2020 F-53 V-8 Specs
The New 2020 F-53 chassis V-8 will have 350 HP and 468 pounds of torque with a 6 speed trans The 2006 to 2015 V10 Specs The 6.8-liter TritonTM V-10 engine's best-in-class 362 horsepower and 457 fo...
Forum Discussion
theoldwizard1 wrote:
Certification has to do with gross vehicle weight. It has been a long time since I was involved with this, but I think over 10,000 GVW it is dyno certified. (There are some differences in the chassis test for above and below 8,500 GVW.) The certification process proves that it meets government specified emissions. It also generates an MPG which is used in Corporate Average Fuel Economy (CAFE) calculation as well as HP and torque ratings.
IIRC, dyno cert is "engine only". No transmission, etc. I believe it requires "extended" (minutes) operation at or near full power. A chassis certification has very brief (seconds) of operation at full power.
Yes, this is based on GVWR. 10,000 and below must be chassis certified. 10-14,000 pounds may be either (almost always chassis certified because the resulting numbers are bigger), and above 14,000 GVWR MUST be Dyno certified.
The Dyno certification is the stricter test that results in lower numbers because all accessories must be engaged for the duration of the test, from engine fan to EGR. Which is the opposite of the chassis certification where those components are tested at their "ready" state, and because of the short duration of that test, those components don't drag down power.
So... The Dyno cert is probably a realistic number for the most extreme conditions, like climbing a mountain pass in the summer. While the higher higher chassis-cert numbers are more of a best case, i.e. first pull onto the freeway on a cool day...
