Frustrating can't find right thread pitch

[XLexusTech]

Anyone know the thread pitch for a c4 c5 corvette steering rack? Pressure and return?
i can tell you M16 1.5 and m 18 1.5 is not the right thread ...

Low and behold it's a Ford rack in my Ch envy

[raustinss]

Thread pitch gauge ..? .... Could be fine thread metric too

[XLexusTech]

Thread pitch gauge ..? .... Could be fine thread metric too

Yeah I can't find my kit but I am looking turns out I have a Ford rack... now I have to figure out if it's mustang 2 SAE threads or 84 to 97 which is metric... then figure out the fight Oring .... if anyone here has a JRS setup and has been down this road please post

[randy]

Thought you had a dse rack?

[XLexusTech]

Thought you had a dse rack?

I thought my entire setup was based off a corvette ... turns out the mustang rack has really convienant mounting boss s built in so builders use them frequently.....

M 14 m16 X 1.5 fit although the M16 threads on the rack need some love appear to be munged up, prob from overt tightening prior to me getting it

[XLexusTech]

Ordered.. now sine all my research yielded more issues .. I need to figure out if I need a pressure reducer .... :bang:

[XLexusTech]

So I read about 20 threads on this subject anyone know if this will work with the vintage air ps pump?

https://www.summitracing.com/parts/bsp-rp1300/overview/

[XLexusTech]

Ordered an inline adjustable https://www.summitracing.com/parts/hdt-ps-101

[dontlifttoshift]

Cancel the order for the Heidts valve. It doesn't work and adds 8 more potential leaks. The flow control valve you pictured earlier is the right answer.

You want to limit volume, not pressure. The adjustable valve just bleeds pressure into the return hose and by the time you turn it down enough, you will have little assist at slow speeds.

The MII rack wants about 2 gpm and most GM pumps are 3 or more. The flow valves are just a fixed orifice of differing sizes. The 2 gpm has a smaller hole than the 3gpm.

[XLexusTech]

Cancel the order for the Heidts valve. It doesn't work and adds 8 more potential leaks. The flow control valve you pictured earlier is the right answer.

You want to limit volume, not pressure. The adjustable valve just bleeds pressure into the return hose and by the time you turn it down enough, you will have little assist at slow speeds.

The MII rack wants about 2 gpm and most GM pumps are 3 or more. The flow valves are just a fixed orifice of differing sizes. The 2 gpm has a smaller hole than the 3gpm.

Thanks for the heads up researching now since the part shipped... I called summit to ask about the valve and they sold me the hedits one

[Ron in SoCal]

Call AGR. They have the reducer you need.

[XLexusTech]

Call AGR. They have the reducer you need.

Thanks Ron just ordered the billett Specialties one... we live we learn :-)

[David Pozzi]

The outlet fitting reduces flow, which affects steering feel. You also need to re-shim the pressure valve just behind the fitting.
Modern saginaw pumps don't come with a shimmed valve anymore. The factory screws the "nut" down, - not all the way, - and uses Loctite on the threads to hold it there. You can buy a shim kit and select a shim stack to limit pressure using the chart they supply. The goal here is to protect the rack from excessive pressure. You want around 1100 to 1200 psi.
https://www.summitracing.com/parts/brg-899001

[XLexusTech]

The outlet fitting reduces flow, which affects steering feel. You also need to re-shim the pressure valve just behind the fitting.
Modern saginaw pumps don't come with a shimmed valve anymore. The factory screws the "nut" down, - not all the way, - and uses Loctite on the threads to hold it there. You can buy a shim kit and select a shim stack to limit pressure using the chart they supply. The goal here is to protect the rack from excessive pressure. You want around 1100 to 1200 psi.
https://www.summitracing.com/parts/brg-899001

Thanks David... will get that ordered too.. put the billett specialties piece in over the weekend... have to build a line to get around the pulley so will do the shim kit and call this done