19 Bullit trackprep Pt-2b - IMBOC
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post #1 of 8 (permalink) Old 01-30-2019, 01:03 PM Thread Starter
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Talking 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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post #2 of 8 (permalink) Old 01-30-2019, 07:11 PM Thread Starter
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post #3 of 8 (permalink) Old 01-30-2019, 08:35 PM
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Great write up as usual. On my car i have torqued my wheels to 100 ft lbs but I haven't torqued them to 150. I really like write up for the different years. thanks for this...
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Bullitt 3130 has a few modifications mostly suspension and braking work for the fun twisty roads. and an teenage(15) female Mechanic who wants to track her car.

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post #4 of 8 (permalink) Old 01-30-2019, 09:14 PM Thread Starter
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Only the new Bullits are torqued to 150 ft/lbs because they have 14mm studs, the earlier cars with 1/2" studs are 100 ft/lbs. You are correct sir! Thanks for the comment.
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post #5 of 8 (permalink) Old 01-31-2019, 08:04 AM
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that is helpful to know about the new Bullitts. Did this start for the 19's or are the 17, and 18's also 150ft lbs?
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post #6 of 8 (permalink) Old 01-31-2019, 10:24 AM Thread Starter
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I believe 2015 was the changeover to 14 X 1.50 mm thread studs. The wheels are different as well, slightly different bolt pattern, metric as well. I think when they changed to IRS was the switch, best I can see? Check owner's manual under "tire and wheel specifications" to confirm.
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post #7 of 8 (permalink) Old 01-31-2019, 03:29 PM Thread Starter
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post #8 of 8 (permalink) Old 02-01-2019, 01:43 PM
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Yes, it was for the 2015 model year that the wheel studs were upsized and the torque specs changed. I also prefer the non-staggered set-up for handling but maintenance too. I wonder if the smaller diameter front tories were to reduce tramlining that the larger width wheel/tires often lead to on the road.
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2001 Ford Mustang Bullitt - black, #1118, VIN 1FAFP42X21F213026
2009 Ford Mustang Bullitt - highland green, #6323, VIN 1ZVHT82H995129122
2019 Ford Mustang Bullitt - dark highland green, K1254, VIN 1FA6P8K06K5500726
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