Quote:
Originally Posted by theadmiral976
The predominant cause of the engine sound and resultant exhaust note prior to the engine reaching operating temperature is negative valve overlap combined with an initial high idle. Simply put, NVO helps warm the primary catalytic converter, lowering tailpipe emissions. See this patent for more information: http://www.google.com/patents/US6394051 |
Thanks for taking the time to reply.
Cool, didn't know google had a patent database haha.
I believe NVO is the negative ignition timing that can be found on the ignition timing post start timing with Romraider. But once the car starts to more, it switches to the primary base tables which does not seem to be affected by temperate. But i didn't consider until now that there are most likely a bunch of other timings based on temperate that would change the resulting exhaust note.