[lucaq]

Does anyone out there make an underbody plate for the A2 golf/jetta for aerodynamics. Anyone here added the sound deadener plate from an A2 diesel to their gasoline A2? From any other car?
Our cars have more to gain from a smooth underbody than from a wing or spoiler as far as aerodynamics are concerned, i assume that some company or VMS has made one at some point in time. Any pics?

 

[16v]

Re: who makes aerodynamic underbody plate for A2? (lucaq)

Autotech carried one back in the day that worked in conjunction withe a front spoiler

 

[130_R]

Re: who makes aerodynamic underbody plate for A2? (16v)

There is soo much more that can be done to the suspension before needing to look at aero pieces for an A2. If you want to build an aero part though, a front diffuser is the place to start.

 

[lucaq]

Re: who makes aerodynamic underbody plate for A2? (130_R)

quote:[HR][/HR]There is soo much more that can be done to the suspension before needing to look at aero pieces for an A2. If you want to build an aero part though, a front diffuser is the place to start.[HR][/HR]​

So much more? More that can be done to MY car?
I just wanted to know if they existed and who make them/sells them, i did not necessirally want to put one on my car. Like i said, an underbody plate would help aero wheras a wing will hurt aerodynamics. I have never even seen one so i wanted to see one/hear about them and how the fit/worked. This aero upgrade should help anyone also, not just people with suspension and diffusers...i bet that it helps fuel economy just as much as lowering the car. I would really like to know how it affected drag coefficient(CD).

 

[Harold]

Re: who makes aerodynamic underbody plate for A2? (lucaq)

Doug, the one that Autotech carries was a two piece kit consisting of a front spoiler and the underbody tray. I cannot think of who made it , but I remember reading something saying it increased the top speed by 10 kmh ( not sure).

 

[16v]

Re: who makes aerodynamic underbody plate for A2? (Harold)

quote:[HR][/HR]Doug, the one that Autotech carries was a two piece kit consisting of a front spoiler and the underbody tray. I cannot think of who made it , but I remember reading something saying it increased the top speed by 10 kmh ( not sure).[HR][/HR]​

ayup I remember that too. Or you can make your own like this:

 

[estus]

Re: who makes aerodynamic underbody plate for A2? (lucaq)

Tuning Zubehor has a skid plate to protect the oilpan/ tranny, if that's what you're talkig about. They cost $250, though http://****************.com/smile/emthdown.gif

 

[lucaq]

Re: who makes aerodynamic underbody plate for A2? (estus)

quote:[HR][/HR]Tuning Zubehor has a skid plate to protect the oilpan/ tranny, if that's what you're talkig about. They cost $250, though http://****************.com/smile/emthdown.gif [HR][/HR]​

Not what i am talking about. But that price ($250) is really not that bad (esp for the protection it provides...a stupid diesel A2 under engine sound deadener costs $450 new from the dealer...
Thax 16v for posting that pic, that is exactly what i am talking about...that one is dope!! I like the clear plastic, but i don't know that i would use it becuase it would get dirty etc, maybe smoked transparent would be better. (or neon yellow with a black light behind it to make it glow

HAHA!!)

 

[lucaq]

Re: who makes aerodynamic underbody plate for A2? (16v)

quote:[HR][/HR]

[HR][/HR]​

Man check out those kicks (AKA shoes) in tha reflection...i want some tight ass kicks like that

I just had to, that is so funny.

 

[G60Jetta2dr]

Re: who makes aerodynamic underbody plate for A2? (lucaq)

quote:[HR][/HR]There is soo much more that can be done to the suspension before needing to look at aero pieces for an A2. If you want to build an aero part though, a front diffuser is the place to start.
So much more? More that can be done to MY car?
I just wanted to know if they existed and who make them/sells them, i did not necessirally want to put one on my car. Like i said, an underbody plate would help aero wheras a wing will hurt aerodynamics. I have never even seen one so i wanted to see one/hear about them and how the fit/worked. This aero upgrade should help anyone also, not just people with suspension and diffusers...i bet that it helps fuel economy just as much as lowering the car. I would really like to know how it affected drag coefficient(CD).[HR][/HR]​

More power to ya lucaq you tell em. Thanks for starting this thread I have been thinking the same thing. http://****************.com/smile/emthup.gif

 

[MattTheFatCat]

Re: who makes aerodynamic underbody plate for A2? (lucaq)

Couldn't you make one? That's what I'd do. Beats spending $250 on $15 plexyglass.
EDIT: Well, I didnt see that 16v already said that

Crap...


[Modified by MattTheFatCat, 11:38 PM 2-11-2002]

 

[88Jetta]

Re: who makes aerodynamic underbody plate for A2? (16v)

quote:[HR][/HR]

[HR][/HR]​

hmmmmmmmmmm......... those don't look like stock suspension or chassis pieces..... is the "super rabbit" completed? Or at least further than the webpage shows?

 

[Jetta2dr]

Re: who makes aerodynamic underbody plate for A2? (88Jetta)

Thats this car here I believe. Its not to stock...

