Joachim Peiper wrote:
> I have a 1990 lx 5.0 5-speed with TFS heads, TFS stage 1 cam, TFS
> Street intake, full exaust, underdrives, cold air and a 190 lph intank
> pump. The car is mostly street driven. Which gear would be the best for
> me? I was thinking 410s but I was going to add a 125 shot of nitrous in
> the future and don't know if that should effect my gear choice.
>
Gear choice is tough, and is determined by a lot of
factors. First off, where does your engine make best
power? Then, where do you drive it the most. If it
makes best/most efficient power at 3400 rpm's, but you
drive mostly at 50-55mph, then 3.73 - 4.10 might be the
best choice. If you routinely drive the freeway at
80-89mph, then a 3.55 gear might be better. If all
you're after is straight line acceleration, then 4.10
or 4.56 might work better for you.
So you have to factor in the cars weight, engine
performance, trans type, converter stall speed, tire
choice, etc, etc, etc.
After that, you just take your best guess and hope
you got it close.
Playing around with desktop dyno and dragstripSE is
helpful to get a feel for things before you spend money.
--
..boB
1997 HD FXDWG - Turbocharged!
2001 Dodge Dakota QC 5.9/4x4/3.92
1966 Mustang Coupe - Daily Driver
1966 FFR Cobra - Ongoing project
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