Tires...

Jon62 · #1 06-09-2009, 04:30 PM

Currently running street Kumho Ecsta XS tires on my Track day car and loving them...However...Looking ahead...

At what point do you start thinking about the next level, I guess R comp tires. Probably a very subjective question, but curious non the less...

Here is a recent data trace with a reference lap included from Mike. Saw in another thread discussions on cornering G's and braking G's so included those...

I see at least 6 more seconds to get out of the current setup with learning, car control skills and track time...

Some of those seconds can be had with not easing off the gas as car confidence grows...( having to drive it home also comes into play...

)

p.s. Can these pictures be embeded in the message without the attachment? Seen others do it, but haven't figured it out yet...

Warpedcow · #2 06-09-2009, 05:32 PM

Quote:

Originally Posted by Jon62

p.s. Can these pictures be embeded in the message without the attachment? Seen others do it, but haven't figured it out yet...

You can upload the images into the Track Picture Album and then embed the image using the URL of the image.

Example:
Here is a link to the example image in one of my albums: http://www.trackpedia.com/photogarag...php/photo/2483
Here is the image embedded in this post:

jstecher · #3 06-09-2009, 09:52 PM

I'd say hammer out this year and get within a few percentage points of Mike and then move on up.

kbrew8991 · #4 06-09-2009, 11:20 PM

6 secs is a big gap, imo too big to add another factor like r-comps in the mix. Stay on streets for a while longer. My $0.02

TailWagger · #5 06-11-2009, 07:08 PM

Two points. Point 1. Either those cars are the fastest accelerating, worst braking machines ever made -or- your Long. G is upside down. Freaked me out when I first looked at.

Second more to the point point. To agree with the others. Given the data, theres no need for you to move up to r-comps yet. The G-Sum data tells you this pretty clearly. If you look at Mikes data, you see a nice empty triangle. He's using all available traction on the friction circle for the full lap. If you examine yours, there are a lot of data points inside the triangle, which says that you not using all that you have available. Going to Rs will undoubtedly quicken your lap times, but equally slow your progress as a driver. When you can make the inside of the triangle look nearly empty, you know you've graduated. Then buy the new shoes.

Skeen · #6 06-11-2009, 10:34 PM

Long G is correct. Up on the friction circle is usually braking...

TailWagger · #7 06-12-2009, 07:23 PM

Quote:

Originally Posted by Skeen

Long G is correct. Up on the friction circle is usually braking...

Friction circle yes, Graphs no. Certainly not on my graphs, nor on any of the other systems I've played with nor in the data books I've perused. Braking is expressed as negative G, acceleration positive G, whereas the graph presented shows +0.8G and -.2G Long maxs which seems very weird to me. Though admittedly its expressed as long acceleration... thats likely the inversion point.

ProCoach · #8 06-17-2009, 10:53 PM

Quote:

Originally Posted by TailWagger

Certainly not on my graphs, nor on any of the other systems I've played with nor in the data books I've perused. Braking is expressed as negative G, acceleration positive G

Traqmate is backwards from industry (AIM, Stack, RacePak, Race Technology, MoTeC and SAE) standard as far as logitudinal g axis display is concerned. You can swap the axis in the software easily if you can't get used to it. The values are what are important, but yes, it's confusing.

ProCoach · #9 06-17-2009, 11:03 PM

Interesting comparo. You can fix alot by not only maintaining full throttle a little longer but instead paying attention to and willing your foot to come off the brakes just a trace sooner than you are comfortable.

Your stepped deceleration, paralleling Mike's through T4 and into T5, shows that you have the right idea and just need to develop the comfort level to do so at a slightly higher rate of speed. The fact that your SHAPE of the velocity versus distance trace parallel's Mike's most of the way indicates you CAN do it. The greatest variation defines where you start working on reducing the gap first.

I'd get the R-compound tires, but then again, I like the best tools at my disposal. Often, that can give you enough confidence boost that you can get OFF the brake sooner and raise your vMin a few tenths or a mile an hour each corner, then VOILA, you have have that three of four seconds difference improvement, maybe more. Less than half comes from the tire, more than half comes from your improved confidence and comfort level.

Would really need to see the time gap versus distance to divine more. Remember, it's mostly in your mind. Mike's proven that the car can do it! Of course, being in the left seat a third of the year for several years is invaluable!

Jon62 · #10 06-18-2009, 06:46 PM

http://www.trackpedia.com/photogarag...99/ppuser/2695

Tried to upload it to the picture gallery, added a link to the file also. I think this is what you were looking for ProCoach...

As you mentioned, knowing what the car "can do" now, it made Sundays sessions much faster.

I also held the speed at 90 along the back straight going into the kink. Mike was full throttle all the way.

Apparently I was shifting slower and we were working on a throttle rotation for the car in the carousel, turns 5, 6 and 7 sequence...Even dropped a gear shift going into 5 and 8 to work on some specifics, later in the day...

I drive the car to and from the track, so that is always in the back of my mind...

Heading to CMP this weekend with Tarheels, so can practice some more of what Mike left me to work on...

Thanks to all for the input...