Ive been to 155 a few times....in a row! lol

pushing into fifth gear gets scary....


j

 

Dont base and touring have the same coefficient of drag? Because they're the same externally, except the sunroof.

 

Base and PEP are externally the same, with no rear spoiler. Touring models had the rear spoiler as an option, but most had it installed, I believe, and of course it came standard on the R-models.

 

****. Double post... goddamn forum hiccups.

 

Naw, just providing a complimentary reality check.

 

So you're ready for your top speed run I take it?

 

hahahah, those numbers actually look coorect, genius!

 

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

 

Look everyone it's Jimlabs true identity revealed!!!!!!!

 

I rounded some, here are the corrections.

125.921053 knots (UK)
6482.08 cm/s

Nothing more annoying than a bored engineer, eh?

 

Nope.

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.

Waiting on the engine builder to have time to dedicate a day or two to final tuning of my engine in the dyno cell right now, and there are several other things that I'm waiting on, not to mention that the car will be painted next month, hopefully.

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

 

You guys way lost me. I'll just take your word on 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.

Dom

 

Sorry, I can't make anything out of a bag of Dorito chips and a pack of playing cards, but the real MacGyver could build a shoulder-fired anti-tank weapon out of the same stuff...

 

I believe it was mentioned in the "Latest progress..." thread, but it would have been easy to miss it in the volume of information. I had a custom 5-pt. Chromemoly roll bar installed in '98, with 5-pt. harness mounts for both passenger and driver. The interior panels were cut to fit around the bars, and the entire interior was reinstalled.

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.

 

165 MPH

 

162ish (was looking at road), 2am on a cool night. 93 R1 stock.

 

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.

Brandon

 

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.

 

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...

 

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.

 

I forgot that one time I went by GZ91RX7 at about 160....and man was his girlfriend pumped.

 

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

 

fastest in my FD was like 140
fastest in my TII is 150
i'm not quite as crazy as most of you guys going 170 LOL

 

Well, I can get in a few ~1/8th mile passes and just coast the rest of the way to get the launch down without getting booted, and then just take one full-power pass on camera. I didn't build the car for drag racing, though.