2012 Nissan GT-R Gets Official 2.9 Second 0-60 MPH Time - Page 2 - 6MT.net Infiniti G35/G37/GTR Forums
User Tag List

Reply
 
LinkBack Thread Tools
post #16 of 29 Old 01-17-2011, 10:57 PM
Administrator
Lifetime Supporting Member
 
Infiniti514's Avatar
 
Join Date: Jul 2005
Location: Philly
Posts: 105,691
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 377 Post(s)
Default

Quote:
Originally Posted by GZire View Post
The GT-R is 3,800/480hp = 7.92 lbs/hp. The ZR-1 is low 3,300/638hp = 5.24 lbs/hp.

Are you telling me the GT-R has in excess of 726 hp?.........because 725 hp means the GT-R would have the same lbs/hp rating as the ZR-1.
we all know that lbs/hp is just one factor. gearing is another one.

KING PW
Infiniti514 is offline  
Sponsored Links
Advertisement
 
post #17 of 29 Old 01-18-2011, 08:52 AM
Over 250 Posts
 
X-FactorWR87's Avatar
 
Join Date: Jan 2011
Location: Ohio
Posts: 430
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Default

Quote:
Originally Posted by thatguy View Post
hahaha!


+1

..::X-FACTOR WR 87::.. (2005 Infiniti G35 coupe sport, 2000 Ford F-150 XLT Extended Cab)

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
X-FactorWR87 is offline  
post #18 of 29 Old 01-18-2011, 11:34 AM
Moderator
Lifetime Supporting Member
 
GZire's Avatar
 
Join Date: Jun 2004
Location: Hawaii
Posts: 35,666
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Default

Quote:
Originally Posted by Infiniti514 View Post
we all know that lbs/hp is just one factor. gearing is another one.
So you're saying the GT-R's gearing makes up for the disparity in lbs/hp ratio?






Now I'm just laid bad - G35Princess
R.I.P. MBC

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
GZire is offline  
 
post #19 of 29 Old 01-18-2011, 12:54 PM
Administrator
Lifetime Supporting Member
 
Infiniti514's Avatar
 
Join Date: Jul 2005
Location: Philly
Posts: 105,691
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 377 Post(s)
Default

Quote:
Originally Posted by GZire View Post
So you're saying the GT-R's gearing makes up for the disparity in lbs/hp ratio?

sure. its geared to be quick off the line but not for high top speeds.

KING PW
Infiniti514 is offline  
post #20 of 29 Old 01-18-2011, 11:16 PM
Moderator
Lifetime Supporting Member
 
GZire's Avatar
 
Join Date: Jun 2004
Location: Hawaii
Posts: 35,666
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Default

^^^Hence why is it not slower than the ZR-1 on that last long straight stretch on the Nord? ZR-1 is lighter, more powerful, and geared better...........yet the GT-R is faster...........buckets of awesomeness my friend, that's what the lizard has........




Now I'm just laid bad - G35Princess
R.I.P. MBC

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
GZire is offline  
post #21 of 29 Old 01-18-2011, 11:24 PM
Super Duper Moderator
Lifetime Supporting Member
 
Gilley's Avatar
 
Join Date: Apr 2005
Location: Orlando, Florida
Posts: 53,488
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 1167 Post(s)
Default

I'm not going to be driving a GT-R, a ZR1, or anything on the Nord. It's all over my head.

'06 Autumn Copper FX35, '11 Alpine White Sentra & 2016 Red Hot Camaro 2SS
Gilley is offline  
post #22 of 29 Old 01-18-2011, 11:43 PM
Moderator
Lifetime Supporting Member
 
GZire's Avatar
 
Join Date: Jun 2004
Location: Hawaii
Posts: 35,666
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Default

^^^I'd love to try but that stretch is so long you get up to some really high speeds............I don't think I'd have the stones the bury the gas pedal for as long as I should.




