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Old 12-03-2015, 02:17 AM   #51 (permalink)
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My 2013 Passat has the engine air intake at the top of the grill, so I'm inclined to not cover that up! I'm wondering if nobody else is worrying about that? I don't see any evidence of it in these pictures. Seems to me this car relies a bit on a ram air effect...

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Old 12-03-2015, 07:37 AM   #52 (permalink)
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Quote:
Originally Posted by PaulB2 View Post
Seems to me this car relies a bit on a ram air effect...
Not if it's got an air filter. That'll add more restriction than any grille block can. Those ducts are more of a cold air intake than a ram.
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Transmission type Efficiency
Manual neutral engine off.100% @MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%

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Old 12-03-2015, 05:21 PM   #53 (permalink)
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NAStruck

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Originally Posted by kach22i View Post
I watched a little NAStruck racing today on TV, pretty sure they were all grille blocked.

Fake grilles to match the fake headlights and taillights.
Yes,typically,they'll have that low,low, inlet,just above the splitter.And during the race they may add or subtract duct tape depending on what telemetry tells the crew chief.
If the fans get careless,their plastic garbage bags get out on the track,potentially disastrous to an engine if it blocks the cooling inlet too long before the truck can pit.
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Old 12-03-2015, 06:23 PM   #54 (permalink)
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here is my grill block



and here is the subtile grill block i made on the 2012 chevrolet cruze eco of my friend



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I know i dont have a very good write-up
no lean-burn? no good gear ratio? p&g is the answer
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Old 12-03-2015, 06:49 PM   #55 (permalink)
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Quote:
Originally Posted by PaulB2 View Post
My 2013 Passat has the engine air intake at the top of the grill, so I'm inclined to not cover that up! I'm wondering if nobody else is worrying about that? I don't see any evidence of it in these pictures. Seems to me this car relies a bit on a ram air effect...
Most of the new vehicles DO have a ram air action, helps with the MPG's at speed.
Granted, majority of cars are still aspirated motors, yours may not. TDI ?

Leave equal size breathing space as the air intake space for the radiator cool air entrance.
You being in the cold temperatures could adjust tighter +/_

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Old 12-04-2015, 12:42 PM   #56 (permalink)
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Most of the new vehicles DO have a ram air action, helps with the MPG's at speed.
Source?

I ask because I don't think this is correct. Getting more air in would decrease mileage, for the same reason a warm air intake increases it. And I know of no new vehicles, aside from a few exotics, that place the engine intake in the high-pressure area at the front of the car, which is the only place you would get a "ram air" effect, unless you count the fact that the pressure underhood is going to be higher than ambient anyway as "ram air."
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Old 12-04-2015, 01:13 PM   #57 (permalink)
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Most times, the "ram air effect" is the same as the "downforce effect" from rear wings: high school kids want to buy them.
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Old 12-04-2015, 05:05 PM   #58 (permalink)
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ram air

Goldenrod experienced a 4-psi ram air boost inside the four Bauman scoops at 421 mph.At legal highway speeds,this would be pretty much off the radar screen I think.
There is a formula for it.
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Last edited by aerohead; 12-04-2015 at 06:11 PM.. Reason: add image
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Old 12-04-2015, 05:31 PM   #59 (permalink)
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I feel like third down and 20+ yards to go...
Good thing is: Manning or Staubach are on my side !
Even "Dandy Don", "Panty-hose Joe " could get me across this mine field, �� !
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Old 12-04-2015, 07:43 PM   #60 (permalink)
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Quote:
Originally Posted by PaulB2 View Post
Seems to me this car relies a bit on a ram air effect...
Relies.... No. Benefits ... probably.

Gas cars benefit from power with ram air because it can help pack more air and fuel mixture into the cylinders. If memory serves me right you can get about 0.15 psi of boost at 70mph. I admit thats not a lot but can equate to about 2 to 5 hp depending on the engine.

A diesel car will benefit in both power and economy as excess air boost efficiency.

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