racer_dave

I think I'd look at it differently. If you are serious about the 160mph, then you need to quit worrying about what it will look like and begin to worry how it will function and mount to hold the forces on it. The big chin will scoop the air off the ground but then its going to direct it up under the bumper which at speed will show lift.

I think to make it functional you need to get the front valence/pan more vertical so you don't have the under cut below the bumper. Then a small lip on the lower edge will settle the car at high speed. This will of course change the whole look of the front of the car, but when you are doing 160 and you have to steer it you'll be able to.

Tims65

You're not going to see 160 mph in a '65-'66 Mustang, the aerodynamics just arn't there. These cars consistantly top out around 140.

That being said, I use a bolt on front chin spoiler at the track and see a noticable difference up to 125 mph. I bolt it on for track days, but remove it for street driving (it's a curb catcher).

andrewmp6

160mph can happen just need about 700hp up to push the brick the mustang is to reach it.On a f1 car the belly pan on them is a wing too and does a lot of downforce.Mickey Thompson use to race mustangs on the salt flats some of his numbers still stand today.The car he used most was a 69 mach1 with no body mods not even a spoiler on it.

67mustang302

I've seen classic Mustangs turn over 200mph at the drag strip. With enough power anything can be made fast, but road racing is a whole other environment. The thing people forget, is on a road course, you have neither the space nor the time to get the car to it's maximum speed, you'll always have to slow down for the next turn before you hit whatever ANY car's top speed is. That's why every racing car on the planet that has to make turns ALWAYS takes measures that sacrifice top speed in favor of turning better or accelerating better, they know they'll never see their top speed. More wing, more gear...those make the difference on road courses.

And hitting 160 in a classic Mustang isn't that hard. Mine at 140+mph is still pulling hard in 4th right up to the limiter, so I'm gear limited. Never tried in 5th, but my 5th is an economy gear. And that's with less than 400hp. I know with a 3.00 or 3.25 gear(3.55 right now) it would see at least 150mph. The aero isn't THAT bad on a pony car, just not as good as a more modern aerodynamic sports car. But in the end, it's pointless, since there are very few tracks in America where you can get ANY car up to 160mph. Most people don't realize just how fast you DON'T go on a road course, mph wise. Keep in mind that a 800hp 1,300lb Formula 1 car only averages like 120-130mph average lap speed on most the tracks they run on, with some only seeing 160-170mph top speeds.

kalli

i really can't see a pre-67 model going 150mph without loosing the steering completely, but fully agreed, on the courses i've ever driven (never with a mustang) I was limited by the next corner, not top speed

67mustang302

With the right suspension and good steering, they can be controlled. Mine at 140 is still very controllable, and that's with a worn 40 year old steering box with the 19:1 ratio. You'd be hard pressed though in any performance car to find a road course where the car ever gets up to 150 though. I've seen on board videos from out at Willow Springs where I live, known as "The Fastest Track in the West" because it's a very fast road course....a modern Prosche 911 GT3 Cup(full on n/a 911 race car) barely gets a bit over 140mph in the front stretch...and that's in a 450hp lightweight and more aerodynamic race car.

Regardless, worrying about mph is often totally pointless....in the end the idea is to get around the track as quickly as you can, so you do what benefits that. Suspension and tires and driving lessons will yield MUCH faster lap times than simply trying to build a car that can go fast. Who cares if the top speed is lower, as long as you carry more speed through the corners.

andrewmp6

It depends more what track what your top speed will be a long road track you could break 150 easy in the straight parts.But you really want it geared to pull out of the corner faster and kill some of the top end speed to it.

67mustang302

You won't break 150 easy. Many full on road racing cars that are lighter, more powerful and more aerodynamic struggle to break 150mph, even on the fast tracks. There are only a few tracks in the nation that actually have enough straight road to get over 150mph in a full bodied production based road racing car. While a Classic Mustang could be built to do it, the problem is that it's very expensive to build a car that fast, and there are very few places you can do it. That then gets back to spending money where it makes the most difference....is it worth it to spend all that extra money just to be able to go 5-10mph faster on that 1 track in your part of the country that you almost never race on.

And like andrewmp6 pointed out, the goal isn't necessarily to see the highest mph...it's to get around the track as quickly as you can. Even with a reduced top speed, getting there faster will yield quicker lap times.

cmanf

Wow lots of good points about this.
Tim65 I like what you have done with yours and if you could where did you get the spoiler from?
Also do thanks for real world input on this. As I had said the 69 (not 67 I was mistaken Camaro) big red runs 200 in the silver state classic and that was what i was basing as a goal. Thought if that body could hit it so could the mustang.

67mustang302

If you have the money and the space you could get a Classic Mustang over 200mph. Hell, I've seen a full bodied Olds at the strip lay down 235+mph in the 1/4...but it's also a AA gas car....and VERY expensive.