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Dizono 01-03-2020 04:43 AM

The Dutch 100MPG(?) Peugeot 106
Hi All,

Years ago I stumbled upon this website and the idea of eco tuning a car stuck. Together with a friend, we finally found a good reason to do it. For a major Dutch magazine, we're investigating how much more efficient a current petrol car can be when we do some compromises to design and comfort.

The original car is a Peugeot 106 1.1 with 60 hp and a factory consumption of about 1l per 16.5 km (around 39MPG). We want to improve this with at least 100%, so around 80 MPG, but we're hoping 100 MPG might be possible to.

So far, we've stripped about 55 kg (not much effect) and added that weight with a durable tail section. Nice detail: we can still use the tailgate, the entire tail section can flip open. The rear wheel covers can be removed. All the parts are hand made in steel and aluminium. The plastic rear panel is temporarily, we want to make that out of aluminium as well, with nicer led lights.

Next on the list is making a new front bumper out of aluminium and covering as much of the underside as possible. We also have some Renault Twizy tires and we want to shape the front quarter panels like the Peugeot Vera Concept from the early 80s. No idea if it really helps, but it looks cool.

Of course we want to do better than this car...

If anyone has some great tips for further improving the economy..? Let me know!

Frank Lee 01-03-2020 09:47 AM

Nice workmanship! :thumbup:

ptitviet 01-03-2020 12:22 PM

Looks awesome :). I wish such boattails would be legal on cars.
Another gain possibilty would be to work on a powertrain efficiency. I drove a 1.1 106 long time ago and the revs are quite high on freeway. With such reduced aerodynamic drag if you want to enjoy the result you'll have at least to reconsider gearing.

teoman 01-04-2020 02:03 PM

Trya a warm air intake

basjoos 01-04-2020 07:28 PM

You could add a rounded nose to lower the stagnation point at the front of the car with an incorporated adjustable grill inlet to control the amount of cooling air flowing through the radiator. Position the opening to the grill inlet below the stagnation point on the rounded nose. Could also install front wheel covers and a wind deflector for the windshield wipers. Is there any reason you couldn't extend the boat tail to a smaller cutoff point?

Dizono 01-05-2020 08:15 AM

We've thought about that, but a computional fluid dynamics model suggests that a further extension has only minimal gains. So Wunibald Kamm was right :D

It also shows that further improvements mainly come from the front and the transistion from windscreen to roof. That last one might be a tricky one, but the right shape of 'wind screen wiper shield' might help to shape the flow in such a way that it creates a more efficient flow over the car.

jimhs 01-05-2020 10:34 AM

Nice work!
Any mpg results so far?
Have you got any pics of the facial of the car!

Dizono 01-06-2020 05:18 AM

No, unfortunately, due to the extensive lowering of the car (about 3 cm's at front, about 5 in the back), one of the driveshafts is nearing end of life. So that needs to be replaced first. Mind that this is a hobby project, it's not our daily driver, so we'll work on this in our spare time.

Another thing we've done so far: making camera mirrors based on 20 dollar rear view camera's from AliExpress. The housing is made of the interior part of the mirror housing and some plywood an lots of filler.

Good thing about these camera's is that you can choose weather you want a normal or mirrored view. That last option makes looking at the monitors more natural.

elhigh 01-13-2020 09:04 AM

That thing looks amazing. The sheet metal is just glorious, making it an operable hatch is even better.

cRiPpLe_rOoStEr 01-14-2020 01:02 PM

That's an interesting project to say the least. When it comes to the boat-tail, have you never considered to make it out of some plexiglass or other plastic in order to improve rear visibility and maybe getting the taillights in a position that would allow a lower drag?

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