That matches about what we were getting with our EP car a few years ago. 7500
rpm
at the end of the straight at SIR with 4.63 rear and 23.0/9.0-15 Goodyears is
right around 130. It's about a half-mile straight and the 2nd half is uphill, so
the car could have turned more under ideal conditions.
Jsk977@aol.com wrote:
> A question for all the folks reporting top speed. Are these spedo readings or
> are they calculated ? ( variables are overall gear ratio, tire dia. and RPM)
> spedos are notoriousley inaccurate at higher speeds. I'm curious to know
> what rear axle ratios and RPMs everybody was turning.
>
> RPM
> Speed = ______ _________ X Tire Dia.
> 336 x overall gear ratio
>
> Back in the late 60s my C Production Solex would reach around 7000 rpm in 5th
> on the main straight at Bridgehampton (over 3000 ft, but slightly uphill)
> before having to lift for turn one. With a 4.38 rear and 5.00/8.30 x 14
> Goodyear Blue Streak Sports Car Specials with a 23.8" dia. equating to
> 133mph, later with a 4.62 rear it would pull to around 7300 rpm before
> lifting equating to 131.5 mph. If memory serves me right, Bob Sharp was
> turning over 7500 at the same spot.
>
> Jerry Krakauer
> SRL311 - 00099
--
Gordon Glasgow
http://www.gordon-glasgow.org
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