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Old 02-07-2004, 08:23 PM   #1
romoranger
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Default coolant 60: 40 water mix bad?

basically i put all the subaru coolant (4 qts) in my wrx and figured it would take factory specs. it didn't. i onnly got about 3 qts distilled water in there. is this a problem, or will i be fine.
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Old 02-07-2004, 09:19 PM   #2
cvalle-sd
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Hail Satan, that's a lot of anti-freeze. I'm in San Diego, and I'm only running 20% and a bottle of Hyperlube (green water wetter)

The label says 50-70%, but in the southwest, we're definitely in the warmer end of the scale. I'd go 50% tops.

Unless it gets below 40deg there at night (it might), I'd cut back. You're definitely going to want water's higher heat content, come summertime, and the livin's easy. Yes, as a matter of fact, I AM drinking. You could just siphon off a little more than half of the radiator's contents, refill with distilled or deionized water, and that'd give you 20-30% antifreeze. If my arithmetic is intact..which it most likely is not; but you see where I'm going with this.

Last edited by cvalle-sd; 02-07-2004 at 09:27 PM.
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Old 02-07-2004, 09:57 PM   #3
nicrfe1370
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Quote:
Originally posted by cvalle-sd
Hail Satan, that's a lot of anti-freeze. I'm in San Diego, and I'm only running 20% and a bottle of Hyperlube (green water wetter)

The label says 50-70%, but in the southwest, we're definitely in the warmer end of the scale. I'd go 50% tops.

Unless it gets below 40deg there at night (it might), I'd cut back. You're definitely going to want water's higher heat content, come summertime, and the livin's easy. Yes, as a matter of fact, I AM drinking. You could just siphon off a little more than half of the radiator's contents, refill with distilled or deionized water, and that'd give you 20-30% antifreeze. If my arithmetic is intact..which it most likely is not; but you see where I'm going with this.

20-30%? Wow, that seems wrecklessly low for a street car. Hopefully some other people with good material to reference will jump in here.
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Old 02-07-2004, 10:48 PM   #4
romoranger
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i like the siphoning idea, if i siphoned about 1 quart, then replaced that quart with distilled water i would be at a perfect solution of water and coolant. thanks!
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Old 02-07-2004, 10:50 PM   #5
cvalle-sd
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If you're replacing the coolant at the proper intervals, and are in no danger of freezing, that is hardly reckless. Plus the water wetter/hyperlube adds its own corrosion protection.

Pure water is going to remove heat more efficiently, close to twice as well as pure antifreeze. Antifreeze has a much higher boiling point and lower freezing point, though, and slows corrosion. Pure water is fine for short-term applications like racing, especially since they wouldn't want anything slick to get dropped on the track. Pure water is no good for the road, since your service intervals are long enough that your coolant is going to start eating the metals too soon. Pure antifreeze would only prevent boil-over, not really keep the system as cool as it needs to be. Thus the concept of a mixture. The directions on the antifreeze bottle are intended to give an average user, Maine to Mexico, a trouble-free experience. It is not going to give everyone the best possible result. If your daytime highs are like the Upper Peninsula in January, you'll be wanting 70% antifreeze...maybe more, I dunno. If you are in Southern California, Arizona, Texas, etc. in deep summer, especially stuck in traffic at 3pm, you might find that 50% water isn't cutting it. Especially if you're already in a turbocharged, octane-limited environment. Regardless of the percentages, you have to know what mixture does what best, what you need done, and most of all, you have to be as thorough about coolant maintenance as you are about engine oil, tire pressure, battery levels, gear oil, etc. None of it should be accidental or random. If I had a turbo setup, I'd mix for maximal heat removal, and just count on having to flush/replenish more often. If you're going to just do what the bottle says, and leave it in for 30-50k miles, then you're not really being very careful there either.
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Old 02-09-2004, 02:10 AM   #6
jlevy
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Just for reference, I'm running 35% antifreeze and watter wetter year round. Of course I'm in Houston (actually south Houston) where it's very rare to see temps below about 28 deg F.

-my 0.02
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Old 02-10-2004, 01:42 AM   #7
romoranger
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this weekend i am reflushing with a 30 coolant/70 water premixed so i do not run into this problem again. thanks for the help
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