SD BMWCCA HPDE at Chuckwalla - Mar. 29-30 2014

[aus]

Originally Posted by Ti-Jean

Video or it didn't happen

Here's mine (not my best but a good one!):

Any follow-up on why the tire came off the rim?
Damn scary.

[Ti-Jean]

Originally Posted by aus

Any follow-up on why the tire came off the rim?
Damn scary.

I had been fighting this wheel/tire since that set of tire went on these rims. I would inflate to 40psi, let sit overnight and check the next morning. Everything would be fine. I inflate to 26psi, go out on track, some time I come back and the pressure is 30-34psi but other times I come back and it is 16-18psi. Before this event, I had the tire unmounted and remounted to see if that would fix it. It didn't.

They are 3-pieces wheels so now I'm thinking that there is some kind of air leak at the seal under high Gs. I think the tire jumped the rim because the pressure got too low. I'm going to rebuilt the wheel and see if the problem disappear.

[aus]

Originally Posted by Ti-Jean

I had been fighting this wheel/tire since that set of tire went on these rims. I would inflate to 40psi, let sit overnight and check the next morning. Everything would be fine. I inflate to 26psi, go out on track, some time I come back and the pressure is 30-34psi but other times I come back and it is 16-18psi. Before this event, I had the tire unmounted and remounted to see if that would fix it. It didn't.

They are 3-pieces wheels so now I'm thinking that there is some kind of air leak at the seal under high Gs. I think the tire jumped the rim because the pressure got too low. I'm going to rebuilt the wheel and see if the problem disappear.

Fikse wheel?

Also, how did you bring another set of wheels in that go-cart? You said you switched wheels and went back out?

[skxf430]

change to a 1-piece wheel to simplify things.

[Ti-Jean]

Originally Posted by aus

Fikse wheel?

Also, how did you bring another set of wheels in that go-cart? You said you switched wheels and went back out?

Wheels are Kinesis K28

That go-cart needs a trailer and tow truck. Once you put your helmet and shoes in the car, there's no more space left!

I had 2 extra sets of tires in the truck bed

Originally Posted by skxf430

change to a 1-piece wheel to simplify things.

Too late now, 3-pieces is what I have. The good thing is it's easier to fix if I bend one. But the flip side is that you have to deal with little issues like air leaks.

[dapopa9]

Damn that was crazy the tire came off. Weird thing is I've seen that happen 3 times and all 3 have been GT3s at Chuckwalla. Luckily it came off on the slowest turn

[dapopa9]

Ti-jean - u run the TDs yet? How you like them compared to R6?

[Ti-Jean]

Originally Posted by dapopa9

Ti-jean - u run the TDs yet? How you like them compared to R6?

Ran a side-by-side test at Bottonwillow between TDs and R6s in same sizes (295/245). The TDs were 1-1.5s faster for me. The R6s are easier to slide around compared to the TDs. TDs are "choppy" once you get to edge of traction.

[OC3]

Originally Posted by dapopa9

Damn that was crazy the tire came off. Weird thing is I've seen that happen 3 times and all 3 have been GT3s at Chuckwalla. Luckily it came off on the slowest turn

hah, saw one last year & took picture & posted it.

[dapopa9]

Originally Posted by Ti-Jean

Ran a side-by-side test at Bottonwillow between TDs and R6s in same sizes (295/245). The TDs were 1-1.5s faster for me. The R6s are easier to slide around compared to the TDs. TDs are "choppy" once you get to edge of traction.

Good info!! One of the few times we get to see side by side comparisons of actual tire performance with same driver, car, day, and track.

[USCTrojanMan29]

Originally Posted by Ti-Jean

Ran a side-by-side test at Bottonwillow between TDs and R6s in same sizes (295/245). The TDs were 1-1.5s faster for me. The R6s are easier to slide around compared to the TDs. TDs are "choppy" once you get to edge of traction.

Why doesn't TD have any love for the guys who have cars with wide hips (that goes for Nitto too)??? What's interesting is that I ran a 2:02 CCW on NT01s/RA1s with an instructor and ran a 1:57 on R6s without an instructor. I do think part of the difference had to do with no going too crazy because of having an instructor in the car. So for me, the difference between R6s and NT01s/RA1s is about 3-4 sec.

