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Old 08-10-2021, 03:54 AM   #1 (permalink)
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Espace 3

My target is lower consuption for speeds 80 - 95 mph. Consuption varies 29.4 - 23.5 mpg. Lower is typical Normandy hilly region.

Under view rear axle and tyre ( url photos.app.goo.gl/EQFnLer3jerSukSp8 )



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Old 08-10-2021, 09:42 AM   #2 (permalink)
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Quote:
Originally Posted by maanma View Post
My target is lower consuption for speeds 80 - 95 mph. Consuption varies 29.4 - 23.5 mpg. Lower is typical Normandy hilly region. ...
Did you mean KPH? If not and you mean MPH, why so fast? Your easiest and most cost effective mod will simply be to slow down a little. Aerodynamic drag increases fast per than speed. Stay under 80 and you'll definitely see fuel economy benefits...

Assuming you can't or won't slow down. A rear difuser for that underside is an idea, but you will want to design and test it before you settle on a shape. Keep it smooth (no fins) and measure the angle of the difuser precisely if possible.

What kind of car is this?
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.



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Old 08-10-2021, 10:15 AM   #3 (permalink)
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Quote:
Originally Posted by California98Civic View Post
Did you mean KPH? If not and you mean MPH, why so fast? Your easiest and most cost effective mod will simply be to slow down a little. Aerodynamic drag increases fast per than speed. Stay under 80 and you'll definitely see fuel economy benefits...

What kind of car is this?
We travel long distances on highways with this car. Typically 1500 miles in two days. That is why we are keeping speed and why aerodynamics is very important.

With 4 bike bike rack behind is 19 ft long, but only five and half feet tall.

Factory built engine and body is optimized for 80 mph (130 km/h).

It is a 7 seat MPV built on protective special steel frame from glass fiber. Second and third row seats are easily removed. In Grand model there is 2 ft trunk space behind last line.

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Old 08-10-2021, 02:01 PM   #4 (permalink)
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If you're getting 30 MPG at 80 MPH, it's already not too shabby.
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Old 08-10-2021, 07:40 PM   #5 (permalink)
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What kind of car is this?
Basically, had the Chevrolet Lumina APV been designed in France, would be just like the 3 earliest generations of the Renault Espace.
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Old 08-10-2021, 08:39 PM   #6 (permalink)
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Closest France got to the Previa.
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Old 08-11-2021, 01:07 AM   #7 (permalink)
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Quote:
Originally Posted by maanma View Post
We travel long distances on highways with this car. Typically 1500 miles in two days. That is why we are keeping speed and why aerodynamics is very important.

With 4 bike bike rack behind is 19 ft long, but only five and half feet tall.

Factory built engine and body is optimized for 80 mph (130 km/h).

It is a 7 seat MPV built on protective special steel frame from glass fiber. Second and third row seats are easily removed. In Grand model there is 2 ft trunk space behind last line.
This is the car?



If so, in addition to a full undertray, see if you can keep the four bikes on the back rack within the frontal area of the van, oras close as possible. If they are sticking out into the flow, they may be a little like a parachute.

I agree with freebeard, though, 30 mpg at 80mph with four bikes hanging off the back? Amazing really.

Are those US or UK miles?
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__________________
See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.



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Old 08-11-2021, 03:28 AM   #8 (permalink)
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Grand Espace travel ship - '01 Renault Grand Espace
90 day: 26.56 mpg (US)

107 city slider - '10 Peugeot 107
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Thanks: 10
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Quote:
Originally Posted by California98Civic View Post
This is the car?

I agree with freebeard, though, 30 mpg at 80mph with four bikes hanging off the back? Amazing really.

Are those US or UK miles?
Car in these images is base model. I have Grand Espace which is about 1 ft longer.

I agree that loaded consumption is amazing in that 80 mph speed. But when you look under belly pan can achieve more. I would say 12-15% savings.

I try to give all values mph mpg in US version with calculators.
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Old 08-11-2021, 12:50 PM   #9 (permalink)
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Black and Green - '98 Honda Civic DX Coupe
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Thanks: 2,373
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Quote:
Originally Posted by maanma View Post
... But when you look under belly pan can achieve more. I would say 12-15% savings. ...
Maybe that much improvement is possible, I don't know. It would depend on how you execute. Are looking only at the underside, or are you willing/able to be more open about mods? How about rear wheel well skirts? Or a box cavity fairing at the rear to reduce the wake and maybe "hide" the bikes from the airflow? These would need to be tuned, as research has shown that box cavities, wheel well skirts, and undertray difusers interact and significantly change each other's performance when used together and in various combinations. (Don't let me talking like that confuse you as to my expertise... I have no formal engineering or aerodynamics training. I am a hobbyist.)
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.



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Old 08-13-2021, 10:52 PM   #10 (permalink)
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Quote:
Originally Posted by freebeard View Post
Closest France got to the Previa.
Europeans even got the 1st-generation Previa with a 3C-T or 3C-TE turbodiesel and a 5-speed manual transmission.

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