Nissan GT-R launch control?

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Maas

Maas

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Hi guys, I was just cruising around the nurburgring and found something wierd. When you stand still and brake very lightly, you just... Well... Brake.
But when you brake harder, the engine's stationary revs go up. It goes from like 950 rpm to 1450 rpm. When the handbrake is on, it doesn't happen. Neither when you brake while the handbrake is on.

Also, when you step on the gas when it's in stationary, with the brakes lightly applied, it stutters.

My first thought was Launch Control, since I believe it's on the real model too, but I don't notice a significant increase of acceleration.

Has anyone got the answer to this?
 
Maas
Hi guys, I was just cruising around the nurburgring and found something wierd. When you stand still and brake very lightly, you just... Well... Brake.
But when you brake harder, the engine's stationary revs go up. It goes from like 950 rpm to 1450 rpm. When the handbrake is on, it doesn't happen. Neither when you brake while the handbrake is on.

Also, when you step on the gas when it's in stationary, with the brakes lightly applied, it stutters.

My first thought was Launch Control, since I believe it's on the real model too, but I don't notice a significant increase of acceleration.

Has anyone got the answer to this?
Click to expand...

It's interesting, certainly. It could just be the quirks of GT's handling of the clutch mixing in a bad way with the terrible low-speed (< ~10 mph) tyre physics. So the clutch and tyres are both slipping, despite the brakes being applied. Weird stuff happens if you turn the wheel, too - at least in FR cars. :dopey:
 
Not too sure about this but I've noticed this on cars which uses in real life DSG gearbox. In GT5 it does that with the GT-R, Lexus IS-F, Bmw M5 , Veyron, and probably few others I just didn't notice. Maybe it's cause by the DSG or other twin-clutch system?
 
No Griffith500, the wheels don't move when the revs go up, I might not have explained that too well. But it's wierd though!
 
Maas
No Griffith500, the wheels don't move when the revs go up, I might not have explained that too well. But it's wierd though!
Click to expand...

You're right, it is weird. Maybe the "brake pressure" information is finding its way into the clutch and is erroneously causing the revs to rise to match the braking force.

I've noticed GT5's clutch does this auto-matching of torque, possibly because it doesn't model the friction properly so it needs help in getting the revs down during gear changes where the clutch "drags" - otherwise the revs would just keep rising. Or whatever :p

Something is definitely up with GT5's clutch model, either way - this looks to be yet another foible. I shall have a play with my "DSG" style cars when I get around to it.
 
It gets wierder. They don't progress as you press the brakes. They shoot from 950 to 1450 instantly when you brake harder.
 
Maas
It gets wierder. They don't progress as you press the brakes. They shoot from 950 to 1450 instantly when you brake harder.
Click to expand...

Yeah, that is totally screwy. :boggled:
Might be interesting to see if it's the same for all "automatic" cars - unless that's exactly what themartlab was referring to?
 
I just thought about it, it's certainly not the launch control. In real life, to use a launch control you must apply max pressure on brake, then max pressure on gas, and you just let the brake, the rev don't go to cut-off like it does in gt5.
 
I guess it's just a default transmission setting for this car. Although it is not a full automatic (doesn't have a torque converter), it has wat is commonly called "creeping". If I'm not wrong, the SL500 has it too, and that has an auto gearbox.
It should happen, in the game, on all cars were auto 'boxes are the only option.
Some cars with automated gearboxes (I don't know the name for sure, but it's when you have a clutch, or two, but don't have the clutch pedal, like in the GT-R) have the "creeping" stuff just to make it feel like an ordinary auto gearbox to the everyday driver.
 
Brunol
I guess it's just a default transmission setting for this car. Although it is not a full automatic (doesn't have a torque converter), it has wat is commonly called "creeping". If I'm not wrong, the SL500 has it too, and that has an auto gearbox.
It should happen, in the game, on all cars were auto 'boxes are the only option.
Some cars with automated gearboxes (I don't know the name for sure, but it's when you have a clutch, or two, but don't have the clutch pedal, like in the GT-R) have the "creeping" stuff just to make it feel like an ordinary auto gearbox to the everyday driver.
Click to expand...

I have a transmission similar to the one in the GTR, and if you put the brake in as the OP describes, the revs do not rise by themselves. I haven't driven the car in question (GTR) but I've driven a number of DSG-equipped cars, and if the revs rise when you're stopped something isn't working properly.

tldr, this is either oddly specific to the GTR or a modeling issue in the game.
 
I think I might have figured it out. Earlier I was playing this online with some people and me and this one other guy were using stock GT-Rs. He told me to use the launch control on the GT-R you have to apply the brake, rev it up to 4000 rpm, let go of the brake while still holding the 4000 rpm and smash the gas. And guess what? It worked! Try it for yourselves. It accelerates much faster.
 
disneyland5
I think I might have figured it out. Earlier I was playing this online with some people and me and this one other guy were using stock GT-Rs. He told me to use the launch control on the GT-R you have to apply the brake, rev it up to 4000 rpm, let go of the brake while still holding the 4000 rpm and smash the gas. And guess what? It worked! Try it for yourselves. It accelerates much faster.
Click to expand...

+1

I carried out a split screen drag race, both stock GTR's and I used the launch control and left the other GTR standing.
 
Maas
Hi guys, I was just cruising around the nurburgring and found something wierd. When you stand still and brake very lightly, you just... Well... Brake.
But when you brake harder, the engine's stationary revs go up. It goes from like 950 rpm to 1450 rpm. When the handbrake is on, it doesn't happen. Neither when you brake while the handbrake is on.

Also, when you step on the gas when it's in stationary, with the brakes lightly applied, it stutters.

