Video: Viper Maxes out the Dyno

Shaun41178(2) · Post by **Shaun41178(2)** » Wed Apr 27, 2005 6:49 pm

I am sure Steve Kelleys Green booger could max out a dyno on the spray as well.

http://www.6speedonline.com/videos/ryansTT.wmv

p8ntman442 · Post by **p8ntman442** » Wed Apr 27, 2005 7:07 pm

hope he has a sweet roll cage tucked under that convertable top.

Kohburn · Post by **Kohburn** » Thu Apr 28, 2005 6:55 am

dear god - the thought of having over 500 ftlb torque at under 3000rpm

The Dark Side of Will · Thu Apr 28, 2005 8:03 am

He's got seven hundred at 3,000 RPM

I haven't watched the video yet... what turbos is he using? Looks like they spooled by 2500 or so...

Dam... one thousand horsepower is small potatoes these days...

The Dark Side of Will · Thu Apr 28, 2005 8:12 am

Just watched the video... izzat a puff of oil smoke that comes out of his side pipe when he lifts? Wonder how long that engine is going to last...

Doug Chase · Post by **Doug Chase** » Thu Apr 28, 2005 1:46 pm

Impressive results. Pretty boring video, though.

2.8s are much more exciting on the dyno because it takes like 20 seconds to go from 2500 to redline.

crzyone · Post by **crzyone** » Thu Apr 28, 2005 2:39 pm

I just did a hp calculation and the peak hp I could find was 1207hp @ redline. Pretty damn impressive. I was just using his torque numbers and rpm.

Doug Chase · Post by **Doug Chase** » Thu Apr 28, 2005 4:00 pm

crzyone wrote:I just did a hp calculation and the peak hp I could find was 1207hp @ redline. Pretty damn impressive. I was just using his torque numbers and rpm.

Unlike brake dynos which directly measure torque and calculate horsepower, inertia dynos measure power and calculate torque*. Therefore the 1207 you calculated isn't more accurate than the 1200 that the dyno maxes out at.

(*more accurately, inertia dynos measure the acceleration of a known mass and use this information to calculate power and then torque )

crzyone · Post by **crzyone** » Thu Apr 28, 2005 5:16 pm

Thanks for that, I had no idea. I just saw how it kept measuring torque after the hp had already maxed out. You would think if it can still measure torque, it should be able to display hp numbers above 1200.

Post by **eHoward** » Thu Apr 28, 2005 5:41 pm

That's insane.

bryson · Post by **bryson** » Thu Apr 28, 2005 6:50 pm

edit: right click, save as

Doug Chase · Post by **Doug Chase** » Thu Apr 28, 2005 7:29 pm

crzyone wrote:I just saw how it kept measuring torque after the hp had already maxed out.

I saw that, too. I think that it's not actually measuring torque. Because of the linear relationship between hp and torque, if hp stays constant then torque will decline linearly as rpm increases. In this case that linear decline of torque blends in with the torque curve up to that point so it's hard to see.

The Dark Side of Will · Thu Apr 28, 2005 8:43 pm

Or maybe it just got to the top of the graph and couldn't go any higher...

The Dark Side of Will · Thu Apr 28, 2005 8:46 pm

Doug Chase wrote:Unlike brake dynos which directly measure torque and calculate horsepower, inertia dynos measure power and calculate torque*. Therefore the 1207 you calculated isn't more accurate than the 1200 that the dyno maxes out at.

(*more accurately, inertia dynos measure the acceleration of a known mass and use this information to calculate power and then torque )

Ahhhh yes! Some nits to pick!
Inertia dynos measure acceleration of a known mass... that sounds like a force to me. Since it's a force applied at a known radius, it's a torque.
They measure the angular acceleration of an object with a known moment of inertia. Torque is the rate of change of angular momentum, just as force is the rate of change of linear momentum.

The Dark Side of Will · Thu Apr 28, 2005 8:46 pm

How the hell did they keep that thing from spinning its tires on the dyno?

Shaun41178(2) · Post by **Shaun41178(2)** » Thu Apr 28, 2005 9:07 pm

its all in the way that it is strapped down.

A lot of times people don't strap the car down properly which is why you see them move even with only v600 rwhp.

And also Will you are right.

The dyno just ins't able to read higher then 1200 hp.

The Dark Side of Will · Fri Apr 29, 2005 6:53 pm

What is good strapdown technique?

I've heard of things like airing down the tires, strapping the shit out of it, then reinflating the tires and taking a pull to heat them up then being able to get a good pull subsequently.

Doug Chase · Post by **Doug Chase** » Fri Apr 29, 2005 7:24 pm

The Dark Side of Will wrote:Ahhhh yes! Some nits to pick!

Fair enough. I guess it would have been more accurate to say that we're not directly measuring force and instead we're measuring time and drum speed (or position, I don't know the intimate details of Dynojets).

With this information we can calculate both hp and torque. Since we have to get out the calculator then it doesn't matter which one we solve for first. My point was simply that the torque line on the graph doesn't contain any more information than the hp line.

:blah5:

The Dark Side of Will · Fri Apr 29, 2005 8:10 pm

Same way on any dyno. A brake dyno directly measures force applied by the brake mechanism and calculates torque based on physical dimensions and friction characteristics of the brake mechanism, so it doesn't directly measure torque either.

Shaun41178(2) · Post by **Shaun41178(2)** » Fri Apr 29, 2005 8:53 pm

The Dark Side of Will wrote:
I've heard of things like airing down the tires, strapping the shit out of it, then reinflating the tires and taking a pull to heat them up then being able to get a good pull subsequently.

YUP!

What you will have a lot of times is people just throwing the car up on there and strapping it down to where it "feels" good and tight. Sometimes in high hp cars its not.