Brought to you by TheJudge13 contributor Mattpt55 & Friends
— Petr Hlawiczka (@hlawiczka) September 3, 2015
— James Allen (@Jamesallenonf1) September 3, 2015
TD: TourDog (no Twitter hence why he still gets things done)
The following speculative conversation occurred earlier today. Kibitzing highly encouraged
VM: Interesting thing about the Pirelli stories today is the tire pressure recommendation rather radical. 5psi higher is huge. I can’t find the justification for that either. The 0.5 degree camber change is justified as per the prior Pirelli pre-Monza press release.
VM: If anyone finds some technical justification on 5psi over inflation, let me know… I’m curious about it.
Mattpt55: Well, basic physics says higher pressure should equal lower rolling resistance, therefore lower temps but less suspension benefit
Mattpt55: also better fuel economy
Mattpt55: Just had a thought. Wonder if exceptional number of cuts due to lots of 4 wheel off driving at Spa. If we take the normal circuit and guess that only 2 wheels off then simply having all 4 off at corner doubles chance of off line debris pickup
VM: Higher pressure equals smaller footprint. And the tread will “crown” which means primary work (footprint) is done by middle of tread. It’s very strange, and unjustified technically. AFAIK, it’s unjustified. If my supposition is correct, Pirelli are very gun shy at the moment.
VM: Guessing the tires will wear a little sooner due to lesser footprint, to ensure goal of 2 to 3 pit-stops, but not sure. But 5psi is rather radical. Only Hamilton has the courage to call Pirelli on this, which is also interesting.
Mattpt55: OK going off bike tyres about which I know more, lower pressures equal better grip softer ride and more chance of pinch flat if you hit large enough edge.
TD: When you are in front, change is bad. Lewis wants status quo until victory is secured.
Mattpt55: Tread will only crown I would think if they tyre is vastly over-inflated
Mattpt55: so the advantage would be less resistance due to smaller contact patch and greater resistance to the sort of damage kerbs do when struck. Perhaps lifting sidewall will help protect the tyres from lateral energy loads of that sort
Mattpt55: I’m thinking arches in architecture being better at distributing load
VM: Footprint changes with changes as small as 0.5 psi. You control the footprint shape with the pressure.
VM: OK, but let’s be clear about the damage curbs will do… Pirelli did a fairly thorough analysis of the tire structures from Spa and found no damage to the structures of the tires. They also found the rubber itself was holding up. The only problem was the tires being cut by debris.
Mattpt55: Right, but is the change linear with pressure? I would think the amount of change would be more tied to the sidewall construction
Mattpt55: Perhaps they were concerned about tyres and bodywork. I know Mercedes ran flo viz to see and the tyres weren’t touching but it did look awfully close on some of those slo mo shots
VM: So over inflating the tires is unrelated to what happened at Spa except if it forces faster wear to ensure no team gambles on a single stopper… It’s a rather radical action to take to force a 2 to 3 stopper to my mind.
Mattpt55: I suppose they probably have several different recs depending on parameter they wish to optimize
TD: There were also several curbs added and removed over the course of the weekend. A tiny piece of metal sticking up from a piece of rebar could go virtually unseen. Either the pressure in the tires, it could even be a fraction of an inch below the track surface, and when the asphalt compresses, it would expose the metal.
Mattpt55: And it may be a bit of a reach to say wholly unrelated to Spa. They may have seen indications in data at high speed that they wish to have greater margins for in Monza
Mattpt55: But as far as publicly, then yeah
VM: So frustrated with F1 right now because of BS like this, and track limits issues… In this case it appears Pirelli is taking advantage of the situation to force 2 to 3 stoppers by crowning the tires. That comes from reading books on chassis tuning, and tuning a race car and some karts…
VM: But no one is talking about the technical merits of this. Perhaps Ted’s notebook, or someone will expose this during the weekend.
TD: According to that article, braking distances will increase.
VM: I think that’s the biggest.
VM: So what we may expect would be lower corner speeds, longer brake zones, and tires wearing in the middle of the tread. Candidly it may make this race more exciting.
Mattpt55: But not as exciting as randomly exploding tyres
VM: Wow! Pirelli is blowing up Monza. Now we have this amazing statement:
Statement from FOM – i.e. Bernie Ecclestone – on the Pirelli situation http://t.co/VBDFsG7Ds9
— Andrew Benson (@andrewbensonf1) September 3, 2015
Love this reaction from the paddock, btw:
Extremely bizarre and rare statement from Formula One Management (i.e. Bernie), basically saying how much they love Pirelli.
— Daniel Johnson (@danielt_johnson) September 3, 2015
VM: That was FOM saying Pirelli has done what we asked, and thank you for that. Means negotiations must be entertaining behind closed doors between FOM and Pirelli.
VM: Then we have team engineers telling Pirelli BS on over-inflating by 5psi. So Pirelli has backed down…
#F1 After criticism by teams Pirelli will lower tyre pressure by 1 PSI (22 PSI front / 21 PSI rear). Engineers warn it's still way too high.
— Tobias Grüner F1 (@tgruener) September 3, 2015
Only over-inflate by 4psi. Golly!
TD: Know any good artists? We need a caricature of Bernie stroking a lap dog with a name collar that says “Pirelli”