CaryBob

zhopper05

"Post Left Intentionally Blank"

phantasms

I'll throw this here in the mean time till that gets resolved. Not sure if this a repost. Was busy today.

qlawson

I believe this is the intended video

keagan

Thanks OP, should clear up some stuff regarding times for the ring. I would love to hear Jim's take on the lap. That car is a beast!

keagan

Thanks Gene, yeah it's been posted but buried in my VIR thread somewhere around page 11/12.

phantasms

zhopper05

qlawson

And apparently a couple more videos from his presentation

mirage2991

Couple things:
VIR was repaved and that accounts for 2 sec
the new cup tires account for the other 2 sec (per michelin testing)
but shhhh don't tell him that lol

heavychevy

Actually Tadge says that in the first video..........


signed

- new Z07 fanboy



P.S. the tires seems to be the bomb. I remember reading a post somewhere where a michelin rep said the new mpsc were as fast or faster than R6. I chalked it up to sales tactics. But this car is fast in every corner, ones where aero does next to nothing. The tires are glue.

Snorman

I would seriously have to see the data on this.
S.

dvandentop

very nice what was the event that these were shot at?

jvp

This was the media event that I hinted was going to happen. The journalists and audience members were told some other interesting thing about the car as it compares to the previous gen. But apparently no one has seen fit to print it or share it yet. Ah well.

And for anyone that thinks a VIR repaving and widening is going to be good for two whole seconds, you're sadly mistaken. And living in some sort of imaginary world. Two seconds, even on that track, is an eternity. It may make a difference in fractions of a second, but not whole seconds. Further, using the wider parts of the corners significantly upsets the car; just watch as Mero crosses the old gators to make use of the wider track in a couple of those corners. The car heaves quite dramatically.

heavychevy

I agree, but it's hard to argue with the braking distances and cornering speeds this car makes.

You just don't set production car records (C&D) in braking distances at 3500+ lbs without massive grip. Which ultimately boils down to the tires.

I just don't see sustained 1.2 lateral G and 128 ft 70-0 on anything less than phenomenal tires.

heavychevy

The track is undoubtedly 2+ seconds quicker. Complete fact. You underestimate a good surface vs an old crusty one. Turn 1 used to be like ice, especially in the braking zone. It was easy to miss or even go off there. Wider nascar and oak tree leading onto the straight are huge, I think wider entry to esses too.

Using the bumps does not upset the car much, it looks worse than it is, but you can absolutely stay in it. The extra MPH through the corner is most certainly worth it.

DREAMERAK

I think this two second Cup2 stuff is mixing up info provided by Michelin saying the 997 GT3 was 1.8 seconds quicker on Cup2, which have specific construction for the GT3. Just because a GT3 1.8 quicker doesn't mean the Corvette is.

http://www.michelinman.com/tire-sele...2/tire-details

jimmyb

+1

You understand that this "new" math is coming from the C7 Z06 lap time being 4 seconds faster than the C6 ZR1....so, you give the new Cups credit for 2 seconds a lap and the re-paving 2 seconds a lap and BINGO, the C7Z06 is no faster than the C6 ZR1.

Jimmy

DREAMERAK

I thought only about 30 percent of VIR was widened/repaved, not the whole track?

heavychevy

All of the full track was repaved. Only the middle section of the grand course was not. The full course itself is worth 2+ seconds. The grand course uses all of the full course where time would be gained.

The full course is 3.2 miles, the grand course is 4.2 miles. So there is an additional mile of non-repave surface.

Only a few parts were widened which may be where the 30% came from.

It's hard to say. Porsche's MPSC spec has always been slower than the off the shelf MPSC. It has additional grooves for rain channeling and a slightly harder compound as it's always raining or cold in Europe. And OTS MPSC are almost useless in either. there are countless accounts of guys switching from N Spec (Porsche spec) MPSC to NT01 or R888 and going faster. And neither are as fast as true MPSC. If Porsche were less conservative on the compound this time around the tire could have picked up substantial time.

However, the braking G's and cornering speeds are still indicative of an extremely grippy tire. Not to mention real world reports of time gained from switching to MPSC 2 from MPSC on Corvettes. I only saw the last part posted though, can't confirm one way or the other.