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Dyno analysis (feel free to tell the M5 folks) (archive)

[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]

Posted by Jim C. on April 03, 2000 at 12:36:17:

In Reply to: A Bit More posted by Jim Conforti on April 03, 2000 at 10:06:03:

Someone's been posting this "dyno sheet" around the internet,
so let's do some analysis and separate fact from fallacy.

Before we go onto the power aspects, let's look at the air fuel ratios.. (this is the giveaway)..

Either this car hasn't adapted fully, or you're going to be seeing melted Aluminium quite soon.

Take a look at the AFR readings..

Running 14.3:1 at WOT at 6000+ rpms..

(not for too long)

Now, let's go to the purported "HP maximums"

281 vs. 273.4??

Now I see the numbers.. but I certainly don't see an 7.6HP difference in the actual graph.. Oh, you mean the anomaly where you dropped off the throttle.. sorry folks.. that don't count.

(Did I mention hidden agenda?!? ;)

Now.. 275 vs 273.4 is more "realistic".. and if I have to give up 2 HP to keep the motor together under sustained hi-speed, then such is life.

(But I dont..)

Although I'm betting you'd find that in a few minutes, when the car adapts the midrange out, you'd see a big difference.

Jim C.

PS: Oh, and the "my car blew away the other one" is completely BOGUS, as you won't even SEE the effects of 10hp in a drag race, it will be lost in the "driver differences"

PPS: This is exactly why I tell people to find
a dyno shop that can also EXPLAIN the results
to you in a scientific manner. There are few

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