Why do people say the 5.3 Vortec is slow?

[Ilikemtb999]

Someone is confused about octane vs energy density.

 

[Boatguy272]

I just couldnt buy a 5.3 knowing the 6.2 was out there LOL

 

[Ilikemtb999]

My engine choice was solely based on the vehicle it’s wrapped in. Cam, tune, headers should help me out some.

 

[kbuskill]

this will keep the octane high 91 while being the cheapest price the $aveing at the pump as well

flex fuel is HIGHER octane hence being burned faster then say 87, flexfuel engines can output more power then the normal ones.


91 octane will be the best balance between gas mileage, power and costs /.. not if you are getting straight 91/93 which cost more.

this is only recommended if you have flexfuel don't do it on non flex fuel..


It's really bad when you keep switching between the two as the computer will keep needing to adjust for the fuels. that can rob fuel mileage

you can mix them E85 just means you can use upto e85 fuel. it can be E30 E50 etc..


to get the 91 octane it's 3 gallons of e85 for every 10 gallons of 87octane pumped

so every fill up it can save about 9-10$ over getting just 91octane



if you want 93 octane
8.75 gallons e85 to 17.25 gallons of 87 octane
about 53% e85 & 47% 87octane

All of this ^^^^^ assumes that the ethanol content remains at a constant... which it doesn't.

In order for E85 to be classified as such it simply has to have an ethanol content between 51% - 83%. If you don't believe me take a close look at the pump the next time you fill up.

 

[S33k3r]

I just couldnt buy a 5.3 knowing the 6.2 was out there LOL

6.2? I just have the 6.0...

 

[Boatguy272]

6.2? I just have the 6.0...

So does my daily driver !!!

The Tahoe got a whopping 850 miles logged before it got parked for the winter !!

 

[BG1988]

All of this ^^^^^ assumes that the ethanol content remains at a constant... which it doesn't.

In order for E85 to be classified as such it simply has to have an ethanol content between 51% - 83%. If you don't believe me take a close look at the pump the next time you fill up.

you can ask for a fuel report. at the gas station

 

[kbuskill]

you can ask for a fuel report. at the gas station

You can also see the ethanol content via an OBD2 interface and the Torque Pro app on your phone but only after driving for a few miles... my point was that saying if you add X gallons of E85 to Y gallons of 87 equals Z octane may not always be very accurate.