When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Depends, I usually used locked since its more comparible with a M6 car (and it looks better :) but I always say its locked ) even though unlocked is what you you will be seeing going down the track.. I think if you are looking to compare dyno HP locked evens things out a bit..
Some shops lock the converter to dyno, some dont - the converter will never lock up at WOT throttle on its own unless you do a switch or programming.
High horsepower/high stall cars should be dynod locked if you want the RPM on the graph to be accurate on a dynojet.
I think if you're trying to measure engine performance the converter needs to be locked (to minimize converter effects.) If you're trying to measure the power produced by your whole driveline, it needs to be unlocked. Ideally you'll do both.