Go Back   986 Forum - for Porsche Boxster Owners and Others > Porsche Boxster & Cayman > Boxster Racing Forum

Reply
 
LinkBack Thread Tools Display Modes
Old 11-14-2017, 04:01 AM   #1
Registered User
 
Join Date: Oct 2014
Location: SE Ma
Posts: 219
Change distilled water coolant?

I use distilled water with water wetter for cooling. Car winters in heated garage. Is it necessary (or prudent) to drain and change on a schedule?
Deadeye is offline   Reply With Quote
Old 11-14-2017, 05:35 AM   #2
Registered User
 
schnellman's Avatar
 
Join Date: Oct 2008
Location: Ohio
Posts: 866
No to straight water

You should be using a 50/50 blend of water and coolant year 'round. The coolant has additives that not only prevent freezing and raise the boiling point, but provide rust protection and lubrication. Porsche recommends its own (expensive) brand of coolant. However, any good brand such as Prestone, will do. And, leaving the system dry is not a good idea.
schnellman is offline   Reply With Quote
Old 11-14-2017, 06:12 AM   #3
Registered User
 
Join Date: Dec 2011
Location: SLC
Posts: 89
My car lives in a heated garage and I follow a once a year drain interval. I refill with two bottles of water wetter + distilled H20. Done this for years with no ill effects.
MaxD is offline   Reply With Quote
Old 11-14-2017, 06:39 AM   #4
Registered User
 
steved0x's Avatar
 
Join Date: Dec 2012
Location: FL
Posts: 3,188
I think the water wetter also provides the lubricants and things that you would normally get when running a 50/50 antifreeze blend.
steved0x is offline   Reply With Quote
Old 11-14-2017, 11:09 AM   #5
Registered User
 
Join Date: Oct 2014
Location: SE Ma
Posts: 219
I should have said this is a track only car from April to October.
Deadeye is offline   Reply With Quote
Old 11-14-2017, 12:37 PM   #6
Registered User
 
Join Date: Dec 2011
Location: SLC
Posts: 89
Also it is OK to drain and leave it dry if you suspect freezing temps (i.e. the power goes out). We had to drain every night when running the (late) Grand Targhee hillclimb at 7851 ft. Just refilled in the morning with jugs from the room and you are on your way.
MaxD is offline   Reply With Quote
Old 11-14-2017, 04:10 PM   #7
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 6,552
I use distilled water + water wetter in my Spec Boxster.

I change it every 2-3 years to replenish the additives in the water wetter because the water wetter gets slowly diluted over time as I top up using only distilled water.

Water alone is a better conductor of heat (+17% heat capacity at 220F as compared to 50/50 antifreeze). Plus, in the case of a leak/incident, water + water wetter doesn't create an oily slick on the track like antifreeze.
__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor

Last edited by thstone; 11-14-2017 at 04:26 PM.
thstone is offline   Reply With Quote
Old 11-14-2017, 05:52 PM   #8
Registered User
 
AZ986S's Avatar
 
Join Date: Jun 2016
Location: Arizona
Posts: 183
My indie and chief PCA instructor here in AZ recommended distilled water and water wetter. I initially disagreed with him about the reduced boiling temp compared to 50/50 mix but it is true that it extracts heat better. I think that the coolant system pressure elevates the boiling point of water so 220F is fine. I live in AZ so it doesn't affect me too much. Also what THSTONE said about loosing coolant on the track... that makes sense to me if you track your car a lot. I do wonder however about the anti corrosion properties of the antifreeze...
__________________
2002 Boxster S - Arctic Silver, Black Leather interior, 6 speed, Black Top, Matching Silver Hartop, Borla CatBack, 2nd cat delete, LNE IMSB Pro, IPD Competition Plenum, 74 mm TB, Vivid Racing Tune, Tarett UDP, Eibach Swaybars, wheel studs, 15 mm wheel spacers on all 4, EBC yellow stuff pads, Sebro rotors, EBS oil baffles, 160 deg Thermostat, 2 quart Accusump, full filtration remote oil filter, rad fan switch, custom gauge/switch plate, 80K miles