Now I'm just laid bad - G35Princess
R.I.P. MBC

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
GZire is offline  
post #23 of 29 Old 01-19-2011, 05:38 AM
Administrator
Lifetime Supporting Member
 
Infiniti514's Avatar
 
Join Date: Jul 2005
Location: Philly
Posts: 105,691
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 377 Post(s)
Default

Quote:
Originally Posted by GZire View Post
^^^Hence why is it not slower than the ZR-1 on that last long straight stretch on the Nord? ZR-1 is lighter, more powerful, and geared better...........yet the GT-R is faster...........buckets of awesomeness my friend, that's what the lizard has........
Like I said, it's faster because it has more power than advertised! And maybe comes into that stretch at a higher speed.

KING PW
Infiniti514 is offline  
post #24 of 29 Old 01-19-2011, 07:11 AM
Over 10,000 Posts
 
Neftali's Avatar
 
Join Date: Aug 2005
Location: Yamaguchi, JP
Posts: 18,809
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Default

Quote:
Originally Posted by Infiniti514 View Post
Like I said, it's faster because it has more power than advertised! And maybe comes into that stretch at a higher speed.
How much HP do you think the GT-R actually has??


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Neftali is offline  
post #25 of 29 Old 01-19-2011, 11:06 AM
Moderator
Lifetime Supporting Member
 
GZire's Avatar
 
Join Date: Jun 2004
Location: Hawaii
Posts: 35,666
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Default

^^^He cannot say. I already stated fact about the ZR-1's hp/weight ratio. He hasn't come up with a good reason why the GT-R would seemingly need well over 700 hp to match the Vette yet alone beat it.

Same story that's been going around for 2 years.




Now I'm just laid bad - G35Princess
R.I.P. MBC

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
GZire is offline  
post #26 of 29 Old 01-19-2011, 01:27 PM
Administrator
Lifetime Supporting Member
 
Infiniti514's Avatar
 
Join Date: Jul 2005
Location: Philly
Posts: 105,691
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 377 Post(s)
Default

What is the GT-R?s Real Horsepower? - Column - Auto Reviews - Car and Driver

2009 Nissan GT-R - Dyno Test - Results and Analysis - Motor Trend

according to the one article, no way is the GT-R only experiencing a 10% drivetrain loss.

KING PW
Infiniti514 is offline  
post #27 of 29 Old 01-19-2011, 10:54 PM
Moderator
Lifetime Supporting Member
 
GZire's Avatar
 
Join Date: Jun 2004
Location: Hawaii
Posts: 35,666
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Default

Quote:
Originally Posted by Infiniti514 View Post

Quote:
............How much power is lost in the journey to the road is not accurately known, but a 15-percent loss for rear-drive cars with manual transmissions and a near 20-percent loss for four-wheel-drive cars are good estimates.

On MotorCity Speed’s Mustang dyno in Commerce Township, Michigan, GT-R No. 4 produced a peak of 415 horsepower at the wheels. Based on our 20-percent loss estimate, the engine output was 519, or 39 horsepower more than Nissan’s stated 480.
C&D uses an assumed drivetrain loss. Again the GT-R is the first of it's kind running a rear double clutch transmission. Looking at every dyno in the world you don't see a drop in torque when running the car. This means no dump on the blowoff which means no loss of boost. This is one of the reasons why the GT-R performs so well.

The ZR-1 has the advantage through 60 with respect that it can run the entire time in 1st gear. The trouble with cars like the ZR-1 and Viper is they have a hard time getting all of that torque/power to the road without vaporizing their tires.




Now I'm just laid bad - G35Princess
R.I.P. MBC

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
GZire is offline  
post #28 of 29 Old 01-19-2011, 11:01 PM
Moderator
Lifetime Supporting Member
 
GZire's Avatar
 
Join Date: Jun 2004
Location: Hawaii
Posts: 35,666
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Default

Quote:
So what's the crank horsepower?

