There are two options files for Nheat. One in nascer heat folder and one in the run folder. Open up these options files with notebook. Scroll down to the GLOBAL section. Look for pack_size. Mine is set on 42. If yours is lower, change to 42 and save. Thats all i got for you. Good luck. Its a fun game.
Thanks guys i have found that 22 chassis + a game installed pace car is all it will allow even when i set the option files to 42
guess i'll have to live with a 22 chassis field
Stan
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s.e.b.