Re: Hey BillH !!! |
Subject: Re: Hey BillH !!! by BillH on 2012/1/17 4:01:09 Quote: TommyT-Bone wrote: 83 911 widebody. Stock performance pressures 34 rear 28 front. Running street performance W rated Falken Ziex tires. Digital pressure guage (describe real) No heat gun. . I constantly get asked "What press do I run?", I ask "What did you run the last time?" - "I'm not sure." "What was the track temp, was it cold or hot?" - "I don't know" So, these guys are starting over every time they get on the track. What you can do is start at 28/34 and feel what the car is doing, is it pushing, is there oversteer that is not throrttle induced? AND you have to keep notes,you can't keep this shit in your head, there's way too much to think about at the track. Doing it this way. you're only choice is experimentation, drop or raise press by 2-3 lbs (1/2 lb drops come after you get this figured out) and you may want to drop/raise just the front or just the rear depending on what the car's doing. The correct way - get a tire pyrometer (not as good, but better than nothing, an Infrared Thermometer with Laser Targeting, HF-$40). As soon as you shut the car off after a run, take temp readings in 3 places on every tire, then take the pressures, write them down. Then drink your water and bs with the other drivers. What you look for is even temps across the tire (though camber plays into this, i can explain that later). If the center of the tire is cooler, the press is too low, if the center is hotter, the press is too high. On the first run group of the day, the track temp will come into play for your initial settings, you may have to bump up a bit. Pressures in a run group after your first run may be too high (tires too hot). Our fast guys water the tires down with a garden sprayer to cool then down rather than droppinp pressure. Easy peasy, huh---no, it's about homework just like driving faster is about seat time. Let me know if you have any questions. Here's my good gauge (s). And my tire temp/pressure sheet. One of these sheets gets filled out every time I go to the track.
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