HPDE experiments, results and observations

[rhyary]

G-Sum comparison between 1:35.7 R7 and FFI500. The rears were not the same, but I think the main diff is the front.
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[rhyary]

Adding steering angle to the Measures Graph shows the superiority of the R7.

You can see that the FFI500 (blue) takes more steering angle to generate less g-sum.

This is way playing with the throttle and steering angle helped rather that a smoother input on the R7:
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[rhyary]

Wear was good.
but look at the inside of the FFI500

[tsk94]

Originally Posted by rhyary

Wear was good.
but look at the inside of the FFI500

I might have missed it, but what are your overall impressions and thoughts for the FFI500 for a budget track tire?

[rhyary]

Originally Posted by tsk94

I might have missed it, but what are your overall impressions and thoughts for the FFI500 for a budget track tire?

This is only for track, no idea for road/daily usage.

Cheap $215 for 275/30/19 on tire rack
Loud on the turn
Good wear (must be hard rubber)
Predictable. No issue about wondering what it is going to do
About 2 sec slower than MP4S, ADOR8, R888R

However, all tires mentioned here were in a different suspension setup.

Next trackday I will be on front MPScup2 265/35/19 and same setup. We will see the diff then between 180 track tire and general 340 performance tire.

[Grillpt]

Was this the first time out on that suspension? U said all other tires were on a different setup..

I'd be seriously worried if i saw that kind of devastation to one of my tires. That's scary man! I wouldn't just brush that off.. Tires don't chunk on the sidewall from heat

[Grillpt]

Looking at the pictures again, looks like the inside is cracked almost all the way around. I've never seen a tire destroy itself that way, but it's clear u overdrove the ish out of it

Honestly makes me angry as an instructor

[Bartledoo]

"Wear was good"?!!!!! Doesn't seem like it!

[rhyary]

Originally Posted by Grillpt

Was this the first time out on that suspension? U said all other tires were on a different setup..

I'd be seriously worried if i saw that kind of devastation to one of my tires. That's scary man! I wouldn't just brush that off.. Tires don't chunk on the sidewall from heat

i have documented this year changes already

[rhyary]

Originally Posted by Grillpt

Looking at the pictures again, looks like the inside is cracked almost all the way around. I've never seen a tire destroy itself that way, but it's clear u overdrove the ish out of it

Honestly makes me angry as an instructor

I like to get my money worth out of my tires

[rhyary]

Originally Posted by Bartledoo

"Wear was good"?!!!!! Doesn't seem like it!

Meaning I did not cord the outside.
I only saw the inside when I got home and took the wheels off.

This was a 2015 tire. perhaps it was too old

[Kelse92]

Originally Posted by rhyary

Meaning I did not cord the outside.
I only saw the inside when I got home and took the wheels off.

This was a 2015 tire. perhaps it was too old

Ohh yeah, that'll do it, old tire probably dry-rotted some. Plus, maybe a little rubbing going on with the spring perch?
Tread does look good though, I have heard they do get pretty decent wear. Bummer on the sidewalls

[rhyary]

Originally Posted by Kelse92

Ohh yeah, that'll do it, old tire probably dry-rotted some. Plus, maybe a little rubbing going on with the spring perch?
Tread does look good though, I have heard they do get pretty decent wear. Bummer on the sidewalls

No rubbing.
Tires did its job. I got 1:40.x, 13x20min sessions at full speed, no traffic. and got home to enjoy another day.

Really can't ask for more.

There was no visible dry rot, but then again, look at the picture :-)

[WhiteM3EMC]

I ran 275 square FFI500 on my last car, and I was extremely happy with them. Very cheap, great wear, decent grip for the price point and wear. I'm on faster tires in the M3 now, but I thought the FFI500 was a great dual duty tire. Zero inner sidewall issues with mine, but they were newer.

