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Old 04-16-2021, 03:56 PM   #11
Dano
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Default Re: Best gear for 9.90

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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?
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Old 06-10-2021, 06:48 AM   #12
Charlie Yannetti
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Default Re: Best gear for 9.90

In my combination, the gear change didn't seem to affect my reaction time.. I didn't change any numbers in the box..
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Old 06-10-2021, 09:10 AM   #13
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Default Re: Best gear for 9.90

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Originally Posted by Charlie Yannetti View Post
In my combination, the gear change didn't seem to affect my reaction time.. I didn't change any numbers in the box..
No improvement on my cars reaction either with a 4.10 to 4.57 change.
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