And by turning up the fuel rate on any car or truck sold in the US, you are breaking Federal law. If you ever have to take a tailpipe emissions test, you could fail it and pay a hefty fine. There is a good reason auto manufacturers don't do the power and mileage tricks you guys 'invent': They can't certify those configurations at the EPA Lab in Ann Arbor Mi. If the vehicle doesn't pass the tests and get certified, it can't be shipped to a dealer.
More Horsepower, Same Cubic Inches?
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sparrowhawk
Silver Member
Actually I disagree here on a couple counts. First, fuel rate is absolutely something you can adjust above spec, where the EPA cares is at the tailpipe. Exhaust gases are regulated and tampering or removing an EGR, O2 sensor, or catalytic converter results in a federal fine.
The reason that manufacturers don't tune to higher performance levels is a couple-fold: regional differences in climate and availability of similar fueling sources. As a result of these two items, manufacturers have to typically stick with a more broad level of tune to compensate for the lowest common denominator. Also, warranty does come into play and I'm sure they keep with a large margin of error when they tune their engines. That's not to say that swapping out a nozzle on an injector will cause grave issues, because it won't, however it can put additional strain on the injector IF you were to change the pulse widths with a computer program change. This would cause a change in the duty cycle and could cause premature failure.
Manufacturers also have to take into consideration market and competition as well.