[rhyary]

Originally Posted by WhiteM3EMC

I ran 275 square FFI500 on my last car, and I was extremely happy with them. Very cheap, great wear, decent grip for the price point and wear. I'm on faster tires in the M3 now, but I thought the FFI500 was a great dual duty tire. Zero inner sidewall issues with mine, but they were newer.

Good to know.
I have another set for the front and plan to run them later in the year

[WhiteM3EMC]

Originally Posted by rhyary

Good to know.
I have another set for the front and plan to run them later in the year

Of note, this was on a 4500lb Dodge Charger (yeah I know, I had to have a boating license to operate it on track)

With stock camber and that much weight, the lack of outer shoulder wear was fantastic. After one session, they would get nice and tacky and pick up dirt and pebbles in the paddock. Within 10 road miles they would smooth back over.

I would have zero hesitation of running them again for lapping if I wasn't trying to be competitive in TT at some point.

[rhyary]

Originally Posted by WhiteM3EMC

Of note, this was on a 4500lb Dodge Charger (yeah I know, I had to have a boating license to operate it on track)

With stock camber and that much weight, the lack of outer shoulder wear was fantastic. After one session, they would get nice and tacky and pick up dirt and pebbles in the paddock. Within 10 road miles they would smooth back over.

I would have zero hesitation of running them again for lapping if I wasn't trying to be competitive in TT at some point.

You are making good point and I second your opinion. 1:40 at NYST is a respectable time for a 3400Lbs car. The hard rubber on the FFI500 wear out very well and I was able to finish two days which I was not able to do on many other tires.

So this is the point, if you are NOT trying to do your best time, these are good, inexpensive option.

The fact that you did not eat up the outside of your sidewall and were on a stock camber is related to traction. If the tire can't generate enough grip, it will slide before it goes over. It also related to your pace. a 275/30/19 MPS4S did great using -2.5 camber on 1:42-1:44 lap time. Wear was even and all looked honky dory. Totally different wear pattern on 1:38. The outside was destroyed. The MP4S has enough grip to role over on the side wall.

As a reference, my time in Hoosier R7 is 1:35.7 and that is yet another level of grip

[WhiteM3EMC]

Originally Posted by rhyary

You are making good point and I second your opinion. 1:40 at NYST is a respectable time for a 3400Lbs car. The hard rubber on the FFI500 wear out very well and I was able to finish two days which I was not able to do on many other tires.

So this is the point, if you are NOT trying to do your best time, these are good, inexpensive option.

The fact that you did not eat up the outside of your sidewall and were on a stock camber is related to traction. If the tire can't generate enough grip, it will slide before it goes over. It also related to your pace. a 275/30/19 MPS4S did great using -2.5 camber on 1:42-1:44 lap time. Wear was even and all looked honky dory. Totally different wear pattern on 1:38. The outside was destroyed. The MP4S has enough grip to role over on the side wall.

As a reference, my time in Hoosier R7 is 1:35.7 and that is yet another level of grip

Good point. With that much weight, the car certainly liked to understeer. I was running good pace in the car but at the point where you're dragging 4500lbs around a track, you can only go so fast. My first time at the same track in the M3 on NT01s (with PFC front BBK, so a bit of a skewed result) I was 3 seconds faster. Weekend got cut short by some mechanical problems so I didn't get a chance to see if I could push that to 5 seconds or so gap.

[rhyary]

Beatiful day at NYST today.

Here is the 1:31 Corvette. He is going for the Viper record of 1:28.

According to the driver this is no excuse Corvette. If he does not do 1:28, he says it is on him.
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315 Hossies on the front. One can only dream...

[rhyary]

Beautiful GTR with R888R 285 front 315 rear
He says he is lucky to get one day on the fronts at NYST.
His best time is 1:37.

[rhyary]

We got GT2 RS, the new Corvette, R8, GT3, GT3 RS and bunch of exotics. This is going to be a fun day.

[WhiteM3EMC]

Originally Posted by rhyary

We got GT2 RS, the new Corvette, R8, GT3, GT3 RS and bunch of exotics. This is going to be a fun day.

Thats a gorgeous lineup!