Electrical fan suppose to come on with the AC on no matter what the temp is.
If its running with the AC on its most likely the mechanical fan clutch.
When you are cruising the air flow from your speed will keep radiator cool.
If you are idling or moving slow in stop & go traffic you will heat up...
Tuning for 87 octane would be to get rid of ping if you have detonation......will be no performance increase at all.
HP & torque tune increase would be advance timing with added fuel/air from the higher octane fuels. More octane=more timing=more power
If its the exhaust you should be able to simulate noise/vibration with the throttle while in park.
If it only makes noise/vibration while moving its mechanical.
Nope, not backwards
More pressure when MDS solenoids are open on deactivates lifters
https://help.summitracing.com/knowledgebase/article/SR-05428/en-us#:~:text=The%20computer%20shuts%20off%20fuel,This%20%E2%80%9Cdeactivates%E2%80%9D%20the%20lifter.
Looks like a good 1
https://www.rockauto.com/en/moreinfo.php?pk=5929440&cc=1502255&pt=10147&jsn=359
Mopar $200 more
https://www.rockauto.com/en/moreinfo.php?pk=6427467&cc=1502255&pt=10147&jsn=360&optionchoice=0-0-1-1
Ok, just seen the end of that video you linked.
I see how MDS on creates more flow to those areas.
How about about writing me a tune to keep my MDS solenoids on to help lubricate my non-MDS cam/lifters without a cell........LoL
I'm a little confused also if this info is correct from Summit Racing.
So MDS solenoids are open when MDS is activated allowing oil pressure to decouple lifters.
MDS solenoids are closed when all lifters/valves are working on all 8 cylinders.
So how can this be bad on stock engines?
I can see...
I'm willing to bet this week's paycheck the solenoids still there.
I didn't buy the plugs & I'm sure Petty's didn't give them to me for free.
From the videos I have seen they pretty much break off trying to remove.
No possible way to look under intake with borescope to confirm MDS solenoids haven't been replaced with plugs I assume???
But then the cable is fed under & mice can get into chew so maybe you can?
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