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Old 3 May 2017, 01:39 (Ref:3730659)   #26
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Dunlop To Test Supercar Control Tyres... At Bathurst!!!



Let the tyres pop at 300 km/h instead on 280 km/h.

Smart

Cars can still crash and hurt stuff on test days..
Mr Phelps' use of Tautograms is a little cringe worthy... what am I saying most of his stuff is already cringe worthy...
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Old 3 May 2017, 01:42 (Ref:3730660)   #27
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Mr Phelps' use of Tautograms is a little cringe worthy... what am I saying most of his stuff is already cringe worthy...
there is thread for discussion on James, go and give your opinion there.

Any on topic comment?
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Old 3 May 2017, 02:03 (Ref:3730661)   #28
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Dunlop To Test Supercar Control Tyres... At Bathurst!!!



Let the tyres pop at 300 km/h instead on 280 km/h.

Smart

Cars can still crash and hurt stuff on test days..
Would you rather that they rock up there for the race and just hope for the best?

After PI it seems critical to me to do some testing at Bathurst. The teams normally stand their wheels up much more at Bathurst to make life easier for the tyres but to have a better understanding of limits will be important.

Good move to do the test - neither easy nor cheap at Bathurst with all the gates to close etc but as Dunlop and the teams work through the issues, seems logical and needed to do this test.
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Old 3 May 2017, 04:23 (Ref:3730666)   #29
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Would you rather that they rock up there for the race and just hope for the best?

After PI it seems critical to me to do some testing at Bathurst. The teams normally stand their wheels up much more at Bathurst to make life easier for the tyres but to have a better understanding of limits will be important.

Good move to do the test - neither easy nor cheap at Bathurst with all the gates to close etc but as Dunlop and the teams work through the issues, seems logical and needed to do this test.
Not doubting any of that.. but Phillip Island is easier to access in the first instance. And the source of 20-odd failures!

Would consider getting a tyre to work at PI to be more than a great start on a Bathurst tyre.

Can the tyre company get access to test at Bathurst anyway?

Doesnt seem to be another event running already before the B1000 they can just add a day to, like the BMW crowd did..

It requires government gazetting doesnt it, for a separate event. And approval from state & local government. And filling the support crew roster for officials & medical.

Or are we going to see this on Wednesday of Bathurst week

Why is it that Michelin or Pirelli can just pop up with their world GT tyre & just br on it, with no failures of note?
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Old 3 May 2017, 04:37 (Ref:3730668)   #30
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Why is it that Michelin or Pirelli can just pop up with their world GT tyre & just br on it, with no failures of note?
Seem to recall that one of the GT tyre suppliers had some issues at PI recently but can't remember which race meeting or which manufacturer.

To answer your question though would need a complex answer as tyres ain't simple. For example, GT tyres are wider, may not run anything like the same camber, are set up on the cars to get longer life (to keep pit stops short from a strategy standpoint) so less stress on the tyre, the cars are lighter and operate very differently in terms of roll stiffness, downforce etc. Plus on top of all that the tyre suppliers to GT3 have hundreds of cars running in various series and heaps of tracks all round the world so lots and lots of data to work with.

Dunlops for Supercar need to operate across a range of temperatures and a wide range of tracks and with the new construction the data is being collected from 28 or so cars. The testing of the tyres was reduced somewhat last year (in regards to PI) and so the development is still ongoing, made more intriguing by the teams ramping up the stress on the tyres this year with much higher camber angles.

Doing the test makes sense but it won't be easy as I mentioned as there'll be quite a few hoops to jump through.
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Old 3 May 2017, 05:14 (Ref:3730669)   #31
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Originally Posted by GTRMagic View Post
Not doubting any of that.. but Phillip Island is easier to access in the first instance. And the source of 20-odd failures!

Would consider getting a tyre to work at PI to be more than a great start on a Bathurst tyre.

Can the tyre company get access to test at Bathurst anyway?

Doesnt seem to be another event running already before the B1000 they can just add a day to, like the BMW crowd did..

It requires government gazetting doesnt it, for a separate event. And approval from state & local government. And filling the support crew roster for officials & medical.

Or are we going to see this on Wednesday of Bathurst week

Why is it that Michelin or Pirelli can just pop up with their world GT tyre & just br on it, with no failures of note?
Of course in the late eighties and early nineties the Tooheys 1000 launch day at Bathurst doubled as a tyre test.

Although it didn't always work out for some teams.
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Old 3 May 2017, 05:19 (Ref:3730670)   #32
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there is thread for discussion on James, go and give your opinion there.

Any on topic comment?
Your post is off topic.

The article seems pretty non-committal on anything, dates included. Weird how it quotes Warburton but he hasnt mentioned any sort of tyre day at Bathurst.

Wonder if this test will be open to the public...?
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Old 3 May 2017, 07:41 (Ref:3730700)   #33
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Is part of the reason for the tyre failures not partly caused by the need these days of chasing a tyre that wears out quicker in races?
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Old 3 May 2017, 08:33 (Ref:3730713)   #34
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LARKO GIVES HIS EXPLANATION ON THE TYRE BLOWOUT
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Old 3 May 2017, 08:52 (Ref:3730719)   #35
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Of course in the late eighties and early nineties the Tooheys 1000 launch day at Bathurst doubled as a tyre test.

