C5 Top Speed Run Question
Drifting
Joined: Jan 2010
Posts: 1,447
Likes: 1
From: Katy TX
Rake it a little more in the rear. The air will exit the rear faster creating downforce but don't rake it too much. I still don't see you gaining 20mph with an A4 tranny from 1.8 mile to 3 miles. I still stand by my 185mph at the most within a 3-4mile accel run.
Thread Starter
Safety Car
Joined: Apr 2007
Posts: 3,582
Likes: 136
From: SoCal CA
So you think I would only accelerate 5 more mph in another 2.2mi, because that run was 1.8mi? Im sure on pavement it would be a different story. On dirt I waste a lot of distance part throttle and too much wheel spin. Idk, she was puling pretty steady. Maybe not 200 but probably 190+ in 4mi...on dirt. Also I pull 3rd to around 153mph, it shifted on that run at 130. I think that killed a little momentum too.
Race Director
Joined: Dec 2006
Posts: 12,367
Likes: 2,900
From: Fort Worth, Texas
Taping helps as well, check out the hood bulge in this video
http://www.youtube.com/user/vegaman7...14/QhUVWKZpkYc
http://www.youtube.com/user/vegaman7...14/QhUVWKZpkYc
Thread Starter
Safety Car
Joined: Apr 2007
Posts: 3,582
Likes: 136
From: SoCal CA
Taping helps as well, check out the hood bulge in this video
http://www.youtube.com/user/vegaman7...14/QhUVWKZpkYc
http://www.youtube.com/user/vegaman7...14/QhUVWKZpkYc
Drifting
Joined: Jan 2010
Posts: 1,447
Likes: 1
From: Katy TX
Air doesn't leave the rear cowl where the seal goes. Air travels towards the rear of the engine compartment and travels underneath/exits under the car.
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
Adding spoilers, splitters, side skirts, wings and extractor hoods all increases downforce and aero drag or greater resistance.
Taping up all the cracks with speed tape, and taking off the out side mirrors decreases aero wind resistance
However, to hit that magic 200, HP is what is needed.
and to get from 180 mph to 201 mph is not just additive, that hp increase is logarithmic. 500 rwhp may get you to 180mph, but close to 900 will be needed to get to 201 mph.
That last 10 mph is biggest jump in hp increases too.
Drifting
Joined: Jan 2010
Posts: 1,447
Likes: 1
From: Katy TX
the cars rake is factory set. Lowering the front no more then 1" and keeping the 3/8" rake is essential for best aerodynamics.
Adding spoilers, splitters, side skirts, wings and extractor hoods all increases downforce and aero drag or greater resistance.
Taping up all the cracks with speed tape, and taking off the out side mirrors decreases aero wind resistance
However, to hit that magic 200, HP is what is needed.
and to get from 180 mph to 201 mph is not just additive, that hp increase is logarithmic. 500 rwhp may get you to 180mph, but close to 900 will be needed to get to 201 mph.
That last 10 mph is biggest jump in hp increases too.
Adding spoilers, splitters, side skirts, wings and extractor hoods all increases downforce and aero drag or greater resistance.
Taping up all the cracks with speed tape, and taking off the out side mirrors decreases aero wind resistance
However, to hit that magic 200, HP is what is needed.
and to get from 180 mph to 201 mph is not just additive, that hp increase is logarithmic. 500 rwhp may get you to 180mph, but close to 900 will be needed to get to 201 mph.
That last 10 mph is biggest jump in hp increases too.
500rwhp will get you to 200mph in maybe 4-6 miles with a MN6 but definitely not in 1 mile.
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