Motor Trend vid: GT-R NISMO vs Z06

[r0tor]

So they just suddenly add 10 lines of code totally screwing everything up right before production?

Stranger things have happened.  Perhaps near then end there was a serious concern about engines having issues and production deadlines needed to be made.... Not like GM would ever do something wrong...

[12,000 RPM]

Its an improvement. Old GM would have just let the engines blow up and blamed the users.

[GoCougs]

I want to know how much power is being cut....

That's the crux of the problem - no real analysis so people are guessing (and each to their skewed POV)...

[SVT666]

Intentional is perhaps worse than it being a glitch.

Intentional is definitely worse.  It means the powertrain is under engineered and the engineers needed to protect it from blowing up.

[FoMoJo]

Intentional is definitely worse.  It means the powertrain is under engineered and the engineers needed to protect it from blowing up.

Reminds me a bit of the old (circa 1980s) F1 qualifying engines that would last about 5 laps before blowing up.  They over-boosted them to get a better grid position and then swapped in a another engine for the race. 

[MrH]

Do we have any actual data?  Or are you guys just reading a bunch of posts from corvette forum?

Have they put a car on the dyno, shown at least comparatively (since we all know dyno data is garbage ) that there is a huge cut in power, and then proven what the trigger point is and what it's causing?

ie. Intake temps > some temperature is causing the timing to adjust, resulting in 20% loss in power.

Or has anyone even dyno'ed a car post break in repetitively to see if power is actually being reduced?


Absolutely nothing in the Motor Trend video shows power is being reduced.

[MX793]

Absolutely nothing in the Motor Trend video shows power is being reduced.

For the last time READ THE ARTICLE

Here, I'll post it again:

Add to that the Z06's tendency to get hot after one lap and the computer's decision to reduce power to compensate, and you have a lap slower than expected.

Read more: http://www.motortrend.com/roadtests/coupes/1504_2015_chevrolet_corvette_z06_vs_2015_nissan_gt_r_nismo_comparison/#ixzz3RIOF5H7u

[12,000 RPM]

Holy crap, MX793 is right. That quote came right out of the article

[FlatBlackCaddy]

For the last time READ THE ARTICLE

Here, I'll post it again:

I just rewatched the video. I don't see where you are getting that from since they never once mentioned anything about a loss of power.

[r0tor]

Most horsepower guestimators would say the Vette only had about 550hp show up based on its trap speed and weight... So I guess making 650hp even for 10 seconds is generous.

[Gotta-Qik-C7]

Holy crap, MX793 is right. That quote came right out of the article

I just rewatched the video. I don't see where you are getting that from since they never once mentioned anything about a loss of power.

I think they put that in from the previous write up! I don't see why Probst wouldn't mention a power loss while driving.

[Tave]

I didn't think the existence of the power loss was in question. GM already said in essence, yeah, we had to retard the ECU to help it meet emissions standards.

[SVT666]

I didn't think the existence of the power loss was in question. GM already said in essence, yeah, we had to retard the ECU to help it meet emissions standards.

The apologists don't even believe GM.

[Raza]

stiff in the rear.

[12,000 RPM]

I didn't think the existence of the power loss was in question. GM already said in essence, yeah, we had to retard the ECU to help it meet emissions standards.

Cougs ain't coming back

[r0tor]

Hilarious they admit to detuning the engine for emissions or durability, but then don't change the HP rating. 

I got a $500 gift card from Mazda about 10 years ago from the same basic circumstance.  But that was over 10hp, not 100hp.

[GoCougs]

Back? You haters are failing miserably. What more can I do?

[SVT666]

Back? You haters are failing miserably. What more can I do?

You apologists are hilarious. Defending a safety measure that should not be required and no other production car has, and only when you aren't denying it even exists even though GM admits it's there.

[AutobahnSHO]

Back? You haters are failing miserably. What more can I do?

concede.      

GM built a defective car. It's still ultra-sweet, even with it's defects, but it's still defective.

[SVT666]

concede.      

GM built a defective car. It's still ultra-sweet, even with it's defects, but it's still defective.

Exactly.  I still dig the car, but the engine management is really flawed.

[MX793]

Hilarious they admit to detuning the engine for emissions or durability, but then don't change the HP rating. 

I got a $500 gift card from Mazda about 10 years ago from the same basic circumstance.  But that was over 10hp, not 100hp.

In a lab environment on the dyno, it makes the advertised power.  And I'm not sure the SAE would let them advertise a lower level than what it tested at and still claim the figure to be SAE Certified.  IIRC, manufacturers are only permitted to adjust the number a very small amount (like 1-2%) from what was measured during the test to account for variation between motors due to tolerances, etc....  In reality, they probably should have detuned it to a level that they could reliably achieve both in the lab and in the real world rather than coming off as somewhat disingenuous.

[Cookie Monster]

Exactly.  I still dig the car, but the engine management is really flawed.

Meh, after seeing the GT350R and GT4, any want of the Z06 went out the window. Yeah, yeah, not exactly competitors, but still. Plus seeing the Z06 getting its ass handed to it on the track vs the GTR made me quickly lose interest in it.

[Gotta-Qik-C7]

Meh, after seeing the GT350R and GT4, any want of the Z06 went out the window. Yeah, yeah, not exactly competitors, but still. Plus seeing the Z06 getting its ass handed to it on the track vs the GTR made me quickly lose interest in it.

You're acting like it lost to a Miata. 

[FoMoJo]

Back? You haters are failing miserably. What more can I do?

Yet another GM bested by a TT V6.

[Cookie Monster]

You're acting like it lost to a Miata. 

It lost to a car with 50 less hp, 500 lb more and sitting on an 8 year old chassis by a big margin. Sorry, I'm not very impressed.

[FlatBlackCaddy]

And it lost to a japanese car of all things, those people only make a bunch of FWD economy cars.

If you can't even beat the japanese then beating the germans and italians is totally out of the question.

Ohh wait, I forgot how we are supposed to treat the corvette.

If it loses then we can only compare cars that cost the same or less than the corvette. But if it wins then it's a "giant killer" and price doesn't matter, unless a car costing the same as the one it beat wins against the corvette then we go back to price comparable criteria.

[Gotta-Qik-C7]

It lost to a car with 50 less hp, 500 lb more and sitting on an 8 year old chassis by a big margin. Sorry, I'm not very impressed.

OK!

[Cookie Monster]

OK!

Don't get me wrong, I'm not a GM hater. I still absolutely love the Z28 and would take one over the Z06 any day. I just think they dropped the ball on this one.

[MexicoCityM3]

I am taking the side of the haters on this debate. I think it's hugely disappointing that the Z06 cannot hold stated power for a few laps.

As a side note, on our track day at COTA there were a few rented auto regular Stingrays. They all overheated (tranny).

That sucks.

[AutobahnSHO]

As a side note, on our track day at COTA there were a few rented auto regular Stingrays. They all overheated (tranny).

That sucks.

Ok, I can honestly say I've always wanted a vette. Until I read that.
Utterly and absolutely pathetic.