payne

Guys,

Assume that I am laying down 400rwhp @6000rpm, I have a 6 speed tranny with .50 overdrive, and a auto rear with 3.90s. Also that I have a 5 point roll bar in the car. Ill wear a full nomex suit, and a helmet.

Im thinking about taking her out to El Mirage (public dry lake out by LACR) and seeing what I can lay down, hoping for around 200.

What Aero stuff should I do? This is a completely stock 93 touring. Ill tape the hood shut, tape the sunroof, and the hatch. Ill probably remove the wipers, rear wiper, and perhaps the mirrors.

Im running stock rims with brand new z-rated 245s on the car on a stock suspension. Will the suspension hold up to speeds like that?

So what kind of stuff should I consider to be stable at 150+? Should I do a bolt on wing? What about a front air dam? Should I try and lower it as much as possible? Will the stock springs and shocks be good, or should I wait till I can afford coilovers?

What does the car behave like above 140? Does it get floaty like most cars? Any nasty vibrations or anything?

Thanks!

-Jason

generalchaos

well im not sure on this, id have to guess a better suspension, and lowering it can be good, but it can be bad also, so im not sure what to do in that area. Not sure if id make it to light either, dont wanna pull a 215mpg crash like a guy did in a video I have (started to fly). make sure you got a 5 point harness with your head strapped to a racing seat as well, dont need to snap your neck if you crashed.

A wing might be a good idea, youd probly get some mean downforce from a effective wing, and that would hopefully keep you stable.

once again im not by any means qualified to advise in this area.

7-sins

I am not an expert at top speed runs but a good set of coilovers will help you. My car felt shakey and light at upwards of 120, now with my Tien Flexs I can do 150+ and it feels as smooth as normal highway speeds. You will be surprised at the difference in stability. I am sure having the car lower also helps less air go underneath the car. Maybe you could look into a R1 or 99 spec lip, from what I read those do make a small difference at high speeds.

EpitrochoidMan

IMHO this is a bad idea. Have you seen the video of the racing beat car that trys to fly? 5-point roll-bar is good, but for that kind of speed you should have a full cage. And you should have better tires than z-rated. It would also be a good idea (if you are actually going to try this) to do it somewhere safety and rescue staff will be on hand, like bonneville speed week.

Wargasm

My car with the stock R1 body and suspension had NO stability issues at 165+ mph. I didn't run out of power, just out of road, and had to slow down.

I have heard that base or touring cars are floaty at 150+. I actually let go of the wheel in my car at 150 and it was rock solid....

That was on asphalt... I am not sure what your concerns are on a lake bed. I'd imagine the surface is more slippery so you would have to be cautious about wheelspin. That's really what started the Racing Beat crash at 215 mph.

Make sure your hood is securly latched down. There is a lot of force trying to open it at those speeds.

XSTransAm

if you havent gone north of 140 why do you want to go 200? take small steps at a time and work your way to 200, im sure its possible as i have hit 170 personally.

Gibenstein

iTrader: (2)

I think you are definitly gonna need a adjustable wing such as racing beat or 99 spec if you want to keep the stockish look and a 99 lip or a r1 lip ...Believe it or not they work GREAT. Also good suspension and a lowering will help with keeping you on the floor and getting the traction instead of floating away.

mark1rx7

what is the top speed of a stock fd?

turbojeff

iTrader: (30)

When you guys say suspension you are really just referring to bolt-ons. Shocks, springs and sway bars. I don't think you need anything really fancy, adjustable shocks with adjustable spring perches to lower the car.

You should get the car as close to the ground as possible, big rear wing and counterbalance it with some type of splitter on the bottom.

Watch the Racing Beat vid of the car flipping at ~220mph.

I'm not sure if 400rwhp will allow you to hit 200 mph but it is worth a try.

wrankin

According to the original Car&Driver articles in 1992, around 162 or so.

-b

obviousboy

i think to make a run of that speed...buying off the shelf Z rated tires wont cut it....the guys that do that kind of stuff normally get thier tires Xrayed to make sure is no f*ckups in them that would come out at 195mph...

zmarko

My thoughts exactly.