Although it didn't always work out for some teams.
It seemed to play out that way for Dunlop, the DJR & Perkins cars testing lots of new stuff...
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Old 3 May 2017, 09:40 (Ref:3730725)   #36
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It seemed to play out that way for Dunlop, the DJR & Perkins cars testing lots of new stuff...
Yes, but not for Brock and Bridgestone.
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Old 4 May 2017, 01:22 (Ref:3730880)   #37
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A Bathurst Blowout?
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Old 4 May 2017, 01:28 (Ref:3730881)   #38
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I think this article is probably better, looks like the Triple M one is a sensationalist summary of this

Lowndes: No need for Bathurst tyre change
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Old 4 May 2017, 04:27 (Ref:3730894)   #39
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there is thread for discussion on James, go and give your opinion there.
Oh sorry, I missed the memo where you were made Moderator.

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Any on topic comment?
You feel you need to make a post calling that out, when your post is not on topic either. Seems logical to me! My post was a comment based on the link in the prior post. If that's not on topic, I don't know what is.
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Old 4 May 2017, 04:44 (Ref:3730897)   #40
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Might be interesting to see how the "softs" go on the generally rough Barbagallo circuit.
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Old 4 May 2017, 05:10 (Ref:3730901)   #41
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Oh sorry, I missed the memo where you were made Moderator.

You feel you need to make a post calling that out, when your post is not on topic either. Seems logical to me! My post was a comment based on the link in the prior post. If that's not on topic, I don't know what is.
Any on topic comment?
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Old 4 May 2017, 08:03 (Ref:3730928)   #42
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Any on topic comment?
Have you?
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Old 4 May 2017, 10:58 (Ref:3730958)   #43
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Have you?
yes. quite a few

Looking forward to hearing back from Dunlop, But i suspect the result will be regulation on camber or increased tyre pressures.

Larkos summary seemed to explaing what was going on why the new tyre was different and camber changes happened
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Old 5 May 2017, 02:28 (Ref:3731110)   #44
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Good work, let the moderators moderate, and you stick to what it is you do...
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Old 5 May 2017, 03:18 (Ref:3731115)   #45
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Good work, let the moderators moderate, and you stick to what it is you do...
good idea. You should consider taking your own advice

Any more thoughts on the Dunlop tyres?

Rusty saying they should test at PI, if they work at PI then they will work at Bathurst
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Old 5 May 2017, 03:58 (Ref:3731117)   #46
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And people wonder why threats get made...

So, Barbagallo as a highly abrasive circuit, but relatively low speed, is tyre wear anywhere near that at the high speed but relatively normal abrasiveness of PI?
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Old 5 May 2017, 14:43 (Ref:3731244)   #47
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So, Barbagallo as a highly abrasive circuit, but relatively low speed, is tyre wear anywhere near that at the high speed but relatively normal abrasiveness of PI?
My understanding (which may not necessarily be correct) is that tyre WEAR at Barbagallo would be greater than PI. Tyre FAILURE, as opposed to wear, was high at Phillip Island due to excessive stresses on the tyres internal construction. I haven't seen any references to tread wear on the PI tyres so have no idea what sort of conventional wear they had - the treads may still have been OK?

What disappoints me is that I remember reading before Clipsal that Dunlop were recommending reducing the amount of negative camber, but if anything it seems the teams pushed the other way. Then the majority of fans seem to want Dunlop's head on the block?

If your engine builder said we recommend you don't go over 7500rpm, but you say nah, we'll push it to 8000rpm, do you blame the engine builder if it goes pop?
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Old 5 May 2017, 23:39 (Ref:3731365)   #48
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If your engine builder said we recommend you don't go over 7500rpm, but you say nah, we'll push it to 8000rpm, do you blame the engine builder if it goes pop?
I imagine they can probably handle 9000rpm actually, NASCAR run that, just the cam profiles will not be optimised for such rpm at the moment. Racing is all about pushing the limit and ignoring manufacturer specifications, but I agree they all must now strictly adhere to camber and pressure requirements.

Anyway, I am still looking to Dunlop for my road car tyres. They are the only ones who offer a 91Y spec that is 2kg lighter per tyre than the common 94W spec (have to import it from Europe though). They perform near the top of all the tyre tests, on par or better than the Michelins, Pirellis and Continentals, and best in the wet.

I'm considering these, even though stung by sister tyre Goodyear before. Also, excellent in the tyre tests and indeed excellent when new (as tested by the tyre tests), but seems to have lost grip as it has worn and worn fairly quick for a road tyre.
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Old 8 May 2017, 01:22 (Ref:3732093)   #49
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I'm considering these, even though stung by sister tyre Goodyear before. Also, excellent in the tyre tests and indeed excellent when new (as tested by the tyre tests), but seems to have lost grip as it has worn and worn fairly quick for a road tyre.
Power down tractions issues from the pilot, maybe?
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Old 10 May 2017, 06:54 (Ref:3732591)   #50
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AusGT Allow Tyre Warmers

But read the justification...

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“We are allowing the tyre warming cupboards at the endurance rounds following a review of the circuits we are competing at and in consultation with Pirelli,” said category manager Ken Collier.

“The latest GT3 cars are developing much more aerodynamic down force than in previous cars and this results in higher corner speeds and greater load on the tyre.

“Also, there have been occurrences of tyre damage through low pressures and/or excessive camber set-up which is a problem in qualifying sessions.
“Tyre warming is permitted in many GT races in Europe and it has been found to extend tyre life and assist in reducing the occurrence of set-up related damage to the tyres.
Is this a solution?
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