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Re: Nissan GT-R's on Dynos
''This car performed nearly identically to the fourth car. It smoked the quarter-mile in 11.6 seconds at 120 mph and produced 420 wheel horsepower. We also measured the turbo boost pressure in both cars, and the curves were basically identical.''
420 whp plus 15% drivetrain loss = 480 hp at the crank
420 whp plus 15% drivetrain loss = 480 hp at the crank
Re: Nissan GT-R's on Dynos
It will be interesting to see the actual crank hp of the GTR when it is eventually accurately measured. Until then it is a guessing game as no-one knows the exact drivetrain loss on the GTR. Nissan have said it is only 10%. Others say 20%. My guess is about 15%.
The GTR may well have a bit more than 480HP but this is not the main factor in its stellar track performance. This is mainly due to the way it gets the power onto the tarmac.
The GTR may well have a bit more than 480HP but this is not the main factor in its stellar track performance. This is mainly due to the way it gets the power onto the tarmac.
Aug 21, 2008 11:28:45 AM
- JoeRockhead
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Re: Nissan GT-R's on Dynos
Quote:
AUM said:
It will be interesting to see the actual crank hp of the GTR when it is eventually accurately measured. Until then it is a guessing game as no-one knows the exact drivetrain loss on the GTR. Nissan have said it is only 10%. Others say 20%. My guess is about 15%.
The GTR may well have a bit more than 480HP but this is not the main factor in its stellar track performance. This is mainly due to the way it gets the power onto the tarmac.
Telling everyone that the drive line only reduces power by 10% is a great way to say you've only got 480HP when in fact you have 520.
Aug 21, 2008 11:58:53 AM
- AUM
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Re: Nissan GT-R's on Dynos
Quote:
JoeRockhead said:Quote:
AUM said:
It will be interesting to see the actual crank hp of the GTR when it is eventually accurately measured. Until then it is a guessing game as no-one knows the exact drivetrain loss on the GTR. Nissan have said it is only 10%. Others say 20%. My guess is about 15%.
The GTR may well have a bit more than 480HP but this is not the main factor in its stellar track performance. This is mainly due to the way it gets the power onto the tarmac.
Telling everyone that the drive line only reduces power by 10% is a great way to say you've only got 480HP when in fact you have 520.
420 whp plus 10% = 462 hp. 420 whp plus about 15% = 480 hp.
The problem is that even the wheel hp measurements are not truly accurate. To really know engine HP you have to measure it at the crank with the engine out of the car.
Aug 21, 2008 8:18:19 PM
- Dock (Atlanta)
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Re: Nissan GT-R's on Dynos
Quote:
AUM said:
''This car performed nearly identically to the fourth car. It smoked the quarter-mile in 11.6 seconds at 120 mph and produced 420 wheel horsepower. We also measured the turbo boost pressure in both cars, and the curves were basically identical.''
420 whp plus 15% drivetrain loss = 480 hp at the crank
420 whp at a 15% drivetrain loss = 491.117 hp at the crank.
Aug 21, 2008 8:55:45 PM
- fritz
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Re: Nissan GT-R's on Dynos
Quote:
Dock (Atlanta) said:Quote:
AUM said:
''This car performed nearly identically to the fourth car. It smoked the quarter-mile in 11.6 seconds at 120 mph and produced 420 wheel horsepower. We also measured the turbo boost pressure in both cars, and the curves were basically identical.''
420 whp plus 15% drivetrain loss = 480 hp at the crank
420 whp at a 15% drivetrain loss = 491.117 hp at the crank.
Not that it's gonna change the future course of world history, but 420 whp at 15% drivetrain loss equates to 494.118 hp at the flywheel.
Re: Nissan GT-R's on Dynos
Quote:
fritz said:Quote:
Dock (Atlanta) said:Quote:
AUM said:
''This car performed nearly identically to the fourth car. It smoked the quarter-mile in 11.6 seconds at 120 mph and produced 420 wheel horsepower. We also measured the turbo boost pressure in both cars, and the curves were basically identical.''
420 whp plus 15% drivetrain loss = 480 hp at the crank
420 whp at a 15% drivetrain loss = 491.117 hp at the crank.
Not that it's gonna change the future course of world history, but 420 whp at 15% drivetrain loss equates to 494.118 hp at the flywheel.
Actually, it's 494.1176470 (420/0.85), but who's counting?
And if the GT-R's drivetrain losses ARE 20% on the dyno, then it's 525.
Aug 22, 2008 4:30:35 AM
- Dock (Atlanta)
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Re: Nissan GT-R's on Dynos
Quote:
fritz said:Quote:
Dock (Atlanta) said:Quote:
AUM said:
''This car performed nearly identically to the fourth car. It smoked the quarter-mile in 11.6 seconds at 120 mph and produced 420 wheel horsepower. We also measured the turbo boost pressure in both cars, and the curves were basically identical.''
