Engine Blown!

Lolopop

Ok engine blow is my new suggestion. If you don't shift, your engine blows, making you have to repair it. This also avoids fast cars from tricking slow racers by not shifting and making the car seem slow. If you don't shift for a certain amount of time, your engine blows and you have to repair it, making those cheaters have to really risk their cars.

Nolan Speer

I remember on NFSU2 when you would use drag race mode if you didn't shift your heat would go up rather fast, and once it reached a certain point the engine would blow making you automatically lose. It would gradually go down when you weren't redlining so as long as you'd race normal and not top out the whole time you would be fine. I think this would be something cool to implement, however the Evo VIII would end up blowing every single race so the shifting patterns on it would have to be changed.

Mud Digger

This is a good idea, but It would suck in instances when the car wouldn't shift after I tap it. But I guess if it's after a certain amount of time, it would work well... As far as people sand bagging, they can always up shift quickly and get the same effect.