What's the fastest you've had your FD??
06-19-02, 12:52 AM
#77
Will Work for Ferrari
Join Date: Oct 2001
Location: West Coast
Posts: 582
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by jimlab
Not unless you've got about 500 horsepower, you don't.
With P275/40-17s in the back, 500 horsepower will take an externally unaltered base/PEP model (0.29 coefficient of drag) to 201.10 mph. A Touring or R-model (0.31 cd) would top out at 198.97 mph. A 360 RWHP RX-7 (0.29 cd) tops out at about 193.5 mph with the same P275/40-17s.
Your gear limited top speed may be higher than 200 mph, but drag limited (wind resistance and other factors) top speed is always lower.
Not unless you've got about 500 horsepower, you don't.
With P275/40-17s in the back, 500 horsepower will take an externally unaltered base/PEP model (0.29 coefficient of drag) to 201.10 mph. A Touring or R-model (0.31 cd) would top out at 198.97 mph. A 360 RWHP RX-7 (0.29 cd) tops out at about 193.5 mph with the same P275/40-17s.
Your gear limited top speed may be higher than 200 mph, but drag limited (wind resistance and other factors) top speed is always lower.
Last edited by mightyslash; 06-19-02 at 01:05 AM.
06-19-02, 01:06 AM
#78
Super Snuggles
Originally posted by mightyslash
Dont base and touring have the same coefficient of drag? Because they're the same externally.
Dont base and touring have the same coefficient of drag? Because they're the same externally.
06-19-02, 03:55 AM
#82
Rotary Enthusiast
Join Date: May 2002
Location: San Diego
Posts: 971
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by grampa
I've been up to around:
125 knots (UK)
mach 0.190649
2.162189e-7 of the speed of light.
6482 cm/s
I've been up to around:
125 knots (UK)
mach 0.190649
2.162189e-7 of the speed of light.
6482 cm/s
hahahah, those numbers actually look coorect, genius!
06-19-02, 05:44 AM
#83
Full Member
Join Date: Mar 2001
Location: Sunrise, FL
Posts: 92
Likes: 0
Received 0 Likes
on
0 Posts
Jim, I have been wondering about the relationship of RWHP to top speed, I will assume that those#.s came from Cartest 2K?? How about a chart say every 20 Hp from somewhere around 240-400+?? Would that be an imposition? And How is your project coming along? I can't speak for everyone else, but I know I am dying to see that monster on the road.
J
J
06-19-02, 07:23 AM
#85
Full Member
Join Date: Jul 2001
Location: MA
Posts: 242
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by Chronos
hahahah, those numbers actually look coorect, genius!
hahahah, those numbers actually look coorect, genius!
125.921053 knots (UK)
6482.08 cm/s
Nothing more annoying than a bored engineer, eh?
06-19-02, 02:22 PM
#86
Super Snuggles
Originally posted by yellowbird
Jim, I have been wondering about the relationship of RWHP to top speed, I will assume that those#.s came from Cartest 2K?? How about a chart say every 20 Hp from somewhere around 240-400+?? Would that be an imposition?
Jim, I have been wondering about the relationship of RWHP to top speed, I will assume that those#.s came from Cartest 2K?? How about a chart say every 20 Hp from somewhere around 240-400+?? Would that be an imposition?
Let's start with a stock ~220 RWHP car with stock tires.*
220 RWHP - 0-60: 5.27 1/4: 13.97 @ 100.86 Top: 169.56 mph
Upgrade to P275/40-17s in the back (arguably the most popular size) and you get the following:*
220 RWHP - 0-60: 5.43 1/4: 14.00 @ 100.38 Top: 162.43 mph
240 RWHP - 0-60: 5.09 1/4: 13.67 @ 103.01 Top: 175.86 mph
260 RWHP - 0-60: 4.78 1/4: 13.35 @ 105.84 Top: 179.91 mph
280 RWHP - 0-60: 4.50 1/4: 13.05 @ 108.64 Top: 183.41 mph
300 RWHP - 0-60: 4.32 1/4: 12.82 @ 111.24 Top: 186.52 mph
320 RWHP - 0-60: 4.20 1/4: 12.63 @ 113.61 Top: 189.33 mph
340 RWHP - 0-60: 4.08 1/4: 12.44 @ 116.01 Top: 191.83 mph
360 RWHP - 0-60: 4.01 1/4: 12.28 @ 118.21 Top: 194.12 mph
380 RWHP - 0-60: 3.89 1/4: 12.10 @ 120.51 Top: 196.18 mph
400 RWHP - 0-60: 3.81 1/4: 11.95 @ 122.66 Top: 198.10 mph
* Before anyone says "wait a minute...", here are the parameters that these numbers are based on...
