What does 4.10 Gears mean on a Dyno
#1
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What does 4.10 Gears mean on a Dyno
I have seen some responses from people on here regarding lossses in HP and TQ on the dyno when done with 4.10 gears.
Exactly why would you lose HP or TQ when on a dyno because of 4.10 gears...Id like to know, As you can see I have a few mods myself including a custom dyno tune and 4.10 gears...
Thanks
Exactly why would you lose HP or TQ when on a dyno because of 4.10 gears...Id like to know, As you can see I have a few mods myself including a custom dyno tune and 4.10 gears...
Thanks
#2
Legacy TMS Member
Good question.....I've been wondering too.
I last dyno'ed at 296/316 and since have added 4.10 gears. What should I expect to see now, all things being equal?
I last dyno'ed at 296/316 and since have added 4.10 gears. What should I expect to see now, all things being equal?
#3
Originally Posted by dcranford
I have seen some responses from people on here regarding lossses in HP and TQ on the dyno when done with 4.10 gears.
Exactly why would you lose HP or TQ when on a dyno because of 4.10 gears...Id like to know, As you can see I have a few mods myself including a custom dyno tune and 4.10 gears...
Thanks
Exactly why would you lose HP or TQ when on a dyno because of 4.10 gears...Id like to know, As you can see I have a few mods myself including a custom dyno tune and 4.10 gears...
Thanks
Hope that helps
The Boss Hog
#8
yes, the engine is producing the same amount of power, but the gear ratio kills the number the dyno calculates. I think it is the same sort of error as if you dynoed in 3rd gear for example. car producing the same power, but dyno numbers are off.
#9
Team Mustang Source
From the Mustang Dyno web page (www.mustangdyne.com) FAQ:
Q:
Why does the dyno show a power loss after a differential gear change (say a 3.42 to 4.10 gear)?
A:
The Chassis Dynamometer measures power that reaches the tires, not Engine Power. Therefore, any changes you make to your drivetrain may result in a change in your chassis Dynamometer results. A steeper gear ratio will provide the following,
1. Higher peak force to the ground
2. Higher average force to the ground
3. Lower top speed (MPH)
4. Higher peak acceleration rate in all gears
5. Lower peak horsepower
The reason you lose your peak hp is based on higher acceleration rates, increased gear mesh/losses, higher tire losses. These will affect your peak horsepower number in a negative fashion. Losing approx. 5% is expected when changing to a significantly steeper rear gear. Engine power was not reduced, power to the ground was. In exchange, you have more force available which is what allows you to accelerate faster off the line. If you enjoy the feeling of Gs forces as you accelerate, you made a wise choice. Do not be discouraged by the peak power numbers—they are just a reference.
Q:
Why does the dyno show a power loss after a differential gear change (say a 3.42 to 4.10 gear)?
A:
The Chassis Dynamometer measures power that reaches the tires, not Engine Power. Therefore, any changes you make to your drivetrain may result in a change in your chassis Dynamometer results. A steeper gear ratio will provide the following,
1. Higher peak force to the ground
2. Higher average force to the ground
3. Lower top speed (MPH)
4. Higher peak acceleration rate in all gears
5. Lower peak horsepower
The reason you lose your peak hp is based on higher acceleration rates, increased gear mesh/losses, higher tire losses. These will affect your peak horsepower number in a negative fashion. Losing approx. 5% is expected when changing to a significantly steeper rear gear. Engine power was not reduced, power to the ground was. In exchange, you have more force available which is what allows you to accelerate faster off the line. If you enjoy the feeling of Gs forces as you accelerate, you made a wise choice. Do not be discouraged by the peak power numbers—they are just a reference.
#11
Originally Posted by SixtySix
Quit bench racing and let your butt decide what you like
Do not be discouraged by the peak power numbers—they are just a reference.
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