for future reference you can ask wmmt related questions here
https://wmexpressway.net/index.php?showtopic=34404but to answer your question, assuming you're on international so wmmt5/dx+ and not mt3 (with the magnetic cards) you have to play (and win) 59 stories to get to 830hp (full tune). VS battles don't increase your cars ability.
and yeah you're right, if you make another car you will have to start over. but if you get a friend to send a discard to you (or buy a 2nd banapass and send it from your 1st banapass to the other) you can start in Story 20 rather than Story 1.
http://wanganmaxi-official.com//wanganmaxi...terminal/scrap/ have a read of this page for more info on how discard works.
This post has been edited by WRX22B1998 on Feb 17 2018, 05:09 PM