Another R35 on the dyno - 457 whp - 520 at the engine

[tyndago]

http://2009gtr.blogspot.com/2008/02/520-hp-at-engine-gtc-r35-gt-r-uk.html

"457 horsepower at the wheels using BP Ultimate 102 octane fuel. "Ordinary UK quality petrol is required to meet a MON rating of 85, with premium fuels typically having a MON of 86. But not only has BP Ultimate 102 been specially formulated to have a RON of 102, it is also guaranteed to have an incredible 90 MON rating."

In the US 102 RON + 90 MON / 2 = 96 PON"

[aco]

I know that the other dyno was 480 hp at the hubs on a different machine, car, conditions, etc. Is this normal to have this wide of a discrepancy?

[tyndago]

I know that the other dyno was 480 hp at the hubs on a different machine, car, conditions, etc. Is this normal to have this wide of a discrepancy?

How wide is the discrepancy ? 457.7 to 480 hp ? Within 5 % really. I think that well takes into accounts different dynos, different correction factors.

I see the numbers as being the same , you should too.

[JNKCV]

Sean is absolutely correct! Most of the time Mustang dynos read lower "out of the box". Do you know what type of Dyno was used?

[tyndago]

That dyno was a Dastech or Dasquick or something like that, doesn't really matter that much.

Nothing is ever perfect in real life. You have a tolerance. +/- 5% is well within tolerance for most everything . You also can have these stackups of tolerances so things can be additive or subractive depending on how the stackups go.

I did gage calibration when I was in the Navy, and the thing it taught me was to take everything with a grain of salt, measure twice , and always know it could be good today, and bad or off tomorrow.

Dynojets read a number, Dynapacks read a number, Dyno Dynamics read a number. The problem is when all the keyboard warriors take the numbers to be a be all /say all/ end all number. I find most Dynos fall within around a 5% range.

[alan-n]

Thats why the only number that really matters is how fast the car actually runs. Going by 1/4 mi trap speed and the vehicles weight, yes it would take 530-550 hp to get this thing going 121+mph traps. Dyno's should be left as a tuning tool. But nice to see them.

[tyndago]

Thats why the only number that really matters is how fast the car actually runs. Going by 1/4 mi trap speed and the vehicles weight, yes it would take 530-550 hp to get this thing going 121+mph traps. Dyno's should be left as a tuning tool. But nice to see them.

Easy to say , harder to convince people otherwise. Everyone uses them as a Pen15 measuring tool.

The horsepower explaination is pretty easy when you look at the 911 turbo specs. 480 hp. If the Porsche goes up, the GTR will go up too.

[alan-n]

Easy to say , harder to convince people otherwise. Everyone uses them as a Pen15 measuring tool.
Yep, pretty much the same reason how automanufacturers can get away with making up HP, torque, or towing ratings unless it is done on a standardized machine under controlled conditions. I'll stick to the numbers the car actually puts down at the race track..... mustang dyno, dynojet, high altitude, low altitude, freezing temps, AZ heat, blah.