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Old 04-16-2021, 03:56 PM   #11
Dano's Avatar
Join Date: Oct 2019
Location: Hurricane, Utah
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Default Re: Best gear for 9.90

Originally Posted by Tom Goldman View Post
Like Charlie ,I run Select converters . I went to 4.56 gears from 4.29 in my Vette which weighs in at 2400# .
I picked up 2 mph with an increase of 250 trap rpm .
converter efficiency went from 10% slip to 5-6%. AND very importantly , the converter temperature dropped way down when coming off the stop.
Since Charlie's car is a '27 Roadster, one of the hardest cars to get MPH out of I'm not surprised by the lack of improvement in speed.
I would defiantly recommend 4.56 gears in your car.
Racers get too hung up on trap rpm's , if your engine is still pulling at the stripe ,let it eat !
Did the cars reaction improve?
7071 SST
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