Last edited by AZ986S; 11-14-2017 at 05:56 PM.
AZ986S is offline   Reply With Quote
Old 11-15-2017, 08:51 AM   #9
Registered User
 
Join Date: Nov 2006
Location: In the garage...
Posts: 1,327
Quote:
Originally Posted by thstone View Post
...Plus, in the case of a leak/incident, water + water wetter doesn't create an oily slick on the track like antifreeze.
Exactly. Point in case... this recent Nürburgring 14 car pileup. Unfortunately, cause was preventable two ways... first running WW as opposed to coolant. More importantly someone did not fix the well documented coolant hose pop-off issue of 996/997 Turbo, GT3, GT2 and GT3RS... First hand saw a similar incident a few years ago at Mid-O when a 996's popped in Madness... 8-9 cars collected quickly against tirewall before corner worker could flag traffic.

P-car and other carnage not for faint of heart... Thankfully the injuries limited from what I've read:





Another camera...


Freak 14-car pile-up mars otherwise perfect weekend | BridgeToGantry.com

LIFESAVING lesson E30 driver ignored was 'unless you/your car are on fire... stay IN your vehicle until safety personnel are on scene and advise you to exit'. He was EXTREMELY lucky on a number fronts... Not to mention the driver who stayed on track side of armco

Be safe
__________________
"Cool Prius!"
- Nobody
Burg Boxster is offline   Reply With Quote
Old 11-15-2017, 01:52 PM   #10
Registered User
 
Join Date: Oct 2014
Location: SE Ma
Posts: 219
Yes, that's why I use water and not coolant. What I am asking is if the water with water wetter needs to be peridically changed.
Deadeye is offline   Reply With Quote
Old 11-15-2017, 02:59 PM   #11
Registered User
 
Join Date: Nov 2006
Location: In the garage...
Posts: 1,327
All OEM coolant, in spite of "lifetime" monikers need changed. In most cases though "lifetime" means until some other part's lifetime ends resulting in dumping much of your coolant; at which point you have to replace

WW will break down w/ extensive & extreme hi-temp exposure (google can help you find their MSDS and ASTM spec info).

All in all though, you're not going to find a "frequency guide" b/c too much depends on how and under what conditions you use your car... same w/ oil changes and brake bleeding/flushing. In most cases those minimally are annual and every two or three years respectively (usage dependent).

Personally, I err on side of caution and change more frequently than not. You know, I've never had a motor (or service adviser for that matter) complain about too frequent oil change. Well one time a BMW SA did but that's another story... And, in the grand scheme of things it's VERY inexpensive for the cheap insurance provided.

In short, YES needs changed periodically.

Good luck
__________________
"Cool Prius!"
- Nobody
Burg Boxster is offline   Reply With Quote
Old 11-15-2017, 04:56 PM   #12
Registered User
 
Join Date: Dec 2011
Location: SLC
Posts: 89
I've never had my coolant analyzed...

Using Tom's schedule (which I have used in many cars, again with no ill effect ), on the second year the mix tends to discolor. Does this mean something is awry, probably not.

My M3 has a cast iron block and the coolant looks cloudy and brown after a few months.The boxster stays clean with a red/pink hue on the yearly scheme and my interval is mostly based on taking something apart that needs the coolant drained.

For track cars, run water and a supplement of whatever brand you find handy. Straight H20 works too.

Having the system dry is fine but don't start the car! It's all too easy to do on extended projects ( I put warning post-its everywhere now)

Please, no glycol on the tarmac.
MaxD is offline   Reply With Quote
Old 11-15-2017, 06:30 PM   #13
Track rat
 
Topless's Avatar
 
Join Date: Nov 2006
Location: Cucamonga CA
Posts: 3,479
Garage
Distilled plus water wetter works fine and the only downside I can see is losing some of the corrosion protection from OEM coolant that protects your T-stat, water pump, and internals. All coolant should be changed periodically as it does get contaminated over time. Following thstone's schedule makes sense to me.
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor
PCA Zone 8 DE/TT Chair (SoCal, AZ, NV)

Last edited by Topless; 11-15-2017 at 06:34 PM.
Topless is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 11:44 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2016 Pelican Parts - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page