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Search took 0.11 seconds. Search: Posts Made By: khafra
Forum: Aerodynamics 07-20-2011, 12:34 PM
Replies: 23
Views: 7,097
Posted By slowmover
I could potentally add a partial grill block to...

I could potentally add a partial grill block to the lower grill, even under worst case desert heat conditions and maintain proper temps.

Will speak to the obvious here:

Testing will need to...
Forum: Aerodynamics 07-20-2011, 05:00 AM
Replies: 13
Views: 2,730
Posted By euromodder
Depends on the relative tunnel and vehicle size -...

Depends on the relative tunnel and vehicle size - and on it being uni- or bi-directional.

Biking in a tunnel (4m / 13' wide) is a dream, even on the gentle uphill part.
Tunnels, walls, and...
Forum: Aerodynamics 07-19-2011, 09:49 AM
Replies: 23
Views: 7,097
Posted By Diesel_Dave
Cool! Can you post a link to the Youtube video? ...

Cool! Can you post a link to the Youtube video?

In theory, yes, you would ideally want to run differently in the cold, etc. However, If you have a simple, robust, mechanical solution that is...
Forum: Aerodynamics 07-19-2011, 12:32 AM
Replies: 23
Views: 7,097
Posted By graydonengineering
Lightbulb Automatic grill shutter prototype

After a great deal of hard work, I have a working prototype for an automatic grill shutter device that fits behind the upper gill opening of my Nissan Frontier. I made a video of the device in action...
Forum: Aerodynamics 07-13-2011, 10:26 PM
Replies: 9
Views: 1,248
Posted By NeilBlanchard
SketchUp "likes" nVidia cards, but ATi work fine...

SketchUp "likes" nVidia cards, but ATi work fine as well. It needs a lot of RAM on the video card, if the model gets past a certain number of polygons. My video card has just 256MB of RAM and at a...
Forum: Aerodynamics 06-23-2011, 10:39 PM
Replies: 101
Views: 45,201
Posted By InsightfulRay
Here you go. These are all after installation of...

Here you go. These are all after installation of the Airtabs. Again, apologies for the sloppy format:

6/1/2011 424 9.1 46.593406593407
6/7/2011 488 10.1 48.316831683168
6/7/2011 476.5 ...
Forum: Aerodynamics 06-22-2011, 09:52 PM
Replies: 101
Views: 45,201
Posted By InsightfulRay
Here's the poop on the 3 tanks prior to...

Here's the poop on the 3 tanks prior to installation of the airtabs. Sorry for the sloppy format. Wasn't sure how to attach a tab-delimited file from a spreadsheet. First column is date of fill, 2nd...
Forum: Hypermiling / EcoDriver's Ed 06-22-2011, 04:12 PM
Replies: 24
Views: 10,514
Posted By slowmover
You're welcome. My Dad started driving in 1939...

You're welcome. My Dad started driving in 1939 and was one happy guy when he moved to Texas and could also afford a new car with a SEARS underdash A/C unit (a '54 Ford). From him I learned to "set"...
Forum: Aerodynamics 06-22-2011, 02:31 PM
Replies: 101
Views: 45,201
Posted By InsightfulRay
Got it. I'll dig around and post that data later...

Got it. I'll dig around and post that data later today. I used to have a '96 Passat TDI. Very nice car. Even had propane injection system added to it just for kicks. Love the newer TDI's.
Forum: Aerodynamics 06-22-2011, 02:14 PM
Replies: 101
Views: 45,201
Posted By InsightfulRay
For the math-challenged among us, by "data point"...

For the math-challenged among us, by "data point" do you mean "#gals consumed for miles driven". Second, your point #2 mentions "tab up". As I stated, those suckers are on to stay and I'm not about...
Forum: Aerodynamics 06-17-2011, 09:47 AM
Replies: 14
Views: 7,531
Posted By Piwoslaw
Without a bellypan to keep the airflow smooth,...

Without a bellypan to keep the airflow smooth, the rear diffuser cannot be "good". It's purpose is to gently guide the airflow, which won't happen if it is sitting in a bunch of turbulence and there...
Forum: Aerodynamics 06-16-2011, 06:29 PM
Replies: 34
Views: 12,056
Posted By some_other_dave
They did all kinds of things with the 935 once...

They did all kinds of things with the 935 once they picked through the rule book. Like they found they could raise the floor (originally written in so front-engine cars could pass the exhaust pipe...
Forum: Hypermiling / EcoDriver's Ed 06-16-2011, 12:00 PM
Replies: 57
Views: 7,624
Posted By UFO
Because most people obey the limit most of the...

