NASCAR 1970 Dodge Daytona rear end ratio?

[Dibbons]

I know this is old news but I have a question: On March 24, 1970 Buddy Baker ran 200.44795 MPH during one practice lap at Talladega, anyone know for sure what rear end ratio his #88 Dodge Daytona used that day? Tnank you.

 

[Photon440]

Interesting question. And I don't know either. However while testing the earlier Charger 500 to 194 mph in 1968, Buddy used both a 2.94 and 3.07 ratio. The 2.94 was about 1/5 mph faster. If I had to guess, he'd use the 2.94 in the slipperier 1969 Daytona body.

 

[kiwigtx]

Interesting question. And I don't know either. However while testing the earlier Charger 500 to 194 mph in 1968, Buddy used both a 2.94 and 3.07 ratio. The 2.94 was about 1/5 mph faster. If I had to guess, he'd use the 2.94 in the slipperier 1969 Daytona body.

I agree here....the car would need extra tall gears to keep the RPM manageable at that speed. The Daytona was certainly slippery enough to not have tall rear gears hinder the performance much.

 

[Dibbons]

Two trial MPH and RPM statistics:


Input Parameters Are the Following:

• Differential Gear = 3.07 to 1
• Transmission Gear = 1.00 to 1
• Tire Diameter (Inches) = 28.00
• Vehicle MPH = 200

Computation Results:

• Computed Engine RPM is 7371

Input Parameters Are the Following:

• Differential Gear = 2.94 to 1
• Transmission Gear = 1.00 to 1
• Tire Diameter (Inches) = 28.00
• Vehicle MPH = 200

Computation Results:

• Computed Engine RPM is 7059

 

[Dibbons]

One more trial:

Input Parameters Are the Following:

• Differential Gear = 2.71 to 1
• Transmission Gear = 1.00 to 1
• Tire Diameter (Inches) = 28.00
• Vechicle MPH = 200

Computation Results:

• Computed Engine RPM is 6507

 

[Photon440]

Two trial MPH and RPM statistics:


Input Parameters Are the Following:

• Differential Gear = 3.07 to 1
• Transmission Gear = 1.00 to 1
• Tire Diameter (Inches) = 28.00
• Vehicle MPH = 200

Computation Results:

• Computed Engine RPM is 7371

Input Parameters Are the Following:

• Differential Gear = 2.94 to 1
• Transmission Gear = 1.00 to 1
• Tire Diameter (Inches) = 28.00
• Vehicle MPH = 200

Computation Results:

• Computed Engine RPM is 7059

Pretty much bang on to Buddy's results - he found a 300 rpm difference.