Dare to run the Porsche 911 GT3 in heavy rain. To what extent can cup tires be used?
Release date: 2019.07.27
This time, my husband wrote an article about running GT3 in the rain in early July. Please see if it is good.
One month passed GT3 delivery ...
This year's Kansai region has had a rather late rainy season, but it has finally become a full-fledged rainy season. The GT3 has been delivered, and more than one month has passed, and in order to try out the driving performance in the rainy weather that I was worried about,In heavy rain, try to bring GT3 to RokkoIt was to be.(Normally, I can not do that ..)
On the day, when you check with the smartphone's weather forecast app, a heavy rain forecast. Looking at the rain cloud radar, it seems that a red rain cloud approaches the Rokko Mountains and it will rain about 30 to 50 mm / h from here. Get ready and get on GT3.
It's a great test environment.
By the way, I am self-proclaimedBad Weather Drive ManiaAnd I really like driving rain and snow quite well (laughs)
This time, the point which I would like to confirm is the new car fitted to GT3Michelin pilot sport cup 2 tiresThe wet performance of Since I like long distance touring, I often encounter guerrilla heavy rain etc. So in advance,I wanted to know how much performance there was.
By the way, the wet performance of the tire is largely divided into two indices.
The first isGrip performance on wet road surfaces. And one moreWater drainage performance (hydroplaning resistance)It is. Even if you look at the Michelin site and the technical information of the tires, as far as I have examined, there is not a place where the two are clearly written separately, and I wanted to make it clear because I was put together with the wet performance. .
Run GT3 in heavy rain
Use K16 (Akashi Kobe Takarazuka Line, commonly known as "Higashi Rokko Driveway" section) to head to the top of Rokko Peak.This road is better than 8 am if you run on a holiday.After about 8 o'clock, the minivans will aim for the Rokko, so they will always lead the safety car.
However, due to heavy rain on this day, there is no traffic and it is almost leased.
We try to feel the cup tire while raising the fearful pace.
There is no problem at all for running normally. I do not feel any difference with a normal tire.Next, while raising the pace a little, try to put a lateral G on the curve. Even here I grip normally than I thought.
What a surprise
Even if you try to raise the pace a little further, there is no problem at all if you run at a pace earlier than the general road. If you step on the accelerator from the second gear at the exit of the curve, etc., it will slip! Although the rear slips, PSM controls immediately.
As grip performance on wet road surface,I felt that it would be safe to run if I ran on a general road at a speed that is common sense.Even if it is a sudden heavy rain, it looks good without getting nervous.(However, be careful when the temperature is low, such as in winter)
Among the things I've experienced so far, I felt that the wet grip was the highest "Goodyear Eagle F1 Asymmetric 2." It gripped really well on wet road surfaces. Despite being midshipped, Boxster felt at ease, for example, even if he flew the heavy raining Mt. Compared with that, I think it's inferior but it still needs enough performance.
Next we will try drainage. The pilot sports cup 2 is a so-called shallow groove tire.Even a new item has only a 5.4mm groove, and it is clearly shallow compared to 7-8mm of a general tire.However, the depth of the ditch seems to be improved by about 23% compared to the previous sports cup.
In order to test drainage performance, it is really risky to actually try to drive at high speed, but I do not do it, but try to feel a change in the feeling of touch on a general road where water flows like a river. I made it.
First,If the road surface has water on the order of several millimeters, it is no different from a normal road surface.In particular, unless there is a hydroplaning phenomenon, there is no need to take the steering wheel. ProbablyWith permeable pavements used on many modern freeways, moderate rain would not be a problem.
On the other hand, if it is a clear puddle or a road with enough water to flow, it is easy to take the steering wheel. Because there are no longitudinal grooves on the outside of the tire, it is better to pay particular attention to curves and other features. It is subjective, but it is a feeling like 5 to 7 when the difficulty of taking the handle of an ordinary tire is 10. So,When you drive on a rainy expressway, it depends on the situation, but it runs at about 80km / h to 90km / h, and I think it is better to be careful of large pools.
In particular, expressways that should be changed from water-permeable pavements to ordinary pavements should be run carefully. Permeable pavement tends to fly in a good condition, but I think there is a high possibility that hydroplaning will occur at the moment it suddenly becomes ordinary pavement.
I thought it would be a more unstable tire until I tested it, but on the common sense run,The wet grip does not need to be so nervous.With this, I think that it can be used enough even in sudden rain and bad weather in long distance touring.
on the other hand,In terms of drainage, it is better to be cautious as the number and depth of grooves are physically smaller.
MoreI was thinking of replacing it with Almighty Pilot Sports 4S early, but with this, it looks good to see a little more.The ditch gets a bit shallower, and it's not late after experiencing more situations. Also, if there are any new discoveries, I would like to review them later.
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