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
>
-- Shadowcatcher Imagery http://members.tripod.com/~shadowcatcherimagery/index.htm
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 12:16:44 EDT