How can teams resolve tyre issues?

Here are our CFD links and discussions about aerodynamics, suspension, driver safety and tyres. Please stick to F1 on this forum.
Jersey Tom
Jersey Tom
166
Joined: 29 May 2006, 20:49
Location: Huntersville, NC

Re: How can teams resolve tyre issues?

Post

Actually, when rear tyre rates are too low, increasing rear pressures will improve rear CPL control. This at the expense of rear contact patch area. One helps, the other hurts.
Increasing inflation pressure.. and inevitably decreasing footprint area.. does not necessarily reduce steady-state grip. Can just as easily go up.
Grip is a four letter word. All opinions are my own and not those of current or previous employers.

DaveW
DaveW
239
Joined: 14 Apr 2009, 12:27

Re: How can teams resolve tyre issues?

Post

Jersey Tom wrote:Increasing inflation pressure.. and inevitably decreasing footprint area.. does not necessarily reduce steady-state grip. Can just as easily go up.
I accept, but I suspect a veritable army of race engineers throughout the world would not.....

Jersey Tom
Jersey Tom
166
Joined: 29 May 2006, 20:49
Location: Huntersville, NC

Re: How can teams resolve tyre issues?

Post

The ones who win on a consistent basis seem to accept it.

Shows up in lab. Works on track. :shrug:
Grip is a four letter word. All opinions are my own and not those of current or previous employers.

marcush.
marcush.
159
Joined: 09 Mar 2004, 16:55

Re: How can teams resolve tyre issues?

Post

you guys make me think ...

User avatar
JohnsonsEvilTwin
0
Joined: 29 Jan 2010, 11:51
Location: SU 419113

Re: How can teams resolve tyre issues?

Post

Very interesting insight from anthony davidson on BBC sport during free practice today.

He says the two most important factors in F1 with regards the tyres is
1) Temperature
2) Road surface, or more specifically road surface adhesion.


And finally its when these two factors converge, who's chassis deals with whatever issues arise, best.
More could have been done.
David Purley

DaveW
DaveW
239
Joined: 14 Apr 2009, 12:27

Re: How can teams resolve tyre issues?

Post

I don't have too many issues with Anthony Davidson's statement (without being too specific about "temperature"). The remaining, & not so easy, task is to get the tyres to, & keep them at, the optimum temperature(s)....

User avatar
747heavy
24
Joined: 06 Jul 2010, 21:45

Re: How can teams resolve tyre issues?

Post

@ Marcus

I believe you, and can relate to many things you say.
I have worked on both side of the fence team/supplier and know first hand
that there is very limited feedback from teams at times.
Tires are maybe a bit different, but for components like dampers/clutches/gearboxes etc. it´s quite common for teams not to go back to the manufacturer and to tell them what they have found with his product.
This is especially true if the supplier supplies other teams as well, or in worse case it`s the only supplier. The fear is that the supplier will pass your findings along to other teams as well, or improve his product - in any case you may lose your (temporary) advantage.

I can find good reasons for both sides of the argument, but at least for me, I think that ultimately it pays of for both parties if you have a good, trustworthy and open relationship.

Funny thing is, that I have seen teams which where the worse (in terms of on-track performance) being the most secretive and paranoid.
At the time, even if this team would have printed their set-up sheet on T-Shirts and sold at the track, nobody would have spend much attention, as they where so far off the pace.
Nevertheless, they made me sign a 10 page confidential agreement, before I could set foot in their workshop.

On the other hand, good teams tend to be very open minded, and open to suggestions and recomendations. At least in my expirience.

@ Dave

Sorry, I did not mean to question your story. I can understand it and it makes sense,the same goes for J.T. comments.
My comment was made in the context that (in my limited expirience), tire companies seem to be more worried about low pressures than high pressures.
I never came across a tire engineer who opposed a higher pressure (within sensible limits), but many who are very worried about running (too) low cold pressures.
And I understand there point and see where they are comming from, and I agree with them (most of the time :-) ).

At least in the Touring Car world, high camber settings and low tire pressures are
still a quick & dirty trick to help laptime (most of the time) - at least in the short run.
Pushed to much, this often leads to tire failures later on in the race, but most of the damage was maybe allready done in qualifying.

In this context, I thought that, if teams would fiddle around with their pressure gauges, (often)they would make them read higher pressures to keep the peace and their tire tech happy. I think most race engineers in touring car racing where at one time or the other on the low side of the recommendations - including myself.

It was a cheeky comment - not meant to discredit your story, or what you wanted to say.

Sorry if it has come across any other way - it was not intended that way.

The Salzburgring in Austria is a good example, where tire companies would be very strict with max. camber and min. pressure settings (FL tire), and go to great length to enforce them (STW/GTCC & DTC). Maybe Marcus has some expirience on this track as well.

