I have the same concerns as yourself which lead me to getting an F&B stage
1... it uses the stock bore size, just thinning the shaft and smoothing and
radiusing the top... the R&D is bored out to 50mm and Tony's is 52mm (from
memory, correct me if I'm wrong) I'm not sure on Jule's, but the root of the
matter is to keep the air speed up... when you increase the bore size, the
air speed through the TB slows, which is generally bad for low end torque...
this is over simplifiying, but for low-end torque, you want to narrow and
lengthen the intake and exhaust paths... just the opposite for high-rpm HP.
I saw Frank's response that dyno sheets are forthcoming... but since I
installed my Stage 1, I feel like the torque is improved.
Gary Shook
>
>I am convinced that a ported and polished TB (whether from F & B, R&D Perf,
>Jules, or home-made) will improve airflow and HP at full throttle. What I
do
>not know is whether the same modifications will improve part-throttle
torque.
> I am particularly interested in towing power, as I put a lot of miles on
>towing a big-block jetboat around the midwest. I'd like to have more
>mid-range punch to help get over some of the hills without ruining my
mileage.
>
>Does anyone have dyno test #'s to show that there will be an improvement in
>low and mid range torque with the installation of a modified TB?
>
>Steve Menendez
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