Dan, I quess that is the benefit of an O/D with a 3.89:1 diff!
Patrick
At 04:08 PM 2/22/99 EST, DANMAS@aol.com wrote:
>Listers,
>
>ASSUMPTIONS:
>
>a) Car: Triumph Spitfire MKIII
>b) Trans: stock Spitfire 4 speed, non O/D
>c) Diff: stock Spitfire MKIII, 4.11:1
>e) Tires: stock 145SR 13
>f) engine redline: better than stock 6,500 RPM
>g) engine horse power: hopped up - 1million gazillion HP
>
>COMPUTED:
>
>Top speed equals 104 MPH. Triple horse power to 3 million gazillion and top
>speed becomes 104 MPH. Add quadruple superchargers, twin turbos, and nitrous
>oxide, and top speed becomes 104 MPH. Top speed in first is, in all cases, 28
>MPH. 48 MPH in second, and 75 in third.
>
>Let the engine rev to 8,500 RPM, and top speed in fourth is 136 MPH.
>
>With a stock redline of 5,500, top speed is 88 MPH - add a 0.80 O/D, and top
>speed is 110.
>
>Change the rear end to 3.63, and top speed at 5,500 RPM becomes 99 MPH. 117
>MPH at 6,500 RPM.
>
>With a 3.63 S1500 diff, 6,500 RPM redline, and 215/70 tires, top speed is 132
>MPH. 165 MPH with a 0.80 O/D.
>
>etc.
>
>Slightly detune the engine to a more realistic 65 -150 HP, and the top speeds
>may be a bit less in each case.
>
>Horse power is only part of the speed equation.
>
>Take a 4.5 second, 320 MPH dragster, swap the slicks for a pair of 145SR 13s,
>swap to a 4.11 rear axle, use an 8,500 RPM redline, and it will cruise
through
>the timing lights at a sedate 136 MPH (if the engine doesn't explode first!
>In a normal 4.5 second run, at 8500 RPM, the engine in a dragster turns over
>only 637.5 times).
>
>Dan Masters,
>Alcoa, TN
>
>'71 TR6---------3000mile/year driver, fully restored
>'71 TR6---------undergoing full restoration and Ford 5.0 V8 insertion - see:
> http://members.aol.com/danmas/
>'74 MGBGT---3000mile/year driver, original condition - slated for a V8 soon
>'68 MGBGT---organ donor for the '74
>
Patrick Bowen
'79 Spitfire
Jacksonville FL
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