new gt-r puts down 482 whp stock

[97talon]

Originally Posted by Double

i have a hard time believing that they are putting more HP to the pavement than they advertise at the Crank.

Nissan rated the gt-r at 480 bhp. So 475 whp is not higher. Nissan very well could have under rated. Some companies have been know to do that.

[mehrshad]

Originally Posted by Double

with 20% loss and 489 at the crank, you would still have almost 400 at the wheels. So Nissan is either giving away 80-100 free HP or they have created the only drive system that increases HP.

even 400 is too low for 11.6 and 120. 400 whp would trap like 115-118mph max, but when i saw some video of gt-r, the tranny is not shifting really fast either. and 20% loos gives you 388 whp.

[BOTLFEDLT1]

Keep in mind that hub based dynos read higher than roller dynos due to the elimination of tire slippage and the fact that you are missing about 250 lbs of rotational weight from wheels and tires (20 inchers that that!) . I can believe that its underrated, but lets be serious here... no manufacturer is going to underrate their car by 120 hp.

[Thirdgen89GTA]

How about this, the dyno is factoring in driveline losses and calculating Flywheel HP based on an average known driveline loss. So the estimated 475hp flywheel hp is based on a chassis dyno reading. The graph wouldn't say FLYWHEEL hp if it was hp at the wheels. Its not so hard though. Even the LS7 only puts down ~465 to the wheels on average and it makes 505hp, which is probably underrated.

400hp cars DO trap near 120mph. The C5 Z06's have trapped 117mph with just 405hp rated at the crank. GM High Tech Performance has an article all about it. I've also seen a heavier 4th gen Camaro with about 420rwhp trap 117mph all day long with poor launches.

The GT-R has the snazzy transmission which offers some pretty fast shift times and that would also help to improve acceleration, giving a slightly higher trap speed.

[mehrshad]

Originally Posted by BOTLFEDLT1

Keep in mind that hub based dynos read higher than roller dynos due to the elimination of tire slippage and the fact that you are missing about 250 lbs of rotational weight from wheels and tires (20 inchers that that!) . I can believe that its underrated, but lets be serious here... no manufacturer is going to underrate their car by 120 hp.

nissan has always under rated the gt-rs . r33 and r34 made 284 awhp bone stock. that's almost 100hp right there.

Originally Posted by Thirdgen89GTA

How about this, the dyno is factoring in driveline losses and calculating Flywheel HP based on an average known driveline loss. So the estimated 475hp flywheel hp is based on a chassis dyno reading. The graph wouldn't say FLYWHEEL hp if it was hp at the wheels. Its not so hard though. Even the LS7 only puts down ~465 to the wheels on average and it makes 505hp, which is probably underrated.

400hp cars DO trap near 120mph. The C5 Z06's have trapped 117mph with just 405hp rated at the crank. GM High Tech Performance has an article all about it. I've also seen a heavier 4th gen Camaro with about 420rwhp trap 117mph all day long with poor launches.

The GT-R has the snazzy transmission which offers some pretty fast shift times and that would also help to improve acceleration, giving a slightly higher trap speed.

yea, but which one weight 4k lbs?we are talking about 388 whp if that car makes 480 bhp. that tranny dose not shift fast either like ferrari's tranny do. hell i can shift faster than that.

[Thirdgen89GTA]

If its 475whp then its not fast enough at 120mph. If a 350whp C5 Z06 can match its trap speed then somethings not right.

475hp is about right. Certainly I believe the engine could have been under rated. GM's done it with every V8 born in the corvette that found its way into the F-body. Factory freak LS1's have put down near 300rwhp when they only made 315hp at the crank. If you go with that then you get about 360hp. The LS1 in the Corvette was rated at 350hp, which would explain why the LS1 F-bodies put down some impressive numbers. Internally the heads/cam of the engine are identical between the Vette and F-body LS1's. Only differences remain are the filter/intake charge piping, and exhaust. LS1 Vettes didn't put down such impressive numbers, they put down numbers that were right in the ballpark using expected drivetrain losses.

IF thats true then its sad, because the C6 Z06's make 505hp and trap near 127mph (ranger's and his C6 Z06 come to mind) with about 460whp. Yes the GT-R is AWD, so its parasitic losses are greater.

[97talon]

Originally Posted by BOTLFEDLT1

Keep in mind that hub based dynos read higher than roller dynos due to the elimination of tire slippage and the fact that you are missing about 250 lbs of rotational weight from wheels and tires (20 inchers that that!) . I can believe that its underrated, but lets be serious here... no manufacturer is going to underrate their car by 120 hp.

I read several articles about the comparison between the dynopack dynos and others like dyno jet and just like anything else it depends on whose dyno you go to. I have read about them reading lower than a dyno jet and then the same car going to another one and having it read higher than a dyno jet.

[mehrshad]

Originally Posted by Thirdgen89GTA

If its 475whp then its not fast enough at 120mph. If a 350whp C5 Z06 can match its trap speed then somethings not right.

