Front ends bottoming out?

RollingThunder

RollingThunder

Messages
193
Hey all,
Question...how do I know if my front is bottoming out/rubbing the wheel wells with the tires under hard braking? I've looked at the tire wear indicators on the left side of the screen while I'm braking, turn deep orange under braking in a straight line. Is this just from the hard braking or does it mean my tires are rubbing in the wheel wells? I've made adjustments to springs but didn't want to make them too stiff 'cuz the car will be a bit less responsive....right? Any input would great, thanks.
 
Well, one thing you will notice is the control fluctuations. When you bottom out your car is going to act erratic for a second, not entirely noticeable in a line but if your even on a slight turn you will notice a lot.
If your lsd decel is set correctly, and suddenly your entrance goes from perfect turn in, to loose and uncontrolled, there's a good chance you bottomed out. A lot of people mistake this for bad decel settings and raise it, which is only going to waste their time.
All the pro tuners here know to do the lsd tuning first, leaving the height stock. And tuning the height after, thus avoiding the above mistake.
Golden unsaid rule; don't go below 75% and you "shouldn't" bottom out.
 
Thanks dude. Yeah, I noticed a couple things....I asked over in the general question thread about my car being all whacked out and it was suggested that I leave the settings at default and see what happens, which I did. Solved quite a few problems. One of the issues I noticed was that when I got the adjustable suspension, I would immediately lower the spring rate...thus causing the front end to nose dive, which in turn was frying my tires, even tho I racing hards on. So, I left the settings alone and noticed a marked improvement. Also, I swapped my racing hards up front and replaced them with comfort softs and noticed that I had more grip and the tires weren't cooking nearly as fast. The car I was using was much more predictable too. Also, you're right about the LSD being set incorrectly. I've noticed that under braking my rear end is all squirrely, especially if I'm late breaking into a corner. So, I'm going to adjust that and see what happens. Oh yeah, I forgot to mention, the car I was having trouble with was Corvette ZR1 (CO6) LM race car, which has a PP of 663 and it has just over 800 hp. I use this car as my work horse to make money so I can do other races.
Thanks for the input dude, I really appreciate it.
 
Here's a quick way to set up a makeshift LSD brake setting;

Set it at 10.
Go to test drive, apricot hill.
You start out on a fast streight, and have to brake hard for a left turn right off the bat from high speed.
Make sure you have on CHASE CAM so you can watch your car.
Watch if your loose and unruly as you take that hard slow down turn. Watch as you go IN to that first corner.
Don't like it?
Add 5, making it 15
Try again. Note results.
Add 5, making it 20.
Try again, note results.
You can do that up to around 30-40ish, by then you should have passed the sweet spot.
The trick is, to not go any farther then you have to.
So if say at 25, you were stable enough, but still not perfect, go up by 2 points, instead of 5.
Trial and error until you find your sweet spot.
 
Grand Valley East Reverse is also good for this, essentially the same corner(s) but harder braking. Good tip. 👍
 

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