Quote:
Originally Posted by Steve W
Proper AFRs are just as important as optimal ignition timing to achieve optimal performance. For a normally aspirated motor such as ours, at full throttle, too lean such as 14.0 and the engine runs hot and can’t take much ignition advance loosing torque and HP overall. Too rich such as 11 or 12 and the excess fuel extinguishes the burn, reducing the peak combustion pressure and thus loosing overall torque and HP. As the chip tuner of target here, from tuning many 911s over the years, through hundreds of dyno runs each year, correctly optimizing the AFR makes half of the HP and torque gains over the stock programming. In certain rpms, it’s responsible for as much as 2/3rds of the gains. The remaining half is from ignition timing optimization. And you can't properly optimize timing if the AFRs are off for the very reason stated at the beginning of this paragraph.
|
Anyone that has done any amount of dyno proven tuning ,fuel injected or carbureted, will agree with this.