475hp is about right. Certainly I believe the engine could have been under rated. GM's done it with every V8 born in the corvette that found its way into the F-body. Factory freak LS1's have put down near 300rwhp when they only made 315hp at the crank. If you go with that then you get about 360hp. The LS1 in the Corvette was rated at 350hp, which would explain why the LS1 F-bodies put down some impressive numbers. Internally the heads/cam of the engine are identical between the Vette and F-body LS1's. Only differences remain are the filter/intake charge piping, and exhaust. LS1 Vettes didn't put down such impressive numbers, they put down numbers that were right in the ballpark using expected drivetrain losses.

IF thats true then its sad, because the C6 Z06's make 505hp and trap near 127mph (ranger's and his C6 Z06 come to mind) with about 460whp. Yes the GT-R is AWD, so its parasitic losses are greater.

you are right there is something is wrong and that's because gtr is 600-700lbs heavier. whp dosn't do all the trapping. even the 08 viper with 550whp and 3400 lbs traped 130 mph. and i highly doubt c5 z06 trapes 120. they trap like 115-118 mph.

[JGT8229]

or that skyline has upped the psi mabey???

[BOTLFEDLT1]

Thats a possibility. Car and driver got 13.1's out of "preproduction" versions of the MKIV supra's when they were first released back in 1993. It was later found that they were running a bit more boost than regular production models.

Originally Posted by rydinturbo

or that skyline has upped the psi mabey???

[Double]

Originally Posted by BOTLFEDLT1

Keep in mind that hub based dynos read higher than roller dynos due to the elimination of tire slippage and the fact that you are missing about 250 lbs of rotational weight from wheels and tires (20 inchers that that!) . I can believe that its underrated, but lets be serious here... no manufacturer is going to underrate their car by 120 hp.

exactly! manufacturers underate cars for a variety of reasons, mostly because quality control can't be so precise to mass manufacture engines and have them spit out an exact HP. In order to ensure that they aren't falsely advertising (except for ford) most underate their engines. Now that said nobody mass produces engines that are underated 120 Hp and doesn't take credit for it. IMO this car has either been tuned, or the Chart is talking about HP at the crank. It does say on the dyno sheet "at the Flywheel". So you guys are taking the evidence dismissing part of it and assuming that Nissan has now become a charity and not a business. I like the car too, I just don't buy that its a 600Hp car stock!

[BOTLFEDLT1]

On the topic of over enthusiastic numbers, I came across this post on the Nissan/Infinity Owners forum that gave me a good laugh.... I know its a quick car, but there are some ppl out there that actually believe it will run 149 mph (i.e. busa level) in the quarter b/c that is what motortrend said (obvious misprint that was later retracted). For any other car, ppl would dismiss it immediately as a typo, but for the gt-r... its somehow within the realm of possibility LOL.

"I should have said there are 4 current production cars faster then the GT-R around Nurburgring.

But at 0-60 in 3.5 seconds and 11.7 at 149 mph in the 1/4 mile I'm not sure how many cars are faster. List off the cars that you know of faster to 60 or faster in the 1/4 mile. Now how many are under $100,000?

Even the most potent version of your Viper the 2008 SRT10 ACR which is barely street legal by the way does 0-60 in 3.7 seconds. It ties the 1/4 mile at 11.7 but its only going 124 mph.

The 2003 Ferrari Enzo was faster although not currently in production it did 0-60 in 3.4 seconds and 1/4 mile in 11.3 seconds at 123 mph. The 2004 porsche GT did 0-60 in 3.7 seconds and the 1/4 mile at 11.1 at 130 mph. I know these are not production cars but they are some of the fastest cars ever made so if the GT-r is in between them to 60 you can understand our excitement. "

More stupidity found here: Corvette Killer is here!!! Nissan GTR!!!!! 1/4 mile - 11.7 sec. at 149 mph

[01mmmz28]

^ lamo...those ricers actually beleive that it hit 149mph in the 1/4 mile.....typo owns them all. And the ZR1 will OWN that Nissan, no doubt about it, hell the current Zo6 OWNS it already in the 1/4 mile.....so WTF are they smoking??

[Marek]

Originally Posted by Memphis

Very nice I wonder how much different the US version will be from the Japanese & Euro versons

The one we will get is going to be a joke, specially as the North American Market is always aiming luxury and useless crap.

from what ive read we are supposed to get a 370hp model or something in that range...

[R1KID]

Originally Posted by 01mmmz28

^ lamo...those ricers actually beleive that it hit 149mph in the 1/4 mile.

No shit, all these f*cking ricers do is magazine race, anyone who has set foot on a track would know what it takes to run 149MPH, the funny thing is that the GTR has not even hit the streets yet and the rice is already cooking, all these f*cking ricers posting ambiguous dyno graphs, talking shit about what it's "gonna" do and who it's "gonna" beat, shit, the only thing it's gonna beat is beat off.