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SmokinVette.com Forums : Corvette Forums : Performance & Racing : DYNO Sheets Results & Comparisons : Difference between dyno machines?
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Old 08-30-2008, 07:59 AM   #1
TeeBone
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Question Difference between dyno machines?

Whats the difference between the dynos that wheel wheels are rolling on and the dynos where the rear wheels are removed and these pods are bolted on the wheel instead?
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Old 08-30-2008, 05:15 PM   #2
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The DynaPack (hub dyno) generally reads a bit higher torque & HP because the inertial load of tire & wheel is removed. They do have excellent control for tuning and you never have to worry about "launching" a car off the dyno if straps break.

Dynojet, Superflow, Dyno Dynamics, and Mustang all use rollers of differing sizes and they all work off the inertial acceleration methodology. All have loading capability for tuning and are much quicker to set up on the dyno since you don't have to remove wheels and consequently worry about retorquing them. You get the real "rear wheel HP" for your car since it is exactly how you drive it on the street.

Traction on the inertial dynos can be an issue on very high torque & HP cars as they tend to "blow the tires off the dyno" but you *can* place load in/on the car to compensate in most cases.
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Old 08-31-2008, 10:00 AM   #3
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Quote:
Originally Posted by DynamicTuningSolutions View Post
The DynaPack (hub dyno) generally reads a bit higher torque & HP because the inertial load of tire & wheel is removed. They do have excellent control for tuning and you never have to worry about "launching" a car off the dyno if straps break.

Dynojet, Superflow, Dyno Dynamics, and Mustang all use rollers of differing sizes and they all work off the inertial acceleration methodology. All have loading capability for tuning and are much quicker to set up on the dyno since you don't have to remove wheels and consequently worry about retorquing them. You get the real "rear wheel HP" for your car since it is exactly how you drive it on the street.

Traction on the inertial dynos can be an issue on very high torque & HP cars as they tend to "blow the tires off the dyno" but you *can* place load in/on the car to compensate in most cases.

Good information, have you seen a car come "launching" off a dyno before?
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Old 08-31-2008, 11:58 AM   #4
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Good information, have you seen a car come "launching" off a dyno before?
more times than i can count! although a good operator will "catch" the car as it starts to crest the rollers and launches completely off.
big HP nitrous cars are notorious for this - the power hits all at once, no gradual build like a SC or turbo car.
it will definitely get your attention arty:
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Old 08-31-2008, 10:40 PM   #5
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Quote:
Originally Posted by Jon@RedlineMotorsports View Post
more times than i can count! although a good operator will "catch" the car as it starts to crest the rollers and launches completely off.
big HP nitrous cars are notorious for this - the power hits all at once, no gradual build like a SC or turbo car.
it will definitely get your attention arty:
What he said... Haven't had one come loose but there is always a first... Had a front strap burned off by a big turbo car once...
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Old 09-02-2008, 06:13 AM   #6
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someone MUST have a video
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Old 09-04-2008, 07:48 AM   #7
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Quote:
Originally Posted by Jon@RedlineMotorsports View Post
more times than i can count! although a good operator will "catch" the car as it starts to crest the rollers and launches completely off.
big HP nitrous cars are notorious for this - the power hits all at once, no gradual build like a SC or turbo car.
it will definitely get your attention arty:
Go over to you tube and type in "dyno accident's", I couldn't find anything major just some imports going sideways.
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Old 09-05-2008, 04:51 AM   #8
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Oops... Guess the operator didn't hear too well when the car was revving and wasn't moving...

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Old 09-05-2008, 05:40 PM   #9
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LOL!!!!!!!!!!! I remember that!!!!!!!!!!!!

That was the guy that hit the car with a 150 shot and couldn't tell it was laying over and blew the motor!!!!!

Howard LOL!!!!!
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Old 09-12-2008, 09:51 PM   #10
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Some difference between dyno's.
Mustangs read low but are a better tuning dyno vs the Dyno jet.
Some dyno jets seem looser than others, then other brands and types can be higher or lower! Best to go the same one to gauge
improvements.
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