3.6 engine and 87 octane a no-no

Johnbuz

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Sounds like a lugging issue, or the OEM tune is too advanced at that spot.

Anyone with a tune have this issue?
About the lugging, yes, 1 mitigation is to wind out the motor more and always keep the rpm above 2k. It helps but there are times where it's not easy to maintain the higher rpms on hills and in traffic. Its funny how the Jeep rides like a truck, is high up like a truck, but the engine is really not like a truck.





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Petey

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It's worth mentioning that camshaft overlap and VVT play a pretty big part in the effective compression ratio.

Also timing advance can be the cause of pinging.
agreed
 

1quick1

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Not sure how mine hasn't exploded on 85 yet :fingerscrossed:
 
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Petey

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Not sure how mine hasn't exploded on 85 yet :fingerscrossed:
U live in high altitude area I wager . I don't recall stations selling anything lower then 87 here in so. fl.
 

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U live in high altitude area I wager . I don't recall stations selling anything lower then 87 here in so. fl.
It's true. Most higher altitude places have 85 or 86. Going from 85 to 87 here is often .30-.40 cents higher. Everywhere else I've lived has been 87, 89, 91 and 93.
 
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Petey

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It's true. Most higher altitude places have 85 or 86. Going from 85 to 87 here is often .30-.40 cents higher. Everywhere else I've lived has been 87, 89, 91 and 93.
In high altitude , ur engine intake has some volumetric losses . It's less likely to go lean. Hence u only need the cheaper stuff.
 

Tread4Lo

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What I don't understand is the hate on people that say they run the higher octane gas. Not hurting anybody but themselves as we are the ones spending 60-70 cents more a gallon (or at least here in NETX).If you all get by with 87 or lower, that is great and I am glad you are able to spend less. I am not in the boat saying 93 is cleaner or whatever for my engine.

I just DISLIKE to hear the rattle the pinging produces and the 93 cleans it up considerably. Yes, the factory tune is the culprit for the ping. Whether it's running too lean OR the fast upshifts (which cruising thru town I can be in 6th and only going 30-35mph), I don't know.

Either way, I'm tuning this 3.6l to get more efficiency with the 93 I am running. If I'm paying for it, might as well get more power, more torque, more mpg's.
 

TheRaven

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WHY IS THIS THREAD STILL GOING?!?!

This has got to be one of the most confounding phenomena inherent to online car forums...every single site has the same thread, and it NEVER DIES. I know of a site for a car that hasn't been built in 24 years and the thread STILL RAGES!!!

What I don't understand is the hate on people that say they run the higher octane gas.
The hate isn't for people who run premium. The hate is for the people who insist that you MUST run premium or you will destroy your vehicle. No one cares if spending more on your fuel helps you sleep at night...we all have funny quirks like that...you do you. But stop bugging me about it. Ya know?
 

Johnbuz

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For me its a therapy session because I can't force FCA to make the factory tune better. 😊
 
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Petey

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Sounds like a lugging issue, or the OEM tune is too advanced at that spot.

Anyone with a tune have this issue?
WHY IS THIS THREAD STILL GOING?!?!

This has got to be one of the most confounding phenomena inherent to online car forums...every single site has the same thread, and it NEVER DIES. I know of a site for a car that hasn't been built in 24 years and the thread STILL RAGES!!!



The hate isn't for people who run premium. The hate is for the people who insist that you MUST run premium or you will destroy your vehicle. No one cares if spending more on your fuel helps you sleep at night...we all have funny quirks like that...you do you. But stop bugging me about it. Ya know?
You're welcome
 

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I occasionally run non-ethanol, and that beats em all. Honestly, before you worry about octane (and you should not), worry about this. Oh, I get better mpg too, suspect the engine runs cooler by about 6 degrees too.
 

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