Showing posts with label RE11. Show all posts
Showing posts with label RE11. Show all posts

Tuesday, March 3, 2009

"Slalom of the Pacific" ~ PSCC Practice & Champ Event ~ El Toro, CA

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What a glorious day for the first day in March and this is our first day out to race with the new Bridgestone RE-11 tires. In case you haven't been paying attention, the RE-11 replaces the old RE-01R from 2008 and is now officially available.

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Given that we were scheduled to run in the afternoon and with the delays that had taken place, both of us spent a lot of time just standing around, like this:
Stephen and Jason

The fifth run group didn't start running until around 3:45PM. Rather late for normal running with a sixth group still to go before the sun sets.

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Today, we drove the 205/50/15. It was a good course for this tire. Many fast sections, some transitions and only 3 slow turnarounds. If you run a Civic like ours, you will notice that the car works harder coming out of the low speed turnarounds - not really any different than the Toyo drivers that may choose to run the 225.

Bridgestone RE-11205 vs 195 RE-11

On this grippy asphalt surface, this tire feels like it has almost R compound levels of grip - something that I know I'm not used to being in a street tire class and I will have to make a conscious effort to recalibrate my butt - and my nerve for higher corner entry speeds.

The Civic has been suffering from some braking problems lately (we seized a caliper last week and it sent me on a little loop de loo). However, the tire squeels louder than the RE-01R did (another area to recalibrate), but it does slow down better than the old tire. It just sounds like it doesn't.

The course had a big right handed sweeper that was wide and I'd slow down to turn in and find out that I had slowed down too much. I'm beginning to think that I should have just attacked the turn without hitting the brakes. If I had just tried it... Being familiar with this site, both of us agree that there is no way we would have been able to take this turn at the same speed on the RE-01R.

Being in a two driver car, we were concerned about heat (today was in the mid-70's and sunny). The RE-01R heated up and started to get greasy very quickly. This new tire is so much better in this aspect. It will heat up during the run, but it will also have cooled off significantly by the time the next driver was up to drive. This is a huge improvement from the RE-01R. We didn't start watering until the end of the 2nd runs for both drivers.

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The tire is also showing signs of comparable durability to the RE-01R. Time will tell just how good these tires are as we get more seat time on these tires. Given what we have just seen, my expectation is very high and this tire is definitely better than the outgoing tire.

As for us, we need to work on going faster.

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Bridgestone Portenza RE-11 Review Part 2 ~ Revolution Talk

Part 2 will cover the height differences between the RE-11 195/50/15 and the 205/50/15.

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Documented Diameters of the tires:

195/50/15 = 22.7"
205/50/15 = 23.1"
Difference = 0.400

Measured Diameters of tires:
195/50/15 (shaved 5/32, with 49 runs) = 22.250
205/50/15 (shaved 5/32, with 20 runs) = 22.625
Difference = 0.375

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Speeds charted against RPM with measured diameter:
Summary: Along the RPM range there is an average of 1 mph difference between the 2 tires

When comparing corner exit there is definitely a difference one can feel on acceleration, course dependent decision will be had to made to maximize use of tires diameter.

Note: Documented R1R Diameters
195/50/15 = 22.8
205/50/15 = 23.0
225/45/15 = 23.0

Bridgestone Portenza RE-11 Review Part 1 ~ Tire Wear

So the RE-11 has now been released and there has been lots of buzz about its arrival we are very excited to report our findings here. We will be covering it in separate parts to be able to present data in an organized fashion and also as an archive for people to utilize when trying to choose their future tire.

Our first highlight will be of tire wear, here is the data.

Overall our experience with both the 205 and 195 have been very good. Definitely better then the re01-R's but we shall add more on that later

I will deal with the issues of wear in this post.

Lets start with some car data.

1989 Allstar ST Civic

Drivers: Stephen Yeoh and Jason Flores

Weight = 2005lbs

Front Camber = 3.2* Rear Camber = 2.5* ZERO ~ Toe front and back

Pressures used: same as re01r pressures 34F / 31R

Here are our 195 RE-11 with 49 runs on them with them mostly on an abrasive asphalt surface with majority of the courses being 40 sec and some being as long as 70sec. Tires started at 5/32 and after 50ish runs they are 4/32-3/32 tread depth and still feeling great!!!

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Here are our 205 RE-11 with 20 runs on them from just the past weekend again on an abrasive asphalt surface with the course being between 85-90 seconds over 2 days. Tires also started at 5/32 and are still looking at 5/32 or just a bit less.

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