Why does the steering wheel turn to the left? Measuring the tire groove of Porsche 911 Carrera

Left tilt of handle

Participate in Porsche driving lessonsAfter that, I wrote earlier that Porsche 911 Carrera became "the car is in a straight state, but the steering wheel is tilted a little to the left".

Click here for past articles→ Porsche 911 steering is no longer straight

When I wrote this, I received various advice such as "If you adjust the alignment, it will be fixed soon", but for the time being, the steering wheel is tilted to the left, but the car itself runs straight, so the steering wheel is getting more and more to the left. It does not mean that it will be done.

Therefore, I decided to keep watching until the next tire change (it is still too appropriate).

My husband even said, "If you tilt the crest mark in the center of the steering wheel a little to the right, Rika probably won't notice the tilt of the steering wheel, and that's okay anymore" (laughs). Terrible ^^

When I saw it right after the PTX, the tire scraps were too much, so it was "this is the cause", but now I have worked hard many times to remove the tire scraps, so the tires are in a fairly beautiful state. ..

Even so, the steering is still slightly tilted to the left, so it seems that the tire residue is not the cause.

This is the state when there are still a lot of tire scraps ↓

The theory that the steering is bent due to the difference between the left and right tire residual grooves

So, this time, I hypothesized that "maybe the difference in how the tire grooves are reduced is the difference in how the tires are reduced" (why not change the tires obediently (laughs)), and measure the remaining tire grooves of the black carrera. I decided to.

Although it is a hypothesis, I am just doing various things based on my own interests ^ ^

I've always been indebted to youPorsche Center Ginza Koishikawalooks.

The reason I went to the Porsche Center was not to have the tire remaining groove measured there, but to borrow a tool. Another strange customer ^^

I have a tool (measuring instrument) called Nogisu in my house, but I couldn't measure it properly because the width was too narrow for the groove of the tire.

The black one on the left is my caliper, and the one on the right is the one I borrowed this time ↓

At first glance, it looks the same.

Yes, the one I really needed here and wanted to borrow is this small tool (measuring instrument) ↓

Here. This is the one circled in yellow ↓

This is also a measuring instrument, and since it has a width that can be measured firmly with respect to the tire groove, it has become possible to measure the tire groove more accurately by using this.

I'm not good at this kind of thing, but when I was already looking at these calipers, I had no idea what it was, but after measuring the groove with this small measuring instrument, attach it to this large one and read the numerical value. I just managed to understand that accurate measured values would come out.

My husband and salesman were talking to each other quickly, so I just asked next to me thinking "I don't understand" ... ← People who can't use it even though it's their own car.

In addition, the salesman prepared a memo so that he could enter the measurement results, and he even wrote down the direction of the car and the four tire values so that he could enter them properly.

What a person you can do! !! Great. thank you.

Oh yes, I'm sorry.

Since it was a time when the parking lot of the PC was still vacant in the morning, the measurement was done at the parking lot of the Porsche Center.

At the parking lot of the Porsche Center, a strange customer who borrows a tool and measures the tire groove is here.

Furthermore, while writing "I measured", I can not actually measure it myself, so I asked my husband to do everything, I just took notes next to me ... After that, "Mr. Black Carrera is too nice" I just fell in love with Porsche ^ ^

Black Carrera tire residual groove

Well, the result.

This is the tire residual groove of Porsche 911 Carrera after participating in the PTX master course.

Since it was measured by human hands under the cold sky (especially the rear tires could not be bent and the hands were held in), it was thought that it might not be possible to measure so accurately, so just in case. For this reason, we are measuring the parts that are slightly offset twice.

Therefore, there are two numerical values for each of the left and right "outside, center, inside" grooves.

The upper row is the first measurement value, the lower row is the second measurement value ↓

The inside of the rear is decreasing.

However, it was said that the reduction of the rear tires would not affect the steering tilt, so when looking at the front, yes, the left and right fronts are both outside and inside, "the left side is reduced. You can see that.

It's a slight difference, but it seems that these few millimeters are also quite different (I'm sorry I don't understand well).

The PTX Master ran the Fuji Speedway main course, so it's certainly basically all the way to the right.

Since it turned clockwise on the circuit, the left tire decreased more than the right tire, and the difference caused the steering to tilt slightly to the left. ??

For the time being, it seems that the hypothesis that "the groove of the left front tire may be smaller than that of the right front" was correct.

After all, I don't know what I wanted to do (laughs), but I was able to see what I was wondering as a numerical value for the time being, so this time I am very satisfied with this.

After that, the center of the front tire has not decreased so much, so it is better to raise the air pressure a little more, so I would like to adjust that area as well ^ ^

It's interesting to see various things when you take data.

Porsche Cayenne Coupe wrapped in blue metallic color

On this day, when I looked around the showroom of Porsche Center Ginza Koishikawa, I suddenly saw it.This Cayenne Coupe..

When I asked, "Is this color genuine if it is a Cayenne?", It seems that this car is a fully wrapped car.

Previously, a woman I knew was riding a "Violet Mercedes", but when I saw the actual car in front of me, this Cayenne also looked like that.

If it is a nice wrapping (maybe it can be said), the original color may be visible around the side when the door is opened, but this Cayenne was all wrapped even if the door was opened, so I didn't notice the wrapping when I opened the door.

In order to check the original color, I had to open the engine hood and look at the back side.

The original color is "Quartzite Gray Metallic".

I was able to confirm the original color around the part surrounded by yellow ↓

If it is wrapped beautifully in this way, I really do not know whether it is wrapping or colored ~ ^ ^

Last but not least, I'm glad I was able to measure the rest of the black carrera tire grooves this time.

There may be more grooves than I expected, so maybe one or two more times before changing the tires? Wanted to take part in a driving lesson.

Join us ~ ^^

Related article:
◆ Porsche 911 steering is no longer straight
◆ I want to make Porsche 911 tires 20 inches
◆ PTX 2021: Porsche Truck Experience [Master] Circuit driving
◆ Porsche tire change (second time)
◆ Tire related article list