đź“° Auto News Nissan instructs dealers to reprogram GT-R launch control

Mook

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Nissan North America’s campaign to update willing GT-R owner’s ECUs with the new 2010 firmware has already begun with one enthusiast, Matt “MC” from the North American GT-R Owners Club (NAGTROC), already taking them up on the offer. In the name of science he’s volunteered to have his GT-R go under the knife (so to speak) for the update and report back on the changes.

Matt’s report on the changes has demystified the workings in terms of the much rumoured launch control functions. First up the launch control is not gone, but it is modified. It is no longer a launch from 4,500rpm and it no longer requires the VDC (Vehicle Dynamic Control) to be disengaged to function. That’s right the new launch control functions with VDC ON. It even functions with the gearbox in automatic mode.

So how does it work, you hold the brake on and floor the accelerator. The car revs to 3,000rpm and holds it there. Release the brake and off you go.

Matt has already tested this with a passenger in the car in manual mode and it’s good for 3.8’s 0-60mph times. Without a passenger, in auto mode or on a better surface perhaps it’s good for 3.7 seconds or faster. More testing is required.

The prime issue Nissan seemed to have with the launch control in the 2009 GT-R was the fact that to do it VDC had to be turned off, something the owners manual forbade. Now the launch is much more gentle but the effect is reported to be 80% as potent.

So if guys were hitting 11.6 second quarter mile ETs without launch control before the change, it will be interesting to see what they hit with this revised VDC ON version of the launch control.

http://www.youtube.com/watch?v=9hFzMknBakU&eurl=http://www.gtrblog.com/&feature=player_embedded

[Source: GTRBlog.com]
 

Mook

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and more good news

Owners of Nissan GT-Rs with updated launch control are starting to file their first impressions. So far, they're almost universally positive.

After the whole warranty-voiding Nissan GT-R launch control scandal, Nissan issued a software update purported to correct the problem. It affects launch control in two ways: by increasing the maximum RPM at launch with VDC on from 2,000 to 3,000 RPM and by decreasing the RPM at launch with VDC off from 4,500 to between 3,000 and 3,500 RPM.

The owner of this red GT-R, who we're sadly assuming isn't the hot chick, but the hot chick's less hot boyfriend, is reporting a 1/4 mile time of 11.347 at 120.85 MPH. That's on stock Dunlops, a stock car, stock fuel and the ECU update. He also reported that the conditions were extremely cold, which is good for power, but bad for traction.

That's a little faster than the professional drivers over at Edmunds managed in a non-updated stock GT-R during their official road test. Their Time: 11.6 seconds.

Apparently, the update, instead of slowing the vehicle down, simply leads to less wheel spin and wheel hop off the line, leading not only to smoother launches and less strain on the drivetrain, but also competitive acceleration figures. Sounds good to us, but we'll stick doing it ourselves without computer aid.

[Source: Jalopnik]

and NAGTROC link
http://www.nagtroc.org/forums/index.php?showtopic=28329
 

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Mook

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Bottom line, the GT-R with the revised software will be quicker with the VDC on, but not as quick as it was before with the VDC turned off. Only a trip to the track will reveal exactly how performance will be affected.

This is what we wrote a couple of weeks ago in our investigative piece Nissan Reprograms the GT-R. This reporting was based on interviews with many members of the GT-R team at Nissan's headquarters in Nashville, TN. It was also wrong. Turns out the GT-R gets quicker with the VDC on and off.

How do we know?

Well, we had our long-term GT-R reprogrammed and then we took it to the track. Here are the results:

VDC on

0-30 mph-----1.6 sec.

0-45 mph-----2.5 sec.

0-60 mph-----3.6 sec. (3.4 sec. with one foot of rollout like on a dragstrip)

0-75 mph-----5.1 sec.

1/4 Mile-------11.7 sec. @ 118.5 mph



VDC off

0-30 mph-----1.6 sec.

0-45 mph-----2.5 sec.

0-60 mph-----3.6 sec. (3.3 sec. with one foot of rollout like on a dragstrip)

0-75 mph-----5.0 sec.

1/4 Mile-------11.6 sec. @ 118.9 mph

Test Driver Comments: "Best run with VDC off...but only by a few hundredths. Made a significant effort to warm tires to run w/ vdc off. Result is very little wheelspin. Technique is essentially the same w/vdc on or off: wood brake, wood throttle, achieve 3k rpm and lift brake. All runs in "A" Wheelspin will kill time (bog) w/vdc on."

That means the car is now quicker with the VDC on then it was with it off. We've tested our GT-R several times. The most recent was for a comparison test with the new Corvette ZR1 back in October. That day it ran these numbers with the VDC off:

0-30 mph-----1.6 sec.

0-45 mph-----2.6 sec.

0-60 mph-----3.8 sec. (3.5 sec. with one foot of rollout like on a dragstrip)

0-75 mph-----5.3 sec.

1/4 Mile-------11.8 sec. @ 118.6 mph


We also once tested our car with the VDC on for kicks. It was much slower than it is now:

0-30 mph-----2.3 sec.

0-45 mph-----3.2 sec.

0-60 mph-----4.3 sec. (4.0 sec. with one foot of rollout like on a dragstrip)

0-75 mph-----5.8 sec.

1/4 Mile-------12.3 sec. @ 118.5 mph



And so the answer is clear. If you have a GT-R, get it reprogrammed. It's free speed.

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