37 Degrees on Weds - What will happen to grip?
Discussion
well put iguana, I'll be setting the pressures a few psi lower then normal and going out for a few laps then coming in to check the pressures and more than likely letting some air out so they are at the normal road pressure setting when stinking hot. I find this approach means you shouldnt over heat your tyres too much and you just put some air back in before you go home.
Also worth while remembering to keep a check the coolant temp too when your on the straights if its going to be that hot. In fact I tend to use the starights for a quick breather relax the hands and arms and a check of the gauges. ohh and obviously a look in the mirrors to make sure i'm not holding up a faster car
Also worth while remembering to keep a check the coolant temp too when your on the straights if its going to be that hot. In fact I tend to use the starights for a quick breather relax the hands and arms and a check of the gauges. ohh and obviously a look in the mirrors to make sure i'm not holding up a faster car
iguana said:
Depends what car & what tyre.
Heavy car on road tyres, sure they will overheat qiuckly & will have naff all grip & its easy to properly shag the tyre.
Light car on race rubber & they can grip like a limpet.
Either way its especially important to keep a keen eye on pressures.
Heavy car on road tyres, sure they will overheat qiuckly & will have naff all grip & its easy to properly shag the tyre.
Light car on race rubber & they can grip like a limpet.
Either way its especially important to keep a keen eye on pressures.
Iguana, thanks for this. The 350Z is known for its lardiness so I guess I should expect a lot of heat getting into my Toyos. Normal pressures are 35psi, what would you recommend dropping them too?
pikeyboy said:
Also worth while remembering to keep a check the coolant temp too when your on the straights if its going to be that hot. In fact I tend to use the starights for a quick breather relax the hands and arms and a check of the gauges. ohh and obviously a look in the mirrors to make sure i'm not holding up a faster car
Great advice!
Might be a good idea to actually ease off down the streights to prevent overheating the cooling system. With that kind of ambient temp I'd be struggling to do more than a few laps before I need to take it easy for a lap. The rx does run warm this time of year though!
Just done a session last Sunday at a seriously hot Zandvoort track in the middle of the day - loads of grip and traction, loads of treadwear in comparison with former track outings (~1,200 kg FWD car, close to 300 hp, Toyo Trampio R1R semi-racing compound tyres). No signs of overheating or going 'off' towards the end of a 35 mins non-stop session.
combemarshal said:
Try that in a BMW or audi, It would give up and die!!
Yeah, but then again the Saab has been seriously modified for the job (albeit not a totally stripped/caged track toy, something of a multi purpose vehicle, this
) - brake pads, for example, are Ferodo DS 3000 and the engine is basically a slightly detuned version (smaller turbo/injectors/chargecooler) of what Sweedspeed normally builds for Touring Car/German Youngtimer racing. Impressive was a BMW X5 in another session though - no, it wasn't super quick, but it went round consistently and without any histrionics for the entire session. There was also a very well driven Griffith in that session, all looked very neat, tidy and quick. TBH I was kind of surprised how well most cars were coping with the conditions - I've seen more crashes than smoke billowing stranded vehicles on the day.There's a video floating about on the web of someone doing a fast lap of the Nurburgring in an RS6 Avant, the driver gets to the last corner before the tyres give up the ghost, brakes were utterly destroyed also 
[EDIT] Found it: www.youtube.com/watch?v=407c4ae_2Xc
[EDIT] Found it: www.youtube.com/watch?v=407c4ae_2Xc
Edited by Digital on Thursday 20th July 14:58
I've never known tyres go off so quick!! I was doing approx. 5 or 6 laps of Silverstone GP circuit before I started sliding all over the place. Great fun though and glad I just did the evening session as all day would have totally shagged the car.
Thoroughly recommend Goldtrack, although £135 for a 2 1/2 hour session was maybe a tad expensive.
Thoroughly recommend Goldtrack, although £135 for a 2 1/2 hour session was maybe a tad expensive.
I rest my case!!
I know what the problem is, it's the horid stability control Audi use, even with it turned off it's not turned off, so if you pushing hard the car will be using the makes most of the time!
Oh, and he needs to be show what a racin line is, he should have had that porsche weeks before he did!!
I know what the problem is, it's the horid stability control Audi use, even with it turned off it's not turned off, so if you pushing hard the car will be using the makes most of the time!
Oh, and he needs to be show what a racin line is, he should have had that porsche weeks before he did!!
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