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Author Topic: Do you use grill blocks to improve fuel economy? Back to Topics
Sal30

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Philadelphia

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Message Posted: Apr 28, 2013 1:40:37 PM

I'm thinking of installing grill blocks, getting super light weight steel wheels with moondisc hubcaps, radio antenna removal and wipers removal if I move to LA. My 15" alloy wheels weigh 22 lbs each but the steel wheels for a 2002 Passat only weigh 15 lbs each. Do you think these mods will increase my epa fuel economy from 28 hwy to 30+ hwy? BTW, these mods will cost less than free if I sell my 4 allow wheels.
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contiki
Champion Author Ontario

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Message Posted: Apr 19, 2014 7:24:42 AM

Never............
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hoopitup2000
All-Star Author Virginia

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Message Posted: Apr 19, 2014 7:19:03 AM

Yes . . . .
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contiki
Champion Author Ontario

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Message Posted: Apr 17, 2014 7:04:10 AM

Never...........
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jdda
All-Star Author Alberta

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Message Posted: Mar 30, 2014 9:02:36 AM

no
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hoopitup2000
All-Star Author Virginia

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Message Posted: Mar 30, 2014 12:31:04 AM

Yes, the car warms up noticeably faster on cold mornings as well.
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mhradecky
Veteran Author New York

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Message Posted: Mar 30, 2014 12:22:02 AM

no.
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WES03
Champion Author Maryland

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Message Posted: Feb 7, 2014 10:49:47 AM

They tape the grills in NASCAR to improve aerodynamics.
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oilpan4
Champion Author Virginia

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Message Posted: Feb 7, 2014 10:32:39 AM

You can't see the grill bolcks installed on newer vehicles, they are behind the plastic external grill.
Most people who have them dont even know they are there.
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contiki
Champion Author Ontario

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Message Posted: Feb 7, 2014 6:47:59 AM

I haven't known any person that has grill blocks on their vehicles....

Crazy idea..........
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dctimmons
Rookie Author Virginia

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Message Posted: Feb 6, 2014 11:47:33 PM

No grill blocks on either vehicle. Agree that there's better ways to increase fuel economy.
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dontuknowOH
Champion Author Ohio

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Message Posted: Feb 6, 2014 1:16:10 PM

I must agree with oilpan4.... The streamline aerodynamics of a proper grill air catch area works two function, the second benefit is stopping cold air blasts from hurting the engine thermo heat dynamics of an ICE engine, allowing it to get the most expansion power from the fuel being burnt up during cold/extreme colder weather.

The aerodynamics improves the frontal vehicle nose area resisting forces by better slip streaming even at common highway speeds, during any weather.
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oilpan4
Champion Author Virginia

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Message Posted: Feb 6, 2014 12:56:02 PM

Wind tunnel test have proven that grill blocks can reduce aero dynamic drag by 20% to 30% and can reduce warm up time.
Why are they a bad idea again?

Just because your car doesnt have them doesnt mean they are a crazy idea. It means you are driving out dated vehicles with primitive aero dynamics.
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PatAZ
Champion Author Tucson

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Message Posted: Feb 6, 2014 12:53:56 PM

I doubt you will get that much improvement.
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dontuknowOH
Champion Author Ohio

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Message Posted: Feb 6, 2014 10:32:36 AM

Vintage cardboard/duct-tape clear/coated, refined moveable slots, just for Winter trials tests, remember one doesn't want to cause the E.. coolant fans to work extra duty, that will kill off any fuel savings efforts.
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GLM4205
Champion Author Toledo

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Message Posted: Feb 6, 2014 10:19:21 AM

But what for?
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OilerFan
Champion Author Tulsa

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Message Posted: Feb 6, 2014 7:37:31 AM

I would consider a grill block in really cold weather, but not removing wipers.
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flguy71
Veteran Author Orlando

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Message Posted: Feb 6, 2014 7:19:05 AM

no grill blocks.... getting rid of wipers bad idea
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contiki
Champion Author Ontario

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Message Posted: Feb 6, 2014 6:34:07 AM

Both my vehicles have NO grill blocks.................

I haven't known any person that has grill blocks on their vehicles....

Crazy idea..........
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randy3116
All-Star Author Tennessee

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Message Posted: Feb 6, 2014 5:29:40 AM

no
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drydem
Sophomore Author Maryland

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Message Posted: Feb 6, 2014 4:43:41 AM

short answer: No.

Long answer:
The cheapest mod to your 2002 Passat is to increase the tire pressure by 8 psi from the door jam and then learn how to hypermile your Passat by reading the FAQs on Cleanmpg-*-com you should be able to beat the EPA rating for your car by 10% to 20% but you must master Pulse n Glide, Driving without Brakes, and smart braking driving techniques.

A more expensive fuel efficiency modification is to get low rolling resistant tires like Michelin Energy Saver All Season Tires ($500) this will improve your fuel efficency probably by about 3% to 5% if you are switching from just regular touring all season tires.

Grill blocking will help thermal efficiency of the gasoline engine during the winter if you drive below 40 mph in temperatures below 40 F degrees for longer than 40 minutes or if you get stuck in a traffic jams in cold weather. you need to monitor the engine coolant temperature if you do grill blocking at higher speeds or at higher driving temperatures.

Alloyed wheels while weighting less will not help much with fuel efficiency. Aerodynamic treatments like swapping out a regular radio antenna with a shark fin antenna and using aerodynamic hubcaps will have only a minimal affect on Fuel efficiency even at highway speed because they don't cause much drag due to their small size. Removal of the wipers is a safety hazard and wipers don't contribute that much to drag. If you wanted to make the 2002 Passat more fuel efficient at very high speeds (+50 mph) install rear wheel skirts and reshape the rear end into a boattail - see to see how that is done see Ecomodder-@-com. Grill blocking, road hugging fenders, and underside skirts have little to almost NO fuel efficiency impact unless the car is going over 100 mph on very smooth racing track - but they do look cool. :-P

BTW: I have an overall fuel efficiency of 60 mpg over 48,000 mile over almost four years driving a 2010 Prius.

