I have not had a Viper since 1997. I have a 04 C5 Z06 use as a track only car. And have to agree the C5Z is not nearly as cool or solid as any Viper, more of a driver or fun track car with a few minor adjustments.
I have driven the C6 Z many times. It is a different car if you have not driven one yet, comparing a C5 Z to a C6 Z is very different in the power dept.
I too am tempted to add an ACR to the collection. I am not suggesting it is not a Bad Arse Machine. I am suggesting the ZR1 may have the edge in an apples to apples comparison at the ring or any other track.
As stated 4 seconds is not much in a 7 minute lap. It equates to about 1.2 seconds on most tracks we run here in the US. In a contest like this the driver is the key...."on any given Sunday" comes to mind. For most, the diff in a track tire vs. a great street tire is considered to be 4 seconds on a 2.5 mile track. Or about 10-11 seconds in this comparison.
For the record the ZR1 was wearing PS2's - tread wear 220
The ACR is wearing the PSC a near race compound - tread wear 80
Personally I am not ready to crown the ACR the king. I would not place any wagers on on either car in a heads up run. They are both awesome and too close to call.
Now, If I were buying either I would buy the ACR as I think it will hold it's value better and is a more exotic piece of art.
Its comical how alot of the viper guys get their panties all wet with excitement about going a couple of seconds faster around a 7 minute track than a ZR1. I bought a New ACR and I think its one of the most awesome american cars ever, but the ZR1 is just as awesome except in the looks department IMO and with the same tires and same driver probably would of run better times than the ACR IMO. That is a long track and with 30 mph more top end I don't know how the ZR1 couldn't beat the time on that huge long track with equal traction and the engine advantage? I race fairly often and anyone who races will tell you tires are probably the biggest factor to good performance, and of course a good pilot which I think both cars had. I personally think both cars are awesome and are pretty evenly matched on a race course from which I have seen, but I do think heat soak will be an issue for the ZR1 on any prolonged road course action as it has been for many of the Ford GT's that have posted here.
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