Last post on Nov 07, 2006 at 11:41 AM
You are in the Subaru Impreza
What is this discussion about?
Subaru Impreza, Sedan
#8278 of 11554 Rear wing and Cd
Feb 21, 2003 (9:16 pm)
Ok, guys, I was mistaken a little bit: 0.39 is for Evo VII and 0.38 is for STi, both with rear wing. So, I do not know the difference between stock Impreza and STi. But I hope that Subaru put it not just because it looks cool, but because it works.
Considering lift force, I can give you the link to the numbers which are pretty reliable. No downforce, by the way, it is still a lift force, but it is not very high.
You do not need to read these funny characters, just check out the pictures. Top is Evo VII with wing set to minimum angle of attack (Cd==0.39), in the middle is Evo VII with wing set to maximum angle of attack (Cd=0.40), and on the bottom is STi which has non-adjustable wing (Cd=0.38). Forces in Newtons. Test speed is 144 km per hour.
Also, the data is for 2002 STi, which has slightly smaller wing, then current model.
Skyline has underbody panels, which almost fully cover front and rear parts of underbody.
This picture shows the air flow near the wing: Air flow
To moderator: I had to post the picture, because I had to change its size, the original is too big and looks bad. It was taken from russian car magazine "Auto Review".
Feb 22, 2003 (7:45 am)
Michael, thanks for posting the info -- that is really cool. It illustrates exactly how the rear wing works (at least in the case of the Evo, where we have two configurations to compare).
So the Evo wing, set at the max AOA, is worth another 146N of downforce at 144 km/h (~90 mph) compared to the min AOA setting. What's neat is that you can see how it translates into lift on the front wheels. Imagine if this was a FWD car -- you'd be unloading the fronts (=drive traction) just to keep the rears planted, which seems unproductive to me.
I'd be real curious to see numbers without any spoiler, just so we can conclude how beneficial the spoiler is, period. And since these appear to be aero loads only, it would be neat to factor in the weight of the car. I guess if we knew the curb weight and the F/R weight distribution, we could figure that out.
#8280 of 11554 vishnu vs prodrive
Feb 23, 2003 (7:32 am)
Has anybody upgraded their power with vishnu or prodrive? I was all set to get the vishnu stage subzero, but I see that Prodrive is coming out with a "power pack" stage 1, 2 and 3. The stage 2 gives you an ecu reflash, rear muffler and center cat for $1200. I have heard that prodrive may be a bit more dependable than vishnu products. Any thoughts?
#8281 of 11554 On another board ....
Feb 23, 2003 (1:00 pm)
there is a prolonged discussion of adding FI to a car. The question is about reliability .... note, this is not about stock systems.
I thought this may be a good place to ask -- do any of you feel that superchargers / turbochargers ... installed by someone who knows the car and the system ... results in significantly higher maintenance? Compromises reliability?
Thanks for all opinions.
Feb 24, 2003 (5:58 am)
Shiv P. of Vishnu has made quite a name for himself safely tuning Imprezas over the past few years.
Prodrive's experience with Subaru's goes back to when Subaru used a Legacy in the WRC.
It's too bad that Prodrive's PP won't be factory backed like it is in the UK.
#8283 of 11554 Question regarding std. 16" wheels on WRX.
Feb 24, 2003 (3:00 pm)
I am considering selling my 16"s to my coworker over the summer (when the tires are projected to be worn) to buy 17" wheels. The problem is that he has a '96 Camry V6 with 120" spacing (what he told me). Could the 16" WRX wheels be reliably installed on his car?
I was under the impression that the WRX had 100" spacing for the holes. Because of this I am assuming the two cars are incompatible, but am hoping they are compatible.
#8284 of 11554 Kevin..
Feb 24, 2003 (6:22 pm)
If one car has 100 and the other 120, you just answered your own question right there.
#8285 of 11554 No, your WRX wheels won't fit
Feb 25, 2003 (5:49 am)
on a Camry. Offset is too low and bolt pattern spacing is different as you say.
Feb 25, 2003 (7:44 am)
It's actually 100mm spacing for the WRX, 120mm for the Camry. 100" is about 8 feet!
Also, note that it's described as "5x100" because there are 5 lugs. Some wheels have only 4.
Best place to sell is NASIOC because for the most part it's only going to be the correct offset for other Subies.
#8287 of 11554 Thanks guys for the info. I will tell my co-worker the bad news
Feb 25, 2003 (9:43 am)
Actually, the offset should be able to fit a Camry. The hole size and bolt spacing is the issue, 19mm for the WRX vs. 21mm for the Camry. According to a website I looked up, the Camry v6 has an offset of +45, of course the have the WRX as +55. I found out the spacing for the Camry is actually 114.5mm, which is still too big. Oh well.
I will look in to NASIOC for selling the wheels when I am ready.
- Thanks Juice.