How to change track grip

Hi to everyboby. I have two questions, the first one is How to change the track grip, because with the 1988 trackpack the track is too slippery, wich parameter can I change with the tsm?????
The second question is, if someone have these mod the '93 season mod, the '97 season mod and the '90 season mod?????
Thank you a lot for the answers

There's a specific value for Track Grip in a Circuit .DAT's Magic Data. You need CMagsis (or maybe TSM?) to edit the track's Magic Data. Should do the job

Thank you for the answer, but how can I change it????? If I insert more value the grip is more or less????

Higher value = more grip mate

Thank you very much!!!!!! For the mods I looking for???? Do you have some trick?????

More grip = more fuel consuption!!! So when you increase grip you have to drop down fuel consuption values (cpu and player)

Samuele
32BOBO32

Thank you for the trick bobo, are you the same bobo of GP4 Italia????? and there are 3 parameter for the grip of AI car's in the file .dat, which of those must i change???? I use TSM