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Search took 0.12 seconds. Search: Posts Made By: hat_man
Forum: EcoModding Central 08-18-2022, 12:04 PM
Replies: 9
Views: 1,523
Posted By aerohead
SAE Paper# 881874 and cab wings

https://ecomodder.com/forum/showthread.php/pickup-truck-aerodynamics-20744.htmlhttp://https://ecomodder.com/forum/member-aerohead-albums-book+illustrations-picture143-texas-tech-takes-pickups-into-win...
Forum: EcoModding Central 07-06-2020, 12:15 PM
Replies: 7
Views: 867
Posted By arcosine
Just do it. Expect mpg improvement about...

Just do it.

Expect mpg improvement about half the difference, 3.55 to 2.98 would be ((1-3.55/2.98/2)+1) *32=35 mpg.
Forum: EcoModding Central 07-05-2020, 10:53 PM
Replies: 7
Views: 867
Posted By California98Civic
Me-and-my-metro might be right; I don't know what...

Me-and-my-metro might be right; I don't know what a tone gear is. But I think you might need to adjust the speedometer and odometer signal after your swap. There are aftermarket products that can...
Forum: EcoModding Central 07-05-2020, 08:20 PM
Replies: 7
Views: 867
Posted By me and my metro
The tone ring in the differential will turn at...

The tone ring in the differential will turn at the same speed as your tires so no difference. You are only changing the ratio that your engine sees so you do nothing and the speedometer reads...
Forum: EcoModding Central 04-03-2020, 01:39 PM
Replies: 5
Views: 879
Posted By Vman455
Engine RPM = [MPH x (transmission gear ratio) x...

Engine RPM = [MPH x (transmission gear ratio) x (axle ratio) x (tire revolutions per mile)] / 60
Forum: Aerodynamics 07-28-2019, 12:30 AM
Replies: 26
Views: 5,116
Posted By freebeard
Review this: EcoModder Forum > EcoModding >...

Review this: EcoModder Forum > EcoModding > Aerodynamics > 'Fluid Tail' (https://ecomodder.com/forum/showthread.php/morellis-fluid-tail-33283.html)
...
Forum: Aerodynamics 07-27-2019, 04:30 PM
Replies: 24
Views: 3,619
Posted By aerohead
cancelling

You're describing the D'Alembert paradox,from long ago,before boundary layer theory was known.D'Alembert figured that there'd be as much pressure at the rearward stagnation point as at the frontal...
Forum: Aerodynamics 07-27-2019, 12:47 PM
Replies: 24
Views: 3,619
Posted By aerohead
squeeze it forward

The energy lost to surface friction removes energy at the rear of the car,which is present at the front.So it's impossible to generate thrust.All you can do is eliminate any separation,and as the...
Forum: Aerodynamics 07-25-2019, 04:33 PM
Replies: 24
Views: 3,619
Posted By freebeard
You asked for other threads:...

You asked for other threads: ecomodder.com/forum/google_search_results for q=skin+friction...
Forum: Aerodynamics 07-24-2019, 08:20 PM
Replies: 24
Views: 3,619
Posted By Vman455
No--that would be impossible, since you would be...

No--that would be impossible, since you would be getting more energy out of the system than you put into it. But yes, after the flow goes over the top of the car, it accelerates over the shoulder...
Forum: Aerodynamics 07-24-2019, 10:58 AM
Replies: 24
Views: 3,619
Posted By aerohead
ducting

It's impossible to recover more usable kinetic energy from internal,ducted flow,than from streamlined exterior flow. It violates the second law of thermodynamics,via skin-friction heating that would...
Forum: Aerodynamics 07-24-2019, 12:01 AM
Replies: 24
Views: 3,619
Posted By ChazInMT
You need to think a bit differently. If you have...

You need to think a bit differently. If you have a fan, and it moves air with a motor, it's pretty intuitive that the fan uses energy to make the air move, right? When a vehicle moves through the...
Forum: Aerodynamics 07-22-2019, 07:12 PM
Replies: 24
Views: 3,619
Posted By Frank Lee
We've been down that road before. IMHO if...

We've been down that road before.

