True, and I think the variance will be less with the GT2 due to it's rear weight bias being more favorable for launches. It will be interesting to see where the trap speeds fall as others have been in the low, low 130s with the ZR1.

 

Just beat around in a ZR1 how terrible. Seriously, you already own the two most iconic longest lived sports cars ever made, the vette and the 911. What else could you want? ok, dumb question...Zonda, CGT, Enzo, CCX, well you know what I mean

 

I can't speak of the GT2RS because I haven't driven one but I can say the ZR1 times posted above 0-124 in 11.5 seconds is somewhat comical to me, as I have on 3 different tracks, at 3 different times of year including early summer (June) run 10 second 132 mph plus in my bone stock ZR1 on stock tires and not just MIR in Maryland which isn't always optimal itself. Obviously with the right driver the car will for sure go from 0-132 in under 11 seconds with most experienced corvette drivers, and I am not the only one who has run those numbers, several guys at the events I raced at equaled my times. Also all those runs were not done in the best air, da etc. some were done in 80 degree weather without the best air and traction right on the edge. Also the comparison numbers used in this post are the absolute worst I have ever seen for a ZR1, and same day and same driver is good if the guy can drive both cars equally as good but that usually isn't the case as a Corvette driver will usually drive the Corvette better and the Porsche Driver will drive his Porsche better than he drives a Corvette. I also have a GT2 albeit an older one, but it does make about the same HP as my ZR1 according to TPC Racing's Dyno which would put the (HP to WGT ratio probably right about the same as the GT2RS) and at the dragstrip the ZR1 runs pretty much the same et's and mph with me driving both cars. The GT2 is much easier to launch with the rear engine weight as far as traction goes, but the short gearing makes shifting more difficult but is doable, and the ZR1 is very difficult to launch and traction is an issue to the 500 ft mark at the track and many runs have to be aborted before the 1/8th mile because of traction issues. For me in my experience and I have a lot, most Factory cars with 600 advertised horsepower within a couple hundred pounds weight of each other are going to run pretty similar straight line numbers with a very slight edge going to the car with the better HP to WGT ratio, the biggest differences will be driver. I take what I read in a magazine with a grain of salt because all media is biased and have an agenda or slant to whatever benefits thier position the most, and for sure in the real world the difference between the GT2RS and the ZR1 to 125 mph is 2 or 3 tenths not seconds and I am sure the difference to 186 will be shortened significantly as well.

 

Jamie,

That particular test is slow for the ZR1, I agree. However, in the test I posted in the very first post of this thread, the ZR1 had a very good launch (0-124 in 9.8), but the GT2 RS still ended up beating it by 3.5 seconds to 186 mph.

In a nutshell; I think if you owned a GT2 RS, you would run a faster time than you ever have in your ZR1, simply because I think the GT2 RS is the more capable car.

There is one sure way to settle this: you should go buy a GT2 RS and run it at MIR in October/November. Just let me know when you go so I can line up with you in my car.

 

Well l agree with everything you said, and I also would take the GT2RS any day over the ZR1 but I still feel the ZR1 is one of the fastest production cars out there and one of the best looking also IMO. As far as lining up against you with a GT2RS I think I would need to go visit Mike first at TPC if I ever get one of those RS's. In the meantime we can just go have fun at MIR at a few of the rentals, as I don't have anything for that GT2 of yours!

 

From 124-186 the RS's better drag coefficient, smaller frontal area and likely understated hp numbers will do that. Corvette's have never been particularly top end machines. While the ZR-1 somewhat addresses the woeful Z06 top end gearing, it's still pretty high in drag for it's stature, and has quite a wide frontal area. That's a lot of resistance compared to the smallish frontal area and lower drag of the Porsche. Which is pretty crazy considering the GT2 has a wing on the back which will add significant drag to go along with the DF.

Some cars are just special on the top end, for example BMW M's have some sort of special sauce on them that makes them insane on the top end. I think mechanical drag is often overlooked in these areas as well as they put a hurting on acceleration when you can't hp through them.

GM has been outclassed in aero efficiency for years. The Viper is even worse. And it shows on the top end acceleration numbers.

 

If you think the interior is what separates the two apart, then more power to you

Scott thanks for posting that up, quite a difference as the speeds climb up, RS is FASTTTT!

 

Jamie,

I'm looking forward to it!

 

Good post, Dez. I agree with all of it.

 

Just to clarify the fastest stock ZR1 1/4 time is 10.74 @ 133 and it was not run by Jamie or Ranger who hold Z06 records. Though I think Jamie holds the current stock ZR1 drag radial time. I ran a 10.85 @ 130 and before I started running the ZR1, I had maybe done a handful of runs with a manual tranny car at the drag strip in the past 10 years. I held no records thats for sure and then became the first to hit 10s in the ZR1. I am not the level of drag racer as some of those guys and it shows in my trap a little. I did figure out how to get a good launch sometimes and that has got me my 10s. The day you had to leave early we had all 4 stock ZR1s run a 10 sec time with different drivers. Jamie is correct about the private rental allowing you the runs you need to figure out the car.

 

The ZR1 does have revised gear ratios, but we failed to hit on one thing that IMO is not being said. I believe that the Porsche 911 GT2 RS has more than 620 flywheel horsepower, especially consider its faster in the speed range that is more about POWER then gearing or traction.

Is the GT2 RS the better car, yes I believe so in consideration of rarity and build quality....and getting to drive the best Porsche 911 ever made in Stuttgart. But all of that aside, for the price difference the ZR1 is the best car to ever cost what it does for a bone stock factory car.

If I you guys are all pitching in I will take a 2011 GT2 RS , but if I am paying. I will take a ZR1.....add Carravagio seats...and buy a dedicated track set of CCW's with Hoosier R6's. And Moton CS suspension if I am really feeling like doing track days. As far as the 2.5 seconds 0-186 I am sure an APS twin turbo kit with better GT series ball bearing turbos should work just fine!

 

Also one thing to keep in mind the ZR1 will spin tires well into freeway speeds bone stock, where as the GT2 RS and its rear weight bias is much better at putting the power down. So driving the cars back to back and not knowing what to expect I can understand the time differences.

 

Please get me one while you're at it. I'd love to have that ZR1 in my garage!

 

The ZR1 does very well at higher speeds, but at some point the sustained high revs does start causing heat soak and the supercharger efficiency to drop and the IAT's to rise. I am curious as to what someone who knows that their doing in a ZR1 would improve on the 0-300 km/h time. Corvettes can be very good at high speeds when modified, I mean does no one remember the Callaway Sledgehammer? 254 mph way back then with the C4 bodywork.

I think that perhaps a modified C6 Z06 would be the better car with a modified LS7 for sustained high speed driving. It would need a much deeper rear end than the 3.42 gears supplied from the factory. I can't wait to see a GT2 RS on the dyno, I can bet that its putting more to the ground than the ZR1. I would not be surprised to see dyno numbers between 580 and 600 rwhp.

 

germeezy 1,we all know a corvette is a outstanding car specially the great ZR1,i really like corvettes and for the price is a bang for the buck.What has been said here is that the GT2 RS is a better car,but again we know and we are sure ZR 1 is one of the best cars in the world.