05-22-2017, 12:40 PM | #15 | ||
Drives: '19 RivrsdBlu 1LE ('17 1LE HB sold) Join Date: Nov 2016
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Quote:
I read mixed reviews about the cold/hot pressures on them. On Camaro forums someone mentioned " On the Trofeos, w/negative camber maxed out, I find the optimal hot tire pressure to be 32 psi. 33 is tolerable, and once I get past that the tires start to feel a touch greasy at the limit. This has been verified at track events by a tire professional, measuring temps across the tread and correlating that to tire pressures." My close friend (X25) who had a Gen 5 1LE with Z28 conversion also mentioned that when he was running these tires. In order to see 32-33 psi hot, I need to be able to do 25-26 psi COLD which I am trying to avoid at the moment. It is impossible to see 32-33 hot PSI with my car as I pass those pressures without even finishing the first lap Car certainly begs for more camber, and the camber is a must IMO since we don't have double wishbones to maintain the negative camber and Pirelli advises -3.0 (just like the Hoosiers) it may be because of the sidewall design. Although, toe out upfront will affect the steering wheel for a sharper turn in, it won't have the similar effects with the camber. Aggressive toe out will also reduce the tirelife more than the camber since I am driving to events not towing at the moment It sounds like Trofeo R would be a better match for a stiffer suspension (like Multimatics on the Z28) and/or wider wheels to stretch them. Taken directly from Pirelli's website: Quote:
Enough of high jacking I guess lol, we can talk about it in more detail in PMs
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05-22-2017, 12:48 PM | #16 |
Drives: 2020 SS 1LE (previous: 2017 SS 1LE) Join Date: Mar 2012
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Agree with your last 2 statements
But staying on the subject of "alignment", nobody is calling for "an aggressive toe out". Just a slight out vs zero that's all. Ya know you'll wear out those tires much faster on a track vs driving to/from no matter the rest |
05-22-2017, 12:50 PM | #17 |
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true but using small amount of toe will have smaller effects also, anyhow I just added the Pirelli's comments on Trofeo Rs
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05-22-2017, 12:59 PM | #18 |
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Good stuff! But toe (in/out) is supposed to be SMALL, very SMALL "More" doesn't mean "better" - to the contrary - it can affect the handling to a very unpredictable level. So "little" is GOOD Ok I am running away now lol
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05-22-2017, 01:16 PM | #19 |
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"On the track, I like to bleed to 38 all round hot. The Trofeo R sidewall feels much softer than other cup tires, hence the cushier ride, but this also leads to faster heating on the track when they are under-inflated. At 34 hot, they can get greasy with 12 minutes of very hard driving. 38 keeps them a bit cooler for a longer period of time.
And ditto Moggy about the thicker inner and outer shoulders. This design makes them last much longer for both DD and on the track. 2014 R8 5.2 Coupe S-Tronic VF750 supercharged Ceramic brakes, Ibis White , Carbon fiber, O.Z. Ultraleggera racing wheels 2014 Tesla Model S P85D(L+), Silver, Black leather, 21" wheels, Autopilot, Ludicrous+ is an understatement with 0-60 @ 2.28s 2012 Tesla Model S Signature Performance #905, Pearl White, 19" wheels (gone) 2011 R8 5.2 FSI, R-Tronic, Coupe, Ibis White, Carbon fiber sideblade, APR 93 tune (gone) Hidden Content " border="0" />" From an R8 forum. Keep in mind, if you start soft sidewall tires too soft they will overheat very quickly because of flexing. It is counter intuitive, but they will perform better if you start them too high then bleed down. But that requires pitting after 3-4 laps and can be a PITA. Obviously no such issues with NT01 as their sidewalls are hard as rock PS Ok really running away now lol! |
05-22-2017, 01:25 PM | #20 | |
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Quote:
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05-22-2017, 01:48 PM | #21 |
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The R8 guy starts them above his target 38 hot, comes in after 2-3 laps and bleeds down to 38 hot.
Seems to work for him. No first hand exerience here. But might be worth trying. One thing is for certain: a soft sidewall with insufficient pressure on a heavy car will always overheat the tire. And once it does, they'll be gone for a while. It is possible that starting them at 28 is way too low. NB I used to start NT01s at 28 on my 3100lb car. But interestingly enough, I had to start R1s higher (31) to arrive at and then stay at a sweet spot. Even though they too have very stiff sidewall. |
05-23-2017, 02:55 PM | #22 | |
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Quote:
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05-23-2017, 03:53 PM | #23 | |
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Quote:
Even for their slicks, Pirelli recommends higher pressures for heavier cars. Don't know how much the R8 knows or not. He specifically said running them higher made them last longer stints. But that's often a challenge with faceless Internet opinions. Unless they match our own of course, in which case they are "expert" opinions lol |
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