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

Rookie Author
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.
REPLIES (newest first) Post a Reply
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cv
Champion Author Raleigh

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Message Posted: Aug 20, 2014 5:50:49 AM

I haven't tried that yet.
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BCNU
Champion Author British Columbia

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Message Posted: Aug 20, 2014 5:28:09 AM

no
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oilpan4
Champion Author Virginia

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Message Posted: Aug 19, 2014 11:40:58 PM

"No, it's also not good for your engine if you use grill block."

How you figure that?
If true then why are all the manufactures using grill blocks in new vehicles?
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Awing1
All-Star Author Ontario

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Message Posted: Aug 19, 2014 3:20:16 PM

No, it's also not good for your engine if you use grill block.
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GrumpyCat
Champion Author Alabama

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Message Posted: Aug 19, 2014 2:54:45 PM

I think all those mods will boost your MPG from 28.0 to 28.05 MPG!

Agree LRR tires will do more than everything else you mentioned.

I do put cardboard over my radiator when temperatures are below freezing. Otherwise it takes about 100 miles for my diesel SUV to get up to its normal efficiency/economy. With cardboard it only takes 10-15 minutes.
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BigHorne1
Champion Author Missouri

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Message Posted: Aug 19, 2014 2:24:15 PM

no
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PaylessKY
Champion Author Kentucky

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Message Posted: Aug 19, 2014 1:08:42 PM

No
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contiki
Champion Author Ontario

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Message Posted: Aug 18, 2014 7:47:53 AM

Never......
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FarmTech
Champion Author Virginia

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Message Posted: Aug 13, 2014 7:21:03 AM


NO
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ace12012
Champion Author Phoenix

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Message Posted: Aug 12, 2014 3:41:39 PM

no.
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Awing1
All-Star Author Ontario

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Message Posted: Aug 12, 2014 10:03:02 AM

no
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WEDDY
Champion Author Phoenix

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Message Posted: Aug 12, 2014 9:46:05 AM

No
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twt
Champion Author Virginia Beach

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Message Posted: Aug 12, 2014 4:42:33 AM

Never have.
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BCNU
Champion Author British Columbia

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Message Posted: Aug 12, 2014 3:22:02 AM

nope
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JoeKing
Champion Author Manitoba

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Message Posted: Aug 8, 2014 1:18:39 AM

no
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drydem
Sophomore Author Maryland

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Message Posted: Aug 7, 2014 6:36:04 AM

for most cars, when driving under 40 mph - less than 30 percent of the energy used by your car is used to overcome aerodynamic drag and over 60 percent of the energy used by your car is use to overcome rolling resistance - which is why if you are driving under 55 mph - Low Rolling Resistant tires are more helpful in getting better fuel efficiency.

when driving over 65 mph - over 60 percent of the energy used by most cars is used to overcome aerodynmic drag - which is why removing the rooftop carriers can be so very helpful in getting better fuel efficiency at high speeds. With respect to how much aerodynamic drag is created - it isn't just how aerodynamic a drag surface is but how big the drag surface area is. The smaller the drag surface is the lower the drag forces are. Smaller surfaces ares like radio antenna and windshield wipers have little effect on aerodynamic drag unless you are going over the speed of sound.

The biggest hit to a vehicle's fuel efficiency is doing a full stop because all the energy used to get it up to speed is lost - the most important hypermiling technique to learn is Driving without Brakes (DWB) followed by Smart Braking ... both work with any vehicle both work to maintain and conserve a vehicle's mommentum - especially at low speeds.

[Edited by: drydem at 8/7/2014 6:39:58 AM EST]
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drydem
Sophomore Author Maryland

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Message Posted: Aug 7, 2014 6:14:52 AM

A 2002 VW Passat sedan is rated at 28 mpg hwy 18 mpg city by the EPA.
........

Grill blocking can help fuel efficiency when the driving temperature drops below 60 Fahrenheit degrees if a conventional gas/diesel vehicle is hypermiled under 40 mph for the first 1 or 2 hour of driving unless the driving temperature drops below 40 Fahrenheit degrees. If the driving temperature drops below 40 degrees Fahrenheit - grill blocking helps all the time the temperature is that low. For any driving temperature, grill blocking rarely help increase fuel efficiency when a conventional gasoline Otto cycle vehicle is driven over 55 mph for anything over 15 minutes but may help diesel vehicles when driven over 55 mph if they are driven all day long.
.........

To get better fuel efficiency, rather than spend over $400 to $600 on super light weight steel wheels with moondisc hubcaps trade -- upgrade to Low Rolling Resistant (LLR) tires like a set of Michelin Energy Saver All Season Tires (estimated cost $440+ installation). LLR tires will likely bump your overall fuel efficiency by about 2-4 mpg.
......

To increase your fuel efficiency try driving at a slower speed and select routes with fewer stop signs and stop lights which allow you to drive slower than 50 mph.
......

Another mod that can be helpful in getting better fuel efficiency is a ScangaugeII ($140) which plugs into the OBDII port underneath the steering column and tells you when the engine is running at its most efficient mode.



