Show off your Grille Block

[aerohead]

Some folks actually measured the ram air pressure in front of a radiator in Denver,Colorado at 70-mph.
They saw a 0.051 psi boost,for a 0.418% power increase
Here's a link to the article
MGB Cold Air Induction (especially for V6 and V8 Builders)

[Fat Charlie]

And the car has sensors to measure it behind the air filter.

Instead of asking if vehicle speed can be used to increase boost, I'm just maintaining that a grille block doesn't reduce it. I'm also not worried about increasing boost because while it helps put more air (and therefore gasoline) into the cylinder for each combustion cycle, that makes the car go less far for each drop of gasoline.

[ConnClark]

Originally Posted by Fat Charlie

And the car has sensors to measure it behind the air filter.

So?

Instead of asking if vehicle speed can be used to increase boost, I'm just maintaining that a grille block doesn't reduce it.

A grill block can reduce it depending how it is done.

I'm also not worried about increasing boost because while it helps put more air (and therefore gasoline) into the cylinder for each combustion cycle, that makes the car go less far for each drop of gasoline.

Not really. As long as you don't drive around with it floored all the time the throttle just closes more until you get the same power you would drive with normally.

[Fat Charlie]

So, added or reduced pressure upstream of the filter may not translate a change downstream of it, where the air actually gets sucked into the cylinders.

I know that most cars won't see any power benefits from homebuilt forced induction- I explain to customers that if the ECU isn't looking for additional air, slapping on a cold air intake on isn't going to get them any extra power even if they rig it with a leaf blower. Yes, sometimes I have to try a downsell. I was looking at it from the other direction: what if we blew unicorn farts into the air box and got the power that airflow math led us to hope we'd see? We'd drop our mpg. If I wanted that I'd have bought a different car.

[ConnClark]

Originally Posted by Fat Charlie

So, added or reduced pressure upstream of the filter may not translate a change downstream of it, where the air actually gets sucked into the cylinders.

Since the air filter is porous it will.

I know that most cars won't see any power benefits from homebuilt forced induction- I explain to customers that if the ECU isn't looking for additional air, slapping on a cold air intake on isn't going to get them any extra power even if they rig it with a leaf blower.

The ecu is only concerned with keeping the fuel mixture right. If you force more or less air down it it adjusts. It has to do this to adjust for air pressure changes due to altitude. There are dyno tests on youtube that prove this using leaf blowers.

Yes, sometimes I have to try a downsell. I was looking at it from the other direction: what if we blew unicorn farts into the air box and got the power that airflow math led us to hope we'd see? We'd drop our mpg. If I wanted that I'd have bought a different car.

Assuming unicorn farts are mostly methane like other farts they would burn and the ecu would lean out the fuel mixture to compensate. Net result would be lower fuel consumption.

[bikeprof]

I guess UNICORN farts would then be a good business to get into, and promote it here in the Ecomodder forum ?
Imagine what amounts of business there would be �� !

Heck, might be easier to locate and carry a cow for simplifying UNICORN search, them things ARE scarce !
Cow methane octane similar to UNICORN methane octane, which would be a better burn ?

[Fat Charlie]

Unicorn based methane is actually not a greenhouse gas.

[RedDevil]

Originally Posted by Fat Charlie

Unicorn based methane is actually not a greenhouse gas.

It lines the hole in the ozone layer with a nice rainbow

[Mifunego]

Before:



Then I got a hold of an extra one of these and some 1/8" flexible plastic at Home Depot:



A little creative hacksawing on the grille and slicing of the plastic:



Now it's a pretty simple swap from the open grille to the blocked grill once the weather cools down, and vice versa.

[phh]

Originally Posted by NachtRitter

Not quite as purdy as others on this thread so far:

I just looked at your modification thread VW MkIV Aerodynamic Mods (For Jetta and Golf). Wow! Very informative. Much thanks.