Bullet Performance supercharger by Mercury Performance

[SYC086]

Originally Posted by os86

Did you not hang around to see the results ???

Believe me I wanted to but I didn't have time

[MANDALAY]

Originally Posted by Rocketogre

Wait, so are you claiming that the lower inertia dyno rollers used on that 4wd dyno make it more accurate than single high-inertia roller 2wd dynos?

Yep,

If i was a dyno queen i can put my car on a single wheel dyno and up will go the figure.

[Coheed]

I claim BS. A mustang or a dynojet reads the same, regardless of where on the planet you are located. If you guys can't get a dynojet, then it sucks to be you :P

Dynojet and mustang are like the gold standards. And everyone knows dynapack reads high, so neener neener.

[xwd]

Will be interested to see the numbers.

Comparing dyno numbers from different dynos is stupid. Just want to see the before and after and the difference on the same dyno.

At least we aren't like the UK guys who like to state flywheel HP (BHP) for everything, that's even more of a guessing game.

[WTF]

Originally Posted by Coheed

I claim BS. A mustang or a dynojet reads the same, regardless of where on the planet you are located. If you guys can't get a dynojet, then it sucks to be you :P

Dynojet and mustang are like the gold standards. And everyone knows dynapack reads high, so neener neener.

Most places in Australia use the dyno dynamics dynos. I have never actually seen a place in Aus with a single roller dyno, and I have been to a lot of shops.

Australian dyno's typically read lower than USA dynos, for this reason, at the end of the day unless you are after outright dyno queen numbers, it shouldn't matter. All that should matter is that you compare before/after mods on the same dyno.

[Coheed]

Exactly right. In a way, a hp is a hp. It would be ridiculous if 1/4 mile times were affected because every country made up their own length of track. Imagine running 11.50 in USA, and 11.80 in AU, and 10.0 in EU. That's how I feel dyno numbers can be a lot of times.

At the end of the day, 550lb moving 1ft/sec is 1 hp. With a fixed measurement like that, why are some dynos reading low, and others reading high? It's like buying calculators in different countries, plugging in the same numbers and equations, and getting a different result. What a joke.

[JP]

it's not unusual to see a 300hp "Dyno Dynamics" car run more MPH than a 300hp "Dynojet" car at the 1/4.

[Danzzt231]

Hi Jason.

[xwd]

Aren't all the 1/4 mile (or whatever it is in metric) tracks in Australia run downhill at a 10 degree slope?

[serialk11r]

Originally Posted by Coheed

Exactly right. In a way, a hp is a hp. It would be ridiculous if 1/4 mile times were affected because every country made up their own length of track. Imagine running 11.50 in USA, and 11.80 in AU, and 10.0 in EU. That's how I feel dyno numbers can be a lot of times.

At the end of the day, 550lb moving 1ft/sec is 1 hp. With a fixed measurement like that, why are some dynos reading low, and others reading high? It's like buying calculators in different countries, plugging in the same numbers and equations, and getting a different result. What a joke.

550lb acting on a 1 ft long lever spinning 1 revolution per second you mean? (I have no idea what the correct number is)

I'm pretty sure it's a matter of calibration, and drivetrain mass. When you run a car on a dyno, the data gets fudged because you have the drivetrain accelerating, the rollers have rotational inertia, etc. So they may all be standardized and supposedly accurate to say a few percent, but then the actual amount of power they're measuring isn't so clear because not all the power makes it to the rollers in the "intended" way, whatever that is. So you can end up with huge differences.

[Coheed]

Originally Posted by serialk11r

550lb acting on a 1 ft long lever spinning 1 time per second you mean? (I have no idea what the correct number is)

I'm pretty sure it's a matter of calibration. When you run a car on a dyno, the data gets fudged because you have the drivetrain accelerating, the rollers have rotational inertia, etc. So they may all be standardized and supposedly accurate to say a few percent, but then the actual amount of power they're measuring isn't so clear because not all the power makes it to the rollers in the "intended" way, whatever that is.

By definition, a "horsepower" is the ability to get work done at the rate of 550lbs moved 1ft in one second. Or 1lb moved 550ft in 1 second. If you took a 1ft circumference, sure your method works. But on a 1ft lever it would be ~6.28ft, so it doesn't make sense to the calculation.

I like the dynojet for actual hp calculation. Spin a roller of xxx weight to xxx speed in xxx time = whp. Very simple and basic math. Use the RPM signal to reverse calculate the wtq output.

[serialk11r]

Originally Posted by Coheed

By definition, a "horsepower" is the ability to get work done at the rate of 550lbs moved 1ft in one second. Or 1lb moved 550ft in 1 second. If you took a 1ft circumference, sure your method works. But on a 1ft lever it would be 3.14ft, so it doesn't make sense to the calculation.

I like the dynojet for actual hp calculation. Spin a roller of xxx weight to xxx speed in xxx time = whp. Very simple and basic math. Use the RPM signal to reverse calculate the wtq output.

It takes zero horsepower to move 550lbs 1ft in 1 second
Sorry, nitpicking is my hobby. You mean it's exerting a force of 550lbs over a distance of 1 foot in 1 second.

[Jordo!]

This is exactly what the car needs.

Nice!

Slap on a A2W IC, offer a nice re-designed hood with fat bulge and/or scoop and call it a day.

You want a flat and fat torque curve -- can't beat a roots blower!

[Coheed]

Originally Posted by serialk11r

It takes zero horsepower to move 550lbs 1ft in 1 second
Sorry, nitpicking is my hobby. You mean it's exerting a force of 550lbs over a distance of 1 foot in 1 second.

No. If it is moving 1ft/sec, work is being accomplished. Now applying 550ftlbs torque to something doesn't mean work is being done, but by moving it you are causing work to be done. Work being done is calculated in hp.