High speed ride now getting dangerous

[dtp]

This thread is pointless. If you drive more than speed limit on public road, it is dangerous for yourself and for public. End of story
High speed is for race tracks only. Drive safe everyone

[First]

There are instances where super highways can be driven at high speed and yet relatively safe. Not only the Autobahn has the best super nicest highway in the world. We have to open our eyes.

This thread is not pointless. It is definately vital to know. Stop being a troll and safety preacher. Lets stay on topic

[Swiss Frank]

Just as a data point, my "rocking horse", at 1000km (actually 1100km) was still exact to factory spec.

Since I haven't had a new car since the 90's 8-), I must say that about 10-15% of my original stiffness seems to have gone away and is probably just a product of a totally fresh, un-broken-in car. Maybe the next 10k km will help mellow it out.

[Swiss Frank]

I've driven probably 100 hours on German autobahns, usually 225kph in the E39 M5 and 200kph in the Supra.

The surface is "rough" like sandpaper, though typically well-maintained.

The other drivers' lane discipline is good but there are **many** other drivers.

In comparison, Japanese country highways are **perfect** and **empty** . Even though Autobahn is unlimited and the Kosokudoro is 100kph, it is clearly not the case that the Autobahn is more safe.

[psd1]

Originally Posted by First

There are instances where super highways can be driven at high speed and yet relatively safe. Not only the Autobahn has the best super nicest highway in the world. We have to open our eyes.

This thread is not pointless. It is definately vital to know. Stop being a troll and safety preacher. Lets stay on topic

Hmmm, I would have to disagree, the A-Bahn is nice, but it isnt the end all beat all people think it is. The wide lanes are nice, but alot of it isnt as well engineered as people talk about. The US Interstate system is on par...but unfortunately there are MPH restrictions everywhere...unlike the A Bahn where they allow a nice brisk pace in areas.

Weird that Clarkson didnt mention any high speed problems in his review...

[tokyogtr]

Originally Posted by vishnus11

For your consideration and viewing pleasure.....

2009 Nissan GT-R Ultimate Road Trip - Inside Line 2,000 Mile Road Test

Enjoy

Cliffnotes
- Edmunds drove the car 2000 miles for days on every surface possible in every environment possible. Tracked it/drag raced it/you name it....
- They specifically state that they set the cruise to 112mph for some time (~180kph) - to be fair, OP said that this mythical phenomenon appeared at higher speeds.

This car has been tested ON EVERY POSSIBLE surface by MULTITUDES of tester in MULTIPLE environments. NOT one....NOT ONE person has ever said that the high-speed stability of the car has been anything but faultless.

If I were you, I would get your car checked for faulty suspension components. Until you do that, I find it difficult to believe this 'tale'.

EDIT: This car wasn't designed by children. It was designed by the world's best engineers. Cars in this vein never have 'faults' or 'improper calibration' of key components. They DO sometimes have certain character traits. For example, an S2000, especially an earlier model, was quick to rotate if driven clumsily - but his was a virtue of having calibrated the car to provide this trait - to this day, some people still prefer this version the best. Same story with the Audi TT - it was initially set-up for neutral to oversteer type handling, but Audi's typical clientile have no clue what oversteer is and found themselves spinning out a high speeds. To say the GT-R has a 'problem' after all the exhaustive testing and development, is to very bold, and likely...very stupid.

come to tokyo and drive my car. seriously. then you tell me what the pitching side to side could be down to... i'm not making this up and no, there's nothing wrong with the suspension setup on my car. in fact, i think i'm the only person to ever post his 1st service info sheet with all the geo settings checked and confirmed by the HPC.

for some reason you really really think i'm making this stuff up just to p1ss people off. sorry to all the fanboys out there but this is a 1st generation R35 and there's still some work to do.

if you don't believe me, check the quote on the amuse or mine's video where the driver says the tuner could teach nissan lots of lessons about suspension.

now if you want to keep saying i'm wrong and quoting magazine's who still have the limiter on the car then go for it.

[First]

Originally Posted by psd1

Hmmm, I would have to disagree, the A-Bahn is nice, but it isnt the end all beat all people think it is. The wide lanes are nice, but alot of it isnt as well engineered as people talk about. The US Interstate system is on par...but unfortunately there are MPH restrictions everywhere...unlike the A Bahn where they allow a nice brisk pace in areas.

