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-   -   Best gear for 9.90 (https://classracer.com/classforum/showthread.php?t=77335)

Dano 04-16-2021 03:56 PM

Re: Best gear for 9.90
 
Quote:

Originally Posted by Tom Goldman (Post 637969)
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?

Charlie Yannetti 06-10-2021 06:48 AM

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..

Dano 06-10-2021 09:10 AM

Re: Best gear for 9.90
 
Quote:

Originally Posted by Charlie Yannetti (Post 641789)
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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