[Edited by: drydem at 8/7/2014 6:21:46 AM EST]
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WEPSMAN
Champion Author South Dakota

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Message Posted: Aug 6, 2014 8:32:01 PM

Nope
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redfish67
Champion Author Dallas

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Message Posted: Aug 6, 2014 10:14:15 AM

no
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dassfg
Champion Author Fort Worth

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Message Posted: Aug 6, 2014 8:16:37 AM

My diesel pickup has a grill shutter action to adjust to conditions as needed
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GLM4205
Champion Author Toledo

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Message Posted: Aug 6, 2014 5:51:22 AM

No
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randy3116
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Message Posted: Aug 6, 2014 5:41:41 AM

no
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nickless
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Message Posted: Aug 6, 2014 4:09:02 AM

no
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jl1rp
Champion Author New Hampshire

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Message Posted: Aug 5, 2014 12:37:50 AM

no
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PaylessKY
Champion Author Kentucky

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Message Posted: Aug 4, 2014 10:57:31 AM

No
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BCNU
Champion Author British Columbia

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Message Posted: Aug 4, 2014 1:30:50 AM

no
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jorobins538
Champion Author Chicago

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Message Posted: Aug 1, 2014 10:00:48 AM

sounds like a lot of work for not much benefit. How abbout just buying a car with better mileage to start with?
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GLM4205
Champion Author Toledo

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Message Posted: Aug 1, 2014 6:05:17 AM

NO
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8_Ball2014
Veteran Author North Dakota

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Message Posted: Aug 1, 2014 3:51:41 AM

no
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GBMAX
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Message Posted: Aug 1, 2014 2:34:54 AM

no
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ricebike
Champion Author New Jersey

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Message Posted: Jul 31, 2014 8:28:36 PM

I only see grill blocks on diesels. Not on gas powered vehicles
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Jackson126
Veteran Author Virginia

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Message Posted: Jul 30, 2014 3:32:40 PM

No
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dontuknowOH
Champion Author Ohio

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Message Posted: Jul 29, 2014 9:50:14 AM

There are so many types of material available today on the market that I might DIY a newer version for my present vehicle. Swinging door style, maybe shutter blind, flapper valves, louver shunt or rollup blind blocker.

Seems I can't make up my mind, will check on my inventory of supplies, later..... No used mopar stuff on my vehicle yet Woops! delco what's that.... Right now I need 3 water mister orifices (nozzles....& filter.

Sal30 your less a ning of your wheel dynamic weight mass will offer less torque needed at the drive axles each time you start motion in the lower gear. Small savings each time you start motion.I think they make an indoor antenna windshield wire for signal pick-up, rain water repel washer additive, duct tape for areas where coolant air flow doesn't breathe, be careful on that.....micro managing fuel savings(works over long term often!
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twt
Champion Author Virginia Beach

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Message Posted: Jul 29, 2014 5:11:12 AM

A waste of money.
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BCNU
Champion Author British Columbia

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Message Posted: Jul 29, 2014 3:30:34 AM

no
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OilerFan
Champion Author Tulsa

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Message Posted: Jul 27, 2014 11:58:21 AM

I wouldn't bother with grill blocks.
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contiki
Champion Author Ontario

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Message Posted: Jul 27, 2014 7:30:38 AM

Never.....
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dassfg
Champion Author Fort Worth

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Message Posted: Jul 25, 2014 8:20:55 AM

My Ram 1500 Eco-Diesel has automatic grill shutters that adjust for fuel economy
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Dennis783
Champion Author Des Moines

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Message Posted: Jul 25, 2014 7:37:30 AM

nope.
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hoopitup2000
Champion Author Virginia

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Message Posted: Jul 23, 2014 6:52:09 AM

Only in the winter
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RalphHightower
Champion Author South Carolina

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Message Posted: Jul 23, 2014 6:08:06 AM

no
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pt1KY
Champion Author Lexington

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Message Posted: Jul 22, 2014 8:59:21 PM

no
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contiki
Champion Author Ontario

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Message Posted: Jul 20, 2014 7:07:44 AM

Never.....
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dontuknowOH
Champion Author Ohio

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Message Posted: Jul 19, 2014 9:59:34 AM

My understanding of the use for Grill Blocks for the average modern vehicle is; The blocking is designed to aid in controlling the engines peak operating efficient economy normal engine compartment temperatures.

More stable, quicker intervals of stable, that are near peak efficiency engine temps, against no matter what exterior degrees are available, but during whatever outside weather conditions are.

Engines simply run and get more energy out of each drop of fuel mix when they are running within the correct thermal designed operation range of controlled temps as designed. Ultimate expansion pressure derived(goal).

Restarts, fresh cold starts, any type other than continuous running even idle requires a certain % of fuel boost along with performance increased engine loads(operation speed).

Human's core heat temps. V/S engine's core heat, well no logical realistic comparison, cabin heat, yes correlates with Human comfort.

Grill Blocks can have another advantage, like a boost in styling and a possible aerodynamics benefit for MPG. savings at moderate/higher travel speeds.
They must have quality control by the designers for preventing any Engine compartment overheat of the vehicle also, depending on the ECM Boss on modern vehicles. The blocking devices work along with the engines cooling system to prevent any overheat damage. Just my take......
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contiki
Champion Author Ontario

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Message Posted: Jul 19, 2014 7:38:41 AM

Never...........
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ggg452
Champion Author Manitoba

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Message Posted: Jul 17, 2014 10:29:47 AM

No...
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HideMKE
Champion Author Milwaukee

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Message Posted: Jul 17, 2014 9:21:18 AM

no
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Floridaman2013
Champion Author Florida

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Message Posted: Jul 17, 2014 7:58:23 AM

Steel wheels would work to some degree but would not use any grill block, especially in LA.
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hoopitup2000
Champion Author Virginia

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Message Posted: Jul 17, 2014 6:42:24 AM

No grill blocks in the summer. Though work well during the colder months.
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MertieMan
Champion Author Lexington

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Message Posted: Jul 17, 2014 6:21:19 AM

And you are thinking of overheating your engine in the process also.
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