Weird that Clarkson didnt mention any high speed problems in his review...

Psd, if you read again what I wrote, its exactly what I meant you're trying to say. That A Bahn is overhyped. Lots of other places have highways just as nice. If you guys seriously think A Bahn has the best, seriously some of you should go to Dubai and take a look at their roads.....

[charles charlie]

Originally Posted by tokyogtr

OK, so you've heard me mention how great the power is but the high speed handling needs tweaking. Well, it's getting worse. The car behaves so erratically when on fast highways with any bends that it's almost dangerous. On the circuit there's none of this but on a public highway above 180kph beware, it pitches like a SOAB. I've tried comfort, normal and R modes but it's always the same which means the springs are just not up to the job. When I spoke to mine's they said they had lots of complaints about this. Apparently the springs they supply will not fix the problem. This means either waiting for springs or going with a full suspension upgrade and therefore deleting the Comfort/Normal/R mode altogether and being stuck on R.

If the shocks really cannot be made to handle the weight of this car with any types of springs on highways then I will have to trump up the Yen1m to replace them. Or, wait to see if the Euro version is any better based on feedback from the JDM owners.

I'm going to have one last crack by speaking to the HPC and see if they will have any advice but JDM buyers beware, this car is NOT good on highways at high speeds. It's just too "bouncy".

So if I understand you the problem is poor rear grip under fast cornering, leading to the rear bouncing on the tarmac?

[tokyogtr]

Originally Posted by charles charlie

So if I understand you the problem is poor rear grip under fast cornering, leading to the rear bouncing on the tarmac?

no, grip is fine. it's the bouncing/pitching that's the problem. you have to be very very careful.

just to add, there have been quite a few crashed GT-Rs already which might be down to the instability on rough surfaces. it's compounded when you brake on those surfaces.

[charles charlie]

Originally Posted by tokyogtr

no, grip is fine. it's the bouncing/pitching that's the problem. you have to be very very careful.

just to add, there have been quite a few crashed GT-Rs already which might be down to the instability on rough surfaces. it's compounded when you brake on those surfaces.

Thanks mate.

The reason for my question is I'm trying to understand where the problem lies. Given the only difference when cornering at high speed compared to straight line is the increased lateral forces and changing the setting of the dampers has little or no effect leads me to guess the issue is one of insufficient downforce or even too much stiffness in the runflats.

Almost forgot!.....

Or do you find the car has uncontrolled oscillations front to rear when the road surface is undulating?

I am far from an expert but clearly this is an issue which requires investigation and speedy resolution.

[bonzelite]

a point about the tires as mentioned above, tokyogtr, have you tried different tires?

I'm very disappointed and confused as the R35 was engineered to shine at higher speeds. Above 100mph it should handle perfectly.

[mg1942]

Originally Posted by tokyogtr

if you don't believe me, check the quote on the amuse or mine's video where the driver says the tuner could teach nissan lots of lessons about suspension.

I think it was Gan-san from Best Motoring who said when he was test driving the GT-R at Sendai (correct me if I'm wrong).

Nissan should might as well outsource their suspension/brake development to selected tuners. Nissan should also beef-up and refine the DSGs.

[psd1]

Originally Posted by First

Psd, if you read again what I wrote, its exactly what I meant you're trying to say. That A Bahn is overhyped. Lots of other places have highways just as nice. If you guys seriously think A Bahn has the best, seriously some of you should go to Dubai and take a look at their roads.....

Got it!

[JackyN]

I agree that the GTR really bouncing alot and i think it's the suspension and the runflat tires. I had a very good engineer and he lower my GTR 20mm front and 25mm rear without changing the factory suspension. It help a little after lower the car but what my engineer told me is better to change the tires also because the side wall of the runflat tires is too hard and the tire pressure is 40psi.

[tokyogtr]

Originally Posted by JackyN

I agree that the GTR really bouncing alot and i think it's the suspension and the runflat tires. I had a very good engineer and he lower my GTR 20mm front and 25mm rear without changing the factory suspension. It help a little after lower the car but what my engineer told me is better to change the tires also because the side wall of the runflat tires is too hard and the tire pressure is 40psi.

that's great info. how did he lower the car? yeah, i hate the runflats but the alternatives look quite shite. i might be tempted with p-zeros but don't have great memories of them.