Lakeside Raceway Brekkie and laps - Saturday August 4 2018

**HPRS230** · 04-08-2018, 04:21 PM

Originally Posted by Machine

I remember Yokohama AD08R used to scream like banshees no matter what the pressure.

Oh wow, that's crazy!

Skoda RS230

**Tobes_WIR35** · 04-08-2018, 08:55 PM

I have Bridgestone RE003s. I've found them to be a lot better than the Contis that came on the car. The Contis seemed to have soft sidewalls and I just chewed them up irrespective of pressures.

And don't ever apologize for getting nerdy with me. I'm an engineer so nerdy is what I do best! Haha.

Something just didn't feel quite right today. I know my brakes are getting tired, but the only thing that's different from every other time is the passenger and tyre pressure. Could also just be a reduced level of concentration because I had a passenger. Like you say the only thing I have to go off is the "feel" which is fairly unreliable.

**Machine** · 04-08-2018, 09:16 PM

Originally Posted by Tobes_WIR35

I have Bridgestone RE003s. I've found them to be a lot better than the Contis that came on the car. The Contis seemed to have soft sidewalls and I just chewed them up irrespective of pressures.

And don't ever apologize for getting nerdy with me. I'm an engineer so nerdy is what I do best! Haha.

Something just didn't feel quite right today. I know my brakes are getting tired, but the only thing that's different from every other time is the passenger and tyre pressure. Could also just be a reduced level of concentration because I had a passenger. Like you say the only thing I have to go off is the "feel" which is fairly unreliable.

I had those tyres before the Michelin PS4S, but never used them on track. They didn’t impress me much. I agree, though, they’re probably better than OE Continental.

You didn’t have your handbrake on, did you?

Make no mistake, 80kg up front on one side of the car will make a big difference. Especially if it can’t keep its mouth shut. LOL

So what did you set your pressures to, anyway? I’m curious to know the difference between last time and today.

**Tobes_WIR35** · 04-08-2018, 09:25 PM

I usually set them at 33-34 cold, today I ran 37 cold. What do you reckon the air temp inside the tyre would be after a few decent laps? Pressure rise is linear to temperature rise at a rate of about 1PSI per 5 degrees C. I filled them up last night and had only drove 200m up the road, so temp them was probably about 20 degrees. Tyre air temps on the track?? I'm guessing maybe60-70 degrees?

So the 37PSI cold becomes 45-50 on the track.

**HPRS230** · 04-08-2018, 09:40 PM

I had a 6-7psi increase mate. I didn't have time to click the temp button...

Not cold, Warm after driving out.
35/36 - 42/42
36/36 - 42/42

I'll get cold pressures tomorrow, I'm expecting another 2-3psi lower again Tbh.
Edit cold (9am @17°C) would rather have done at 6am and alot colder....
32.8/34.1
34.1/34.5

**Machine** · 04-08-2018, 10:43 PM

Originally Posted by Tobes_WIR35

I usually set them at 33-34 cold, today I ran 37 cold. What do you reckon the air temp inside the tyre would be after a few decent laps? Pressure rise is linear to temperature rise at a rate of about 1PSI per 5 degrees C. I filled them up last night and had only drove 200m up the road, so temp them was probably about 20 degrees. Tyre air temps on the track?? I'm guessing maybe60-70 degrees?

So the 37PSI cold becomes 45-50 on the track.

Whoa, now you’ve gone full geek on me

It was pretty cold this morning, so I dare say with only 37 psi cold, you still didn’t have enough air. Insufficient tyre pressure is my diagnosis. Do me a favour and try at least 40 psi on your next outing and see how it feels. Remember, you can always come in for a minute and bleed your tyres if you don’t like it. Much harder to add air...

**prh1973** · 05-08-2018, 04:10 PM

Thanks all to those that supported this event. I'm sorry we didn't get the full allotted time due to the incident on track. We are very lucky to not have some very damaged cars and is a timely reminder to us all that if you do end the session for everyone you are banned from all our future events.

The next event thread is now up on the forum and is at Qld Raceway Sunday September 23.
Queensland Raceway Brekkie and Laps - Sunday September 23

**Machine** · 05-08-2018, 04:30 PM

The two drivers closest to the offending driver were clever enough to avoid his ridiculous loss of control. It’s another example of a high-powered RWD driver quickly running out of ability. When does everyone get to see the video? It’s a good dose of education.