A518 vs TF727 RPM/Gear Ratios Chart

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    Author Topic: A518 vs TF727 RPM/Gear Ratios Chart  (Read 824 times)

    Offline ff6849

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    A518 vs TF727 RPM/Gear Ratios Chart
    « on: March 30, 2014 - 02:48:24 PM »
    I built this chart to compare the A518 to TF727 hope its helpful if your thinking about about the conversion.
     
    « Last Edit: March 30, 2014 - 02:49:55 PM by ff6849 »
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    (__________]]]]]}~~~~

    73 440 Cuda'
    915 heads (mild head work, stock bottom end 10/9:1 compression)
    A518 2600-2800 Stall
    4.10 rear gear
    TTI headers with 3' exhaust with  X pipe 
    comp XE274H cam
    Hughes Roller Rockers
    Holley Sniper EFI
    Holley Street Dominator intake
    MSD ignition


    Offline Katfish

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    • Posts: 3733
    • 70 Challenger
    Re: A518 vs TF727 RPM/Gear Ratios Chart
    « Reply #1 on: March 30, 2014 - 03:56:10 PM »
    Ah Excel, my favorite MS tool.
    I'm in the process of the conversion, easy math you can do in your head.

    Since the OD reduces the RPMs by ~30%,  just take 10% of your current RPM, multiply by 3, then subtract.

    Say you turn 3000rpm now,
    10% of 3000 = 300
    300 x 3 = 900
    3000 - 900 = 2100 rpm

    All independent of tire or gear ratio
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    Offline ff6849

    • Jr. Member
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    • Posts: 181
    Re: A518 vs TF727 RPM/Gear Ratios Chart
    « Reply #2 on: March 30, 2014 - 11:33:51 PM »
    I am too getting ready to install one, I think I am liking the 3.91 with A518 seems to provide the best all around set-up. Your final gear ratio is 2.70, I currently have 2.76 rear gear and like it very much on the highway.
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    (__________]]]]]}~~~~

    73 440 Cuda'
    915 heads (mild head work, stock bottom end 10/9:1 compression)
    A518 2600-2800 Stall
    4.10 rear gear
    TTI headers with 3' exhaust with  X pipe 
    comp XE274H cam
    Hughes Roller Rockers
    Holley Sniper EFI
    Holley Street Dominator intake
    MSD ignition

    Offline Katfish

    • Resident
    • *****
    • Posts: 3733
    • 70 Challenger
    Re: A518 vs TF727 RPM/Gear Ratios Chart
    « Reply #3 on: March 31, 2014 - 01:23:32 PM »
    I have 3.73s now, wish I would have stayed with the 3.55s
    Modern low profile tires are shorter than the old 15 sizes.

    I have 275/40/18s in the back, only 26" tall.
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    Offline 360FISH

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    • Posts: 705
    • BS23H3B567746
    Re: A518 vs TF727 RPM/Gear Ratios Chart
    « Reply #4 on: April 01, 2014 - 12:44:37 AM »
    I'm running the 3.73 gear and it's been great for long cruises with the 518 OD and still has pop off the line.   :burnout:
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    1973 ‘Cuda   Semi-Pro Touring
    360 SB - 518/OD auto tranny - FAST EZ EFI - Edelbrock Fuel sump - HHR fan
    Hella H4 headlights on relays - 97 Dodge Avenger seats - Chin spoiler - Bumpers pulled in to ’72 offset

    Build: http://www.cuda-challenger.com/cc/index.php?topic=74674.0
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