Quote:
Originally Posted by Jim968
All that said, I've never witnessed an engine being dyno'ed on a stand, only in the car on a chassis dyno. If you have some sources or industry experience on how its actually done I'd like to learn more.
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Plenty of Youtube videos of engines on dynos. First of all, instead of a transmission they bolt the dyno brake onto the rear of the engine. Most of the ones Ive seen they are using optimal exhaust (headers, length of tubing, mufflers if applicable.) Here's one video, as you can tell if the room was larger they could fit any exhaust they wanted on the engine.
It would be naive to think GM doesn't do extensive engineering and testing on their exhaust systems. They want to make the most power they can while still meeting noise and emissions requirements.