Dyno numbers very low, HELP!

[Kong76]

Why kinda Dyno was the car on?

Most dyno jets show the 2018 stangs between 402-420ish HP and 390's torque.

On a stock car you do not have 450-460hp to the wheel, nobody does.

It appears he has a GT350 so yes he should be around 450-460.

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[Kong76]

Uhh no.. Why don't you go dyno it in different gears, say 4 / 5 / 6 .. your talking single digit number difference in torque.

Your horsepower is your HP.. The gear doesn't give you more HP... its just a gear! Go to a dyno shop and ask them.

1:1 ratio is best which is 5th gear
Here’s why… Working with a gearbox whilst a high input/output ratio gear is selected, 1st gear for instance, causes the effects of gearbox temperature variation to become amplified. This is due to running with greater relative bearing surface speeds along the path taken inside the gearbox by our driveline energy, these higher surface speeds increase our exposure to things like oil windage and metal on metal friction.

Conversely all of these temperature related variables will have the least effect upon our driveline energy when the gearbox is operating with little or no input/output ratio, the ideal ratio logically being that of one to one, where the relative speeds along the driveline energy path are minimised

 

[stangman638]

1:1 ratio is best which is 5th gear
Here’s why… Working with a gearbox whilst a high input/output ratio gear is selected, 1st gear for instance, causes the effects of gearbox temperature variation to become amplified. This is due to running with greater relative bearing surface speeds along the path taken inside the gearbox by our driveline energy, these higher surface speeds increase our exposure to things like oil windage and metal on metal friction.

Conversely all of these temperature related variables will have the least effect upon our driveline energy when the gearbox is operating with little or no input/output ratio, the ideal ratio logically being that of one to one, where the relative speeds along the driveline energy path are minimised

It really doesn't matter, I have the 10 speed auto and dyno in 3 different gears, want to guess the numbers difference? Wasn't exactly the same but pretty damn close.

 

[Phenom5.0]

It really doesn't matter, I have the 10 speed auto and dyno in 3 different gears, want to guess the numbers difference? Wasn't exactly the same but pretty damn close.

Then you're arguing two entirely different transmissions lol

 

[mkonrad]

Those numbers are way too low; run at another shop, use 5th gear for consistency, and read up on the dynamometer your shop uses. A different make of dyno will load the engine differently and have different numbers. In the early days of 2016 motor trend did their dyno testing, and even ran it on their head 2 head video.

You’ll find countless dyno runs on M6g, but if you want a baseline for ‘good’ you can start here
https://www.motortrend.com/news/dyno-battle-gt350-gt350r-and-camaro-z28/

Mine read pretty close to Motortrend numbers on a Dynojet.

 

[SVTinAR]

The HP is calculated from the torque reading so if the gear it's in makes a difference in the torque readout - it will affect HP also.

 

[Stunt1o1]

Those numbers are low for any dyno, a Dynojet in particular. Did they happen to dyno any other cars that day for comparison? How high did they rev it?

They ran a lot of cars that day. He rev it out to 8200rpm.

 

[Stunt1o1]

Those numbers are way too low; run at another shop, use 5th gear for consistency, and read up on the dynamometer your shop uses. A different make of dyno will load the engine differently and have different numbers. In the early days of 2016 motor trend did their dyno testing, and even ran it on their head 2 head video.

You’ll find countless dyno runs on M6g, but if you want a baseline for ‘good’ you can start here
https://www.motortrend.com/news/dyno-battle-gt350-gt350r-and-camaro-z28/

Mine read pretty close to Motortrend numbers on a Dynojet.

I plan on taking it to another shop soon.

 

[jlauth]

1:1 ratio is best which is 5th gear
Here’s why… Working with a gearbox whilst a high input/output ratio gear is selected, 1st gear for instance, causes the effects of gearbox temperature variation to become amplified. This is due to running with greater relative bearing surface speeds along the path taken inside the gearbox by our driveline energy, these higher surface speeds increase our exposure to things like oil windage and metal on metal friction.

Conversely all of these temperature related variables will have the least effect upon our driveline energy when the gearbox is operating with little or no input/output ratio, the ideal ratio logically being that of one to one, where the relative speeds along the driveline energy path are minimised

5th gear would be ideal but on these cars that gear is way too tall to dyno the car. My good friend owns his own dyno and works for Derive. He also has a GT350. We Dynoed my car in both 4th and 5th. The only difference was that he let out before the top of 5th because on a loaded dyno the gearing is just too long. The pull goes up to like 150-160 mph at the top of 5th at 8200. So typically you would dyno a GT350 in 4th.

 

[JT1]

The dyno "knows" the speed and it "knows" the engine RPM so it calculates the HP correctly regardless of what gear the car is in.

However, what gear the car is in does affect the number slightly.
Ideally putting the car in the gear that is 1:1 is best because in that case, the input shaft is coupled to the output shaft, and you aren't transmitting power though the gear faces, which going through the gear faces does have a very minor effect due to inefficiency.

Also on an inertia type dyno, the quicker the pull, the lower the number. This is because the car is accelerating both the driveline and the rollers, with the HP number being what was left over to accelerate the rollers.

Imagine you dyno the car in first gear, the pull would last about a second, so the net HP would be lower because it would be missing the HP it takes to accelrate the driveshaft, differential, half shafts and the reat tires from the beginning speed to the end speed in the very short duration of the pull.

In a pull that takes longer due to the car being in a higher gear, the HP to accelerate the driveline will be a smaller percentage of the cars total output relative to accelerating the rollers, since the pull took longer. I don't think I'm doing a very good job of explaning this part, but hopefully you get the idea.

 

[Demonic]

I don't see mentioned anywhere also whether you're quoting the SAE or STD calibration? Do you have the full read-out to post?

Why kinda Dyno was the car on?

Most dyno jets show the 2018 stangs between 402-420ish HP and 390's torque.

On a stock car you do not have 450-460hp to the wheel, nobody does.

Sounds like you're referring to the GT, not the GT350.

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