Dissapointing results switching to 7" converter

[S/ST 3040]

Originally Posted by Ed Wright

I have two friends that went to 7" converters in their SS/GT carbureted cars. Already fast, sorted out cars. Both picked up everywhere. I decided I had to have one of those!
Two 7" iterations later, my 8" ATI was still quicker and faster. Depends on the combo, like many other things. Or, I'm doing something very wrong. A strong possibility. LOL
LT1 SS car, 3 speed.

Could race weight and RPM range of the two examples be factors in the 7" converters working? Thanks

[FED 387]

7 inch convertor typical stall is in the 6000-9000 RPM range

8 inch convertor typical stall is in the 4000-7000 RPM range


Where is your peak power? If its in the lower end of those ranges a 7 will not help you

[Ed Wright]

Originally Posted by S/ST 3040

Could race weight and RPM range of the two examples be factors in the 7" converters working? Thanks

I'm thinking so. Both lighter cars, both with Quadrajets, both rev higher than mine.