162 now. I need more downforce at the front. It was starting to drift left, and I needed to make corrections.

 

There have been a few threads on this already...

165 about 8 times, 145+ about 50 times at least

Even at 165 it had WAY more power to go. 400 rwhp helps.

Brian

 

167 for me with another FD behind me doing 160~.

 

171 for me and 145 about 10 to 15 times 135 on the back strait at wakins glen international in N.Y. track time is great!!

 

Does anyone know what the fd will do max?? I mean redline in 5th gear?? By the way I did 155mph, but that was with stock rims, now thanks to my after market rims, I get a serious shake after 80 and it gets really bad after 100. So I am going to get me rims balanced and I hope that helps, if not I'll sell them to some kid who owns a honda (because he'll never know about the problem because his car won't go faster than 100mph).
-Kevin

 

A stock-geared and stock-tired FD will do around 200-205 mph at 8000 in 5th if you actually had the horsepower needed to get up there.

My FD has a short 5th gear in it which limits it to 180 mph at 8000 RPM and I plan on getting that on video this summer

Brian

 

140-150mph on a secret straight public highway whenever I want & 165 once. : ) It felt solid.

 

145 mph with only a downpipe and high flow cat... Blew past a modded GTI who thought he had something on me.

 

hey guys i just got my car a lil over a month ago, and i live in syracuse, NY so the we havent had weather that i am confident in really pushing my FD. I have done 132 in my car and had so much more pull left in 4th gear. Once the weather gets better i have plans to top my car out. ill post when i do this. I have a few mods on my car cb, dp, lite weight pulleys, Ic, intake, stuff like that. I was told there is a governer on the FD, is this true and if so what does it top at, and will a power FC get rid of it?

 

4th redlines between 140-145, I've seen that NUMEROUS time stock and modded. I rarely ever keep going though cause then you go to 5th its geared to high it pretty much falls on its face.....at least when your stock. Dont get me wrong it'll keep pulling in 5th but its jut mush slower as compared to 4th. I mean after all it is just a OD gear.

Oh yea, the most mine has been up to is 155ish racing a C5. I had a intake, dp, cb. It was still going but we decided to back off

I believe most of the mags reported 160 top end on a stock FD. I think its geared to be able to touch 200, all you need is the power, rubber, and prayers

STEPHEN

 

Dude, hopefully you will be able to come back and tell us about it.

 

I did 290kph (~180mph) on the freeway, it still had plenty more to go and felt pretty stable.

 

damn u guys are nuts...come to ma and try that...our potholes on the highways are bigger than the pot holes on side streets in most cities....swallows cars whole..
ive done 160 indicated in a 01" gti on 17"s in the passenger seat tho...never really had the urge to pussh a car that high...maybe 140 the highest.. but my last car had warped rotors which wasnt the best at high speeds

 

when reading this all i can think of is that video of the 217 mph rx7 blowin over...thats some scary stuff

 

i remember that vid not a nice site.

got 172 out of my stock 7 apart from apexi n1 exhaust and ported engine.

ran out of motorway but it was still going!

 

I have seen 160+ a couple times on the old motor. The new motor did 170+ Malloy Mazda reman with downpipe and catback running 10psi. That's it.

 

That, and the link that someone posted to an Italian site that showed the bloody aftermath of high speed crash on the autostrada (Italy's version of Germany's autobahn). Yuck.

 

I hit 150+ racing a Ferrari Testarossa before I let off. This was with no other cars around -- of course. Car still felt plenty stable and was still pulling. Downpipe and cat-back. I have hit 120 more times than I can count and have topped out 4th gear (about 140) several times.

None of these pulls occured in traffic.

 

Best top end was 162-163 (whatever the first little hash is after 160) Totally stock, still pulling I would say.

Best average is between Springfield and Decatu, IL. 140mph average (35 miles in about 15 minutes or so )
Did it once with a cop going 95 or so, to give you a read on how fun that road is....

Best longer trip would be when I picked my car up from the previous owner in Orlando. Err, back to St. Louis in a hair over 12 hours including stops.

J

 

170+ on the Fl turnpike wasnt really looking at the the speedometer after 155 but was in 5th at about 7000. The stock FD at 7500 does 184.

 

And no wind resistance.

 

Approximating speed is simple...

Find the nominal height of your tire:
P275/40-17
Sidewall height = 275 * .4 = 110mm / 25.4 mm = 4.33"
17 + 2 (4.33) = 25.66"

Find the circumference of your tire:
2 * pi * (25.66 / 2) =
2 * 3.14159 * 12.8" = 80.62"
80.62" / 12 = 6.72 ft.

Find wheel speed for a given rpm and gear:
engine rpm / trans ratio / diff. ratio = axle/wheel speed
7,500 rpm / 0.71 (5th gear) / 4.10 = 2,576 rpm

Find vehicle speed:
2,576 rpm * 6.72 ft. = 17,313.6 ft./min.
17,313.6 * 60 = 1,038,818.3 ft./hr.
1,038.818.3 ft./hr. / 5,280 ft. (1 mile) = 196.7 mph

With wind resistance, tire slippage, and considering that tires are not perfectly round, the actual vehicle speed will be somewhat lower, and the margin of error will be higher as speed increases. So if you calculate your "maximum speed" in 3rd gear, for example, don't be surprised if you can't reach that speed on the road.

 

130 let up due to front tires having a little ware on the inside! It was fun and all started due to a old 1.5 stang he didn't have a chance anyways... plan to go mess with some beamers when new motor is installed and broken in still scared of some of the porche boys!

joe

 

Not to nitpick, but you're forgetting the fact that tires' diameter actually "grows" at high speeds, which changes the first and second equations.

 

Funny, looks an awful lot like nit-picking from this angle...

I'm just curious, though. Which part of "considering the tires are not perfectly round" didn't you understand? Even with tire growth, they will never be the perfect circle that the calculations use. Hence my first sentence, which reads "approximating speed"...