Because most people obey the limit most of the time, and they end up stopping at every light. It's very frustrating. In my area, for one route the only way to hit a string of lights is to exceed...
Forum: Hypermiling / EcoDriver's Ed 06-15-2011, 01:12 PM
Replies: 24
Views: 10,514
Posted By slowmover
You can also "up" the performance of an A/C...

You can also "up" the performance of an A/C system by bypassing the heater core, even if for just the summer months. Where I live an A/C system in a car is not optional, and it runs 9-10 months...
Forum: Hypermiling / EcoDriver's Ed 06-14-2011, 06:00 PM
Replies: 57
Views: 7,624
Posted By larrybuck
With an older VW Diesel, an easy bumper sticker...

With an older VW Diesel, an easy bumper sticker could be: WARNING: 0-50mph in 3 yrs.!!

"I'm happy U are employed to drive faster$$"

Happy to drive faster for $$$

Sorry! the squirrels...
Forum: Aerodynamics 06-14-2011, 08:18 AM
Replies: 167
Views: 87,700
Posted By wwkayaker
Put the spring to where it is pushing back...

Put the spring to where it is pushing back towards the car on the top side with the bottom side being the part that swings against the air movement. I will try to draw it for you but I only have the...
Forum: Hypermiling / EcoDriver's Ed 06-14-2011, 06:14 AM
Replies: 57
Views: 7,624
Posted By appuchan
How to accept anger from other drivers. ...

How to accept anger from other drivers.

Interesting. It will be good to have some device to convert the anger into electrical energy and charge some battery bank which will help you to save some...
Forum: Aerodynamics 06-11-2011, 05:30 PM
Replies: 34
Views: 12,056
Posted By TimJFowler
Was it this one? File:Porsche RSR am...

Was it this one?

File:Porsche RSR am 19.05.1974.jpg - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/File:Porsche_RSR_am_19.05.1974.jpg)
Forum: Hypermiling / EcoDriver's Ed 06-11-2011, 04:10 PM
Replies: 57
Views: 7,624
Posted By actwithclarity
Driving fast can be fun because it optimizes...

Driving fast can be fun because it optimizes time, because high speeds require more focus, and as a way to show off your driving skills.

Hypermiling wastes the resource of time. So let's not be...
Forum: Aerodynamics 06-11-2011, 03:30 PM
Replies: 32
Views: 13,765
Posted By aerohead
Wink REAR SPOILERS: Length-'Angles'

There's been some interest in mods for notchback cars,especially rear spoilers.
I've gone back in time,looking over early wind tunnel investigations and will share the following.If you have any of...
Forum: Hypermiling / EcoDriver's Ed 06-11-2011, 02:36 PM
Replies: 57
Views: 7,624
Posted By Arragonis
My ex-boss (circa 1997) would occasionally "push"...

My ex-boss (circa 1997) would occasionally "push" the car in front mainly as an aid to it getting out of his way.

I did sit in his car once and he drove on the 'wrong' side of a 2 lane road for...
Forum: Hypermiling / EcoDriver's Ed 06-11-2011, 06:32 AM
Replies: 57
Views: 7,624
Posted By jakobnev
How about an URL printed on the back of your car...

How about an URL printed on the back of your car that people can go to from their smartphones and pay for your gas? In return you go faster.

Maybe a tag that looks something like this:...
Forum: Aerodynamics 06-10-2011, 05:53 PM
Replies: 21
Views: 9,384
Posted By aerohead
Myth-Busters

Vekke,did you happen to catch the Myth-Busters episode in which they tested pickups for tailgate up/down fuel economy?
In that episode they constructed a simple 'atmospheric' open-top water tunnel...
Forum: Aerodynamics 06-10-2011, 11:12 AM
Replies: 15
Views: 4,083
Posted By Diesel_Dave
Skyking, I like your idea. I've thought a little...

Skyking, I like your idea. I've thought a little about doing something like that myself.

I think, ideally, it's much better to use intake temp and underhood temp for control as opposed to boost...
Forum: Aerodynamics 06-10-2011, 09:56 AM
Replies: 15
Views: 4,083
Posted By Piwoslaw
Weather Spotter has one. Iirc it's not automated...

Weather Spotter has one. Iirc it's not automated yet, but it is push-button operated:
Lower Grill block that can open and close...
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