SVX Network Forums Live Chat! SVX or Subaru Links Old Lockers Photo Post How-To Documents Message Archive SVX Shop Search |
IRC users: |
#16
|
|||
|
|||
Re: Functional Aero Kit
Quote:
as far as the rear spoiler, 8" isn't too high, just recall you can USE the rear spoiler to create clean airflow to itself. This is what the "boyracer" wing on the STi does. It does a good job of sticking the airflow to the rear window where it doesn't on the normal cars. The SVX is.. different than the STi though and I'd hesitate to assume that what works on them will work on the SVX. I present to you this as another example of how I am thinking to approch balancing your front downforce. Here is some flat sheetmetal with no foil, slope, or whatever. Yet it both produces downforce and reduces drag. More downforce by having a well defined low pressure zone below it and lower drag by smoothing the flow off the car. Now do this with a proper airfoil working with the flow off the top of the trunk lid to increase the downforce to desired levels. Not going to be legal for any road racing class I know of, but I'm thinking that large wings outside the lines of the body have been banned for a reason. |
#17
|
|||
|
|||
Re: Functional Aero Kit
Here you go, front diffuser.
http://www.compositesworld.com/artic...peed-stability btw, don't take my comments personaly. Most SVX owners are not modifing to a rulebook so I view it as a place for much more agressive and "theoretical" areodynamics than if you were setting up a STi for a specific race class. Yet money is allways a limiting factor in how far you go. Just that the SVX needs so much replaced to do a proper areo package one might as well dial it up to 11, where as the STi needs much less to see gains. Also I'm quite upset about the rash of tuners out there who are making all the same mistakes and misteps that racing cars did in the 60's and early 70's on the way to a solid foundation of knowledge. Google is free and no one is guarding thier top secret areo info from 1978. One not be able to do the insanely complex areo package of a modern F1 car in a small shop enviroment, but we have 40+ years of open wheel, prototype, sedan, hillclimb, rally, etc to pick and choose our well developed areo package from. Even a mostly street car like the Viper shows some really advanced tricks to getting the most downforce for little extra drag. Course that said I find the trend to generic aftermarket rear wings that are shaped like the vipers very very funny. The viper wing has huge hours being shaped exactly correct to match the airflow off the rear window and bodywork. Which is why the leading edge is higher for the window area and then gets lower at the ends where the bodywork is flat. So a generic curve on a wing won't match whatever car you are using it on thus defeating part if not all of the point of the 3d wing shape. Last edited by XT6Wagon; 10-23-2011 at 08:26 PM. |
#18
|
|||
|
|||
Re: Functional Aero Kit
My idea of where I want my SVX, it's a modification of the Kstaff Front bumper with adjustable splitter widebody and scoop
|
#19
|
|||
|
|||
Re: Functional Aero Kit
XT6Wagon: No worries, I never take tech questions or suggestions personal. Hell, if there is anything to be learned or added to what Im going for, then by all means, voice your opinion and lay that knowledge on me!
There is ALLOT of aero improvements that I would love to do to this car, however I only have such a budget to create what I can. I would love to have the freedom to make an all out perfect kit for this car. At this stage, and with out a proper wind tunnel, an integrated front diffuser is not in the cards. A rear diffuser will be created however to kick the air up from the back of the car. Wheel arches will not be vented in the front, however rear arch venting may be possible. There will be ducting for brake cooling and NACA ducting for engine bay cooling. By the by, that was a great article about the viper I love stuff like that! If your ever out and about, pick up a few issues of Race Car Engineering. If you like the viper article, you'll love this mag. Johnybeas: Im liking that front bumper I also thought about creating a wider stance with a wide body kit. But to do it right, it would involve moving the suspension outward to match the additional width. the VAST majority of people make their cars wider by using more offset on the rims and wider tires. What they dont realize is that they are creating a cornering nightmare. There is something called Scrub Radius when you turn your tires. The further out the edge of the front tires are from the pivot on the steering knuckle, the more it has to rotate to complete the turn. Meaning that your tires have to speed up and rotate quicker than your car is moving in order to complete the movement of the turn. You want that pivot as close to the middle of the wheel as you can to minimize this affect so your not sacrificing traction and speed to corner. Best way to figure this: Draw a straight line from the top center of the strut, past the mounting bolts on the knuckle and continue this to the ground. That line, at the ground should be in the middle of your wheel. Wow.. That made perfect sense in my head but in text its a hard read.. |
#20
|
|||
|
|||
Re: Functional Aero Kit
well, you can get some free wheel well venting by... making the front bumper/fender slightly wider across the front 1/2 than it is in the back 1/2 of the opening. This is how Nascar pulls out the air since they are not allowed to run vents. The larger front creates negative pressure across the wheel and pulls out the air preventing lift. I wouldn't have thought of this, and apparently its rarely talked about. It was some offhand comment on some site that was the first I'd heard of it. Its subtle but you can see it on the Nascar cup cars once you are looking for it.
|
#21
|
|||
|
|||
Re: Functional Aero Kit
Quote:
True. But that deals mostly with additional drag. Our cars dont have much of a problem with drag. Its just downforce im searching for. |
#22
|
|||
|
|||
Re: Functional Aero Kit
Quote:
|
#23
|
|||
|
|||
Re: Functional Aero Kit
Quote:
Its why if they allow it, all race cars run the top of the fenders vented. The old "car of tomorrow" shows the wider front clearly, while I can't really see it in the latest photos. Just a thought as its cheap to tweak the fender and bumpercover, likely no real custom work past careful pulling and maybe a couple new innerbraces to the chassis to hold the new profile. |
#24
|
|||
|
|||
Re: Functional Aero Kit
Quote:
You want the wheel to pivot in the center of the tires contact patch when you turn. Extremes off offset/backspacing on the wheels will either make you pivot on the outside of the contact patch, or the inside. Neither is good when your looking for that last bit of grip. camber plates just shift the contact patch left or right. However having to get extremes on the camber to do this is only a bandaid on other chassis flaws. On tarmac events in rally, we tend to run zero camber front and rear to get the most grip we can. But then again, weeks are spent on suspension tuning and you can only truly get away with this in AWD classes of cars. FWD or RWD need additional camber to aid with chassis stability and steering. In AWD, we just gun it and the car tends to bring itself around |
#25
|
|||
|
|||
Re: Functional Aero Kit
I hate to say it, but there will not be enough of a benefit in drag redution to make it worth making the SVX ugly with oddball fenders
|
#26
|
|||
|
|||
Re: Functional Aero Kit
bump, any progress?
|
#27
|
|||
|
|||
Re: Functional Aero Kit
Nada as of yet. Im still waiting for the funding to become available. The deal I was working for nearly 35k fell apart at the table. So here I sit for a little bit. Im still on track with the rest of the mods for racing. But the aero kit may be a few months down the line. It will happen. Just not a quickly as I had hoped.
|
|
|