@ Johnson
in addition to A. Davidson´s statement
here is another take on the situation from Nico Rosberg, highlighting that the problem is complex and track specific.

from autosport.com

>>>>
Rosberg also believes that it is too early for his team to be sure it has overcome the tyre problems that have hampered its efforts at some races this year.

"There is definitely still work to do. It is a very difficult subject which you struggle to understand as a team, and other teams have it too. Nobody really understands what the reasons are.

"We are doing a lot of things to try and improve it, without knowing for sure that is the cure. It doesn't happen at all the tracks, a few tracks it happens.

"It hit us very bad in Montreal and a little bit less so in other places. At Silverstone the problem wasn't really there. I just hope we don't go to another track where it is another issue because it could be a problem again." <<<<
Last edited by 747heavy on 24 Jul 2010, 04:43, edited 2 times in total.
"Make the suspension adjustable and they will adjust it wrong ......
look what they can do to a carburetor in just a few moments of stupidity with a screwdriver."
- Colin Chapman

“Simplicity is the ultimate sophistication.” - Leonardo da Vinci

User avatar
747heavy
24
Joined: 06 Jul 2010, 21:45

Re: How can teams resolve tyre issues?

Post

maybe a little bit off topic, but in the context of driver feel, and the ability to push harder, when feeling more confident.

I remember that while working in the WRC during the early 90`s it was quite common to
have the same tire on different width rims.
It was used to fine tune the handling characteristics and to accomodate different driver preferences regarding the amount of sideslip in the tire.
"Make the suspension adjustable and they will adjust it wrong ......
look what they can do to a carburetor in just a few moments of stupidity with a screwdriver."
- Colin Chapman

“Simplicity is the ultimate sophistication.” - Leonardo da Vinci

User avatar
JohnsonsEvilTwin
0
Joined: 29 Jan 2010, 11:51
Location: SU 419113

Re: How can teams resolve tyre issues?

Post

747

Yes I read somthing to that effect too.

Yesterday on Autosport he elaborated a bit more:

"The main problem [this year] was that the car as a base was not as good as we had hoped. We are developing well with everything, but when the base isn't right then it is difficult.

"We are making the best of the situation now and pushing on well - but the main areas are always the same. It is mainly aerodynamic where we need to progress and we are doing that, at the moment, with a further development here of the F-duct, which should be a definitely step forward. We will see how far it gets us up the grid."

From my reading, the car has an inherrent flaw that cannot be changed this year, most probably due to the homologation rules.
Its aero related, or could be deemed as aero specific.

So if it has a high drag, but low downforce, it will rely more on the common denominator (tyres) to get its performance. And if the tyre has any sort of problem, it will relay that far more vividly in Rosbergs car than the front runners?
More could have been done.
David Purley

DaveW
DaveW
239
Joined: 14 Apr 2009, 12:27

Re: How can teams resolve tyre issues?

Post

747heavy wrote:It was a cheeky comment - not meant to discredit your story, or what you wanted to say.
I thought your comment was valid &, as it turned out, useful. Certainly I was not offended. Wheel design certainly can affect vertical tyre stiffness significantly.

I keep saying that my views are "one eyed", & that is true. Mostly, I get to "see" race vehicles on a rig, & in conditions that are clearly unrelated to a track. I don't even attempt track simulations. To me, a set of tyres is simply something that interferes with the mechanical control of a vehicle. On the other hand, I do "see" a broad range of race vehicles (nearly all, I think), & I do use that experience to try to improve my understanding & hence improve the "service" I can offer to customers. I see that as a strength although, as has been debated elsewhere, correlation is not causation. However, correlation is better than nothing & may indicate causation, if only indirectly (if that is not too philosophical).

Anyway, one of the parameters I estimate as a matter of course during each run of a rig test is vertical tyre stiffness & I have found that, for mid-engined, rear drive vehicles, the ratio of rear/front tyre stiffness lies, almost universally, between 1.1 & 1.4, conforming fairly closely to the static weight "split". Now, I am sure that tyre designers will protest & say that vertical stiffness is just one, relatively minor, property & they can easily design tyres that work & don't conform to my "magic ratio".

My defence against that argument is that tyres do have to work with, & are worked by, the vehicle. Beyond that, I have only experience, statistics, & a bit of "one eyed" logic. I could be unkind & use it to explain why a product of JT's company was unsuccessful a few years ago, also why the (front engined) Panoz LMP had a c.g. position very similar to that of an Audi R8, why some F1 runners were uncompetitive in 2005, & why F1 teams were in such disarray in 2007, when tyres once more failed the "magic ratio" criterion.

Incidentally, & to bring the debate up to date, if you were watching the broadcast of FP3 today, you may have heard that MS complained that the option tyres "lacked balance" compared with the inters. My "one eyed" logic can explain that complaint perfectly....

marcush.
marcush.
159
Joined: 09 Mar 2004, 16:55

Re: How can teams resolve tyre issues?

