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  #41  
Old 11-28-2019, 04:20 PM
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Those two forums I cited are national, with a lot more members than Dorkiphus. Just throwing out additional places to obtain/ compare information from.

Not uncommon for a particular tire to work well on some models, and stink on others. It has a lot to do with the way the various designs withstand different directions of force and abrasions, how much pressure will increase on a rear-engine vs mid-engine, amount of camber and toe, driving styles, etc. (i.e., a crap-load of variables).
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  #42  
Old 11-28-2019, 04:53 PM
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OTOH, if I am carrying more speed into the corners, now I have to figure out where I am losing time. I don't have any old data but I have old videos. I'm going to have to figure out how to watch them side-by-side with the newer one.
I opened an old video with comparable time and my latest in Quicktime, resized the windows, placed one above the other and stepped through them. It's traffic!

I didn't believe it but I was carrying as much as 15mph more through the corners but losing what I gained in the straights because of traffic.

I wonder what I'll be able to do with new tires on an open track. Can't wait for next year.
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  #43  
Old 11-28-2019, 05:16 PM
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Good deal!
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  #44  
Old 11-29-2019, 02:12 PM
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Probably best to ask for recommendations/ experiences around in the Cayman or track section of RennLisp or Pelican.
I couldn't find Pelican but I found a site called Planet-9 as well as Rennlist. It appears there is a sort of mixed view on AD08R vs. RE-71R tires. Some prefer one and some the other. From what I read it appears the RE-71R may be slightly quicker but, strangely, is subject to more edge wear than the AD08R. I have no idea why that should be or even if it is true. It might really depend on the drivers.

The consensus was that both tires are as quick as the Cup 2s, which surprised me since Cup 2s are more track oriented.

It was noted by somebody who drives at COTA in the summer that the RE-71Rs are more heat sensitive but it gets really hot there. However, several posts mentioned that the RE-71Rs tend to fall off slightly after a few hot laps and it is necessary to run a cool-down lap during longer sessions to revive them. I'm not sure that is really an issue for a typical 20-25 minute session in the north-east that might run only 8-12 laps depending on the track.

There is the common complaint that both tires wear out pretty quickly, but I don't really know what that means either. My current tires wore out quickly but still had a lot of tread. I would be happy with something that lasted as long but wore more uniformly, in other words had a wider contact patch!

Being directional tires the subject came up about rotation and several posters said either tire was fine running backwards on a dry track. My guess is the same would apply on a damp track or any situation where you don't have to actually squeegee water.

In the end it appears there may not be a lot of difference between the two tires. It may just boil down to cost and availability. Right now at Tire Rack the AD08R is a whopping $16.50 cheaper than the RE-71R for a set of four but the RE-71R supply is higher, pretty much a wash.

Comments?
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  #45  
Old 11-29-2019, 03:25 PM
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I don't know those lists. I only got on this one because of Lara and I've found the Porsche drivers seem to know what they're talking about. For example, apparently RE-71Rs work well on Caymans even if they are questionable on other cars. That's useful to know.
Rob,

I think you have some good information in this thread but if you care to jump down the rabbit hole here are two Rennlist forums:


https://rennlist.com/forums/porsche-...26/?styleid=25

https://rennlist.com/forums/racing-a...tion-forum-65/
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  #46  
Old 11-29-2019, 03:54 PM
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Rob,

I think you have some good information in this thread but if you care to jump down the rabbit hole here are two Rennlist forums:


https://rennlist.com/forums/porsche-...26/?styleid=25

https://rennlist.com/forums/racing-a...tion-forum-65/
Thanks. I checked them out. No new information except one poster thinks the AD08Rs are prone to spin. I guess he means they release quickly if you push them over the limit. I know the closer you get to a pure slick the less there is at the limit but I don't know how this compares to the RE-71R. Very confusing.
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  #47  
Old 11-29-2019, 04:23 PM
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Thanks. I checked them out. No new information except one poster thinks the AD08Rs are prone to spin. I guess he means they release quickly if you push them over the limit. I know the closer you get to a pure slick the less there is at the limit but I don't know how this compares to the RE-71R. Very confusing.
We’ll consult the all knowing Paul at Radial Tire. Most of us don’t use street tires on track.
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  #48  
Old 11-29-2019, 08:31 PM
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Sounds like someone loves data. You have plenty. Any tire subjected track use will wear quickly. The softer the compound, the more quickly.

I prefer hard wearing tires cause I don't like spending money.Others prefer softer tires. Softer tends to go off sooner. Even in the northeast, tires get hot enough to go off, especially if the driver overuses the available components.

You have an idea that very sticky street tires and r comps will give you 5-15 track days. The street driving to or from is negligible compared to the track use.

Without major changes (LCA) you will not get enough negative camber to not wear out the outside shoulders. You can mitigate wear by flipping left to right as well as flipping on the rim.

Sounds like you are driving quicker based on your own data. Next step could be improvements to the car (suspension, tires) to further the fun.

Is that r comps I smell under the Christmas tree?
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  #49  
Old 11-30-2019, 10:06 AM
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I know you said you can't flip them on the rims (take off and remount opposite and rebalance) I get it done locally at a good tyre place and does not cost much end of day they are worn pretty evenly if done at the right wear time. pretty much double the current life.
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  #50  
Old 11-30-2019, 11:59 AM
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I run RE-71Rs on my GT4 and they work great. In my experience, they don't get greasy unless you let the pressures get too high, regardless of temp. I try to run mine around 33-34 psi; the tires are fine unless the pressure gets to 36 or above. I often have my best laps near the end of a session.

However, until you do something with your car (stiffer sways, split LCAs, etc.), you're going to continue to have outer-edge wear, regardless of what tire you run.
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