James,
forgot to mentionthat both exhaust shops I talked too were very reluctant to
put a "straight thru" muffler on my truck unitl they saw the stock Ultraflow
unit. They said that the dodges dont like low back pressure UNLESS its an
R/T (different computer?? I cant verify, but thats what they "surmised")
Sams '95 seemed to go the same way as your truck, He put a high flow 3" cat
on his truck with the exisitng straight thru muffler (ultraflo??) and lost
power and mileage! Changed his muffler out to a huge Ultraflow something or
other and it "fixed" the problem. Your shop didnt say anything?? Sam, can
you verify and add to this??
BKB
-----Original Message-----
From: Bridges, Bruce [mailto:bbridges@alarismed.com]
Sent: Thursday, February 25, 1999 4:38 PM
To: 'dakota-truck@buffnet.net'
Subject: DML: RE: Re-post Mileage Drop
James,
Ive got a 3" all the way with a 3" in and out 16"Magnaflow (JBA headers and
headpipes (sorry not mopar,but an incredible simulation) and my MPG is right
around 16.5 on a "nice" drive... I did the exhaust after the TB, so Im not
sure whats going on, but it seemed to improve my mileage, not reduce it...
Stock my best mileage was around 14.5!
BKB
-----Original Message-----
From: James Thomas [mailto:callisto@flash.net]
Sent: Thursday, February 25, 1999 4:22 PM
To: dakota-truck@buffnet.net
Subject: DML: Re-post Mileage Drop
Com'mon folks, I only got three responses to this post the first time.
There must be more folks than that out there that have some ideas or
suggestions on how to get my economy back. Has everybody else gotten
better performance and economy out of their exhaust work? One last time:
Am resending this message as I did not receive an answer as of yet and
did not know if it had been received. Have done the following to a 1994
Std Cab 4X4, 5.2L, auto, 3.55 gears. Started with a Transgo shift kit
then added Magnecor wires, brass cap and rotor, Champion truck plugs,
MPI Super Street throttle body, K&N FIPK, Mopar Performance SBEC,
DynoMax cat-back (2 3/4in pipe), hi-flo catalytic and new O2 sensor. All
upgrades done within the last month or so. Everything up to the exhaust
work gained very significant torque and throttle response and 3-5mpg
city/highway. The gas mileage increase with the performance gains was
just what I wanted. When the exhaust work was done I lost the mpg gains
and then some. I went from getting 16.5 combined city/highway down to as
low as 14.2. On strictly highway mileage I went from 20.1(best) to 15mpg
at best now. I gained some nice breathability with the
exhaust albeit at a high expense of economy. Has anyone else ever run
into similar mpg problems with a combination like mine? Am wanting to
add an MSD ignition control box and coil soon but would like to get mpg
problems identified first. Any ideas why the exhaust work caused the
mileage to go down?
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