Since I'm able to run my car in germany,... the land of the mighty "autobahn" my car sees mostly top end runs instead of quater mile racing.... I'm pretty impressed about the current top end but I want to built up my car even more for top end power. My goal is 185 MPH.... what kind of aerodynamic mods would be useful at that speed range ? I'd imagine a bigger spoiler would be benefical ? Also, at these speeds its important to have as little air under the car as possible... any ideas on what modifications I should consider ? I will also be doing a lot of road&track racing.

Thanks,Alex

 

our cars are more drag limited than anything else. Gear down (think 2.73 or possibly 3.23) and head/cam setup will get you there. If you're looking for huge power, keep stock gearing and 6th gear will get you there. Raced my buddy's hayabusa from a roll and got smoked until about 160 when I crept up on him and we stayed side-by-side until he shut down when his speedo was reading over 200mph, which is realistically about 180-190 mph, bike calibration is always a little off. But I was still pulling.

 

Try playing around with #'s on this gear calculator. Looks like with a 6000 rpm redline you're limited to about ~180 mph in 5th with 3.42 gears. Change to 3.23's and you can get just over ~190 mph. Now if you do some engine mods and bump up the redline to around ~6500 rpm, then you can get more speed out of each gear even with 3.42's. I didn't even bother looking at 2.73's w/M6, but that would probably be crazy!!

 

going to take a lot of power to overcome the drag coefficient. cam/blower will get you there, and lowering the car won't hurt.

 

I'd also look into suspension mods to keep the car stable at high speeds. I suggest to go to Stranoparts.com and ask Sam Stano how to setup your suspension.

 

BRAKES,GOOD BRAKES! Lower that thing and suspension mods. Saftey first!

 

get some good rotors and pads, like strong sloted rotors and hawk pads, after a few 140-0 runs my stock brakes warped pretty bad.

 

get that thing draggin the ground i say lower it 2 to 3 in depending on high high it is now and bigger wheeels can help a little but lower it and make sure you get some good racing tires dont want a blow out at 190.....BOOM hope that helps a little get back and tell em how fast ya went.

 

Thanks for the input so far, most of you suggested brake & suspension mods. I already done some mods to
these areas.

as for brakes:
- Thunder Racing Brake Package w/ PowerSlot Rotors & Hawks Pads
- Stainless steel break lines

Suspension work:
- Eibach Pro-Kit Springs
- BMR Adjustable Panhard Rod
- Bilstein Front/Rear Shocks
- Adjustable LCA Brackets
- C5 Y2K 17"+18" Wheel Combo (They let the car sit a lot better on the road)

Plus I also plan on getting SFCs.... do you think these parts are sufficiant enough ? So far I really can't complain about the handling or braking capability of the car.
What do you guys think I could do to help the aerodynamic factor ? I plan on putting a GFX kit on, mainly for appearance reasons, though I think it could also benifit aerodynamics.
Maybe also a bigger wing instead of the stock one would give me more downforce ?? Any ideas on which one would work ?
As for gears, I plan to stay with the 3.42s as for now, I rather do heads&cam than loose too much low end power.

-Alex

 

If you're intending to run the car at redline for extended periods, you may want to prioritize the oiling system for the engine as well as the cooling system.

 

With a low cD, a car could reach 180mph with 300hp if you are geared right and not have to low of an overdrive since overdrive kills your forward momentum.
For example, I've read a few posts on corvettes that can cruise at 170+ in 5th gear but as soon as they shift to 6th, they start to slow down.
To hit 200mph (which is only 20mph faster than 180) you will need to double your horsepower to overcome the drag of air resistance.

 

you're still ignoring the power aspect, stock hp isn't going to get you there no matter how much in suspension mods you invest.

Also keep in mind corvettes have under a .30(.29)drag coefficient, fbodies have the aerodymanics of a brick in comparison (.34-.35).

Don't believe me? The new Chrysler Town & Country MINIVAN has a Drag coefficient of .34, the same as our aerodynamic LOOKING fbodies.

Toyota prius has a drag coefficient of .25, one of the most aerodynamic vehicles to ever hit the road.

To hit high speeds, you have to go about it the forumla 1 way, whose drag coeff. is more than double our cars: more power to overcome the aerodynamic deficiency. You can't ignore the suspension, but it's not going to help as much as you think.

Our cars are aerodynamically limited to about ~165 (give or take a couple mph) with stock power. Lowering + larger wheels/tires to fill your gaps is the best bet.

 

My main reason about the suspension mods was for the saftey of the car/I mean driver/ b/c it is alittle scary trying to handle at that speed.

 

well, spoiler would definately be a big help
the stock one (even your ss one) do not help with aerodynamics much at all since they allow air to pass under them
get one like the 3rd gens that actually sticks to your car and that would greatly help (which is one reason why 3rd gen owners say their car feels stable at high speeds while 4th gens tend to "float")

 

I dunno, my car felt pretty stable cruising at ~160 mph. Maybe it's the GFX w/additional spoiler? (aka: 'sports appearance package'). And no, I'm not BS-ing either. Only did it once though.