LAracer

Why on earth you would ask for this kind of advice on this forum I have no idea.

Unless someone starts their reply with "I'm an aerodynamicist and...", I wouldn't take any advice too seriously.

Good luck...and make a video.

pianoprodigy

I've done 175 on a long straight bridge on a Sunday morning when it was deserted. The wipers were flapping around big time, but the car definitely could have gone faster. I think you are out of your mind for wanting to try to hit 200 mph. I would say that you should maybe go to this place and try 160-170 and see how she feels. Then make the decision. I think it is unwise to shoot for 200 mph right out of the hole because your adrenaline may tell you to keep going even though your brain tells you to slow down.

That's my advice...

Alan

DaveW

Be careful with your tire selection. Z-Rated means "above 149 mph." It does not mean an unlimited speed rating. What you need to check is the "service rating" molded on the tire which will give the actual safe speed for those tires. If you can't find the service rating, you need to contact the manufacturer for an accurate safe speed that they can be used.

tmiked

Over 150 work you way up in 5 - 10 MPH increments depending how it feels.

Make sure your front is lower than the back of the car. (Guess I shouldnt have relocated that battery )

EpitrochoidMan

Y-rated is what you should be running, 186mph+

rotary

make sure you have a niuce road to do 200 on. you dont want to hit a pot hole at that speed. a good alignment and good tires(not meaning just good condition) you need tire that can handel that kind of speed without wrippling or having the radial rip through the tire. imagine a front blow out. i also agree with xstransam baby steps is the way to go that kind of speed is really dangerous.

P.S. you might also want a racing harness & helmet.

Quadulus

I personally have the same goal for my RX... All you need is a good insurance policy (life) and maybe a clean pair of shorts.

I remember reading on this forum that it will take you around 400 hp to hit 200 with gearing a little different than stock. I think jimlab was writing it. And the spoiler idea isn't such a great one. At 200+ mph the resistance from the spoiler will require another 34 horsepower. It also will force the backend down while pulling the front up. I'll search for that article again. I know its on here somewhere.

skunks

buy lots and lots of life insurance! your family could use the money...

realisticly i dont think you should attempt it, it takes a lot of money for the safty measures your going to have to go thru as well as the modifications to your car which will probally make it unstreetable. even the professionals have trouble making their cars go over 180 some what relibly and when things go wrong, they go horribly wrong at those speeds! bottem line is if you have to ask, you dont have what it takes right now.

payne

Thanks for all the input guys.

I was just curious, although I will probably take it out to the Muroc Dry Lake Races next year and shoot for 150+

I mean hell, Im hoping to trap around 125 on the hose, so 150 is not too fast, right

Im 21, so I dont have a family yet, and if I did, I would not probably try.

I guess Ill stick to the airplane to do 200mph, huh?

So if 200 is not safe, is 165?

sillbeer

You should read through this whole post. There's some good info in it.

http://www.supraforums.com/forum/sho...5&pagenumber=1

You have to get a log on ID to browse there froum. I'm sure a Supra acts differently than an FD at high speeds but you can still pick out some good information from it. The thread is 23 pages long. They talk alot about tires, aerodynamics, braking, HP required to achieve 200mph, safty equipment, etc.....

-Destin

sub9lulu

iTrader: (7)

https://www.rx7club.com/rx-7-audio-visual-lounge-143/video-my-rx7-doing-300-kph-188-mph-305211/

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/highest-speed-stock-aerodynamics-259553/

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/180-mph-fd-109290/

Rx-7Addict

iTrader: (2)

Id reccomend some functional aero stuff...

The Feed rear wing is 100% functional, with its adjustable flap for downforce. You want that rear planted when you are going that fast, so a big wing on the back that is functional (ie. not autozone ricer crap) would be beneficial, why do you think race cars have huge ones?

I feel safer in my FD hitting 150 than most other cars at 100.. its very stable..

(note.. that last part was entirely fictional )

rx7jones

things you will need

a death wish
money for tickets while trying to reach it
friends to bail you out of jail for going 20 over the limit
life insurance
a safety mechanism that inflates a bubble arund your car incase you crash
a parachute
did i say death wish