What Car Do You Own?

[[XC] Lead Head]

230whp on a mustang dyno = about 250-255whp on a real dyno.(dynojet)

A dyno is a dyno. There is no such thing as a real dyno, and a fake dyno. There are two main types of dynamometers used today, eddy current dynos and inertia dynos.

Inertia dynos use very very heavy drums and calculate how fast the car is accelerating the drums to give you a horse power reading. This is the kind of dyno that requires you to be in a certain gear as a lower gear can give false readings although software can compensate and adjust the readings. These dynos usually have issues with cars/trucks with large turbos because often by the time the turbos are spooled, the drums are already near maximum speed.

Eddy Current dynos often use lighter drums and can put an actual load on the vehicle. Think of an inertia dyno as spinning a large weight by hand, while an eddy current dyno as spinning a generator with a load on it by hand. Eddy current dynos are typically called "tuning dynos" because they can hold a specific RPM/wheel speed so you can making tuning changes on the fly and see how they are effecting performance. They can also use that ability to hold a certain RPM/wheel speed to let turbo chargers spool up before beginning the actual dyno run.

DynoJet and Mustang Dyno make both kinds of dynos.