What is the largest % you have seen from aeromods alone ? - Fuel Economy, Hypermiling, EcoModding News and Forum

Cd · 11-02-2012, 09:14 PM

What is the largest % you have seen from aero-mods alone ?
Without engine off coasting or other tricks, how much FE increase have you guys gained from your aeromods ?

I'm not comfortable EOC, ( i can't anyways - it's an auto ) so I was just curious what kind of gains can be had from aeromods alone.

I know the question is very general and would vary greatly from vehicle to vehicle, but i was hoping i could get some response from some of you guys that have done serious aeromods with your cars.

Also, I have asked this question several times in the past, but haven't seen it in a dedicated thread that i remember.

JRMichler · 11-03-2012, 01:32 PM

I've never even tried to separate that out. Much of the benefit from aeromods comes from increased used of EOC.

I read somewhere (Hucho ?) that, in production vehicles, half the benefit from aero improvements comes from changes in engine size and transmission ratios.

Arragonis · 11-03-2012, 02:10 PM

You could compare the Aerocivic before and after to get an idea of the difference - the guy was hypermiling before and after so it is the same "techniques" being used, albeit adjusted for that car having improved aero (e.g. longer coasts)

Cd · 11-03-2012, 07:11 PM

Thanks Arragonis, but I can't engine off coast in my car, so I'm just curious to see what i could expect if i aeromodded my car and drove normally.

The largest increase i have seen is Phils' ( Aerohead ) truck that dropped from .44 down to .153 and gained around ten or so miles per gallon .

So if I drop my stock Cd of .31 down to AeroCivic numbers* ( .17 ? ) then i can expect a averaged gain of a how many miles per gallon without EOC ? I can usually get around 40 - 44 MPG on long highway trips with no stops, so perhaps i could crack 50 MPG ?

From what Phil had said in a previous post, it looks like i could gain maybe six or seven mpg tops, but then i see that 3 Wheeler gained nearly 10 mpg with his boattail addition, and this was on a car that had a lot less wake than the car that i have, and the test consisted of freeway driving with no EOC ( I'm assuming )

So a little confused here.

( * BTW, Me and Basjoos have the exact same car, but mine is automatic. )

Cobb · 11-03-2012, 07:28 PM

Good question. I wasnt able to break 100 mpg til I removed my passenger side mirror and gut all teh unnecessary crap inside. Before hand it would be between lowering and gril lblocking. Blocking the whole front end I say yields the most and improved acceleration at and above highway speeds.

Sven7 · 11-03-2012, 07:51 PM

I did just this on my 400 mile trip with the Probe. Just driving steady 60mph, coasting down any really big hills. Passing people, not drafting.

EPA: 28 MPG hwy

Actual: 41 MPG hwy
Actual (rain): 34 MPG hwy

46% gain. The car is heavily aero-modified.

Then again with full hardcore hypermiling...

P&EOC no boattail: 45 MPG hwy (60% gain hwy)

Cd · 11-03-2012, 09:29 PM

If i could gain 46% over the cars stock 42 MPG highway rating, that would mean about 60 MPG ?

That sounds pretty nice !

MPGranger · 11-03-2012, 09:47 PM

how about the centurion? Now, that was a serious ecomod

128-mpg Diesel-Powered Sports Car

MetroMPG · 11-03-2012, 10:31 PM

Cd, WHY are you still debating this??

What are you waiting for! Start modding!

Sven7 · 11-04-2012, 12:52 AM

Quote:

Originally Posted by Cd

If i could gain 46% over the cars stock 42 MPG highway rating, that would mean about 60 MPG ?

That sounds pretty nice !

The boat tail cost at least $500 and three weeks. Just keep that in mind for ROE. It might be harder to see gains as your FE gets better, too. Do it and find out!