IMHO if you have the space to spare for a duct you are better off chopping the top and reducing frontal area. Ducts have drag too. Think surface area. Ducts...
Forum: EcoModding Central 07-06-2019, 12:44 AM
Replies: 11
Views: 2,139
Posted By 19bonestock88
A tune would work wonders on your truck. Not only...

A tune would work wonders on your truck. Not only for correcting the fuel tables for the 12 hole injectors, but for allowing a clutch fan delete and altering fuel/timing to give better mileage...
Forum: EcoModding Central 07-01-2019, 08:58 AM
Replies: 11
Views: 2,139
Posted By ksa8907
Do you know the fuel rail pressures that those...

Do you know the fuel rail pressures that those flow rates are set at? If your ranger is flowing 18#/hr of fuel at maybe 40psig while the 12 hole injectors are flowing 23#/hr at 60psig, then they're...
Forum: EcoModding Central 07-01-2019, 04:59 AM
Replies: 11
Views: 2,139
Posted By Ecky
If the ECU doesn't make a long-term fuel trim...

If the ECU doesn't make a long-term fuel trim adjustment (or the adjustment isn't quite enough), every time you change throttle position it will swing rich until the O2 sensor has a chance to...
Forum: EcoModding Central 06-30-2019, 03:20 PM
Replies: 11
Views: 2,139
Posted By California98Civic
Agree with 2000mc. Despite adjusting fuel trim,...

Agree with 2000mc. Despite adjusting fuel trim, the ecu will still know the fueling is out of spec and "broken" and so the CEL will stay lit. Check your Illinois smog test rules. If like Cali, then a...
Forum: EcoModding Central 06-30-2019, 12:48 PM
Replies: 11
Views: 2,139
Posted By 2000mc
I don’t have much Ford specific experience,...

I don’t have much Ford specific experience, mainly Gm. A lot of vehicles seem to be able to adjust the long term fuel trim +/- 25% and short term +/- 25%. Problem is I think most will set a rich or...
Forum: Fossil Fuel Free 05-16-2019, 04:23 PM
Replies: 139
Views: 13,309
Posted By Hersbird
There is no power in simple fair taxing. You also...

There is no power in simple fair taxing. You also don't get to pit groups against each other. The way we have it now you let groups form and then lobby for a special carve out. Then that group can...
Forum: EcoModding Central 05-13-2019, 07:09 PM
Replies: 27
Views: 3,319
Posted By Vman455
This whole thing is a red herring anyway. More...

This whole thing is a red herring anyway. More than 80% of Illinois' road funding comes from federal grants, and EVs aren't the reason for the shortfall.
Forum: Aerodynamics 04-11-2019, 03:39 PM
Replies: 63
Views: 8,596
Posted By kach22i
I'm thinking Hat-Man's questions are academic and...

I'm thinking Hat-Man's questions are academic and not a literal design proposal, yes?

I would do either the yellow line level cover or the red line level but not both at the same time.

The...
Forum: Hypermiling / EcoDriver's Ed 03-31-2019, 08:50 PM
Replies: 33
Views: 9,237
Posted By Vman455
We can simplify this problem a bit and attach...

We can simplify this problem a bit and attach some actual numbers using the Work-Kinetic Energy Theorem to get a general idea if it's worth rolling through or not. Assuming a weight of 1850 kg (the...
Forum: Hypermiling / EcoDriver's Ed 03-26-2019, 12:56 PM
Replies: 33
Views: 9,237
Posted By mpg_numbers_guy
If I can conserve enough momentum to stay out of...

If I can conserve enough momentum to stay out of 1st gear at intersections without dropping the RPMs below idle, gas is saved. Seems pretty simple.
Forum: Aerodynamics 09-22-2018, 04:34 PM
Replies: 63
Views: 8,596
Posted By aerohead
50%

GM,who patented the half-tonneau, illustrated their drag curve as a function of cover length,and you can see that the drag minimum occurs when the length is 50%.So yes,it really is a 'half' tonneau....
Forum: Aerodynamics 09-22-2018, 02:45 PM
Replies: 63
Views: 8,596
Posted By aerohead
thrust

*Without the tonneau cover,there's nothing but turbulence back there.All the kinetic energy is lost forever,and there's no chance for any re-attachment.A lot of drag and a lot of lift.
*The tonneau...
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