[Ti-Jean]

Originally Posted by USCTrojanMan29

Why doesn't TD have any love for the guys who have cars with wide hips ....

295 is the widest available so doesn't work well for cars with wide hips.

Originally Posted by USCTrojanMan29

What's interesting is that I ran a 2:02 CCW on NT01s/RA1s with an instructor and ran a 1:57 on R6s without an instructor.

Did you run 1:57 on the same day, same direction? Different day and conditions can account for some differences, maybe 1-2sec. The BMWCCA week-end was a bit windy with some sand on the tracks in some sections.

[USCTrojanMan29]

Originally Posted by Ti-Jean

295 is the widest available so doesn't work well for cars with wide hips.



Did you run 1:57 on the same day, same direction? Different day and conditions can account for some differences, maybe 1-2sec. The BMWCCA week-end was a bit windy with some sand on the tracks in some sections.

That was back in early March with POC running CW (which I heard is 1+ seconds slower than CCW...). So maybe take another 1-2 seconds for conditions and difference is closer to ~2 seconds with R6s vs NT01/RA1s. I'd be curious what the TDs feel like on my car. Hell, I've heard that the 305/35/18 NT01s are on back order with no ETA so I'm glad I stocked up on the shaved RA1s.

[dapopa9]

Either of you run the A6s yet? I think I'm trying those next. Most of the Z06 guys run those I realized. Guess they are a bit faster than R6s even after they get greasy. I initially thought they were just for autocross but after talking to a few people I guess they are fine for HPDE or races shorter than 30 min.

[USCTrojanMan29]

Originally Posted by dapopa9

Either of you run the A6s yet? I think I'm trying those next. Most of the Z06 guys run those I realized. Guess they are a bit faster than R6s even after they get greasy. I initially thought they were just for autocross but after talking to a few people I guess they are fine for HPDE or races shorter than 30 min.

I might try those later on. I think that they should be fine for shorter 20-25 minute DE sessions.

[The HACK]

Originally Posted by admranger

though my C student in the Infinity was flat out working that car on Sunday - lookout B group in the next school

I was wondering who's the instructor in that car... Dude was BOOKING it. Probably would have been one of the fast guys even in B.

[tlp]

Originally Posted by The HACK

I was wondering who's the instructor in that car... Dude was BOOKING it. Probably would have been one of the fast guys even in B.

That was my boy Doug. He left a bunch humbled in his basically stock G35 with NT05's.

[Hujan]

Originally Posted by tlp

That was my boy Doug. He left a bunch humbled in his basically stock G35 with NT05's.

Stock?! Jeremy and I were sure it was modded. It was definitely quick! See also the white Camaro SS in D League.

[tlp]

Originally Posted by Hujan

Stock?! Jeremy and I were sure it was modded. It was definitely quick! See also the white Camaro SS in D League.

Ok, not bone stock but mild mods nevertheless and it's an Infinity after all

His mods:

Hotchis swaybars
Tein S tech springs and Tokico shocks
Front strut tower bar
UR crank pulley
Intake plenum spacer
350z intake tube
Motordyne cat back exhaust
Braided steel brake lines
Ferodo 2500 pads

[The HACK]

Originally Posted by tlp

That was my boy Doug. He left a bunch humbled in his basically stock G35 with NT05's.

Hope he had a good time and would come back for more!

[tlp]

Originally Posted by The HACK

Hope he had a good time and would come back for more!

He did and will .

The problem is that sometimes the events are far and few inbetween. The next local CCA event is at Buttonwillow for one day (Friday). I can't be bothered to drive there for a single day.

Now I'm forced to run around with PCA-SD and a bunch of P-Cars the week after next to get my Chuckwalla CCW fix again

[The HACK]

IMO, once the chapter(s) start seeing more participation the events will return. I was "made" during the golden years when the region would do 2 weekends at Buttonwillow (one hosted by San Diego, one hosted by Central Cal), one weekend at Las Vegas Motor Speedway, one weekend at Willow Springs, one weekend at Cal Speedway, one weekend at Laguna Seca, one weekend at Sears Point, and one weekend at Thunderhill. There used to be an event every 3-5 weeks if you sprinkle in a few DCI one day-er.

Maybe now that there'll be an ITS and Chuckwallah being financially successful, some of the local chapters will look into adding one more weekend in their annual track schedule.

One can only hope.