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2015 GT-R Nismo vs. 2015 Corvette Z06 at Willow Springs!

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A5 said:
#2 seems a bit more reasonable. Chevy (hopefully) wouldn't be dumb enough to overstate the power on something like a Z06 that is going to be put on dynos all over the country.
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Nissan uses an accelerometer activated vtec to sandbag dyno measurements
 
A5 said:
#2 seems a bit more reasonable. Chevy (hopefully) wouldn't be dumb enough to overstate the power on something like a Z06 that is going to be put on dynos all over the country.
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It isn't overstated, but the aero makes quite a bit of drag to provide downforce. It doesn't accelerate very fast after 135MPH (a speed at which weight is less of the equation than drag) or so in the Z07 trim. I'm a little confused with Pobst running it in sport though instead of one of the various track modes.
 
Wuzup101 said:
https://www.youtube.com/watch?v=ca6_fkLnZ2Y

For the hell of it... look at that launch (z06 on drag radials with basic mods, tune, and e85). 10.08 @ 139 on stock boost. Hooked up pretty damn good.

Note: this is barely on topic lol
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Heh basics mods. Forced induction always > Naturally aspirated when it comes to making easy power.
Want a lot more power with FI? Just turn up the boost, want even more power? custom tune and race gas/e85!
Miss my 240sx with pte 6765.
 
It's unfortunate, but the Z06 looks to be struggling with an over aggressive pulling of timing when IAT's get high. Even if GM goes back and improves things, it's too late to overcome the initial tests.

For perspective, the GTR ran a crazy time, I believe beating the Porsche 918. These cars are competing to be the 1%er's of the car world.
 
KentState said:
It's unfortunate, but the Z06 looks to be struggling with an over aggressive pulling of timing when IAT's get high. Even if GM goes back and improves things, it's too late to overcome the initial tests.

For perspective, the GTR ran a crazy time, I believe beating the Porsche 918. These cars are competing to be the 1%er's of the car world.
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Interesting. Could it be California and our crappy 91 octane?

Im wondering if they ran with traction control on. Maybe the gtr does a better job putting the power down on corner exit with their version of traction control. Not really to keen on this idea since the guy doing the hot laps is a pro race driver
 
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For a 7 year old platform the gtr does not disappoint, can only imagine how much faster the r36 will be.
 
lsd said:
Heh basics mods. Forced induction always > Naturally aspirated when it comes to making easy power.
Want a lot more power with FI? Just turn up the boost, want even more power? custom tune and race gas/e85!
Miss my 240sx with pte 6765.
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Well yeah of course. This was headers and a modified intake with a flex fuel sensor added and an e85 tune. Of course drag radials make a sizeable difference (I mainly posted it for the awesome launch). That being said... This was with stock boost levels. It'll be interesting when they do turn up the boost.
 
brainhulk said:
Interesting. Could it be California and our crappy 91 octane?

Im wondering if they ran with traction control on. Maybe the gtr does a better job putting the power down on corner exit with their version of traction control. Not really to keen on this idea since the guy doing the hot laps is a pro race driver
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They actually didn't run the vette in track mode which is a bit confusing but Mr Pobst knows what he is doing and has driven the z06 before (along with pretty much every other model lol). I'm sure he realized what mode he was in. I don't think this was an accident. I do think we might see a service bulletin tune at some point for the z06. That being said the gtr is awd and has an undeniable ability to put power down on the corner exit. It doesn't matter what sort of traction control the z was running... The gtr is flipping fast out of the corner and everywhere else.

The only thing that I was surprised about was that the gtr seemed to out accelerate the vette even on the straights. Maybe because of the vettes down force... Or a combo of that and pulled timing. Unfortunately there is a lot of speculation around and I don't own either car lol. Both cars are obscenely fast.
 
KentState said:
It's unfortunate, but the Z06 looks to be struggling with an over aggressive pulling of timing when IAT's get high. Even if GM goes back and improves things, it's too late to overcome the initial tests.

For perspective, the GTR ran a crazy time, I believe beating the Porsche 918. These cars are competing to be the 1%er's of the car world.
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Well the Z06 was only 0.1sec faster than the GT3 which has nearly 200hp less and the GTR lost to a 560hp 911 Turbo in a drag race, so i don't think it is the power. I think it might be a combination of the gearbox and maybe struggling to put the power down for the Z06.

Also, the GTR was about 2.5sec slower than the 918 at Willow and just under 5sec slower at Laguna. As fast as the GTR is. The hybrid super cars are in another league.
 
uclaLabrat said:
so the car can go faster even though there's less energy in the fuel?
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Pulling timing it seems has a greater effect since the spark plug is not firing at the optimum stroke position

Cooler temps also allow you to send in more air
 
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uclaLabrat said:
so the car can go faster even though there's less energy in the fuel?
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You just dump a lot more e85 in there which makes up for the lower energy content. e85 has ~80% the energy of gasoline per gallon but ethanol can handle an air/fuel ratio of ~7:1 where gasoline is closer to 12.5:1 for optimum power. That means you can shove a lot more e85 through your engine and in turn make more power than gasoline (even taking the lower energy content into account).

Plus as others have mentioned, ethanol burns very cool and lowers intake temps which further increases power potential, especially on a hot PD blower like the Vette has.
 
uclaLabrat said:
Why would running e85 give better times?
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like many have said... e85 burns ALOT cooler, which allows you to run more timing (less detonation chance)

my gtr on 93 would trap 135... on e85 (closer to e92ish) it trapped 141... equated to ~.5seconds in the 1/4 mile on stock turbos (you can read more about it in my sig)

the downsides to e85 is the availability (depending on where you live), and it burns ~40% more gas... so you need a beefier fuel setup
 
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This comparison is a GREAT example of what every paper-racer fails to consider: confidence. The GTR has been annihilating lap times since it was introduced because drivers feel so damn confident taking it right to the edge, knowing that they won't get bitten.
 
uclaLabrat said:
so the car can go faster even though there's less energy in the fuel?
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Less energy per unit volume, but more fuel is added.

The extra fuel volume, higher heat capacity, and much higher heat of vaporization is what gives ethanol the advantage in power performance despite it's lower energy density.

Then there's always the argument "but there's less air in the cylinder because there's more fuel!" well, technically yes, but if you do the math it's on the order of 1%. Trivial.
 
JCH13 said:
This comparison is a GREAT example of what every paper-racer fails to consider: confidence. The GTR has been annihilating lap times since it was introduced because drivers feel so damn confident taking it right to the edge, knowing that they won't get bitten.
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Yup, you see that in the corner speeds. The Z06 is significantly faster through any corner under 100 MPH, indicating higher mechanical grip, but over 100 MPH the confidence (and maybe the wing) allows Pobst to push the GT-R significantly quicker. That and the GT-R's AWD corner exits blitzes were enough to make it faster, despite having less cornering grip and no real straight-line acceleration advantage.
 
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