420 whp plus 15% drivetrain loss = 480 hp at the crank
420 whp at a 15% drivetrain loss = 491.117 hp at the crank.
Not that it's gonna change the future course of world history, but 420 whp at 15% drivetrain loss equates to 494.118 hp at the flywheel.
You are correct...my "typo" of a "1" instead of a "4".
Re: Nissan GT-R's on Dynos
Quote:
janus said:
So what does the Turbo produce on wheels?
429 whp according to this http://www.turbo911.com/showthread.php?t=336
We strapped the car to the dyno and ran our base lines. The 997TT is an interesting beast to dyno as all of the new cars are. They switch maps almost 8 times before the car will settle into a good base. On any turbo this can and does become an issue with cooling. So for almost all of our TT testing we remove the bumper to force air back through the intercoolers while also using fans in the engine bay and front nose.
The first set of baselines yielded 429HP and 440TQ. This is in AWD mode. All of our testing is done in house on our dyno, a Mustang 500SE AWD unit. The test was done in overboost mode. The max back pressure measured before cat after the turbine housing 6.5Lbs
Re: Nissan GT-R's on Dynos
Quote:
AUM said:
Crank hp is difficult to measure, but the whp of the Turbo and GTR seem close. The GTR advantage is not HP but traction, stability and the ability to carry more speed through corners.
The fact about the GT-R having better cornering performance is not in question. People are doubting reports about it being faster in a straight line than the 997TT, which is clearly not the case IRL.
Re: Nissan GT-R's on Dynos
Quote:
Crash said:Quote:
AUM said:
Crank hp is difficult to measure, but the whp of the Turbo and GTR seem close. The GTR advantage is not HP but traction, stability and the ability to carry more speed through corners.
The fact about the GT-R having better cornering performance is not in question. People are doubting reports about it being faster in a straight line than the 997TT, which is clearly not the case IRL.
Most tests have the TT and GTR very close to 200 km/h when the turbo starts to pull away slowly. I have never heard claims that the GTR is faster than a TT from 0-300 km/h.
Given the similar straight line performance I am quite amazed that the GTR is faster on all tracks tests than the TT. How could Nissan out corner Porsche?
Re: Nissan GT-R's on Dynos
Quote:
AUM said:Quote:
Crash said:Quote:
AUM said:
Crank hp is difficult to measure, but the whp of the Turbo and GTR seem close. The GTR advantage is not HP but traction, stability and the ability to carry more speed through corners.
The fact about the GT-R having better cornering performance is not in question. People are doubting reports about it being faster in a straight line than the 997TT, which is clearly not the case IRL.
Most tests have the TT and GTR very close to 200 km/h when the turbo starts to pull away slowly. I have never heard claims that the GTR is faster than a TT from 0-300 km/h.
Given the similar straight line performance I am quite amazed that the GTR is faster on all tracks tests than the TT. How could Nissan out corner Porsche?
Much better AWD. It's no secret really, as RC (a former rally driver) complained about the PTM setup when he received his car, even before any tests that showed the Turbo being somewhat slow on the track relative to its competitors.
Re: Nissan GT-R's on Dynos
Quote:
AUM said:Quote:
Crash said:Quote:
AUM said:
Crank hp is difficult to measure, but the whp of the Turbo and GTR seem close. The GTR advantage is not HP but traction, stability and the ability to carry more speed through corners.
The fact about the GT-R having better cornering performance is not in question. People are doubting reports about it being faster in a straight line than the 997TT, which is clearly not the case IRL.
Most tests have the TT and GTR very close to 200 km/h when the turbo starts to pull away slowly. I have never heard claims that the GTR is faster than a TT from 0-300 km/h.
Given the similar straight line performance I am quite amazed that the GTR is faster on all tracks tests than the TT. How could Nissan out corner Porsche?
By the time the GTR will be sold to customers (2ndhalf 2009) the 997TT FL will have fixed the problem
Re: Nissan GT-R's on Dynos
Quote:
trip said:
Perhaps. I would be very impressed if the FL 997tt is faster than the GTR on most tracks.
+1. And surprised.
Porsche has a dilemma. It cannot make the Turbo almost as fast on the Ring as the GT2 (and faster than the GT3RS) without upsetting its marketing strategy.
It will be interesting to see if the Turbo FL goes GTR hunting or stays in its place in the 911 hierarchy.
Re: Nissan GT-R's on Dynos
Quote:
AUM said:
But there is not much room between the GT2 and GTR. To beat the GTR on the Ring the FL Turbo would have to get too close to the GT2 - hence Porsche's dilemma.
I expect the FL Turbo to have at least +30-40HP, that is up to 510-520HP, plus PDK and more sorted PTM.
We shall be splitting hairs in the GT-R comparison then.
However, the GT-R will still have the value for money advantage.
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