Camera out the back , neat view

[litteng]

you have some form of additional wing on the back, i wonder if that rear spoiler poping up and down is really a benefit?

any reason for not deactivating the spoiler?

[harryrcb]

Originally Posted by litteng

you have some form of additional wing on the back, i wonder if that rear spoiler poping up and down is really a benefit?

any reason for not deactivating the spoiler?

Yes, I have considered that, but things are going well enough and why mess with it as long as its working. I don't think the wing by itself will give me enough downforce in the higher speed corners without the stock spoiler, maybe if I put a bigger wing on it then I can disengage the stock. Anyone else have an opinion on that?

[Dave928]

i would think that the stock spoiler is actually working better with the wing.

instead of letting air spill around it when up, you're channeling the air at the wing and when it's up the air has nowhere to go. a pocket capturing the air, if you will.

Originally Posted by harryrcb

Yes, I have considered that, but things are going well enough and why mess with it as long as its working. I don't think the wing by itself will give me enough downforce in the higher speed corners without the stock spoiler, maybe if I put a bigger wing on it then I can disengage the stock. Anyone else have an opinion on that?

[harryrcb]

Originally Posted by Dave928

i would think that the stock spoiler is actually working better with the wing.

instead of letting air spill around it when up, you're channeling the air at the wing and when it's up the air has nowhere to go. a pocket capturing the air, if you will.

If that is the case wouldn't that take away from my top end down the straight? Perhaps that is why I haven't reached a higher speed, I have been wandering about that as well

[Dave928]

no, there'd be a bubble there , you're going thru the air cleaner. and it's adding to your downforce.

the same as a pickup truck at speed. with the tailgate, the air flows over the cab and past the tailgate. drop the tailgate and you lose the bubble, increasing drag.

[harryrcb]

you are right about the pickup truck, have seen documentation supporting that, so you could be right about my car as well. hmmm something to ponder, thanks for you input

[insite]

the pickup truck increases drag when the gate is open only because the back of the cab is squared off & results in turbulent airflow. the box w/ the top up has a nice slope that guides the air around the car; a result similar to the pickup truck is unlikely.

further, we need to understand the difference between a spoiler and a wing. a spoiler reduces lift by slowing the speed of the airflow over the car. when the air is significantly faster over the car than under it, the bernoulli principle tells us that pressure will be comparatively higher under the car than above it. the result is lift. a spoilier interrupts that airflow & increases the relative pressure over the car, in turn reducing lift.

a wing, instead, develops its own counter-force by generating the reverse scenario of the car itself: it's designed to accelerate aiflow UNDER the wing to press the car down at speed. so there we have it: a spoiler reduces lift while a wing generates downforce.

all this having been said, fluid dynamics is a funny thing.....the air rarely does what we think it will. my guess is that your setup increases turbulence & drag, but does not appreciably affect lift / downforce at the back of the car. your best bet is either the factory setup OR a larger wing, but not both.

blue2000 is a whiz at this stuff; maybe he'll weigh in here.....