my stock front lip is damaged and want to replace it , I was thinking of replacing it with something different. will the lip from aero kit for the turbo fit the regular bumper and will there be any issues with aero dynamics ? since it say in the tek equipment that you cannot mix and match parts? i also saw some where in the forum that the oem front lip creates -ve down force at speed , is that true?

 

I would give Matt a call @ GMP.... I know Matt will take care of you!!!

 

I didn't understand your last statement (-ve down force) but the aero front lip fits the OEM front bumper just fine and I was told that it provides a little more downforce. I have the full aero kit installed and love it...mostly because of the way it looks.

 

thanks ruf turbo, i am not changing the rear section, that was my concern, as far as the -ve downforce, i meant that higher speed it actually creates lift, i read it on the forum here some where , not sure if it is true, it said to create more under steer at high speeds for safety

 

I would not mix the front aerolip without the tail.

 

Now that you mention it, I do remember being told that Porsche didn't recommend using just the *rear* wing because it provided more downforce and needed the front lip to balance that out.

The front aero lip is designed to provide *more* front end downforce and I can't see how this would change at higher speed, i.e. changing from downforce to lift as your speed increases. However, I'm not an aeronautical engineer either.

 

may be i was not clear, i only want to change to front aero lip and keep the rear spoiler standard, I know people add after market lips with standard spoilers?

 

understood but why do so many people here have upgraded the front lip to a after market lip with standard rear spoiler, thats not any different then adding the aero lip only. I know the AM lips create more down force as well. hence my questions, others can chime in as well

 

I think adding the front aero lip *IS* OK with the standard, or any, rear wing.

Just saying that the Porsche warning was don't use the aero wing without the aero lip.

 

I totally understand regardless i wont be going with the aero lip as it comes primed and not the same finish as the standard lip. all my sides are unpainted so i dont want to go thru the whole painting process

 

The wing without the lip at high speeds will become unstable. A front lip/rear spoiler combo must be aerodynamically balanced( re decreased lift and increased downforce). NASCAR actually has a formula for it that most other racing bodies utilize as well. If you're just tooling around the street, makes zero difference, if you run your car on a high speed track like pocono with any banking you'll be a little unsettled.

 

thanks tt surgeon, so even if i just used the aero lip with the standard rear spoiler i will see the same issue, only reason i am saying is that i read on the forum that the front end feels floaty at speed?

 

In theory, no one would "officially" recommend mixing and matching, but in practice, you are not going to feel any difference. Many on this forum have changed front lip only and take car to the track, to higher speed, etc., and no one has ever mentioned any instability. While both rear wing and front spoiler help to create down force, the way they work, and how much force each creates, are quite different. There is a good discussion on this that I am too lazy to find URL now, but here is how I remember it:

The rear wing acts to slow down the speed of air on top. Without the wing in a fast-back car, air on top flows faster than air below car (longer path on top secondary to the roof curve), and this causes a decrease in pressure (Bern.'s princ.) and therefore the car is lifted upward. There is no denying the importance of the rear wing in a fast-back car and this is the component I wouldn't touch. Its shape, angle of attack, surface area, are all very important parameters.

The front spoiler's primary function, OTOH, is to reduce air flow underneath the car. As such, how close it is to the ground is its most important parameter (just look at all the 911's in ALMS.) In other words, IMHO merely changing the shape of the front spoiler does not create a big mis-match, because, one, the new spoiler serves the same function, and two, in our Turbo that is so far off the ground, the effect is small to start out with.

One particular example is "eclou" with his Techart spoiler without Techart rear wing: 186 mph at Texas miles, and I am certain lots of track time at very high speed. Bottom line: if there is any effect of front spoiler, IMO it is negligible due to the height of our car. Change it and make your car pretty.

 

ronnie i think cannga sums this one up. It really wont matter that much if you put an aero lip on or a techart or whatever takes your fancy. Either are better than the stock one. The stock lip looks a little ordinary imo. You can do better for your car .

 

If you get going fast enough, yes. Remember the techart is apples and oranges vs the oem aerokit ,it's an aftermarket part designed to be used with or without the rear wing. Personally, I find it a little out of place on a turbo, but I don't care for aftermarket body kits in general, unless it's on a supra or something.
If you never go to the track, you have nothing to worry about. Plus, if you're busting stock lips now, the aero lip will get chewed up as well and it's a lot costlier to replace.