camber Posted April 30, 2008 Posted April 30, 2008 With all the news surrounding the Nissan GT-R V-Spec, the progress on the Godzilla tuning front has been largely overlooked. According to a recent article in Japan's BestCar magazine, the Amuse team has broken the 600 hp mark (at the crank) with a combination of a high-flow exhaust and a tweaked ECU. There were no details on how the GT-R's computer was hacked, but Amuse was able to up the boost to 18 psi, resulting in an increase in output to 602.73 hp and 576.95 lb.-ft. of torque. However, tuners are beginning to question how the stock gearbox will hold up under the strain of additional output. MCR, which brought out its GT-R for filming of Hot Version 93, has been exacting its own brand of punishment on its tuned GT-R and is worried how long the transmission will last. It's not clear if the tranny woes are due to the clutch plates or something else, but it's been all but confirmed that dual-clutch gearboxes have an issue with additional torque since the friction surface is much smaller than on a stock (read: single plate) clutch. MCR's best guesstimate is that the stock 'box might only be able to hold up to the additional power for 12 months before problems begin arise. Now, we're particularly interested in how Nissan is beefing up the tranny on the V-Spec to handle its rumored 600 hp. [sources: GTRBlog, NissanGTRProto] http://www.gtrblog.com/media/blogs/gtrblog/MCRGTR/mcr-update-004.JPGhttp://www.gtrblog.com/media/blogs/gtrblog/MCRGTR/mcr-update-002.JPG http://www.gtrblog.com/media/blogs/gtrblog/MCRGTR/mcr-update-003.JPG Interesting developments... I'm not sure to make of the transmission problems. However, it is something I thought would crop up when tuning engines hooked up to these new dual clutch transmissions. I wait to make up my mind when more people start tuning this car past stock power levels.
John M Posted May 1, 2008 Posted May 1, 2008 Since the 470hp claimed HP has been accused of being underrated, I don't see how eeking 100hp from a twin turbo v6 is any kind of amazing feat. They simply removed Nissan's designed-in "buffer," exchanging power for longterm reliability. It probably didn't even need any ECU tweaking; simple piggybacks are ok for mild modifications. It's been done like that for nearly 20 years. What I want to know is how this has affected the drivability aspect. A fancy transmission like that is calibrated to the stock engine's output. If anything, this is the area that needs hacking first.
IwannaSportSedan Posted May 1, 2008 Posted May 1, 2008 That has more in common with a traditional manual transmission than any hydraulic automatic. Basically replace the H-gate shifter, and clutch slave cylinder (two needed anyway, with a dual-clutch transaxle/transmission... two clutch pedals would be a bit much anyway) I would have figured Nissan/Jatco would have engineered it to handle more power than the engine could put out, and not have it be made of glass in such a powerful car. But with the potential of 500hp and torque at the end of an input shaft, and three output shafts, and a torque biasing system... there is a lot of stuff there. It may not even be a different "family tree" as the Subaru transaxles, obviously much more developed for dual clutches and computer controls, etc.
chenc544 Posted May 1, 2008 Posted May 1, 2008 Nissan just shaved another 9 sec off GT-R's 'Ring time. The mark is now 7:29 for the GT-R with stock JDM tires. About 1 sec behind Carrera GT. Nissan is certainly pulling no punches going after Porsche in their own backyard. http://www.autoblog.com/2008/05/01/gt-r-drops-ring-time-down-to-7-29/
camber Posted May 1, 2008 Author Posted May 1, 2008 PRESS RELEASE GT-R ACHIEVES UNDER 7:30 AT NÜRBURGRING - GT-R among the fastest ever production road cars at the 'Ring' - Nissan today announced that its GT-R supercar achieved a lap time at the infamous Nürburgring in Germany of seven minutes and 29 seconds. Recorded on April 16 and 17, the GT-R used was a base specification car and fitted with the standard Japanese market tyres. Driven by GT-R chief test driver Tochio Suzuki, this latest lap time beats the previous fastest time for the GT-R by nine seconds. The previous best lap time for GT-R of 7:38, also driven by Suzuki, was one of the fastest laps achieved by a production car despite conditions being slightly damp on two corners. "At last year's testing, we were frustrated by the conditions at the Nürburgring, always believing that the GT-R could go under seven minutes 30 seconds," said Kazutoshi Mizuno, Chief Vehicle Engineer for GT-R. "Below seven minutes 30 seconds, the GT-R proves it is among the fastest mass-production cars in the world. We set out to build a multi-performance supercar accessible to anyone, anytime and anywhere – I believe the GT-R has delivered that promise." Deliveries of the all-new GT-R began in Japan in December 2007. Sales in the US and Canada start in July and extend to Europe and other markets over the next 12 months. 7:29s on 'ring:eek: I always new that the GT-R could have gone faster if the track wasn't damp. The V spec could be in the low 7:20 range or break under the 7:20 range. 300 less pounds,120 more horsepower and a new aero package could see its lap times drop through the floor.
chenc544 Posted May 3, 2008 Posted May 3, 2008 ZR1 chief engineer talking smack about the 7:29... This is going to be fun. http://www.autoblog.com/2008/05/02/corvette-zr1-engineer-says-gt-r-wont-be-king-of-the-ring-for-l/
TPLGT Posted May 3, 2008 Posted May 3, 2008 I don't care what the cars can turn at the ring I would still rather have the 911 Turbo...just a Porsche person...always have been always will be... Rehab is for quitters.
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