2024 torque 3.15 vs 3.55

[BigMustangMike]

I apologize if this has been covered already. I did do a search and was in unable to find any information.
I was wondering if anyone has the torque numbers for the stock 3.15s and stock 3.55s? Just curious as to the difference. Thanks so much in advance.

edit- I’m talking like dyno numbers. I would think the higher the gear the more torque to the wheel 🛞?

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[EFI]

What do you mean by torque numbers? Like how much power they can handle or how much power they put down?

 

[paulm1]

Or how much to torque the pinion nut?

 

[BigMustangMike]

What do you mean by torque numbers? Like how much power they can handle or how much power they put down?

maybe I’m wrong but I would think the 3.55’s would put down more torque to the wheels.

 

[paulm1]

maybe I’m wrong but I would think the 3.55’s would put down more torque to the wheels.

I think you're confusing torque with gear ratio. Torque from the motor doesn't change with rear gear change

 

[WildHorse]

the gear ratio is just a torque multiplier. The actual engine torque doesn't change.

 

[BigMustangMike]

Maybe I’m saying it incorrectly. I know the engine doesn’t change. I’m curious if anyone has dyno’ed 3.55’s vs 3.15’s. Engine hp and tq doesn’t change but I felt the torque difference when I put 4.10’s in my old Mustang. Torque to the wheel changed. Sorry for the confusion.

 

[BigMustangMike]

the gear ratio is just a torque multiplier. The actual engine torque doesn't change.

Exactly. I was meaning how much more torque to the wheels with the 3.55 vs 3.15.

 

[BigMustangMike]

What do you mean by torque numbers? Like how much power they can handle or how much power they put down?

Put to the wheels

 

[Gen3javi]

Maybe I’m saying it incorrectly. I know the engine doesn’t change. I’m curious if anyone has dyno’ed 3.55’s vs 3.15’s. Engine hp and tq doesn’t change but I felt the torque difference when I put 4.10’s in my old Mustang. Torque to the wheel changed. Sorry for the confusion.

With the 10 speed I like the 3.15 gears better I had the 3.55 in before in my previous car the 3.55 hit 7th around 130 and going wot into 7th should be avoided in the 10speed the 3.15 allow for 145-150 before that 7th gear shift
The 3.55 are better for 1/8 mile and 1/4 mile racing until a certain power level because it just shifts so much where the 3.15 pull longer

 

[WildHorse]

Exactly. I was meaning how much more torque to the wheels with the 3.55 vs 3.15.

Well, say the trans is in 1:1 with 400 ft-lbs @ 4000 rpm.
Calculate the torque after transmission ratio:
Torque after transmission = Engine torque * Transmission ratio
Since the transmission ratio is 1:1, the torque remains the same: 400 ft-lbs
Calculate the torque at the wheels (with 3.15 axle gears):
Torque at wheels = Torque after transmission * Axle ratio
Torque at wheels = 400 ft-lbs * 3.15
Torque at wheels = 1260 ft-lbs
Now, let's calculate the torque at the wheels with the new setup (changing the axle gears to 3.55):
Keep the torque after transmission ratio as 400 ft-lbs (since transmission ratio remains 1:1).
Calculate the torque at the wheels (with 3.55 axle gears):
Torque at wheels = Torque after transmission * Axle ratio
Torque at wheels = 400 ft-lbs * 3.55
Torque at wheels = 1420 ft-lbs
So, with the 3.55 axle gears, your engine will make approximately 1420 ft-lbs of torque at the wheels.

 

[BigMustangMike]

Well, say the trans is in 1:1 with 400 ft-lbs @ 4000 rpm.
Calculate the torque after transmission ratio:
Torque after transmission = Engine torque * Transmission ratio
Since the transmission ratio is 1:1, the torque remains the same: 400 ft-lbs
Calculate the torque at the wheels (with 3.15 axle gears):
Torque at wheels = Torque after transmission * Axle ratio
Torque at wheels = 400 ft-lbs * 3.15
Torque at wheels = 1260 ft-lbs
Now, let's calculate the torque at the wheels with the new setup (changing the axle gears to 3.55):
Keep the torque after transmission ratio as 400 ft-lbs (since transmission ratio remains 1:1).
Calculate the torque at the wheels (with 3.55 axle gears):
Torque at wheels = Torque after transmission * Axle ratio
Torque at wheels = 400 ft-lbs * 3.55
Torque at wheels = 1420 ft-lbs
So, with the 3.55 axle gears, your engine will make approximately 1420 ft-lbs of torque at the wheels.

So if the 315s put down 408 pounds of torque to the wheel the 355s will bump it to 459? On a dyno with all things being equal.

 

[WildHorse]

So if the 315s put down 408 pounds of torque to the wheel the 355s will bump it to 459? On a dyno with all things being equal.

No. It doesn't change the actual engine torque.

 

[BigMustangMike]

Ok. I’m just an idiot. My thought premise was you feel torque and with the higher gear you would feel more torque therefore there would be more torque to the wheels.

 

[WildHorse]

Ok. I’m just an idiot. My thought premise was you feel torque and with the higher gear you would feel more torque therefore there would be more torque to the wheels.

There is more torque to the wheels through gearing. Engine torque remains the same. Same principle as using a block and tackle / pullies / etc.

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