[Edited by: drydem at 2/6/2014 4:51:32 AM EST]
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pt1KY
Champion Author Lexington

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Message Posted: Feb 5, 2014 3:54:08 PM

no
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contiki
Champion Author Ontario

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Message Posted: Feb 5, 2014 7:22:08 AM

oilpans says "If its a crazy idea then why are all the auto manufacturers using grill blocks? "

oilpan...... Both my vehicles have NO grill blocks.................

I haven't known any person that has grill blocks on their vehicles....

Crazy idea..........
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MertieMan
Champion Author Lexington

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Message Posted: Feb 5, 2014 5:10:43 AM

You are wasting your time plus you are going to overheat you car in the process.
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GrumpyCat
Champion Author Alabama

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Message Posted: Feb 4, 2014 3:33:16 PM

This past Christmas I was 2 miles out of a warm garage when I gave serious thought to turning around to put cardboard in front of my radiator. Temperature was 2°F. The Fool Computer indicated 23 MPG the next 100 miles when several days prior at 40°F it had been showing 30 MPG and 28.6 MPG calculated at the pump for 500 miles. The return 500 miles got 27 MPG. No doubt some of that is due to different sources of diesel but the temperature was 40°F colder.
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oilpan4
Champion Author Virginia

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Message Posted: Feb 4, 2014 10:36:47 AM

If its a crazy idea then why are all the auto manufacturers using grill blocks?
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contiki
Champion Author Ontario

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Message Posted: Feb 4, 2014 6:59:05 AM

Another crazy idea............
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Madridjoe
Veteran Author Lancaster

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Message Posted: Feb 4, 2014 6:37:37 AM

No
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RalphHightower
Champion Author South Carolina

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Message Posted: Feb 4, 2014 5:58:13 AM

no
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twt
Champion Author Virginia Beach

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Message Posted: Feb 4, 2014 5:23:48 AM

I've never used grill blocks. The grill is there, to help cool the engine. Don't mess with it.
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krazkar
Champion Author Calgary

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Message Posted: Feb 3, 2014 11:43:46 PM

no
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myst999
Veteran Author Colorado

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Message Posted: Feb 3, 2014 9:32:45 PM

No, I have never used grill blocks.
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szd55
Veteran Author Ontario

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Message Posted: Feb 3, 2014 8:16:13 PM

If you drive a diesel, and it's cold, grill blocks let it warm up more quickly.
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RalphHightower
Champion Author South Carolina

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Message Posted: Jul 16, 2013 6:39:51 AM

no
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Jmac2008
Champion Author Missouri

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Message Posted: Jul 16, 2013 1:16:43 AM

no
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FrankLee1
All-Star Author Minnesota

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Message Posted: Jul 14, 2013 9:54:09 PM

Several new vehicles are equipped with adjustable grille blocks from the factory. The engineers must be stupid and the experts posting on GB must know something they don't.
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d_clark
Champion Author Grand Rapids

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Message Posted: Jul 14, 2013 8:53:14 PM

no
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RodOrRob
All-Star Author Mobile

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Message Posted: Jul 14, 2013 6:27:20 PM

I would guess you "might" go from 28 mpg to 28.01 mpg.
BTW, gas mileage only accounts for about 25% of overall ownership.
Maybe save your money toward a better mpg car when you are in need of a new car.
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Barthasgas
Rookie Author Raleigh

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Message Posted: Jul 14, 2013 6:18:37 PM

no, not yet
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dv8jane
Veteran Author Chicago

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Message Posted: Jul 12, 2013 6:56:48 PM

Another crazy idea.....who thinks these ideas up.....
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contiki
Champion Author Ontario

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Message Posted: Jul 11, 2013 6:29:24 AM

Another crazy idea............
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FrankLee1
All-Star Author Minnesota

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Message Posted: Jul 10, 2013 3:12:28 PM

I put an adjustable grille block on my Tracer but it's too early to tell if fuel economy improved. It sure warms up quicker though!
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DHIGAJ
All-Star Author Toronto

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Message Posted: Jul 8, 2013 5:40:49 PM

no
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jl1rp
Champion Author New Hampshire

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Message Posted: Jul 8, 2013 4:52:18 PM

Yes it lowers the drag of the car. But temp will go up if it stays closed off.
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dgsteven
Champion Author Los Angeles

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Message Posted: Jun 18, 2013 3:01:56 AM

no
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contiki
Champion Author Ontario

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Message Posted: Jun 17, 2013 7:56:47 PM

Never heard of this before..........
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oilpan4
Champion Author Virginia

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Message Posted: Jun 17, 2013 2:04:45 PM

"The OEMs are starting to employ grill blocks to improve mileage. "

The ecomodders come up with a good idea every once in a while.
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Houckster
Champion Author Atlanta

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Message Posted: Jun 17, 2013 10:48:10 AM

The OEMs are starting to employ grill blocks to improve mileage.
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weddy11
Champion Author Phoenix

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Message Posted: Jun 17, 2013 9:50:30 AM

No
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contiki
Champion Author Ontario

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Message Posted: Jun 17, 2013 7:58:27 AM

Another crazy idea.....who thinks these ideas up.............
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GLM4205
Champion Author Toledo

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Message Posted: Jun 17, 2013 5:46:38 AM

No
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