One thing I forgot to mention, we both have 5.2L engines.
Skip
Skip wrote:
>
> I don't know about on a dyno, but I just got back from Carlsbad Raceway,
> where I ran side by side with another Durango. He has JBA headers,
> Quick D intake, stock TB and a Dynomax muffler/3" pipe cat back. I have
> JBA headers, Quick D intake and 51mm TB and Borla cat back. The only
> run we got in nest to each other, I ran .3 and 2 mph faster. I know it
> is a small sample, but it is also real world.
> Skip
>
> Holloway,Frank T wrote:
> >
> > FYI,
> >
> > The TB's used for both the 5.2 & 5.9 are the same and the computer has been
> > tuned for each respective engine. Throttle bodies should be interchangeable.
> > The problem with the larger bores on both engines is the lower velocity
> > through the bores. The MAP is a speed density setup. When you open up the
> > bores, the MAP sees a lower velocity. The bottom line, you get less peek
> > horsepower with larger bores. We have verified this on two dynos. You can
> > tune for the larger bores but this requires special programming in the
> > computer. If you don't believe, take your truck and do a comparison on a
> > dyno between a stock TB and a larger bore TB.....
> >
> > Frank
> >
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