nwpadmax
Turbo Geek
- Joined
- Nov 22, 2006
- Messages
- 3,128
Illiniosram-
Yeah, I have also been told by the guys in the machine shop that indeed the red ones are the finest :hehe: They did their own research (or so they claim)!
The SuperFlow is a smaller version of a Taylor (what a lot of semi shops use). Taylor makes some BIG water brake absorbers that do the same job as an eddy current absorber...and as was stated above the SF can do a "suckdown" test if that's what you want.
I tried once to get a local semi shop to hold a dyno day but there was something that they couldn't do...can't remember if it was the MPH range or what but there was something about the setup on the mongo unit that wasn't going to fly with pickups.
As for your dyno runs, you changed some things and I'm not surprised that you got different numbers. I mean, you changed stuff and expected different results, otherwise why make changes.
The difference between those two methods is substantial....about 12 secs on the DD and less than 3 seconds on the Danville unit. Danville's dyno has always seemed to read high, at least to me. No one has ever published any authoritative data on it however so it's all opinion. I got in an argument with one of their guys over his numbers and I said I'd pay for his time on a SF to see what the comparison was, but he never took me up on it. If they can prove me wrong with real data, collected and analyzed correctly, then I will eat crow.
As for the weight of the roller, it's not as simple as mass alone. When you launch your truck on the street, you have the entire mass of the truck to accelerate in a line.
Spinning a roller is a bit different....the "load" here is the rotational acceleration. Imagine if the roller were on really good bearings, you could probably start it moving with your foot, and you don't have 500 horsepower in your feet. But you wouldn't be able to spin it with any speed like your truck can. So the load is derived from rotating it from X rpm to Y rpm in Z time. It's trying to equate the linear acceleration of your truck with rotational acceleration of a drum. So it's not as simple as making the roller weigh the same as your truck.
I need to go back and read the formulas to explain it better. But the point is, DJs don't measure torque directly. If you can measure torque, HP is one simple equation away.
Yeah, I have also been told by the guys in the machine shop that indeed the red ones are the finest :hehe: They did their own research (or so they claim)!
The SuperFlow is a smaller version of a Taylor (what a lot of semi shops use). Taylor makes some BIG water brake absorbers that do the same job as an eddy current absorber...and as was stated above the SF can do a "suckdown" test if that's what you want.
I tried once to get a local semi shop to hold a dyno day but there was something that they couldn't do...can't remember if it was the MPH range or what but there was something about the setup on the mongo unit that wasn't going to fly with pickups.
As for your dyno runs, you changed some things and I'm not surprised that you got different numbers. I mean, you changed stuff and expected different results, otherwise why make changes.
The difference between those two methods is substantial....about 12 secs on the DD and less than 3 seconds on the Danville unit. Danville's dyno has always seemed to read high, at least to me. No one has ever published any authoritative data on it however so it's all opinion. I got in an argument with one of their guys over his numbers and I said I'd pay for his time on a SF to see what the comparison was, but he never took me up on it. If they can prove me wrong with real data, collected and analyzed correctly, then I will eat crow.
As for the weight of the roller, it's not as simple as mass alone. When you launch your truck on the street, you have the entire mass of the truck to accelerate in a line.
Spinning a roller is a bit different....the "load" here is the rotational acceleration. Imagine if the roller were on really good bearings, you could probably start it moving with your foot, and you don't have 500 horsepower in your feet. But you wouldn't be able to spin it with any speed like your truck can. So the load is derived from rotating it from X rpm to Y rpm in Z time. It's trying to equate the linear acceleration of your truck with rotational acceleration of a drum. So it's not as simple as making the roller weigh the same as your truck.
I need to go back and read the formulas to explain it better. But the point is, DJs don't measure torque directly. If you can measure torque, HP is one simple equation away.
