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18.5 only "city" no highway at all - carpool, idling, morning rush hour, city traffic. I haven't made a highway trip in a while. My sport is "loaded" when i pick up the kids:CWL: before i was around advertised 17 city

just so i'm understanding this correctly, the oem setup is designed as a "cold air intake", but when you say "cold air intakes on their own only let you hear the engine more" are you really referring to "aftermarket intakes"? (Since the oem intake is a "cold air intake") also, did you work on...

for sure, but the problem is that between 1,200 rpm and 1,800 rpm is where the best gas mileage is. I'm getting fantastic mileage for what this thing is, and i'd really love to eliminate the knock. That's probably the engineers' problem. tuning for max economy is probably similar to tuning for...

Yes that's right, but that vacuum is going to take the path of least resistance between the two, and the least resistance is going to be the closer one and clearer one, which would be the filler neck. I just threw out random numbers that it might be a 67% filler neck 33% valve cover split. In...

And i can't wait for this to come out https://teraflex.com/2021/07/02/jl-jt-3-6l-crankcase-vent-system-cvs-teraflex-new-product-video/ My thought is that by pulling from 2 points, flow will be reduced - probably more flow 67% maybe from the oil filler neck (cleaner) and 33% behind the valve...

you might be on to another factor. I don't drive my wife's pacifica much at all, but i don't think i've heard hers knock. I might need to drive hers around with windows down and see if i can get it to. I'll check later, but the pacifica pentastar is probably level (since it's transverse), so...

windows down is when i hear it, so i ride around with them down when i'm experimenting

So far so good here. 89 / 5w-30 / mishimoto. 18.5 mpg city/suburb (no highway) on 33's / 3.73's. Rare light LSPI - dramatically reduced from previous i just re-routed my "dirty" catch can line. I noticed that it had a "trap" behind the engine where the line dipped down and then came back up to...

too cryptic :) PV=nRT (ideal gas law) P is measured with MAP sensor V is given n is calculated (solved for) moles (amount of) air R is a constant T is measured with IAT sensor cold air intakes positively affect P and T at high rpm for peak power increase, and they positively affect T at low...

They do work (high rpm / power and low rpm / gas mileage) because they allow more moles into your engine ;)

I've recently switched out my k&n for the mopar filter in the mopar intake. No issues with the k&n, just wanted to check out the dry filter. I'm getting similarly great mileage with both, so i think i'll just keep the mopar dry filter in there

the 5w-30 experiment is to see if the higher viscosity oil results in 1) less oil making by the rings and getting into the cylinders, and 2) less oil making it through the PCV system and getting by my catch can i noticed that LSPI was also gone -right after- i installed my catch can on 0w-20...

it's $0.30 different here, and my fuel is a business expense. And in theory, i should be able to go down to 87 with the same result. I happen to run 89 currently so i wanted to be accurate about that. The 89 part is more about just trying to help out the pentastar with its high compression...

Totally understand that. Everybody's situation is different. For me, i have no confidence in dealership service / warranty work whatsoever, and i'm planning on putting 200k miles on my jt, so letting it ping nonstop and then possibly having an engine issue at 115k miles is not going to work for...

Mine would experience LSPI constantly. Never loud or long, but repeated 3-second long knocking multiple times per drive at low rpm and light throttle. Temperature seems to make no difference - would do it on cool days as well as hot days. Now I've got just over 400 miles on my 5w-30 oil...

Who wants to guess the rear tire pressure?

Whatever they want to call it, all of the LSPI tech articles i've read talk about trying to fix it with oil formulations. So to me, that's the hint that it's related to oil in the combustion chamber. So why is there so much oil in the combustion chamber to the level that causes knock? My theory...

the 5 wouldn't make a change at operating temp, the 20 would still result in the same problem at operating temp. If trying something thicker for science, 0w-30 would probably be it. I'm not recommending -anyone else- run a different weight than recommended by the manufacturer. I'm contemplating...

Engine braking is normal - injectors cut off and you're getting better fuel economy i have the PRND thunk as well. I've found that when the jeep is cold, you're in park and want to shift to reverse (like backing out of the garage), first shift to D at a "medium" speed with the lever, let it...

Referring to low speed pre-ignition, my conspiracy theory is that it has become a new problem due to using 0w-20 weight oil. The oil is thin enough to get into the cylinder in larger quantities, to the point that it is affecting combustion and causing knock High engine compression would make...