[ThatBlue'22]

I put 89 for daily but was wondering if I can put In 93 to make more power

 

[davewear]

I put 89 for daily but was wondering if I can put In 93 to make more power

Won’t hurt anything except your wallet, wont make any difference.

 

[Tin Foil Hat]

The computers won't allow it to make a difference like in the old day when high octane would overcome a pre ignition knock

 

[wvhemis]

Mid Grade is best for the 5.7's. As Tin Foil Hat stated when I race my Supercharged 14 Shaker I get to the track with about an 1/8 of a tank then add about 4 gallons of race gas. It really does not add any power but it does keep my knock sensors from retarding the timing.

 

[DDC]

I put 89 for daily but was wondering if I can put In 93 to make more power

@ThatBlue'22 Yes you can run 93 Octane all the time and it will not hurt your 5.7L. No, probably will not make any more power than 89 Octane. the 5.7L HEMI is tuned for 89 but will run on 87.

I fill up at Sams or Costco 95% of the time and they only have 87 or 93 octane. I've had my '21 TNG for 16 months now and had a 2011 CrewLux with the 5.7L before that.

 

[bjd223]

People who say it won't make a difference are assuming a lot.

It depends where you live in regards to sea level. The closer you live to sea level the more octane you need (and the more power you will make).

Get a Bluetooth OBD2 adapter and an app on your phone to read it.

Look at knock retard and timing advance. If you are getting knock retard increase your octane from 87 to 89 then 91+.

If you have less knock retard (therefore more advanced/higher timing) you are making more power.

If you live at a really high elevation you might be able to run 85 or 87 with little to no knock retard.

 

[va-terps4]

+1 for using 89 and saving your money. Octane does not make power. Octane simply reduces the tendency of a fuel to knock. That's useful if you want to increase compression, but the 5.7 can't do anything to make use of octane ratings higher than 89.

 

[RobF]

Waste of money. Unless the car is tuned for 91, you will see no power increase.

 

[bjd223]

Waste of money. Unless the car is tuned for 91, you will see no power increase.

Its not about making "more" power it's about not losing power. I live in PA USA and on a hot summer day my truck pulls timing on 89 due to knock.

If I go up to 91 I see less knock retard, and more advanced timing but not enought to make me pay the difference.

If you want the best possible performance you need to not assume what is going on and just look at the OBD2 readings.

 

[va-terps4]

Actually, for the OP, it was precisely about making more power.