Warning Presures / Temps.

[Rory]

Good people of TGTT,

Ive just installed a "SPA" Dual read out gauge, Water Temp and Oil Presure.
This gauge can be set with warnings for temp and presure.

What would be classed as a low oil presure, just so i can set warnings, for next weekend?

At idle it sits around 29/30 psi, after a few laps (from last weekend)
This is obviously spirited driving.

Im not to fussed on the water temps, as i try and stay below 95c.

Basiclly, what would everyone set theres at? Just for referance more than anything.

Thanks for your input.

Rory

 

[Toby@ToyTuning.com]

For oil temp set at 140 degrees and water 100 degrees

T

 

[Toby@ToyTuning.com]

Just realised you meant pressure, tuff one as it will vary on cold start, warm starts and if you have things like an oil cooler. I would say 1.0 bar oil pressure when on the move and disregard when idling. You really want to see above 3 bar when on a "spirited" drive.

T

 

[Rory]

Its the presure im more worried about.

I have an oil cooler to go on, this weekend, with the 80 deg thermostat.
Last weekend, it rand around 50psi on the track, even after a few laps, but this next weekend, will be a bit harder.....

Ill set it for 20psi for low presure light.
The oil presure is fine, but with a trackday next weekend, im watching what goes on.

 

[Toby@ToyTuning.com]

Yeah that should be okay Rory, all engines will be slightly different as well but when you are at the track you will get the true picture, let us know how you get on

T

 

[GTti]

For oil temp set at 140 degrees and water 100 degrees

T

Alot of the good oils are shear safe untill 140 degress, so thats a good figure slightly less. As you suggested the water shouldn't be heading above 100 deg.

30psi on hot idle doesn't sound too bad, I think mine is around 2 - 2.5 BAR on hot idle.

 

[goldenvtr]

mine was 30-35 on hot idle ad about 90 during a ragging

 

[Rory]

Dan,

Sounds like what mine is doing just now.

Thanks for all the input boyos.

Rory

 

[Gee]

If this for track?

If going hard, you sure the water temperature needs to stay below 100c?

Toby, I am sure the temps were over 100c on that Best Motoring Video test.

Anyway,

My oil pressure is around 4 bar when driving and 2 bar on idle.

 

[WallaceGlanza]

If this for track?

If going hard, you sure the water temperature needs to stay below 100c?

Toby, I am sure the temps were over 100c on that Best Motoring Video test.

Anyway,

My oil pressure is around 4 bar when driving and 2 bar on idle.

Water boils at 100c so its not really that good at cooling above that, you'll end up blowing the head gasket getting hotter than that.

You sure it was water temp in the vid?

 

[Gee]

I thought the cap/coolant raised the boiling point if the water?

 

[GTti]

Water boils at 100c so its not really that good at cooling above that, you'll end up blowing the head gasket getting hotter than that.

You sure it was water temp in the vid?

Water does, but water with coolant increases the boiling point to approx 120c I think. Under pressure even more.

But pure water is a better conductor of heat than water and coolant.

 

[Gee]

Water does, but water with coolant increases the boiling point to approx 120c I think. Under pressure even more.

But pure water is a better conductor of heat than water and coolant.

Just checked the video..

They had a limit set on the water temp of 110c as a safety margin. So, it is probabaly around 120c and they set a warning to let off around 110c, which is obviously close to 120c haha.

Thats true about the water..maybe run pure water on track and fill back with coolant after the session..just make sure it does not get to 100c! Or put some water wetter in with it, which is even better.

And for the reference, the oil temperature warning was set at 140c

 

[350ep70gr]

Water does, but water with coolant increases the boiling point to approx 120c I think. Under pressure even more.

But pure water is a better conductor of heat than water and coolant.

X2 water boils to 100c at the sea level pressure. In the radiator we have at least 1.1 to 1.3 bar pressure so boiling point will rise a bit and if coolant is added will rise more!

 

[WallaceGlanza]

Water does, but water with coolant increases the boiling point to approx 120c I think. Under pressure even more.

But pure water is a better conductor of heat than water and coolant.

True, I wasn't sure what difference the coolant makes to the boiling point, but the point about the pressure is correct. With a standard 1.1 bar rad cap the boiling point of pure water would be 103c and at with a 1.3 bar cap it would rise to almost 110c before boiling.

So depends on the coolant being used and pressure in the system, I'd still prefer to keep it under 100c just to play safe though.