Well, if it's 480 as claimed, the power lost to heat and friction in the drivetrain amounts to just 10.3 percent. "No way," says K&N's James Yim, who reckons the bare minimum lost to all the friction and gears in this rear-transaxle all-wheel-drive twin-clutch manual (a radiator about the size of an intercooler is dedicated to cooling the transaxle) is 15 percent. He'd bet it's more like 20 or 25 percent -- especially considering that during such a dyno pull, the ATESSA ET-S AWD system has to route nearly 50 percent of the torque to the front axle to spin that huge front roller on its own (which it won't do during a dry-road acceleration run). Consider too that, although these figures are all weather corrected to SAE standard conditions, the conversion doesn't take into account the loss of intercooler efficiency in 93-degree weather. Given those three drivetrain-loss guesstimates, here's how the crank output looks:
I would liked to have seen what the torque split was for the dyno runs. It's easy enough to find out if the dyno operator just ran some video on the interior of the car.

I will tell you for a fact that yes when getting off the line there is most definitely a near 50/50 split from the front to rear wheels. This split also diminshes very quickly. People would be surprised how little of the time the GT-R spends with a 50/50 or large torque split to the front axle.

I will again repeat that there are dynos that can measure the angular rotation of the drums and using their rotational inertia, along with the rotational intertia of the wheels, measure the actual parasitic loss for the powertrain components. This measurement backed up Nissan's claims.

A lot of people did not and still do not believe that result.

The one way to settle this (and what none of the speculators wants to do) is pull the engine and stick the VR38DETT on an engine dyno this will tell you what the engine is putting out versus what's getting to the wheels.



..........again the drive train losses are estimated not fact.




Now I'm just laid bad - G35Princess
R.I.P. MBC

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
GZire is offline  
post #29 of 29 Old 01-19-2011, 11:18 PM
Moderator
Lifetime Supporting Member
 
GZire's Avatar
 
Join Date: Jun 2004
Location: Hawaii
Posts: 35,666
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Default

OK...........I realize a serious flaw in my thinking. 14% will not believe me. I will look at this a different way.

Since 14% loves the quoted drivetrain losses, let's look at the standard 15% that people use for the rear drive ZR-1.

638 hp with a 15% drivetrain loss gives us 542 rwhp.........pretty much in line with what owners have reported for their ZR-1's.

C&D says they dynoed at 415 & 420 whp. MT was 410 to 435 whp.

So the ZR-1 is 3,300lbs/542rwhp = 6.09 lbs/hp
The GT-R is 3,800lbs/432whp (using Nissan's claimed 10% drivetrain loss and 3 hp shy of the highest hp measured by MT) = 8.80 lbs/whp

Funny, why does the power to the wheels favor the car with the Bowtie, yet the GT-R make such a good showing? To match the ZR-1 the GT-R should be making 624 whp at the ZR-1's 6.09 lbs/hp, yet that is not the case and that is off of C&D and MT's measured whp figures.




Now I'm just laid bad - G35Princess
R.I.P. MBC

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
GZire is offline  
Sponsored Links
Advertisement
 
Reply

  6MT.net Infiniti G35/G37/GTR Forums > Infiniti G35/G37 News & Polls > Infiniti G35/G37 News / Site News


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
2012 Nissan GT-R to Debut at La Auto Show - First Official Pics Inside AutoGuide.com Nissan GTR Car and Product News 8 10-31-2010 07:19 PM
2012 Nissan GT-R Rumored to Get as Much as 530-Horsepower AutoGuide.com Infiniti G35/G37 News / Site News 2 09-02-2010 08:45 PM
2012 Nissan GT-R Changes Include RWD Mode AutoGuide.com Infiniti G35/G37 News / Site News 26 08-30-2010 11:16 PM
2012 Nissan GT-R Details, Pictures Leaked AutoGuide.com Infiniti G35/G37 News / Site News 5 08-24-2010 06:13 PM
2012 Nissan GT-R Rumored at Over 500-Horsepower Administrator Infiniti G35/G37 News / Site News 45 06-15-2010 08:41 AM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome