Custom MPG tune?
Thread Starter
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Sit. Stay.
Joined: Oct 2001
Posts: 18,308
Likes: 20
From: Washington State
Custom MPG tune?
(I'm kinda hoping for the 5-star tuning guy to chime in. 
)
So I'm driving my Excursion today and I got to thinking... (dangerous)
GM has recently made the injector shut-off strategy more "aggressive" on their new trucks. I notice mine shut off when coasting down steepish hills or if I've been coasting awhile. But there is no real set pattern that I can discern yet. BTW, my Scan Gauge II will display 9999 in the MPG field when they shut off.
Do you think this parameter can be changed to make it a bit more aggressive and do you think it would yield any positive results?
What would be the downside?
)So I'm driving my Excursion today and I got to thinking... (dangerous)
GM has recently made the injector shut-off strategy more "aggressive" on their new trucks. I notice mine shut off when coasting down steepish hills or if I've been coasting awhile. But there is no real set pattern that I can discern yet. BTW, my Scan Gauge II will display 9999 in the MPG field when they shut off.
Do you think this parameter can be changed to make it a bit more aggressive and do you think it would yield any positive results?
What would be the downside?
Postmaster
Joined: Oct 2006
Posts: 4,171
Likes: 12
From: SE Texas
(I'm kinda hoping for the 5-star tuning guy to chime in. )
So I'm driving my Excursion today and I got to thinking... (dangerous)
GM has recently made the injector shut-off strategy more "aggressive" on their new trucks. I notice mine shut off when coasting down steepish hills or if I've been coasting awhile. But there is no real set pattern that I can discern yet. BTW, my Scan Gauge II will display 9999 in the MPG field when they shut off.
Do you think this parameter can be changed to make it a bit more aggressive and do you think it would yield any positive results?
What would be the downside?
)So I'm driving my Excursion today and I got to thinking... (dangerous)
GM has recently made the injector shut-off strategy more "aggressive" on their new trucks. I notice mine shut off when coasting down steepish hills or if I've been coasting awhile. But there is no real set pattern that I can discern yet. BTW, my Scan Gauge II will display 9999 in the MPG field when they shut off.
Do you think this parameter can be changed to make it a bit more aggressive and do you think it would yield any positive results?
What would be the downside?
JL
Former Vendor
Joined: Sep 2000
Posts: 2,627
Likes: 76
From: South Carolina
That’s an excellent thought nothing dangerous about it. 
Johnny is correct those Coasting Fuel cut off parameters can be changed to be more aggressive but go too aggressive and you loose some smoothness when off/on go pedal.
When modifying on those parameters its best to make small changes to see how vehicle performs.
Some of the things that effect when coasting fuel cut off is activated and deactivated are:
MPH
Load
RPM
Close Throttle
Coolant Temp
Johnny is correct those Coasting Fuel cut off parameters can be changed to be more aggressive but go too aggressive and you loose some smoothness when off/on go pedal. When modifying on those parameters its best to make small changes to see how vehicle performs.
Some of the things that effect when coasting fuel cut off is activated and deactivated are:
MPH
Load
RPM
Close Throttle
Coolant Temp
Postmaster
Joined: Oct 2006
Posts: 4,171
Likes: 12
From: SE Texas
On a V10 truck there are only minimal gains in economy. But there are HUGE gains in power/driveability improvement with no loss of economy with a proper tune.
JL
JL
Freshman User
Joined: Dec 2007
Posts: 36
Likes: 0
With a tuner? If so, which one?
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Postmaster
Joined: Oct 2006
Posts: 4,171
Likes: 12
From: SE Texas
It's not so much the tuning device as it is the person making the files on that tuning device.
JL
JL
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Postmaster
Joined: Oct 2006
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From: SE Texas
JL
Senior User
Joined: May 2007
Posts: 446
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I now have confirmed that a good tune can help. We took a 750 mile run around western MT over the weekend. Averaged 2.5 mpg on the trip. Ranged from 12.1 bucking a wind to 13 on a tank that probably only saw 70 mph a couple times but included quite a bit of stop and go stuff.
With stock tune the windy run would have been in high 10s or low 11s. 13 mpg was just a dream. Never happened. The 5 to 10% increase is a nice bonus. Will pay for the tuner in about one year. Best part is still the performance.
With stock tune the windy run would have been in high 10s or low 11s. 13 mpg was just a dream. Never happened. The 5 to 10% increase is a nice bonus. Will pay for the tuner in about one year. Best part is still the performance.
