200MPH Club
 

I want to hear how many members have tapped into in this range in their "Rotary Powered" Land Vehicle

anyone?

it quits becoming a land vehicle when you hit about 200. to prove my point here is a video as an example:

http://www.youtube.com/watch?v=8z0dPxphvVw

cheers

200mph is fast. i have done 176mph and that was pretty crazy. a solid 500+whp rx-7 will get you there soon enough.

^
No
http://www.racingbeat.com/ConMR9395.htm

Wow. I have known about their feats on the salt at Bonneville for a long time. But I didn't know that Racing Beat hit 200+ on the 1.3 mi. at El Mirage. That is impressive.

it was a joke

with enough downforce you can go well past 200. thats wat spoilers are for...

i will join soon enough. hit 175 already... just need a new tune, more fuel and some aero work.

you guys are nuts.......

my knees start shaken at 80

all i need is a tune and a good long straight.

bryant you bastard you made me pause.

hahahahahahahaha.

I don't believe the FD tranny and 4.10 rear end are geared for 200 mph, more like 195 at 8000 rpm in 5th gear. I'm going off of something I read way back when on the big list.....

Never done it in my 7, but I have in my other car. Hit 214 mph in the quarter mile =) At least that's what my timeslip says

you are right, but it always depends on how much horse power you have.:icon_tup:

Adding spoilers creates downforce and drag. Adding drag requires A LOT more power at those types of speeds. Minimal downforce allows the car to go faster but how much is to little.

I wouldn't call that car a joke, many cars have flipped trying for that type of record.

How much difference does wheel size make on top speed. How fast would you be goin at 8000 rpm with 18 inch wheels?
I want my car to hit 200 some day, but with someone else test driving it for me

hahahhaha ... 200mph is very fast but one day ill get there.

Id start worrying about all the suspension components and such. Shit can come loose.

Loctite is cool.

Breaking 200mph is HONESTLY one of my goals for the current FC I'm building., and I plan on running it in the Silver State Challenge. I haven't made much progress on it lately due to work, school etc. But when it gets closer to resembling a car I will post some pics up. Its just a seam-welded, foam-filled shell awaiting a cage at the moment.

turbojeff, this is wat i meant was a joke...not the video

you would prob need a windtunnel chamber to find out how much drag/downforce is to much for reaching certain speeds. but formula cars have this done and they still go flipping through the air. the testing must not take into consideration changes in wind duration or direction. :dunno:

Just noticed this, so pointing it out

sorry guys i had to take it off.

^^ hahaha

Actually it doesn't.

Yes, you'd need the HP it takes to reach 8,000 rpm in 5th gear (and overcome the aero drag), but once you get there, if 8,000 rpm is your rev limit, then another 1,000 hp won't help you. The car will only go X mph, at X rpm, in X gear.

Not really the wheel size but overall diameter of the tire and wheels..

you could also raise the RPM limit to higher than 8k.. there are several people that retune their PFC to rev 10k.

I think its doable.. but I wouldn't want to do it in my car.

Wasn't there someone while back that posted saying they hit 200MPH on some street in FL?? LOL!

trust me. with easily 4-450 you can hit 200 (maybe more) the gearing is good for 200mph. I didnt want to start the flame war but i hit 206mph long time ago. After the new tunning i supposed to get it on video so it will show. Crazy dane hit 180 easily in a tunnel. i found out when i was at 5 1/2 k @ 185 so the gearing isnt it. and these cars have great aerodynamics

Bullshit!! No way you were going 185 mph @5500 rpm on stock gears.

thank you...

I thought stock gearing (transmission and diff) hit 8000 rpm @aroung 165 MPH??? am i missing something or am i just misinformed?

http://www.kabamus.com/garage/gears.html

Throw the numbers in yourself and see how fast you're going at x rpm in x gear with x transmission ratio and x final drive ratio.

well here is where it starts...

first of all, you cant get past 180 cause the speed limiter wont let you go above 178.

i used a top speed calculator to find out top speeds in each gear with the stock gear ratios and this is the result-

1st: 37mph
2nd: 64mph
3rd: 94mph
4th: 130mph
5th: 182mph

so adamc is 100 percent correct

try it yourself----(the ones already pluged in are for a 240sx, just fill in your ratios and wat not to figure out your top speed or the stocks top speed):
http://www.catherineandken.co.uk/sti/tyres.html

I think that racing beat car flipped over because it didn't have aerodynamics for that speed. The car's aerodynamics looks like a stock R1, now I don't think an R1's aerodynamics were designed to keep the car stable at 215 mph. Maybe the car had underbody aerodynamics?

a stock fd is only able to get up near 180mph. a higher rpm is needed to break the 200mph bracket, on the dyno my car hit 165mph @ 7648rpm


and @ darkphantom i call


:bsflag:

I was riding in a buddys fd when we hit 180mph before he shut it down. I dont know what rpm we were at because I was too busy shitting my pants. It feels a whole lot faster when you are in the passenger seat and not controlling the car. I do remember him saying we had more room to go, but we were in a 60-1 hifi fd that was running about 15-16lbs. I dont know if the car had much more in it powerwise to go much faster. It took a long time to go from 140-180.

on a stock FD, at 8k RPMS on stock gear you should be hitting almost 200mph. The 5th gear ratio is .72, correct?

well I mean I practically went 170mph (167) on twins at only about 11 to 12psi, 180-200 seems totally reasonable with a single around 15psi.

