dlbb

if you are gonna run 91 or 93 do a relearn. i am on my second tank in my new truck but will do a relearn tomorrow. it is designed to run 87 or better. 91 or better for performance. the relearn just makes it run better imho.

techrep

iTrader: (1)

.50 a gallon more than 87 oct X 36 gallons - not $3 a fill up..

leje0306

How is it better? It's only different. Octane is a measure of the fuels resistance to combustion. Higher compression engines need it because of the higher level of heat created and longer stroke.

leje0306

What is a "relearn"

techrep

iTrader: (1)

.50 a gallon more than 87 oct X 36 gallons - not $3 more a fill up..

GOPHERIT

Since it runs on 87 if I put 93 or even 89 in it would make it idle sorta ****ty ? I been noticing that lately a lot of shaking when I cold start it !

Ricktwuhk

No.

johnday in BFE

iTrader: (1)

I run a MPT 93 Race tune. So, I need 93, imagine that. I can also run E85 with the same tune. A week and a half ago, 93 was $3.10, E85 was $2.00. Guess what I went with. Hint, saved $30+ on a fill up.
Now,it isn't always worth it due to mileage loss, my cut off is $.80 a gallon difference, any less, I use gas.
The power difference is quite noticeable between the two fuels though.

What is a "relearn"

Relearn process = KAM reset. Don't get anymore power, but throttle response is much quicker, until the ECM "relearns" your light footedness. Is that a word?

dlbb

disconnect the battery, negative side first, then turn on the headlights for a min. reconnect the battery positive side first. skip to the relearn process by the face

How to Do an Idle Relearn.
In the event you are experiencing an erratic idle after loading a tune or after performing any action that clears KAM (Keep Alive Memory), an Idle Relearn can help you get back on track.

The KAM or “Keep Alive Memory” is the memory that is stored in the powertrain control module (PCM). This memory contains data regarding idle trims, fueling adjustments, adaptive shifting, and may other parameters. It is constantly updated as the vehicle is driven to account for changes in environment, driving conditions, and even wear on the vehicle.

The KAM is cleared anytime battery power is disconnected from the PCM. Examples would be: disconnecting the battery, replacing battery or battery cables, a dead battery, or a bad ground. Also, many SCT devices contain a “Clear KAM” command in the “Special Functions” menu of the device that will also clear KAM, without the need to disconnect the battery.

When KAM is cleared, or battery power is lost, the computer returns to the base parameters set in the calibration, and loses the stored values it has gathered based on driving habits, inputs, and data collected by the vehicle sensors. When this happens it is sometimes necessary to perform an idle relearn to once again teach the car how to idle correctly.

Follow these steps to complete an Idle Relearn:
With vehicle at a complete stop, set the parking brake.
Put gearshift in "P" (Park), turn off all accessories.
Run the engine until it reaches normal operating temperature.
Allow engine to idle for at least one minute.
Turn the air conditioning on and allow the engine to idle for at least one minute.
Release the parking break. With your foot on the brake pedal and the A/C still on, put the vehicle in "D" (Drive) and allow the engine to idle for at least one minute.
Drive the vehicle to complete the relearning process. Just make sure you drive easy for the first 30 miles, so the PCM can re-learn and adapt to your driving style.
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TexasRedfish

IN GENERAL, the higher the octane, the better. Better mileage, better towing, fuel looses octane while it sits, etc. Even though it's marginal, it's still better. The reason why most people stray away from higher octanes is cost. If 93 was only 10 cents higher than 87, I'm pretty damn sure everyone would run 93.