Originally Posted by C63 Guy
I've been learning a little about dynos lately, and from what I can tell Dynojet = high numbers, but kind of inconsistent. The one at evosport would vary by 10-15hp/run and up to 30hp/session. (To be fair, it's in a corner with really crappy ventilation, but it seems par for the course with that type of dyno). DynoDynamics & Mustang = lower numbers, but repeatable. A friend that has a Bimmer shop has a DD and I've seen 3 runs back to back that are all within 3hp.
And then there's how the car is strapped down, too. Tighter straps = lower numbers.
And tire pressure. Higher pressure = higher numbers.
And wheel weight...
And gas used...
But you get the idea. It's a big part of the reason a lot of mods don't make the claimed power on "your car" that they make for the manufacturer. (Not to mention the bull**** factor.)
Back to MThis' car... 455rwtq on a DD is a siiiiiiiick number. I'm still loopy about that.
Actually Mustang Dyno and Dyno Dynamics can vary quite a bit as well..... probably more so than dynojets in some cases. For example, I dynoed my car at a Mustang Dyno (on a brand new machine with the latest/greatest hardware/software options) and got 500+ rwhp and the car is 100% stock. Bassn_07 dynoed on a Mustang dyno and got 447 rwhp and he runs 10.80s all day long....
Numbers are all over the place. The situation is not much different with dyno dynamics: we just found out that Autowave (a well-known and well-respected dyno dynamics shop in south California) raises their numbers by 11% to match dynojet numbers. It all depends on what the operator wants the number to show high or low. My dyno is posted in the W211 section but it was done a while back so may need digging up.