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Old 10-04-2013, 10:02 AM   #31 (permalink)
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Quote:
Originally Posted by ron22 View Post
Have you ever looked real close under your Jetta or Golf? VW did a lot of work under there to streamline it. There are a lot of little plastic pieces that deflect air over/around parts. There is one in front of the rear axle and a few others. I think a full belly pan is better.
Agreed. I was able to tuck brake cables up and really smooth the underside if my car.

I have noticed that little spoiler ahead of the rear axle on my wife's 2011 A3 TDI. I have wondered if removing it and installing a belly pan to the rear of her car would be better. FWIW the Mk IV doesn't have that same plastic deflector. The newer VW/Audis have a lip that turns down just before the rear axle. In the pic Ron posted you can see that on the Mk IV it is flush with the axle.

Ron, what year is your TDI?

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Quote:
Originally Posted by freebeard View Post
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.

Last edited by COcyclist; 10-04-2013 at 12:56 PM..
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Old 10-04-2013, 11:01 AM   #32 (permalink)
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Mine is a 2002 built 2/02
Here is a picture of the side shields on the belly pan

Red arrow points to side shield. Yellow arrow the aluminum belly pan. Blue arrow is the inner fender liner.
I do not like how inner fender liner is open to the bumper cover. Need to add shield like you guys did.

I have the plastic piece before the rear axel

Red arrow points to the plastic piece
Yellow arrow points to rear axel
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Old 10-04-2013, 02:40 PM   #33 (permalink)
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Yep, I have the same plastic shields in the rear of mine. Ron didn't point it out in the pic, but there is also a plastic deflector in front of the rear spring & shock area... can kind of see in his pic on the right towards the bottom.
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Old 10-04-2013, 06:04 PM   #34 (permalink)
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Yea I forgot about the plastic on the springs.
Car was not in the air I just stuck cam under and took pictures so not the best
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Old 10-07-2013, 11:06 AM   #35 (permalink)
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Quote:
Originally Posted by NachtRitter View Post
Ron didn't point it out in the pic, but there is also a plastic deflector in front of the rear spring & shock area... can kind of see in his pic on the right towards the bottom.
I suspect that may be for rocks and debris as much as for managing airflow but that is just my opinion. My raingutter diffuser starts flush with the spring shield to guide the air out the back of the car to help fill the wake.

Does this thread need a new title?
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Quote:
Originally Posted by freebeard View Post
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.

Last edited by COcyclist; 10-08-2013 at 12:02 PM..
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Old 10-07-2013, 12:13 PM   #36 (permalink)
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Good idea! "MkIV Jetta aerodynamics" or something to that effect...

EDIT: Oops, didn't mean to leave out the Golf! "MKIV VW aeromods" maybe...

Last edited by NachtRitter; 10-07-2013 at 03:20 PM..
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Old 10-07-2013, 04:05 PM   #37 (permalink)
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i would like to see this thread read "MKIV VW aeromods" if possible.
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Old 10-07-2013, 06:38 PM   #38 (permalink)
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Quote:
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i would like to see this thread read "MKIV VW aeromods" if possible.
Turning into a nice build sheet.
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Old 10-07-2013, 10:51 PM   #39 (permalink)
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did this today. resting voltage after sitting 4 days. this would have been useful when i was having battery problems. purchased from the bay for $5.00, installed in an empty slot, tied into a key on fuse.
key off, flash on,

key on, flash on,

key on, flash off,

little closer,

haven't turned on the engine yet but will see in the morning.
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Old 10-11-2013, 07:43 PM   #40 (permalink)
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gauge is working great. had the idea for as long as ive had the car and im glad it worked.
my next tank is going to be measured driving 55 mph and speed will not adjusted for road conditions. i want to get a baseline at that speed. after i get this stretch of work days over with i will be concentrating on getting the rear wheel skirts, LED DRL's and smooth wheel covers installed.
my mods are paying off so far, being a government employee and not knowing when i will get paid, the mileage im getting and the cost of fuel has not been that big of an impact on us compared to others ive talked to.

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