From my video I got this info.

140mph @ 5100rpm
165-170mph (almost looks on the money at 170mph but not sure) @ 6400rpm

My redline is set at 8100rpm

.719, it's 200.69 mph to be exact.

this is a good thread. :)

I don't think people are understanding the issue here.... It is NOT a HP problem it is a gearing/rpm limiting problem.

On a side note I've been 191mph in a 430rwhp t66 powered FD with stock fifth
and final drive gear. The FD was running a 275/40 17 which is about the same as stock hight. RPM reached was 8,2XX and mph was read off of the pfc. Oh yeah and the only reason I shut in down was because you find out you reach traffic VERY fast @ 191mph... The car was definitely still pulling though :)

-J

your speedo/tach can also be slightly off i guess, but you're right it is a gearing problem. Which is why I provided a calculator for everyone to use.

I have hit 175mph NO PROBLEM before. I could have kept on going.... there was plenty of road left BUT the cop that I blew by at a CLOCKED 152mph made me stop..... lol

It is definitely possible with the right gearing. My new Ford 8.8" rearend will have 4.33 gears so I won't be able to reach 200mph. If the cop wouldn't have been there I would have kept on truckin'.

Wow, That is pretty quick, The most I have taken mine up to is 160. I would love to break 200mph one day. Silver state is definitely in my sights.
But so is a rotary powered RV6 or 8 that cruises at 200mph+ and still gets 20mpg+

Silver State Classic Challenge SEPTEMBER 18-21, 2008
Who is interested in doing this event? Only $200.00 for 90 miles As fast as you can run! Anyone care to caravan from Alabama?

.

I went last year and volunteered as a course worker. It's definately a fun event to be involved in.

This is just asking for a blown motor.....heat builds fast @ those speeds.
-J

Your right! I'll bring an exta one with me just in case.

A few reasons you should question the accuracy of any high-speed claims:
1) the speedo has error, which is proportional to speed. If you're driving 60 and it reads 62, not a big deal. If you manage to make it read 186, it's really 180. That's just speedo error.

2) Your wheels will change in diameter as they increase in speed, in addition to any difference in wheel diameter if they aren't exactly stock size.

3) Wind is an absolute effect. 5mph tailwind is 5mph additional top speed. Stock gearing is ratioed such that you'd break the rear axles topping out the top of 5th. Top of 4th is actually asking quite a lot, so you're limited by drag. So any serious speed claim needs to be an average of two equal drives done in both directions.

Dave

I want to join the 200mph club on the tehas mile.

I don't think i'd even trust the stock trans or rear end at 200mph. I don't understand why some of you are hell bent on trying that.

really no point, just bragging rights

Food for thought:

The stock FD puts about 255hp to the flywheel. It's also rated to for a drag-limited top speed of 155mph.

The drag force goes up with the cube of power. Assuming for a moment the same gear ratio will take you to 200mph also:

(155mph)³/(200mph)³ = 255hp/X. X must equal 547hp. So going only 29% faster requires over twice the power. And it's not that clean, since you won't get there in the same gear - you've got to change gears and lose leverage and efficiency, meaning the engine needs even more power.

Some notes on the Bonneville experiment: high speed runs at Bonneville differ from wind tunnel preparations and asphalt driving. The entrained sand/salt that follows along in the wash of the car actually slows it down substantially. Essentially, the sand makes the air heavier and with more drag. There are many unknowns, and Racing Beat was not the first nor last group to run at Bonneville and add such a painful data point to their knowledge.

Another point: the stock FD has a positive coefficient of lift, which you'd want to resolve before heading to do a really high speed run. Adjust the aerodynamics to produce a downward lift coefficient and you will incur more drag. The extra drag will really add to the amount of torque required to drive a car *stably* at such high speeds. Ride height is also a major factor - you'd need really stiff springs and very low ground clearance to improve aerodynamics. Which is why most street cars with 500hp are not safe to drive at top speed - the aerodynamics simply aren't built for doing it safely.

Anyway, enough armchair BS. It takes a lot of car, more than just engine.

Dave