The 3.6L has a very high compression ratio. FCA are trying to control the consequences of that with electronic wizardry. Their software and electronics just do not get it done with 87 octane. On 87 and even on 89 octane when there is some 87 left in the tank, mine consistently stumbles at 1300rpm whether warm or cold. And it is down on power on the highway such as long steady climbs - mine has 35's, so 6th gear is useless on low octane gas. But when I hit a brand like Shell that carries 91 octane, it is perfect. As a result, when I get gas elsewhere, I have to put half 89 and half 93 in which is a pain. Interestly, mine does not seem to benefit from unlimited octane - 93 seems to be more than I need. But 91 does the trick, so that's what I run. Wish I could get away with cheaper, but engine just does not run as well.
2 years and 10 months... getting ready to turn 70k miles on the clock.
Their software doesn't get it done? On the vast majority, it does.
u seem to be pinging right about now.. but I'm lost on the catch can, which I know to be an overflow device. usually used so the intake doesn't take a gulp of oil. Is there another meaning?I posted one meme. One meme only.
Ok, two now. But I couldn't resist.
On a more serious note, you may have finally found a reason that makes sense to me for a catch can.
I take it to mean that maybe the oil vapor going through the PVC was contributing to the pinging and the catch can reduced or stopped it, so the pinging went away. If not the vapor itself, it may have changed a variable or multiple variables enough to stop it. If I had a pinging issue that was difficult to crack, I'd give it a shot. I don't think a catch can does one bit of harm.
It well could be, but I'll defer to him. He said he runs 89 in his Chrysler 300 but not because of pinging, but rather slightly smoother operation, which he said has been verified by NVH measuring equipment during development. For the record, I'm on my 2nd tank of 93 V-Power just to see if I can feel it and so far, I feel nothing different from 87. My butt NVH meter just can't pick it up. She's smooth as silk just the same as with the 87. (The engine is smooth as silk, not my butt. Hope nobody got excited.)
If I were to get one, I'd go with the UPR can. It seems to have a bit more thought put into its design than others. The other major brand talked about around here appears to use a can that can be had from Amazon for a fraction of the cost. It probably works just fine, though. That's just my humble opinion and it is NOT an expert one, at that.
If u didn't have issue with 87 then ur just wasting time+money.. I'm still on my lucas tank. Its not changed still smoother then on plain 87.. I can still hear the rod smacking the journal ever so lightly for a split second upon acceleration but nowhere as bad as it was before. My next fill up will 90+
