Nissan GT-R Forum banner
1 - 19 of 19 Posts

·
Banned
Joined
·
1,199 Posts
Discussion Starter · #1 ·
I finally got around to loading the new Cobb AP Alpha firmware along with the LC4 "VDC OFF" file that Joe @ Cobb and Ben @ GTC hooked me up with. I'm pretty impressed. As others have pointed out, the car definitely launches much smoother with less drama. There's a touch of wheelspin out the gate and then that's it, it just pulls like a freight train through the gears. With the old LC2 logic, if I launched too high, it would blow the tires away in 1st gear and then short shift 2nd creating a huge bog. If I launched too low, there would be a touch of wheelspin and then there would again be a huge bog.

I'm thinking the way the car launches now it's pulling consistent low-mid 1.5 60fts on the street which I can live with. It should be interesting to see how it does at the strip. According to the video, even though it holds 4500 RPMs, it seems to actually be launching at 3300 RPMs. I'm wondering if this may be too low for the strip where it's much stickier than on the street. Guess I'll have to find out soon. But for the street, this seems like the hot ticket!


If the Youtube video doesn't look smooth on your machine, try downloading the raw AVI from here:

http://titsup-racing...LC4_VDC_Off.avi
 

·
Registered
Joined
·
2,453 Posts
Looks good. What's the 0-60mph time? What other changes have you made to the car besides the tune?
 

·
Banned
Joined
·
1,199 Posts
Discussion Starter · #4 ·
It's a 2009 with Cobb AP NIS-006 & HP Logic E85 Tune, Twin Walbro 255's, ID1000's, Cobb SF 2.75" Intakes, OEM 2012 Suction Pipes, Agency Power Downpipes, Harman Motive non-resonated midpipe and a stock 2009 Catback.

Not sure on the 0-60 MPH. It's running 10.1x in the 1/4 mile though.
 

·
Registered
Joined
·
1,011 Posts
Can you not push the accelerator to the floor and lower the launch rpm if you want to go easier like a 4,000 rpm launch, or is it all or nothing to get launch to work with cobb? I have a 2009 and would love to get LC4 on it once Cobb finalizes the programming.
 

·
R36 Member
Joined
·
6,049 Posts
It's a 2009 with Cobb AP NIS-006 & HP Logic E85 Tune, Twin Walbro 255's, ID1000's, Cobb SF 2.75" Intakes, OEM 2012 Suction Pipes, Agency Power Downpipes, Harman Motive non-resonated midpipe and a stock 2009 Catback.

Not sure on the 0-60 MPH. It's running 10.1x in the 1/4 mile though.
I just calculated the 0-60 by counting the frames in the video and it's a 2.87s 0-60 at the most, according to the speedo.
 

·
Banned
Joined
·
1,199 Posts
Discussion Starter · #7 ·
Seems to be all or nothing with the LC4 map I'm running. As soon as it detects gas and brake at the same time it holds 4500 RPMs.

Can you not push the accelerator to the floor and lower the launch rpm if you want to go easier like a 4,000 rpm launch, or is it all or nothing to get launch to work with cobb? I have a 2009 and would love to get LC4 on it once Cobb finalizes the programming.
 

·
Banned
Joined
·
1,199 Posts
Discussion Starter · #10 ·
I'm gonna try it again tonight in manual mode on a road that's Google Earth verified to be flat. I'll try to video the speedo dead on straight so parallax error can't be a variable either. :)

analog because the digital doesn't refresh quickly enough. I suppose i could run a regression calculation, but it'd take more than a few seconds haha.
 

·
R36 Member
Joined
·
6,049 Posts
I'm gonna try it again tonight in manual mode on a road that's Google Earth verified to be flat. I'll try to video the speedo dead on straight so parallax error can't be a variable either. :)
the most difficult part is when the vibration sets in. if you can just zoom so that the whole video is just the analog dial, that might be the easiest to read.
 

·
Registered
Joined
·
2,942 Posts
The launch control looks fantastic! I don't think its actually launching at 3300 - it just dips as it begins to hook up.

Very solid. Congrats!
 

·
Registered
Joined
·
520 Posts

·
Registered
Joined
·
809 Posts
In a 2010 GT-R, do you have to turn the VDC OFF in order to use the LC4 Cobb map? Or can you use the LC4 with VDC ON and maintain some semblance of a warranty?
 

·
Registered
Joined
·
8,155 Posts
That is pretty close. I got 2.7 s on my on vbox with 1 foot rollout or 2.99 without. Your estimate is based on no rollout, so it is like 2.58s with 1 foot roll out like how most magazine tests.

I just calculated the 0-60 by counting the frames in the video and it's a 2.87s 0-60 at the most, according to the speedo.
 

·
R36 Member
Joined
·
6,049 Posts
That is pretty close. I got 2.7 s on my on vbox with 1 foot rollout or 2.99 without. Your estimate is based on no rollout, so it is like 2.58s with 1 foot roll out like how most magazine tests.
yep 2.78 conservative underestimate
. Godzilla needs no massaged numbers.
 
1 - 19 of 19 Posts
Top