GTF Off the clock

[FTe217]

That was the GTF's issue not breaking 300 imo - it was noted by the time they got set up did the HO's run then the FG's air temps were rising as expected by mid morn.
IF they were ready to run and JB in the GTF @ 6.30 or 7am latest I reckon they would have gained that 3kph but never to be now.

Wish GM would have the gonads go to the same place and run the GTS, it would make great tribal bragging rights last forever, heck would Ian have feet in both sides suppose he'd be protected by his fellow wing man svman

[Road_Warrior]

[QUOTE=HSE2;61364different day different conditions.[/QUOTE]

And therein lies an inherent flaw with any such 'test', if the weather conditions are more favourable on different days then it is going to skew the result.

[FTe217]

The bogan fans won't agree RW.

[4Vman]

Is the stronger tailshaft heavier than the stock one?

[HSE2]

doubt it if its carbon fibre

[4Vman]

doubt it if its carbon fibre

So potentially a lighter tailshaft and improved airflow into the engine..?

[Franco Cozzo]

Its a bit of a shame the gtf didnt come with a 265 top speed to allow for an off the clock photo without the need for intervention.

I'm guessing half the reasons for speed limiters on cars is that you have to have tyres rated to the top speed of the vehicle, correct?

Tyres rated to 300km/h would probably be pretty damn expensive to replace, no? I imagine even GT-F owners would probably crack the shits if they need new tyres and it costs $3500 for 4 of them and there is a 3 week wait because the tyre joint has to order them in as they don't hold stock for them for example.

You see it all the time with BMW X5 owners and other luxury SUVs, they have a sook about paying anything over $1000 for new tyres, $600 for minor servicing, they fly off the handle and refuse to pay an extra $10 a tank for 98 so they put in 91 even though they're getting around in $100,000+ cars.

[HSE2]

I don't know but I suspect they have used the tyres on the GTF that it came with. They changed the tail shaft on the basic of safety so I would assume if these tyres were not up to 300 they would have changed them.

I will go check what rating is written on them.

[HSE2]

The tyres are good for 300 if I have read the rating correctly.

[Falc'man]

January 28, 2015 at 10:45 am by Don Sherman | Photography by Steve Siler, Roy Ritchie, and Michael Simari


How SRT Validated the 204-mph Top Speed of the Charger Hellcat
From the February 2015 issue of Car and Driver

Modern computer design tools can accurately predict a car’s EPA mileage, number of crash-rating stars, and top speed even before the first prototype is constructed. With several supercharged models knocking on 200 mph, simulations based on wind-tunnel studies are the preferred means for avoiding the risky business of actual top-speed measurements. Also, topping 190 mph on any U.S. automaker’s test track is difficult due to the tire scrub inflicted by their steeply banked corners.

Enter Erich Heuschele, the SRT vehicle dynamics engineering manager, who wouldn’t settle for a number generated by a simulator. Heuschele hustled the Dodge Charger SRT Hellcat to a 204-mph two-way average on the 7.5-mile banked oval at the Transportation Research Center (TRC) near Columbus, Ohio.




Heuschele, a champion amateur road racer and veteran Viper tuner, admits that his trip to the outer reaches was a riveting experience. “Driving 10.2 miles flat-out at TRC for 183 seconds definitely got my adrenaline flowing. I was shaking when I stepped out of the car after the runs.” Except for a bolt-in roll bar, a racing harness, and a fire-extinguishing system required by TRC, Heuschele’s Hellcat was stock. The tires were inflated to 40 psi to resist the extra loading imposed by the 28-degree banking. Three radar guns, VBOX test equipment, and one Harry’s GPS LapTimer recorded data. A medevac helicopter was on hand just in case.



Farther north, Cadillac warmed up the CTS-V on the 4.5-mile banked circle at GM’s Michigan proving grounds. One prototype topped out at 197 mph, held back by the tire scrub resulting from cornering at a steady 0.35 g. To prove that the car was good for more, GM engineers John Buttermore and Brian Wallace made the trek to TRC. Their test car ran 201 mph with the wind. But into the wind, the highest speed achieved was . . . 197 mph. That’s a two-way-average top speed of 199 mph. But we’ll give Cadillac the 1-mph break because we trust it will continue CTS-V development until the car is capable of topping 200 mph on a calm day.

http://blog.caranddriver.com/how-srt...arger-hellcat/

Just for comparison, that's 326kph with about 520kW for the Dodge, and 321kph with 480kW for the Cadillac.
Forty kilowatts to go an extra 5kph? The Cadillac looks like it has better aero.

And lastly the GTF hitting 297kph with 420kW, down 100kW and 29kph, or 50kW and 24kph.