Octane question for BB tune

[Texastoad]

I have a 09 yukon 5.3L flex fuel motor...I have signed up for a BB tune in Houston in March. I normally run the 87 octane gas in my Yuk...is that ok for the tune. Should I be running the Higher octane gas? I would think I should do the tune with the 87 octane since thats what I run all the time...Ive had no issues running the lower octane so far

 

[07Burb]

If you run 87 now and choose to run 87 going forward that's fine. Justin can tune to fit your needs and wants. You'll love how your Yukon performs once tuned!!

 

[JennaBear]

You "can" run 87, but there is probably some pinging/detonation going on. For your engine compression, a minimum of 89 is recommended.

You can be tuned for what best suits you, but since you are getting an AutoCal, you can get a tune for the higher octane should you decide to run it.

I would recommend you run a few tanks of 89 and see if you notice a difference. You should see a peppier response as well as better MPGs.

 

[Texastoad]

thanks for responses

Thanks guy

 

[OHSIXX]

Get it tuned for premium fuel and both your and your vehicle will love it
Best bang for your buck IMO

 

[MudnRox]

Get it tuned for premium fuel and both your and your vehicle will love it
Best bang for your buck IMO

X2.......I totally agree

 

[ccapehartusarmyINF.(ret)]

you should only run higher octance gas if the manufacter recommends or youve added forced induction otherwise your wasting your money
the technical reason is higher octane gas is for engines with compression ratios above 10.5:1 typically. so if you have a compression ration above that
higher octane doesnt not mean better it has a higher flashpoint then regular gas.
that engine has a 9.9:1 compression ratio regular is just fine

 

[Texastoad]

flex fuel

My yukon is flex fuel...so doesnt that mean I can run either or fuels???

 

[Big Buttons]

Flex fuel means you can run E-85 fuel

 

[Texastoad]

owners manual says

My owners manual says to use REGULAR unleaded gasoline..octane 87 or higher