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VDC off at the track. Who does this?

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16 replies to this topic

#1
colo_evo

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Saw a gtr plow into the wall last night at our local track. Fortunately the driver walked away with no major injuries! The car is badly damaged across the drivers size where it hit. I watched this car make multiple passes prior to the wreck, smoking the tires off at the line each time, so much it'd shift to second gear within 20' or so of the starting line. On the last pass it spun off the line, short shifted second and once the boost came in it started spinning again and spun around hitting the wall. This car has an aftermarket turbo setup, stock block/trans. Factory 20" wheels with r compound tires.

I spoke with the driver and tuner afterwards and found they were running in vdc off. They both looked at me funny when I explained I run in vdc R.

Am I in the minority running in R mode? What does everybody else here do? I'm wondering if the car would have saved itself by running in R mode as opposed to off.

#2
shawnhayes

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Original CBA logic REQUIRED VDC to be off.  The reprogrammed logic for mine works best in R-comfort-off with my DSCSport controller and my Cobb tuning transmission map.

 

So, this is pretty common.

 

Once a high horsepower GT-R has gotten loose at the track, it's hard for VDC to reel it back it.

 

Shawn



#3
shawnhayes

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Clarification: The original CBA LAUNCH CONTROL required VDC off.  R-R-Off was the only setting it'd launch properly.  We got Cobb to let R-C-Off to be acceptable later to let the rear "squat" a little better.

 

Shawn



#4
Dsm_alpha

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On VDC-off though the Cobb traction control will take over if it is setup properly

#5
colo_evo

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I'm not sure what software it was running, didn't ask. The car was a dba though, so traction control doesn't have to be off to launch(at least I think, but again it's setup through the tuner).

Shawn, I'm not sure the traction control would have saved it once it was out of control, but I'd think tcs in r wouldn't let the car get sideways in the first place?

When I ran mine on the road course, I tried to push against the traction limit and was able to activate traction control multiple times and never felt out of control once.

But so far, it looks like I'm in the minority running vdc in r mode...

#6
Tim

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Donโ€™t leave the house without her being R-C-Off
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#7
elf_cruiser

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Donโ€™t leave the house without her being R-C-Off


Correction, R-R-Off
๐Ÿ˜‚๐ŸŽ๐Ÿ’จ
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#8
colo_evo

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On VDC-off though the Cobb traction control will take over if it is setup properly



So it's not truly off then. Very interesting.

#9
Dan_585

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Were you the FBO E85 GTR owner talking to someone with a red 600whp civic? Lol

#10
colo_evo

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Were you the FBO E85 GTR owner talking to someone with a red 600whp civic? Lol


No, I know that guy though. I believe he went 10.8X @128 or so. He's got a midnight opal.
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#11
droptopp

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So it's not truly off then. Very interesting.


Only if you have Cobb advanced traction turned on. ;)
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#12
shawnhayes

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When I ran mine on the road course, I tried to push against the traction limit and was able to activate traction control multiple times and never felt out of control once.

But so far, it looks like I'm in the minority running vdc in r mode...

 

The really high horsepower GT-R's can still get sideways from a hard hard launch.

 

And as far as being at the drag track, yes, you are likely one of the few that run R-R-R launch.

 

The road course is very very different than the drags.  Gettting a GT-R out of shape most certainly can be done, but as far as spins and backward on the road course, it is awfully hard to get backwards there.  Drag is another issue.  The way they get out of shape is from total loss of rear traction.  Applying the rear brakes (how our VDC works) once a 1000hp launch has hit, isn't always able to recover.

 

Shawn



#13
ian.r

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No, I know that guy though. I believe he went 10.8X @128 or so. He's got a midnight opal.

he crashed a midnight opal? Those are rare, that sucks

#14
colo_evo

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The really high horsepower GT-R's can still get sideways from a hard hard launch.

And as far as being at the drag track, yes, you are likely one of the few that run R-R-R launch.

The road course is very very different than the drags. Gettting a GT-R out of shape most certainly can be done, but as far as spins and backward on the road course, it is awfully hard to get backwards there. Drag is another issue. The way they get out of shape is from total loss of rear traction. Applying the rear brakes (how our VDC works) once a 1000hp launch has hit, isn't always able to recover.

Shawn


This wasn't a fast gtr that wrecked, It was only trapping high 120's.

#15
colo_evo

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he crashed a midnight opal? Those are rare, that sucks


No, a black one. The opal did not wreck.
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#16
Dan_585

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Oh haha I thought it was you for a second.

#17
Zilla

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I always run on the track with factory ecu trac off and the cobb trac in the off position but that is on slicks. I would never run full trac off at my HP level if I ran Drag radials on the track. I despise anything but slicks on the track since its wheel hop heaven on our car. Sheared off a DSS pro rear axel a couple of weeks ago when i was hanging out for a street night and decided to do a couple passes at waste gate and Low BOTL using my street drag radials setup.

So it's not truly off then. Very interesting.






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