The Tips and Tricks thread

[George]

Pumps create pressure not flow
that's exactly why I do need higher pressure part. My car uses steering machine which needs more pressure than a rack does. I've seen a couple 3RZ conversions into cars with steering machines, they used USDM Toyota T100 pumps with no modifications. I thought maybe there're direct replacement pumps available for the JZ, too. Currently I use ZF pump off some Audi as temporary solution

As for pressure/flow thing, vane pumps for power steering have builtin bypass valve. The thing that matters is when it goes open.

[dnegative]

Whoops, other way around. Pumps create flow not pressure

If you cant get your current pump to flow enough @ xx psi then need a bigger pump. Look for doner vehicles that run big PS racks or perhaps fiddle with the relief valve if you can.

[George]

I couldn't find appropriate JDM donor so far (that's why I asked here if there're any options), ended up with European make...but can't find one in decent condition. The part I currently run produces nasty whining above 2000rpm. In all other aspects it's fine enough though.

[sc400]

have you looked at going to a electric pump?

[George]

Not really, can you name a decent donor for that? Would be great to have progressive steering based on that, n/p to design and implement custom electronic control module.

[TERRA Operative]

Grab one from an MR2 maybe?

[George]

Which one exactly? A brief look at AW11 (4age) didn't reveal electric power steering pump, maybe I did something wrong
edit: ok, it's 44310-17010, will have a look at local importers
p/s dead search everywhere. Looks like a very rare part. Besides I don't think MR2 runs high flow/pressure since the size of the car and its rack in particular

[sc400]

google is your special friend (just got to know how to touch it) but i found

http://www.evsource.com/tls_steering.php

http://www.hydrive.com.au/site/product-io.html

http://www.splitez.com/hydraulic_DC_Pump.html

it would help to know what it's for but this should get you started

[George]

sc400, I consider availability as decisive factor. I don't stick with electric pumps but rather consider them as a good possible choice. The two main criteria are that part should be used JDM one. Otherwise delivery will boost the price enormously. At least for me. So this time google won't help much.

[greywolf]

Would fitting a smaller pulley to the pump count be beyond scope ?

Smaller pulley on the standard pump would mean more revolutions which would mean more psi ? I'm a completely engineering newbie, but thought I'd throw the idea into the hat.

[George]

No that won't help as these pumps have bypass valve built in. Guys, the pump is not a vital problem for me, I was just wondering if there's a nice replacement widely known which I occasionally don't know yet. If not, I still have plenty of options.

[BLSTIC]

Here's one for you that I have used in speedway:

Old original equipment McPherson struts are occasionally able to be disassembled. They can then be cleaned and re-filled with oil. Of any grade. Ordinary engine oil in a worn out shock makes a stiff shock on a very limited budget.

Also with some imagination, the same shocks can be modified to alter the valving. Normally these shocks only have valves that restrict extension, but through a combination of modifying the valving and different oils you can achieve almost the same resistance in both directions.

Also on the subject of McPherson struts, when using an aftermarket sealed insert put half a cup of auto transmission fluid in the bottom of the (clean) strut. When the insert is inserted, the oil will be displaced up the side of the strut almost to the top. This increases the heat transfer from the new damper to the outer case a LOT and keeps the important bits cooler.

[andrew_mx83]

Nice one. So thicker oil = stiffer?
How does it affect the longevity?



+rep

[BLSTIC]

I can't comment on longevity of new oil in worn struts in a road vehicle but in the first (and longest suffering) speedway car I have seen this done to it lasted two seasons until we sold it.

Longevity gain of oil around replacement inserts? Again I can't quantify. But remember that dampers convert movement to heat, and heat kills oil, and seals, and metal...

Yes thicker oil = stiffer dampers

[andrew_mx83]

Hmm food for thought, thanks.

Usually i keep the big bar as a level/drift/attitude adjusting bar and bin the rest, i might have to pay more attention next time.