Sponsors Fuel Economy Tunes, are they for real or BS?
09-07-2006, 05:26 AM
#1
Sponsors Fuel Economy Tunes, are they for real or BS? I have noticed on this board a few times and mainly on the Performance Trucks board that some sponsors are offering Fuel Economy tunes and some even offer 87/93 Octane tunes.
Are these tunes for real or just good marketing?
If they really do work, what is changed in the PCM, Timing in cruising cells and adjusting O2 switchpoints?
Also, how can you have a 87/93 octane tune with higher compression engines like ours? Do they use the low octane timing table to give you a "87 Octane Tune"?
Are these tunes for real or just good marketing?
If they really do work, what is changed in the PCM, Timing in cruising cells and adjusting O2 switchpoints?
Also, how can you have a 87/93 octane tune with higher compression engines like ours? Do they use the low octane timing table to give you a "87 Octane Tune"?
09-07-2006, 07:20 AM
#4
Slowhawk - On a long highway trip I don't see how TM and shift points can help gas mileage, but increasing timing in the cruising cells makes sense. What truck was it and what mods does it have if any?
Ok, but with what tweaks to the PCM?
Originally Posted by RUTAN TA
Bill, on average you see about 2-3 mpg increase.
Ok, but with what tweaks to the PCM?
09-07-2006, 03:43 PM
#5
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Originally Posted by Slowhawk
Ussually tuning a truck bring's up the fuel mileage.Just the simple stuff like TM,shift point's,and timing works. I gave my wife's truck a 5 minute tune and it gained an average of 3MPG and ran alot better/quicker.
09-07-2006, 04:30 PM
#6
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If you raise the PE enable TPS/MAP points you will stay out
of heavy fuel consumption more, around town. You will have
to move the spark around, run less advance below PE kick-in
in the moderatge-MAP areas. Generally more advance is
more efficiency (more time to burn & expand, per stroke)
as long as you stay out of ping. You can fiddle the O2
switchpoints downward for a small degree of lean-out in
closed loop. Changing shiftpoints to kick up earlier at
light throttle will improve economy some, fixing the
kickdown to something more pedal-proportional will
make that tolerable to drive.
There is a PID for injector flow g/sec that you might like
to observe, when tuning for economy; goal-seek to
the minimum. You could mess the spark around at cruise
with the RTT and see what minimizes the fuel burn rate,
etc. The O2 pivot-points w/ airflow mode, I don't think
are on the RTT menu?
of heavy fuel consumption more, around town. You will have
to move the spark around, run less advance below PE kick-in
in the moderatge-MAP areas. Generally more advance is
more efficiency (more time to burn & expand, per stroke)
as long as you stay out of ping. You can fiddle the O2
switchpoints downward for a small degree of lean-out in
closed loop. Changing shiftpoints to kick up earlier at
light throttle will improve economy some, fixing the
kickdown to something more pedal-proportional will
make that tolerable to drive.
There is a PID for injector flow g/sec that you might like
to observe, when tuning for economy; goal-seek to
the minimum. You could mess the spark around at cruise
with the RTT and see what minimizes the fuel burn rate,
etc. The O2 pivot-points w/ airflow mode, I don't think
are on the RTT menu?
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09-07-2006, 06:55 PM
#8
Originally Posted by Billiumss
Slowhawk - On a long highway trip I don't see how TM and shift points can help gas mileage, but increasing timing in the cruising cells makes sense. What truck was it and what mods does it have if any?
Ok, but with what tweaks to the PCM?
Ok, but with what tweaks to the PCM?
Tuned it with a locked timing table,brought in PE alot earlier for power,deleted TM,raised tranny pressure alittle bit. For the next 10k miles it averaged 3-4mpg gain and it gained 20rwhp on the dyno
She drives 50/50 highway/city. Next mod is either a bigger motor or a procharger.I bet I can get better MPG with a more efficient setup
