Hennessey Cadillac Tuned Hits 220 mph on Texas Highway

[Renegade]

Hennessey-tuned Cadillac hits 220 mph on Texas highway.

Texas tuner John Hennessey's work on big Detroit iron has its acolytes and detractors, but the man knows how to show off his wares. To highlight the top-speed performance of some of his big rigs, Texas authorities let him take a full-speed blast down the state's newest toll road outside Austin that opened today, one that features an 85-mph speed limit. It's just long enough for the 1,200-hp, twin-turbo Cadillac CTS-V coupe to hit 220.5 mph.

Hennessey told Jalopnik that the stunt came about after a conversation with state officials and an offer to test out a toll tag system to see if it could accurately report fines at triple-digit speeds. In addition to his 1,200-hp CTS-V coupe, Hennessey also brought a 707-hp Chevy Camaro ZL1 that managed to hit 203.9 mph along the same strip, with an even better sound. Hennessey says the CTS-V might have done 230 mph had he been granted another mile of tarmac.

And for the record: All of the electronics used by Texas state officials, including their radar guns, worked perfectly during the run. Word to the wise: 85 mph will probably be fast enough.

[TaylorRyanSS]

@ 10 seconds

[Renegade]

Originally Posted by TaylorRyanSS

@ 10 seconds

Kinda takes your breath away right?

[CHMSC]

Wow

[TheReaper]

Bad ass......I want one.

[TheCaptain]

I'm not a fan of turbo power or sound at all, but its still a great feat!! It doesn't even look like he's going that fast!

[mr_honez]

Freaking Awesome.. WOW.

[Captain Awesome]

The ZL1 wasn't quite this fast. Is that due to aero issues?

The ZL1 sound is way cooler... like a jet engine. Not a fan of the turbo sound.

[CamaroDreams07]

Originally Posted by Captain Awesome

The ZL1 wasn't quite this fast. Is that due to aero issues?

The ZL1 sound is way cooler... like a jet engine. Not a fan of the turbo sound.

1200>700

*In life, there are no nandroids*

[Captain Awesome]

Originally Posted by CamaroDreams07

1200>700

*In life, there are no nandroids*

I was thinking the HP numbers were a lot closer than that because the top speeds are not that far apart. 500HP more should account for a bigger difference than 17MPH, right?

[CamaroDreams07]

Originally Posted by Captain Awesome

I was thinking the HP numbers were a lot closer than that because the top speeds are not that far apart. 500HP more should account for a bigger difference than 17MPH, right?

Well, if I recall correctly, when bugatti wanted to add 5 or so more mph to the veyron, they had to add something like 200 hp. Once you get to those speeds air becomes more like driving through molasses so it takes a lot more power to go from 200-220 than it does from 50-70.

*In life, there are no nandroids*

[Captain Awesome]

Originally Posted by CamaroDreams07

Well, if I recall correctly, when bugatti wanted to add 5 or so more mph to the veyron, they had to add something like 200 hp. Once you get to those speeds air becomes more like driving through molasses so it takes a lot more power to go from 200-220 than it does from 50-70.

*In life, there are no nandroids*

Drag is proportional to the square of the speed of the moving object.

FD=1/2ρv*2CDA

FD is the force of drag, which is by definition the force component in the direction of the flow velocity

ρ is the mass density of the fluid

v is the velocity of the object relative to the fluid

A is the reference area

CD is the drag coefficient

Since everything else is the same except for velocity, the drag is directly proportional to the square of the speed.

So the drag on a car going 203MPH versus 220MPH could be expressed as

41209/48400 = 85.1%

In theory, it should take just under 15% less horsepower to get the identical car moving 203MPH instead of 220MPH.



So, there must be other losses at work here...

[knowitman]

If you watch the video, the CTS-V was still accelerating when he backed off at 220.5 mph. He just had to back off since they were only given so much distance to actually do the test.

[Rangore]

Awesome car!!


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