Lakeside Raceway Brekkie and laps - Saturday August 4 2018

[prh1973]

Machine is an old hand to track work and achieved great times on track. He knows what to do. He also used to run these events.

[Mattlock]

Machine is an old hand to track work and achieved great times on track. He knows what to do.

LOL!


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[Machine]

I’d hate to cook my tyres. What about traction control? Do I have to leave it on? And even though it’s not a race, I’ll have to wear my new race suit and helmet that I bought just for Happy Laps, because I want to be really safe.

[Machine]

LOL!


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Sorry mate, that was too much fun.
P.S. A wheel bolt torqued to 9 ft lbs would definitely fall out
P.P.S. Everything you said is correct. I agree ����

[Mattlock]

Sorry mate, that was too much fun.
P.S. A wheel bolt torqued to 9 ft lbs would definitely fall out
P.P.S. Everything you said is correct. I agree ����

Haha. Pain meds and seeing people trash these sessions in the past had me worried!



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[Tobes_WIR35]

I’ve never tightened up wheel nuts. Remember this is happy laps so you’re not really putting too much strain into the car in the corners.

I do, however, check all my fluid levels and inflate the tyres by about 3-4 psi above my normal running pressures to help the tyres cope.




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I do the opposite, normally drop 2-3 PSI below road pressures.

[Machine]

I do the opposite, normally drop 2-3 PSI below road pressures.

Not recommended, unless you're running semi-slicks (R compound). The sidewalls of any street tyre, even high performance, generally need the extra pressure to stand up. It's fine, though, because like Mattlock said, it's not racing, but I'd be surprised if you said your car didn't "feel" better in the corners with adding 5 psi above cold road pressures.

Dropping the pressures even more severely will cause the sidewalls to collapse and the shoulders to roll over, potentially causing the bead to unseat and come off the wheel, resulting in catastrophe. It's happened on the track with underinflated rubber.

[Tobes_WIR35]

Not saying you're wrong, but I am a bit surprised because that is the opposite of what I've read pretty much everywhere, and from my father in law who has been in motorsport for 30 years (owned & ran a V8 supercar team). My understanding being that by dropping slightly below cold road pressure, the heat induced will raise the track pressure back to a few psi above cold road pressure. For example I run 280kpa on the road as per the tyre placard, but will drop back to 260kpa for track days (cold pressures). I haven't measured them (maybe I should) but in theory the hot pressure should then be around 300ish ... unless my engineering degree was a waste of money that's the theory side at least 😂

[prh1973]

Some people like to corner hard as soon as they go out on track. This is why we say bump up the pressures so they don't roll the bead off the rim. With good high performance tyres if you are sensible and wait for the tyre to pressure up before going hard you can run with a few psi lower starting cold pressure. This way they wont over pressure and less likely to start losing grip from too high a pressure when hot later in the session. This is my experience.

[Tobes_WIR35]

Some people like to corner hard as soon as they go out on track. This is why we say bump up the pressures so they don't roll the bead off the rim. With good high performance tyres if you are sensible and wait for the tyre to pressure up before going hard you can run with a few psi lower starting cold pressure. This way they wont over pressure and less likely to start losing grip from too high a pressure when hot later in the session. This is my experience.

Yes, totally agree and this has been my experience too. I probably should have been a bit more thorough in my initial post.