Quote:
Originally Posted by DynamicFit
13.7 to 13.9 AFR is pretty damn safe in my opinion, in fact you probably are making even better power than most of us if you are running an AFR close to that on a naturally aspirated motor. 12.0 A/F is something you might want if you are running a turbo or other F/I, but as you are only N/A even 13.9 A/F is pretty reasonable considering ideal combustion is 14.7.
Your motor is fine.  |
Its not safe at all. 14.0- 15.0 AFR's is what cars run around at cruising speeds and 1/4 throttle.
To make good power and be safe in a NA car, 12.5-13.0 AFR's.
Turbo cars are suppose to run 11.0-11.5 AFRs to be safe. I have one
On race gas I keep her at 12.0-12.2 with advanced timing.
Almost any aftermarket engine piece is considered a "race part."
Honestly, I think this testpipe slowly ruined my motor. Recently, my car has been giving me shit MPG. 29-32MPG. If it sits at idle for a while when its hot out itll puff smoke if I rev it. Its only when I rev it though. And it clears right away. However, a new car should not do this.
And its blue smoke, which is burnt oil.
However, I MAY be ok due to me not having a header. I do remember headers with large runners are what make the Fit lean.