wheel. It’s on its 3rd or 4th pump swap to rule out a ban reman on the 1st 2 and a lemon on the 1st new 1 …

MY THEORY FOR A FIX- would be to mill a smaller pulley for the pump so, at idle, it spins, just a smidge faster.

Ideas, thoughts

FYI- it’s just your run of the mill 67 with 351 and 34-12.5, 15’s

 

[1969]

What power steering pump are you running?

 

[SteveL]

I'm assuming you already have a Saginaw pump. The options I came up with are
1) there is a smaller diameter pulley(I think early corvette) you can machine to fit the press on shaft.
2) another option is swapping the pump to a keyed pulley shaft and march offers a Purdy aluminum one.

 

[.94 OR]

3) bump up your idle slightly?

 

[Broncobowsher]

Post a pic of you pulley setup. Just want to make sure someone didn't do an underdrive crank pulley or something else odd.

What do you idle at?

 

[Timmy390]

3) bump up your idle slightly?

This...How low is your idle

Tim

 

[Slick67]

Saginaw pump

Idle is where it should be

And rig is in storage atm so can’t take a pic

 

[Slick67]

Ps-
Thx for the input

 

[DirtDonk]

Idle is where it should be

What does that mean?
What is your idle speed exactly?
And can you tell whether or not it drops below idle for a moment, when you let off the gas?

 

[Slick67]

What does that mean?
What is your idle speed exactly?
And can you tell whether or not it drops below idle for a moment, when you let off the gas?

Can’t answer exactly.

It idles fine, slower and it would blip and stall. Faster and it would be more at a rev.

It is in storage so it’s nothing I can give an exact numeric value to.

When the clutch is pressed and you let off the gas, it goes to normal idle. *barring some abnormal event.

I’m baffled by it not occurring with the c4. And also that the slightest rev gets the power back.

Of all posts- I think the corvette pulley mod sounds like the most promising mod.


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[DirtDonk]

Thanks. Don’t remember what you have, even though I’m sure we’ve spoken about it before. But are you running a carburetor or fuel injection?
And did you change anything on it when you got rid of the automatic transmission? Obviously it had a kickdown lever, or should have. Did you remove that completely?

 

[Slick67]

Carb, yes.

I didn’t pull the c4 myself…. So I’m not sure what was changed aside from the transmissions, and such. And without looking, I’m not sure about the kick down.


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