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Old 09-14-2019, 01:12 PM   #1 (permalink)
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Join Date: Sep 2019
Location: Portugal
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Golf - '99 VW Golf Mk4
90 day: 51.37 mpg (US)
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Hi

I'm the proud owner of a VW Golf Mk4 TDI, want to improve it to achieve better fuel economy.

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Old 09-14-2019, 01:56 PM   #2 (permalink)
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Join Date: Dec 2007
Location: Germantown, WI
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CM400E - '81 Honda CM400E
90 day: 58.68 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
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Welcome to the site. It looks like you're already getting some pretty decent fuel economy with your Golf. What kind of goal are you looking to achieve?
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Old 09-14-2019, 02:55 PM   #3 (permalink)
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Join Date: Sep 2019
Location: Portugal
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Golf - '99 VW Golf Mk4
90 day: 51.37 mpg (US)
Thanks: 6
Thanked 7 Times in 7 Posts
Thanks.

I would like to get at least something like 4L/100km (~60MPG) at 110km/h it would be awesome. Engine ECU is already tuned, there isn't much to squeeze there. Air-conditioner compressor internal control valve is modified to slightly higher suction and lower head pressure.

Now I was thinking mostly in stealth aero mods, like dams or flat under body.. but don't know where to start.
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Old 09-14-2019, 03:43 PM   #4 (permalink)
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Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,020

CM400E - '81 Honda CM400E
90 day: 58.68 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
Mitsubishi
90 day: 56.69 mpg (US)
Thanks: 2,339
Thanked 2,417 Times in 1,462 Posts
This is a great place to start:

https://ecomodder.com/forum/fuel-eco...ifications.php
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Old 09-20-2019, 12:39 AM   #5 (permalink)
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Quote:
Originally Posted by jorgemiguel4 View Post
Now I was thinking mostly in stealth aero mods, like dams or flat under body.. but don't know where to start.
I was told it's harder to certify the compliance of some mods in Portugal than in Spain. But anyway, if you're considering some discrete aero mods, what about a grille block? Besides improving the aerodynamics on highway, it may lead to the engine reaching its optimum temperatures quicker.

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