Can someone explain to me why is there such a difference between the advertise HP and what a Dyno test shows for a 370z.

Not to be a d!ck, but try the performance section of the forum^^.... Back on topic, gun metallic with amuse body kit off of rockaway near 104st anyone?

.....because the powertrain components connecting the motor to the wheels create resistance/friction, which in turn creates a loss in hp to the wheels. The advertised hp is at the flywheel and correctly measures the output of the motor itself. This is usually measured before the motor is installed in the car using an engine dyno. A wheel Dyno is used to calculate gains or loss in hp from a baseline pull, not measure max hp as most people think. It's to give you a fairly accurate reading to see if your modifications or tune is creating or losing power/torque. You also can't rely on wheel Dyno numbers alone since each Dyno is different and the hp readings can vary greatly based on temperature and altitude. This is why you try to shoot for the same conditions using the same shop.

Should have
 

Thanks it all seems so obvious now when someone explains it. I check out horsepower on cable and I see them testing the engine on the dyno the way you mentioned.... feel like such a rookie!!!!! thanks again for taking the time to explain.

Black nismo bronze rims two center pipe exhaust south bound Austin blvd. gave you a nod when you passes jimmy hays

Spotted a Silver 350z, heading west on the Belt Pkwy

Spotted a black 370Z Nismo with temp Jersey plates in Korea Town, NYC 6PM today.

so freshhhhh still with the temp plates :yum:

spotted a white Nismo over the weekend in the Bensonhurst/Dyker area. Was parked in the street.

spotted a silver 370z on Deer Park Avenue this afternoon

I was in my solid red z34


http://scontent-a-lga.xx.fbcdn.net/h...12067832_n.jpg

Spotted a red based with Jersey plates yesterday (Sunday) on 3rd Avenue Brooklyn after the Norwegian Day parade.

Spotted a black Nismo at the gas station/7-11 in front of my work place today in LIC this morning. driver was in the car and I was running late for work so couldn't stop and chat if he was on the forum.