Auto Club ROVAL video

[CURVES]

That's some fun right there!

[dale68z]

I was cool with the speed on entry of turn 1 on the oval, at first. We initially were about 130ish mph on the first couple of sessions. As we got more confidant and started to enter closer to the wall were at 140 mph. The last session we gained 12# of tire pressure. My brain started to work. I became a bit worried about a tire issue sending us into the wall. There would be absolutely nothing I could do to avoid the outside wall if a rt front tire went down.
So, we didn't slow down, just didn't try to go faster.

It was great fun, and the experience was made even better because my buddy Tom LM7_67 is on track with us.

[Chad-1stGen]

Cool!

[LM7_67]

Originally Posted by dale68z

I was cool with the speed on entry of turn 1 on the oval, at first. We initially were about 130ish mph on the first couple of sessions. As we got more confidant and started to enter closer to the wall were at 140 mph. The last session we gained 12# of tire pressure. My brain started to work. I became a bit worried about a tire issue sending us into the wall. There would be absolutely nothing I could do to avoid the outside wall if a rt front tire went down.
So, we didn't slow down, just didn't try to go faster.

It was great fun, and the experience was made even better because my buddy Tom LM7_67 is on track with us.

hit 140, lift, apex at 112, get up to 130 again before braking for what felt like a really tight left/right combo....

[Track Junky]

Thanks for posting. I've never been on that track. Looks like fun. Certainly looks like you can reach well above 140 if you wanted to.
12 lb hike in tire pressures is huge. Goes without say but you might want to drop a little more air out of the tires next time out.
Just out of curiosity what were your tire pressures cold?

[dale68z]

Originally Posted by Track Junky

Just out of curiosity what were your tire pressures cold?

We start out with 33 front and 28 rear. The car weighs 3619 then throw in 400 # of driver and passenger. Typical tire temps are about 10 deg diff outside center and inner. My inner is higher temp. But I had added an 3/8 addl - camber. My old camber setting of a heavy 2 deg had my tire temps pretty even across the face.

[Track Junky]

Originally Posted by dale68z

We start out with 33 front and 28 rear. The car weighs 3619 then throw in 400 # of driver and passenger. Typical tire temps are about 10 deg diff outside center and inner. My inner is higher temp. But I had added an 3/8 addl - camber. My old camber setting of a heavy 2 deg had my tire temps pretty even across the face.

That is a heavy car. If it were me I'd be thinking about a brake system upgrade.
So you were at 45 lbs hot up front and 40 lbs rear? I know there have been a few guys that have run the NT-05's on here. Maybe they will chime in with some recommended tire temps.

[GregWeld]

Before I came back to comment - or saw the other comments - I was thinking to myself --- WOW -- the tires really started losing grip once they got some heat into them... That would be the OPPOSITE of what I want out of my tires! LOL



Fun to watch video!

[dale68z]

The video is back to back 20 minute sessions. The last session we let 12 # of air out of the tires. This brought them to our cold pressures, after they had already heated up. Based on the outer wear on the front tires, letting the air out was a mistake.

I need to listen to the video to see if there is a difference in the singing of the tires after we let the air out. Especially the sound on the oval, that is steady state cornering and driver input is less of a factor.

With those pressures we lightly corded the outside of the left front at Inde a couple of months ago. That is the reason I increased the neg camber.
I need to go back to paying attention to tires more than I have been.