Coolant Mixture

[Vegas17]

Is it recommended running straight water w/ water wetter or a higher water to coolant mixture for track days on the Supra? Given pure water vs a mixture gives higher cooling capacity seems reasonable but what are your thoughts?

Sponsored

 

[FuzzyRev]

Is it recommended running straight water w/ water wetter or a higher water to coolant mixture for track days on the Supra? Given pure water vs a mixture gives higher cooling capacity seems reasonable but what are your thoughts?

I've used Hy-Per Lube Super Coolant additive in everything for many years with decent results, but hopefully @Rocksandblues @FLtrackdays or @razorlab has experimented and can provide more insight.

 

[Rocksandblues]

I have just added a bit of distilled water. havent tried wetter yet- sorry no help

 

[razorlab]

Should be a 50/50 mix with distilled water anyway. I add a little more distilled water so probably more like 40/60.

 

[kyle9]

I do 80/20 distilled/coolant + water wetter.

If it was warm year round I'd probably not use coolant, but it adds a bit more anti-corrosion and lube anyway, so I guess it's a plus.

In theory it will freeze around 15f.

 

[lucky phil]

Is it recommended running straight water w/ water wetter or a higher water to coolant mixture for track days on the Supra? Given pure water vs a mixture gives higher cooling capacity seems reasonable but what are your thoughts?

The Antifreeze question aside the less coolant you use below 50/50 mix the more corrosion you risk. Straight water with or without water wetter is the most thermally effective solution and ok for race engines where corrosion isn't really a major concern but on a road car it's another thing.
The other thing to remember is that the antifreeze also raises the boiling point of the coolant by a decent margin over and above the system pressurisation increase. This might not seem like a big deal but coolant system architecture isn't a perfect thing especially in the cylinder head galleries and there can be areas of stagnation and low flow where the extra headroom of the higher boiling point can mitigate some of these issues.

Phil

 

[FLtrackdays]

Is it recommended running straight water w/ water wetter or a higher water to coolant mixture for track days on the Supra? Given pure water vs a mixture gives higher cooling capacity seems reasonable but what are your thoughts?

50/50. When low, I add more premix. I’m lazy and it’s easy.

Keep your tire pressure down, bleed or flush your brake fluid often, and do your oil & diff fluid changes a bit more often. That’s what you hear about & notice most.

 

[Vegas17]

The Antifreeze question aside the less coolant you use below 50/50 mix the more corrosion you risk. Straight water with or without water wetter is the most thermally effective solution and ok for race engines where corrosion isn't really a major concern but on a road car it's another thing.
The other thing to remember is that the antifreeze also raises the boiling point of the coolant by a decent margin over and above the system pressurisation increase. This might not seem like a big deal but coolant system architecture isn't a perfect thing especially in the cylinder head galleries and there can be areas of stagnation and low flow where the extra headroom of the higher boiling point can mitigate some of these issues.

Phil

I never would have considered this. Great incite, thank you.

 

[i3igpete]

you generally want glycol mixtures above 25 percent. below that, bacteria will not be killed. at very low levels (say 5 percent-ish) the coolant acts as food for bacteria

Sponsored