My first thought was Launch Control, since I believe it's on the real model too, but I don't notice a significant increase of acceleration.

Has anyone got the answer to this?
Click to expand...

You know if this is real, its a shame that all the starts are rolling now, because in a race where you are stationary at the start, LC would be really awesome.

Of course, you'd need to put it into all of the other cars, E46 M3, 430 and 458 come to mind... which might make it too hard / not really LC.
 
N155AN
+1

I carried out a split screen drag race, both stock GTR's and I used the launch control and left the other GTR standing.
Click to expand...

That don't look like LC at all it is just proper way of starting ... ??

As i know in GTR it's breaking , then gas with brake on, when it gets to 4000 it will stay there and then you loose brake ...

right ? :dunce:
 
Some people said that the gearbox in the new 2012 GT-R was bad or slow and i found the real gearbox ratios of the new GT-R in the Nissan web page of course (PDF) and i found that they put the real ratios with some numbers wrong but doesn´t affect too much at all as you can see here:

Real life gearbox: In the game:
1- 4.056 1- 4.056
2- 2.031 2- 2.301
3- 1.595 3- 1.595
4- 1.248 4- 1.248
5- 1.001 5- 1.000
6- 0,796 6- 0,796
Reverse- 3.383 Final- 3.700

We all know that this car goes 0 to 100km/h in about 2.8 seconds and in this video we can see how fast it is.

http://www.youtube.com/watch?v=PtrUSa7DexU

And then i went to the game and see what happens and the result was quite similar to the real life car and 0 to 100km/h was about 2.8s!!! (all stock tyres included)
(try in top gear as in this video in the same place, push the gas until 5000 rpm and then release the brake of course, imitate the same as in the video and then tell me if it is different, and see if the car make 0 to 100km/h in 2.8 seconds as in real life should be)

I think they made a great job not only with physics i mean with calculations in a virtual game because we all know that not all gearbox ratios, or as i see the virtual torque + power that makes the car move in the game in tons of them are not correct but with some cars they made it pretty accurate.

My cousin had a BMW320i and he is a mechanic and knows in a technical way how a car works from inside and we talked about the gearbox problem/revs in the game and made some changes in the BMW gearbox and we finally make it run as the real car in real life. (despite is the 320i is not in the game because BMW uses more or less the same ratios for their gearboxes, and i am talking about manual transmitions not semi-automatic here)

Again i must say that the "launch control" in the GT-R from the game works as it should be but it feels that it is not in the car because you can´t activate as you can in real life. But the car responds as you have it activated.
 
^ I think by saying the gearbox is too slow, they mean the shifting itself (time between the gears to be clear) takes too long compared to the actual GT-R. Though it's pretty impressive since the in-game acceleration is close to the real one.
 
zedextreme8177
^ I think by saying the gearbox is too slow, they mean the shifting itself (time between the gears to be clear) takes too long compared to the actual GT-R. Though it's pretty impressive since the in-game acceleration is close to the real one.
Click to expand...

GR-R in GT5 prologue had same acceleration rate as real life. 3,6s.

And i even tested it. It's nothing new :) Most of cars are like that.
 
Wow - I thought it was only me.

My DFGT gas pedal had the "flutter" problem, which I fixed last week by opening the spring and then filing down the stopper for the potentiometer.

This seemed to fix the problem for about a day or so, when this exact thing with the 2012 GTR on Nurburgring happened to me this weekend. It immediately got me so upset, because I thought it meant my pedals were now beyond repair.

I was even about to purchase a G27 because the DFGT pedals are so sucky, and I can no longer play this game with the DS3. And then I read this thread.

Whew - this is good news for me!!! :dopey:
 
Perkel
That don't look like LC at all it is just proper way of starting ... ??

As i know in GTR it's breaking , then gas with brake on, when it gets to 4000 it will stay there and then you loose brake ...

right ? :dunce:
Click to expand...

Well that's exactly how the launch control works in the real car so...
 
Perkel
That don't look like LC at all it is just proper way of starting ... ??
Click to expand...

+1

It is like that for every car in the game guys, brake and you can rev it up to a point where you think it will launch best...
in non AT's you just put it in neutral.
If driving AT you do it like that, press brake, rev up, let go of brake...
Since GT1...
 
speedthrill
+1

It is like that for every car in the game guys, brake and you can rev it up to a point where you think it will launch best...
in non AT's you just put it in neutral.
If driving AT you do it like that, press brake, rev up, let go of brake...
Since GT1...
Click to expand...

But is it limiting to 4k or is it revving to redline? I think he's trying to say that if you press the brake and floor it, the lc limits the rpm at 4k automatically. You can then just drop the brake and go, as in any real car with lc. It seems crazy to me but I'm gonna try it when I get home.
 
speedthrill
+1

It is like that for every car in the game guys, brake and you can rev it up to a point where you think it will launch best...
in non AT's you just put it in neutral.
If driving AT you do it like that, press brake, rev up, let go of brake...
Since GT1...
Click to expand...

Wait, is that all they were describing? I should have thought of that...

EDIT: No; the revs rise when you press the brake only. :scared:
 
oh. i remembered my session with GT-R on daytona in GT5 prologue as i tested if it will go 3.6 and was blown away when it exactly matched rl :) Small things can sometimes bring happines :)
 
themartlab
Not too sure about this but I've noticed this on cars which uses in real life DSG gearbox. In GT5 it does that with the GT-R, Lexus IS-F, Bmw M5 , Veyron, and probably few others I just didn't notice. Maybe it's cause by the DSG or other twin-clutch system?
Click to expand...

Correct me if I'm wrong, but most if not all of the above have launch control.
 

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