1. 2,850 lb. curb weight
2. 0.29 coefficient of drag
3. Typical stock twin power curve
4. 2,000 rpm launch
5. Street tires
Basically, if any of these variables are changed, the numbers change. A lighter car will be quicker and have a higher top speed. Changing the power curve (i.e. single turbo) will obviously change the numbers. Launching at higher rpm on slicks or drag radials will result in lower E.T. in the quarter mile. Changing the differential gear ratio changes the numbers. In other words, changing almost anything changes the numbers.
The numbers are merely representative of what a stock twin RX-7 with P275/40-17 street tires could be capable of.
Note that the stock 220 RWHP car is slower with P275/40-17s... part of that is the increased weight of the tire and wheel, but more importantly, that added weight is located farther from the center of the wheel, making it more difficult to accelerate the mass. As you can see, an extra 20 RWHP overcomes it easily.
And How is your project coming along? I can't speak for everyone else, but I know I am dying to see that monster on the road.
Just for comparison, here are the numbers Car Test is giving me for my car on P275/40-17 street tires with a 2,800 lb. curb weight, Borg Warner "G92" T56 6-speed (Z06 gear ratios), and 2.80 ring and pinion in the differential, and a 1,000 rpm launch. Nope, that's not a typo.
570 RWHP - 0-60: 2.85 1/4: 10.97 @ 139.09 Top: 238.96 mph
Last edited by jimlab; 06-19-02 at 02:29 PM.
06-19-02, 02:32 PM
#89
Super Snuggles
Originally posted by Fd3BOOST
Look everyone it's Jimlabs true identity revealed!!!!!!!
Look everyone it's Jimlabs true identity revealed!!!!!!!
06-19-02, 02:39 PM
#90
Super Snuggles
Originally posted by DomFD3S
Jim
All this talk about the engine. I don't think you've ever mentioned a roll cage OR maybe I missed your post regarding it.
Jim
All this talk about the engine. I don't think you've ever mentioned a roll cage OR maybe I missed your post regarding it.
I didn't want to pull the windshield to get the maximum bar clearance or cut the dash, so I stopped short of a full cage. At that time I didn't think I'd need it, and I wasn't going for an all-out drag car. I wanted to keep the bars as stealthy as possible and have them interfere as little as possible with (potential) daily use. I've climbed over a fixed door bar often enough to know that it's a huge pain in the *** for a street car.
I don't plan on "upgrading" to a cage. I probably won't be using the car for track events or very seldom, wouldn't need it for autocrossing, and the first time I break 135 mph at the drag strip, they'll send me home.
Last edited by jimlab; 06-19-02 at 02:41 PM.
06-21-02, 08:02 AM
#93
Rotary Enthusiast
Join Date: Aug 2001
Location: Tallahassee, FL
Posts: 1,402
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by jimlab
I don't plan on "upgrading" to a cage. I probably won't be using the car for track events or very seldom, wouldn't need it for autocrossing, and the first time I break 135 mph at the drag strip, they'll send me home.
I don't plan on "upgrading" to a cage. I probably won't be using the car for track events or very seldom, wouldn't need it for autocrossing, and the first time I break 135 mph at the drag strip, they'll send me home.
Brandon
06-21-02, 08:40 AM
#94
Full Member
Join Date: Mar 2001
Location: elkview
Posts: 100
Likes: 0
Received 0 Likes
on
0 Posts
I did 152 while racing a auto c-5 on the interstate. It was a rare encounter cause i never have the luck to run into a good race. Come to find out it was the same guy that looked at my old 94 auto while i still had it for sale. He decided on the vett for reliability concerns.
06-21-02, 08:44 AM
#95
Banned. I got OWNED!!!
Join Date: Nov 2001
Posts: 1,571
Likes: 0
Received 0 Likes
on
0 Posts
My buddy just got a camaro over here. I believe the gauge said 210km was 160 or 165mph, They dont exactly have line for KM so its right around there, for anyone that was wondering...
06-21-02, 01:01 PM
#96
Full Member
Thread Starter
Join Date: May 2002
Location: Germantown, MD
Posts: 105
Likes: 0
Received 0 Likes
on
0 Posts
Jimlab....Thanks for the chart. Makes me realize my car really is slow. Nice to see that there are others out there risking their driving priviliges.
06-21-02, 01:34 PM
#98
Full Member
Join Date: Sep 2001
Location: EVERYWHERE
Posts: 222
Likes: 0
Received 0 Likes
on
0 Posts
150?
I'm not too sure, cause I am always amazed at how quickly your opponent gets really small in your rear view mirror or I always find myself slowing down to 90 then start the process again because some people just don't know when to give up...
see ya,
car 53
see ya,
car 53
06-21-02, 06:56 PM
#100
Super Snuggles
Originally posted by No7Yet
Uh, so you're basically saying that you'll get one run per dragstrip in the country? I hope you live near a bunch of strips.
Uh, so you're basically saying that you'll get one run per dragstrip in the country? I hope you live near a bunch of strips.