Hello,

I got a HI-6 on my blower car and i'm having problems with it reving past 4,000rpm.. I was wondering if thats a common problem with these boxes.

What makes me think its the box is that the instructions say that is the point where it makes its transistion from multi spark to single spark

 

I should mention the car runs like crazy before and after 4,000.. ITs just like a rev limitor at 4 though