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| DRR Sportsman |
I'll start out that I'm aware that are a multitude of variables that go into the equation... What sort of 1/8 mile rpm change might one see changing from a 4.11 to a 3.89? 4.40 250 blower car, 34.5" tire, goes 7600 in the eighth at 160. I've changed cam and converter since my last data (converter should be tighter and cam should move the powerband down a few hundred rpm)...the current gear has 12 years on it so i need to change it before the season starts. | ||
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| DRR Top Comp |
Converter is slipping 16-17% now 4.11. It'll slip 18%-19% 3.89. 7400-7450-7500 rpm depending conditions. 1% room for error - tire growth variable. | |||
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DRR S/Pro |
150 max in my opinion, the convertor will do more than the gear change. what converter did you put in it, I have used an 05WAT, 06YAT and an 06WAT. They are all about 250 different. Keeping the Socialists and NEO-LIBERALS at bay with FACTS one post at a time !!! Freedom isn't free !!! Thank a veteran, they will actually appreciate it. | |||
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| DRR Sportsman |
boz- it was originally a 05wat, didn't send it back to abruzzi. It's been into twice since, most recently 30 to 35 degree vane angle change. | |||
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| DRR S/Pro |
are you injected or carb? weight? Keeping the Socialists and NEO-LIBERALS at bay with FACTS one post at a time !!! Freedom isn't free !!! Thank a veteran, they will actually appreciate it. | |||
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| DRR S/Pro |
I would say f going from a 4.11 to 3.89 and changing nothing else you will see around a 200 loss in rpm from 7600 to 7400 but the converter will have the last word! | |||
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| DRR Sportsman |
Carb, about 2050. Need to weight it | |||
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DRR Top Comp |
I have seen gear change work both way. My 66 Nova broke 5.13,used a 4.86 we had a dropped.2 in 1/8.Lil brother had dragster with 496 BBC and changed 4.56.4.30 and 4.86 almost zero change et wise mph changed few. Guess it depends how well rest of combo work together. America home of free. Brought to you by 2nd amendment. | |||
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