1 BLOWN V8

iTrader: (17)

Hey all:

What is the differance between a tune on a regular dyno to a fully loaded dyno.

I was told you get a better tune and more accurate but teh numbers will read lower on a loaded dyno. If so what is the percent between the two?

Thanks

TA-Swede

iTrader: (4)

From what I've understood, the loaded dyno simulates the increasing load on the car as the speed increases (aerodynamic drag).

This should translate better into what the car will see on the road, compared to an inertial dyno that has a constant load all the time.

The "percent" difference (it's not actually a linear difference) varies, as from what I've understood, you need to tell the loaded dyno a bit about your car before you do a pull, such as aerodynamic drag coefficient, weight, etc.

So, the difference between loaded/inertial for a 84 T/A and a 02 T/A will be different as well.

But, yes, the loaded dyno will show the lower numbers.

1 BLOWN V8

iTrader: (17)

But, yes, the loaded dyno will show the lower numbers.[/QUOTE]

That is what I was told also but the only thing I did not ask is how much of a loss is it. Lets say I was to go put it on a regular Dyno how much more would I see in HP and Torq? Is it 5% or more or less?

Thanks again for the input

TA-Swede

iTrader: (4)

The amount of loss would be dependent on what make/model car you're dynoing, as the load (and thereby the loss) is calculated by vehicle weight and aerodynamic properties.

I have no idea what the difference (or even a ballpark figure) for 4th gens would be, sorry.

Bird

iTrader: (25)

On all the vehicles that I've done / seen done, the average is aournd 9 %.


Bird

Tuner@Straightline

I would say an acceptable difference between a loaded dyno and an inertia dyno would be between 6% and 9%.

YellowToy/A

iTrader: (1)

Get some one to tune it on the steet. Dynos are for braging. You can do a good 3rd gear run and stay below the speed limit.

edcmat-l1

iTrader: (10)

Dynos are also for dialing in a car without crashing or getting a ticket.
Most all LS cars are gonna do 100 or more in 3rd gear @ 6000.

BuffJoeyD

iTrader: (2)

+1 Especially when you are tuning a 3 speed =) or something with 6700 rpm redline.

I street tune almost all the cars I see- but that is mostly due to the fact that they don't need that 100% dial in. We spend time at the track and on the street as a street car- Most Cars I see need more tuning outside of WOT.

edcmat-l1

iTrader: (10)

I street tune everything too, but I make the cut off 4200 or so. Even at that, in third, most cars are doing about 70 mph.
Most of the time, the street tuning I'm doing is for idle, return to idle issues. Nothing remotely close to WOT.

gametech

iTrader: (1)

That may be true if you are tuning golf carts, but not much else.

YellowToy/A

iTrader: (1)

And I thought everyone had 6 speeds and at 3.90 gears or more. Must be just the people I know. We do a good 3rd gear run getting on the high way on ramp. Lets see a golf cart do that. And we save alot of on dyno fees.

speedracer5532

iTrader: (8)

You get the most accurate WOT fueling tune on the street. I just tuned a h/c camaro on the street and then went to dyno the car to see what the numbers were on a Mustang load bearing dyno and first pull the A/F ratio was 13.4 to 13.6. So if the car was tuned on the dyno, it would be richer than you want on the street.

Z28luvr

Does anyone know where I can get a street tune done in the Georgia/Atlanta area?

gametech

iTrader: (1)

I agree that a street tune is the best tune, but even with a 6 speed and 3.90's, a tall tire or high rpm cam puts you above the speed limit. The method I prefer is to do driveability tuning on the street, then "rough in" the WOT on the dyno. After that, the final tune happens on the strip. This isn't something you can do as a business, but it is by far the best way to get results. I have had way too many "oh ****!" moments tuning on the street.

Frost

iTrader: (45)

Actually, it quite is, and prices need to go up. I am at Richmond Dragway every Friday street night, and various other times as well as at VMP, MIR, and a back road near you.