Post

DaveW wrote:
747heavy wrote:It was a cheeky comment - not meant to discredit your story, or what you wanted to say.
I thought your comment was valid &, as it turned out, useful. Certainly I was not offended. Wheel design certainly can affect vertical tyre stiffness significantly.

I keep saying that my views are "one eyed", & that is true. Mostly, I get to "see" race vehicles on a rig, & in conditions that are clearly unrelated to a track. I don't even attempt track simulations. To me, a set of tyres is simply something that interferes with the mechanical control of a vehicle. On the other hand, I do "see" a broad range of race vehicles (nearly all, I think), & I do use that experience to try to improve my understanding & hence improve the "service" I can offer to customers. I see that as a strength although, as has been debated elsewhere, correlation is not causation. However, correlation is better than nothing & may indicate causation, if only indirectly (if that is not too philosophical).

Anyway, one of the parameters I estimate as a matter of course during each run of a rig test is vertical tyre stiffness & I have found that, for mid-engined, rear drive vehicles, the ratio of rear/front tyre stiffness lies, almost universally, between 1.1 & 1.4, conforming fairly closely to the static weight "split". Now, I am sure that tyre designers will protest & say that vertical stiffness is just one, relatively minor, property & they can easily design tyres that work & don't conform to my "magic ratio".

My defence against that argument is that tyres do have to work with, & are worked by, the vehicle. Beyond that, I have only experience, statistics, & a bit of "one eyed" logic. I could be unkind & use it to explain why a product of JT's company was unsuccessful a few years ago, also why the (front engined) Panoz LMP had a c.g. position very similar to that of an Audi R8, why some F1 runners were uncompetitive in 2005, & why F1 teams were in such disarray in 2007, when tyres once more failed the "magic ratio" criterion.

Incidentally, & to bring the debate up to date, if you were watching the broadcast of FP3 today, you may have heard that MS complained that the option tyres "lacked balance" compared with the inters. My "one eyed" logic can explain that complaint perfectly....
Dave ,your comments are gold to me ,no doubt about it .even though I´will not have the pleasure of using this new input to make cars quicker as things stand currently.. :(

ubrben
ubrben
29
Joined: 28 Feb 2009, 22:31

Re: How can teams resolve tyre issues?

Post

"I think the characteristic we have on the front tyre at the moment is quite unusual, in the way because of the construction and choice of compounds, you put a load into it and it doesn't give more grip – it just flat lines, and that isn't very common for a tyre," Brawn added.
Interesting that Brawn's making excuses for Schumy again.

By the sounds of it it's not so much a narrow peak in Fy vs. SA, but high load sensitivity.

I've had comments like this "I load it more and it just gives up and flat slides" giving them a tyre that had less drop off of cornering stiffness vs. vertical load improved things.

Or alternatively, the tyres are fine and MS is just past it... :-)

Ben

DaveW
DaveW
239
Joined: 14 Apr 2009, 12:27

Re: How can teams resolve tyre issues?

Post

I found it interesting too, especially this:
"I think it was a response from the FIA to encourage Bridgestone to make tyres with the weight more rearward..."
Ultra-light front tyres, perhaps, or tyres to work with a more rearward load distribution?

"He who is gentle with his front tyres isn't competitive" appears to be a common theme across several teams, particularly during qualifying...

marcush.
marcush.
159
Joined: 09 Mar 2004, 16:55

Re: How can teams resolve tyre issues?

Post

DaveW wrote:I found it interesting too, especially this:
"I think it was a response from the FIA to encourage Bridgestone to make tyres with the weight more rearward..."
Ultra-light front tyres, perhaps, or tyres to work with a more rearward load distribution?

"He who is gentle with his front tyres isn't competitive" appears to be a common theme across several teams, particularly during qualifying...
so who are the boys struggling with these front tyres?

Massa
Schumacher
Button

seem to me the ones who suffer most.

Interestingly Schumacher was the ultra agressive front tyre use guy ,wasn´t heß
whereas the two others seem to be more the gentle men ?

So is it all simply cannot find the performance envelope ,as a lack of their own sensivity?

Makes me wonder about Sutil who cannot tell a supersoft from a hard tire on the same car...but does not too bad .maybe they are hunting something that is a fata morgana?

ubrben
ubrben
29
Joined: 28 Feb 2009, 22:31

Re: How can teams resolve tyre issues?

Post

If Button really struggling? I think he's doing better than most expected vs. Hamilton.

Massa is returning from his accident and Schumacher's struggling, which surely should lead to some questions about Massa. Maybe we thought he was better because he was beating Schumacher - but had his decline started before his retirement?

You can invent reasons why any driver's struggling. But Brawn's excuse for Schumy doesn't fit for Button who is allegedly smoother, etc, etc.

Ben