I always thought the PCM was limited to 7k rpms. However , I remember a discussion on some PCMs being able to go to 7200k. Can anybody shed some lite on this ? I am bumping the 7k limit close to the end of the 1/4 and was thinking an extra 200 rpms would do the trick. Also, what exactly happens after the 7K limit is reached? I have heard that the fuel is cut.

 

On Obd1 cars the ECM crashes and the engine shuts off. You have to key off and restart. OBD2 cars give you a little more RPM range, but tuning in the upper RPMS is tricky

 

That would not be good!

 

Not to sure about the 7K myth...but I know on my 93 with tunercat I can control the rpm the fuel is cut off at.

 

You can set the fuel cut-off at however high rpm you want, but you just won't be able to rev there since there aren't any fuel/spark tables going beyond 7k

 

yeah...I forgot about that.