Greg A

What about the GT1?

Greg A

PorschePhD

Sorry, US street legal

Rassel

TopGear did a roadtest in July 2002. Some of the times shown where 0-60 and 0-130mph. So simple math...

12.8s Aston Martin Vanquish
11.2s Ferrari 575 F1
11.0s Lamborghini Murciélago
12.1s Mercedes AMG SL55 (476hp)
8.7s Pagani Zonda S7.3L (wow... thats quick.)
11.7s Porsche 996 Turbo S
10.8s TVR Cerbera 4.5 Red Rose

To add to this, there is also a car called Koenigsegg CCR. Some of you might have seen its kid broter CC8S on BBC Top Gear, it's supposed to be the fastest car they've ever tested. The CCR is supposed to hold the Guiness World Record for most powerful car in series production.

0-62mph 3.2s
1/4 mile: 9s End Speed: 146mph
Top speed: +242mph
Engine: 806bhp
Cd. 0.297 (Thats really low!) Fa:1.825sqm
Dry Weight: 1180kg



In february 2005 the CCR set the record at Nardo with 242.42 mph. (Anyone remember the 9ff figure?) Record run movie

Konstantin

GT1 60-130 is real 7 sec (or 5 sec according to the speedo)

Konstantin

LAT

Bill, I have one of these versions of the CTR2.
For fun, we could put the two RUF products back to back and see what happens. I live in Canada and visit Minneapolis regularly, I also plan to ship the car to the parade next year, possibly we could meet there.

Jean

Rassel
Interesting numbers, thanks for posting them. That CCR has the similar quartermile ET and trap speed as the documented 965 3.6 turbo of Joe Rordiguez, the video on the other post by Sameer. I am surprised at how "slow" the 575 Maranello is, far behind the Murcielago.

Konstantin, how can Porsche go so wrong with the GT1 speedo. A 2 second difference up to 130mph is huge! 20%? From what I have read previously speedo error on these cars tends to be around 5%. I guess the best thing is to cross-check with RPMs.

LAT, did your RUFs come with its own catalog and owner's manual?
What I mean is that I never had a chance to buy a RUF and wonder if the RUF "vinned" cars have their own manual since they are not Porsche in fact. Those manuals could have very valuable info I guess.

LAT

Jean, no such luck, I can't speak for other RUF cars, but mine came with a 993TT owners manual. Nothing in print from RUF in the glove box.

rmrmd1956

I previously posted some times utilizing a GPS based data collector. They are in line with the GPS data from the most recent Road and Track one mile shootout. I think the numbers posted from speedo videos, while really cool, are very prone to error(in the speedo, response of the needle, parallax of the video image to name a few). Here is the 60-130 times extrapolated from the article.
Lola Champ car 4.2sec
MV Agusta Tamburini 5.8sec
Saleen S7 Twin Turbo 6.1sec
Hennessey Viper 6.3sec
Daytona Prototype 7.2sec
TransAm jag 8.6sec
Ruf R Turbo(nardo) 8.6sec
Ruf CTR YellowBird 9.2sec
FordGT 11.1sec
Dodge Viper SRT10 11.6sec
Lamborghini Murcielago 12sec
Corvette 13.7sec

Even if they were not tested in ideal conditions, they used pro-drivers which I humble submit can drive better than us! The Hennessey viper had 1000HP but 'only' ran a 6.3sec, slower than the 1liter sport bike.
The Ruf nardo ran a 8.6!
The EVO750 I drove ran a real 7.2sec and I ran 9.5 in my modded GT2.
We all need to get GPS based data collectors, run our cars again and restart this thread.

LAT

I agree with the above, videos are subject to lag error and accuracy error as well.

As I found out even GPS units are prone to false readings if not programmed and set up properly. They are not just plug and play, at least not the XA/22 and it is one of the easiest to use.

I am still waiting for the right time, meaning weather time of day etc to rerun my CTR-2, I suspect after reading the R&T article Iwill end up in the 8 to 9 sec range and not the 7 sec range I was originaly hoping for.

How much power does the EVO750 put out to the crank or ground?

Jean

rmrmd

I have not looked in details, but I picked up only the CTR and this is what I can gather, I don't know how you calculated the numbers above so maybe you are right and I am wrong, I did a guesstimate:

RUF CTR
0-60mph: 4 sec.
Quartermile 11.8 sec. trap speed 128.2mph

60-128.2= 7.8sec=> 130 mph around 7.9-8 sec.? Whereas you are saying 9.3 sec.
I have not looked at the whole test therefore maybe I am missing something.

The R Turbo is shifting 3 times from 60-130 MPH, these test drivers are not specifically timing 60-130mph. If they had done with 2 shifts, or maybe one, the results would have been very different. (please see Bill S. results difference)
Concerning the accuracy of the speedo, while not accurate, when matched with RPMs it can give a pretty good acuracy, IMO much better than the subjective calibration of the GPS accelerometers which can lead to inaccurate results.

But each one I believe has his own POV. I personnally trust a video more.

TB993tt

The CTR yellowbird was timed by during a shootout in the late '80s at 11.7 s with a 133mph trap speed - so thats 60-130 in the 7's for sure

Konstantin

do not forget that some CTRs had more power than the 469 HP.
Especially the car in Nardo which made the 342 km/h had easily over 500 HP.

Konstantin

edpurplett

Gents,

Since I think the right crew is on this thread for theory and application...of HP, times, gear ratios, number of gear shifts..

A coupla of you probably know my specs.. but I quick redo for relevency's sake...

930, TT, EFI, Twin Plug, BIG IC, Cams, ported everything, Pressure sens, etc, etc.. and most importantly (I think) for my questinos is a stock geared G50/50 with 295/35 18's...7200 RPM redline.. for arguements sake say mid 600's on HP and last time I weighed her.. in the 2750 range with 1/4 tank

Current speed in gears approx: 44, 90, 138, 177, 218 ..

Depending on temp I run in the 7's or 8's pretty easily on the 60-130.. and for the horsepower/weight I think it's very good... but I think it's partially because of the one shift... the car is on full boost at 60 although it pauses for a mere fraction(copmared to right before) at the start of third with the large ratio spread..

Any guesses if I narrow 2,3,4 significantly what the effect will be if I introduce possibly one or two additional shifts? I've been debating this for over a year... with the additional benefit of backroads burning, but don;t want to shorten the R/P because 1st is perfect with this HP... and the quick spool of Super 60's...

Thanks, Ed

Fastest928

There is an event in the US at www.openroadracing.com that is a 1KM drag race. It may be a good setting for a informal shoot out. Anyone interested?

I think they also did a 0-200-0 event, using a mile as the acceleration zone. I do not think anyone got over 180 mph...

Jean

Marc, I wish I could attend that event! TB, I was just pointing out a correction about what rmrmd posted.
Ed, You have one beast of a car, the mods on it are maybe the most extensive I have ever seen on these boards. Full boost at 60mph in 3rd?(Edit: re-read your post, it is in second) I think you will always be better of by shifting once less if you are targeting a 130mph for instance. In fact you can have shorter gears, taller tires, and a 7400RPM rev limiter, that take you spot on to the 130mph or so, that would be the best combo I believe. My rev limiter and tire combo takes me to 134mph in 4th gear so I can shift only once in 60-130.
It all depends on the target speed you want to run. For the quarter, if you are to reach 140 mph, get your gearing accordingly to take you there at the limit of your rev limiter in third gear..