[Original Message]
[Top of Thread]
[Thread Forward]
[Thread Backward] Re: Mileage/Power Improvement After BreaMsg # 4946 of 8004 on Powerstroke Diesel Conference (1)To: Dave, From: Steve Time: Sunday 01-25-98, 04:26 pm
Howdy Dave, I don't recall when the last EPA change
went into effect. 1/1/98 is the very latest. Snap
throttle operation is slower to keep from injecting
full fuel before boost. This eliminates a puff of
black smoke on take off and accounts for the slow
response in the stock Powerstroke and Cummins. Both
can be rectified with an ATS chip for the
Powerstroke or a TST fuel ramp for the Cummins. I'd
give your truck alittle time to get broken in
before I made any final judgements about it. The
mileage sounds about average for an F350 4X4 CC at
70mph. Will it run from 0-60 in less than 15
seconds, and will it run up to the governed rpms?
If so, it's likely not a problem and will loosen up
after a thousand miles or so. We also have cats
under our trucks now that we didn't have before
'95. If it still bugs you, give Ford a visit and
don't let them brush you off. Tell 'em a Dodge
"almost" stayed within sight in your rearview
mirror and you ain't slept since! That should get
'em right on it...
Steve, 95 DC auto 3.54
Laugh alittle, you'll live longer!
On Sunday 01-25-98, 01:45 pm, Dave said:
-I've driven 5 other Powerstrokes, and the worst of
-those got 18.4, with the others all over 19. And I
-haven't seen much of any seasonal variance in
-mileage on my IDI. Given a conservative median of
-19, that leaves me down by 15%, which is rather
-much for my tastes. Again, this is poored than my
-IDI, which consistently runs upper 16s, with a high
-of 17.3. I've heard that DI should yield about 20%
-over IDI, so this definitely has my eyebrows
raised.
-
-To the other person who's responded thus far: I
-can't see snap idle stuff affecting highway mileage
-and top end power. When did the EPA regs affecting
-diesels last change? I know that something occured
-on 1/1/95, but am not aware of anything more
recent.
-
-Dave
-
-- On Sunday 01-25-98, 02:12 am, Dave said:
---Folks,
---
---Just picked up a new '97 F350 CC PSD, E4OD, 4x4,
---4.10 gears. Sadly, it seems to both have less
-power
---and get poorer mileage than my '94 F250 SC IDI
---factory turbodiesel (w/ aftermarket turbine
-housing
---& exhaust), 4x4, E4OD, 4.10.
---
---On other PSDs that I've driven, when tromping
from
---a standing start, you can see the engine rev to
-the
---torque converter's stall speed, and then, over a
---half second or so, feel the boost come on, via
the
---seat of your pants, with a nice satisfying rush.
---This one is much less distinguished in its coming
---onto the boost.
---
---I don't hear any kind of rushing air sound, so I
---don't think that the exhaust butterfly is
sticking
---shut.
---
---At about 175 miles, took it out solo, with an
-empty
---bed, for about 200 miles, out and back, on
terrain
---that gains elevation (1-2000 feet) fairly
smoothly
---over the hundred mile radius, starting pretty
near
---sea level. I got what I consider to be a
miserable
---16.1 MPG, having filled the tank to the brim both
---before and after the run.
---
---On some steeper hills around here, it would
barely
---pull beyond 70 MPH, taking 5-10 seconds to gain
---each additional 1 MPH. My recollection of my IDI
-is
---that it accelerated in that situation at least
---twice as fast.
---
---So, my questions to y'all are: Is this typical
---performance? Anybody else disappointed? Any
---suspicions as to what's up? How much improvement
---can I expect as the engine breaks in, and how
long
---will that be?
---
---TIA,
---Dave
Replies to this message:
|