Join Date: Jul 2017
Location: Nobel Ontario Canada
Bullitt Year: 08
Bullitt Color: DHG
Bullitt Serialized Number: 4404
19 Bullit trackprep Pt-2b
Tires and wheels, tracks and traction, pressures and pyrometers.
Well, lets dig in. Bill mentioned in a previous thread that you'll need a good tire pressure gauge (certified/calibrated), a pyrometer to measure tire tread temperatures, and a good torque wrench. Add an extra set of quality lug nuts for the track. (McGard or such)
Your new Bullit comes with 255/40/19 tires (9" wheels) on the front and 275/40/19 tires (9.5" wheels) on the rear. Staggered fitment does not mean the car will handle better or worse. Often the fitment has to do with stance or straight line traction. A GT comes standard with 255/40/19's all around. The disadvantage of staggered fitment, especially if the tires are unidirectional, is that you can't rotate the tires to equalize wear at the track. Regardless, if you are using the standard set up, torque your wheels to 150 FT/Lbs and set your tire pressures to about 28 psi to start. They will heat up and "air up" on the track. After the first session check your tread temperature across the tire. Tread temps. lower in the middle add 2 lbs air, higher in the middle remove 2 lbs air. Your goal is to get the temps. either equal across the tread or gradually cooler from outside to inside, since you usually generate heat more on the outside edges. Check wheel nut torque at lunch break. Record the pressures for all four corners when you get it the way you like it. There is really no ideal temperature, since each tire has it's sweet spot that you can feel.
If you decide to buy track wheels and tires, this would be my suggestion. Buy a set of 10" or 10.5" wheels, all the same, and start with four 275/40/19 tires. There are a large choice of tires in this size and you can rotate them for best wear. With more experience you can move up to 295/35/19 on the same wheels. You might even be able to go 305/30/19, but I'd want to try one on the front first. The GT 350R's go as high as 305's on the front and 315's on the rear, but I believe they have more front fender clearance?
Anyway, the stock tires are a good place to start. Get ready to shoot the money gun regardless, as a set of tires will be $1200 US. Plus wheels, plus, plus?
When you go to track days, you will have to learn to control your Adrenaline and Testosterone, breathe in through your nose, out through your mouth. Hydrate well. Try to relax your hands and avoid the "red mist" or road rage, as you will likely encounter individuals who are not so talented or "fully evolved." If you are tired, skip the last session. Most crashes happen in the last session.
Have fun, and come home safe. As always, questions, comments, likes are welcome.
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In my defense, I was left unsupervised.
Last edited by bullit4404; 01-30-2019 at 10:25 PM.