 

[aquabat911sc]

Re: who makes aerodynamic underbody plate for A2? (lucaq)

If you do something like the plexi tray you will want to combine that with exit vents in your hood. The air coming in through your grill and valence intakes needs to go somewhere and you blocking its exit with that plate.
This is a good idea, but undercar aerodynamics is a difficult thing to engineer. If you end up with too smooth an underbody you end up getting stagnent air which creates a high pressure area under the car(lifts it up) Companies that have completely flat bottom cars often end up putting in trip strips, and other various spoilers under the car to "trip" the air and create turbulence. Just something to think about.

 

[lucaq]

Re: who makes aerodynamic underbody plate for A2? (aquabat911sc)

quote:[HR][/HR]If you do something like the plexi tray you will want to combine that with exit vents in your hood. The air coming in through your grill and valence intakes needs to go somewhere and you blocking its exit with that plate.
This is a good idea, but undercar aerodynamics is a difficult thing to engineer. If you end up with too smooth an underbody you end up getting stagnent air which creates a high pressure area under the car(lifts it up) Companies that have completely flat bottom cars often end up putting in trip strips, and other various spoilers under the car to "trip" the air and create turbulence. Just something to think about.[HR][/HR]​

Hummm, yes, thanks for your input! This is exactly the kind of converstation that i wanted. Could you cut a portion of your rain tray out and make it an engine air exhaust pipe that sent that air that came in thru the grill out of the rain gutter vents (like on the opposite side of the fresh air intake). I bet that you would have to seal it off good, but i would keep the rain tray and still let engine air out?
I knew that there was alot involved in doing something like this, but it can actually be a performance upgrade if done right whereas a rear wing is nothing but bad news on a FWD car...just for asthetics.

 

[aquabat911sc]

Re: who makes aerodynamic underbody plate for A2? (lucaq)

you could do that, but idealy you want to do it behind the radiator and in front of the engine block. Your engine block isnt real aerodynamic and if you can keep the air from slamming into it your better off. Most people dont consider airflow once it enters the car, but it does have a definite effect. If you could shroud your radiator, and duct it out the hood that would be ideal(like a 911 GT2). Another thing to think about is its hard to exit air right in front of the windshield. You have a drastict change in angle of attack, which creates a high pressure area. You can also blow air out the sides of your valence. All the Honda guys have these huge front valences with air exits out the sides(in front of the front wheel wells) but I havent seen a single one with the ducting inside to actualy make them work.

 

[Batan]

Re: who makes aerodynamic underbody plate for A2? (16v)

Why do you have a pair of runners under there?

 

[B3VR6]

Re: who makes aerodynamic underbody plate for A2? (lucaq)

quote:[HR][/HR]I knew that there was alot involved in doing something like this, but it can actually be a performance upgrade if done right whereas a rear wing is nothing but bad news on a FWD car...just for asthetics.[HR][/HR]​

Now now.. we don't want to make generalizations on there now, do we?

Rear wings do have their place on FWD Race cars.. either to kill lift or to increase rear end downforce. (Just look at the Aussie and Euro Super Touring series.. they wouldn't put wings in there for no reason...)

 

[lucaq]

Re: who makes aerodynamic underbody plate for A2? (B3VR6)

quote:[HR][/HR]Now now.. we don't want to make generalizations on there now, do we?

Rear wings do have their place on FWD Race cars.. either to kill lift or to increase rear end downforce. (Just look at the Aussie and Euro Super Touring series.. they wouldn't put wings in there for no reason...)[HR][/HR]​

I know this...what you have to understand is that those cars have alot more going on as far as aerodynamics (as we are finding out); they have the power to pull that wing; they are going speeds that are high enough, consistantly enough to be able to make the advantages overpower the disadvantages of the wing; some of them are AWD or RWD.
As far as i am concerned they have no place on a FWD street car. I challenge someone out there to give me a good reason or show me evidence otherwise. They slow you down, are ineffective at most speeds (and the speeds that they are effective at are not traveled by a car enough for its possible benefits to outweigh its detriment). Most aftermarket wings are not even designed with aero in mind, but rather asthetics and most have never even seen a wind tunnel or been tested.
The only reason that a spoiler might help (i am going to throw this out there now so that someone does not throw it in my face

) is by reducing vortexes after the car finishes parting the air at the rear end. Some people say that a spoiler or wing designed to finish cutting the air cleanly can reduce drag by redusing these vortexes. I have heard this but never seen evidence of it.

 

[nicholasp]

Re: who makes aerodynamic underbody plate for A2? (lucaq)

I second acquabat's caution.
If you look at the underside of the new Ferraris, both of them have an underbody tray, but it is not perfectly flat like the plexiglass rabbit pictures here. there are two distinct channels molded into the front and rear of the car in order to help air flow underneath the air... otherwise at high speeds a flat underbody tray would create high pressure zones and lift the car, most likely at the front, which is bad from a handling perspective.
Simply, There are pictures of A2 windtunnel testing floating around the internet, and it's a cleaner car aerodynamically than it looks. Trying to out-engineer VW might not be that worthwhile a procedure. An no, it's not easy to computer model airflow like that to do it yourself, even for someone with a University's worth of computer programs and power at their fingertips (i.e. - me)
But if you want to do it just for show on a street car - probably no harm done. You might notice some different noises and feelings at extra-legal speeds on the highway, but that's about it.