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Old 12-15-2008, 08:25 AM   #76 (permalink)
Christ
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
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Quote:
Originally Posted by FastPlastic View Post
So the weather isn't cooperating when it comes to trying to put insulation on the underside of the hood. First we got freezing rain putting a good 1/4" layer of ice on. Now the temps dropped down to about -4. I did manage to get another run of test data very similar in starting temp and duration to one of the ones from before the weather stripping though.

Before
Starting temp:161F
Ending temp:79F
Ambient temp: 14F
Duration: 1hr 30min
Change:82
Winds: Calm

After
Starting Temp: 181F
Ending Temp: 94F
Ambient Temp: -4F
Duration: 1hr 30min
Change: 87F
Winds: 20-30mph

Considering the run after was 21F lower then the initial run and we had winds of 20-30mph. I would have to say it was well worth the $3 investment and will pay itself off in no time(assuming it hasn't already). By the way I still managed to pull almost 15MPG out of it at -4F. EPA is 14mpg in case you were wondering.
Well, if it doesn't pay you back in gas mileage, it should pay you back in longevity... 21 degrees is a little over 10% of the coolant temps, assuming everything is copacetic with your cooling system.

GOOD find.
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