Another Cooling Fan and Octane Question

[RTfuninCO]

I didn't see the answer I was looking for so I thought I would post my question.

I am a noob when it comes to the tuner but here is what I have. 07 Charger all stock except for the Mopar CAI.

Question #1: After installing the 91 CAI tune my fans run all the time. What settings should my fan settings be? Also should I install a 180 or 190 thermostat, and then what setting should I use.

Question #2: I live in Colorado at an elevation of approximately 5280-5800 feet. We only have octane rationgs of 85, 87, and 91 due to the altitude. I have been told 91 is the same as 93 at this altitude but I would actually like some real tech advice before I blow up my car.

Question #3: Since I do live at a higher altitude are there any other settings I should adjust to help compensate for the lack of air density since I read about everyone else lighting up the tires and mine barely squeak. Although I have definitely seen great results with the Predator.

Thanks for the help.

[smoke74]

get a 180 tstat and set the fans around 190
i wouldnt try to run lower octane than recomended

[magnuman]

I live at about 3000 ft. elevation and routinely run 91 with the 93 tune. I have a Dashhawk and monitor knock retard. I get no knock retard with this setup. I use real gasoline too, not the reformulated, or ethanol laced stuff. The type (brand) of fuel you use definitely can make a difference, too. The thinner air will normally make things a little richer at WOT, but at light throttle (closed loop operation) the O2 sensors and PCM maintain the mixture at about 14.8 to 1 AFR. In the old days I was taught that there is about a 4% change in AFR for every 2000 ft. increase in elevation. Don't know it that's right on today with wideband analyzers, etc. Also, air temp. humidity, and barometric pressure have an impact on mixture. Where I am the DA usually runs around 4000-4500 ft. at the race track in the summer. You may want to try and use the datalogging feature to get an idea where you're at.

As far as the thermostat goes, I run a Napa 190 degree unit. Mine runs 184-187 on the highway, and will get up over 200 in the summer (100-110 degrees). That will now be controllable/adjustable with the Predator.

[crazylikeacharger]

without changing the thermostat with the canned tune your high fans will be on all the time when you get up to temp my settings were as follows

ac off
High MPH HS 226.39
High MPH LS 217.39
High MPH MS 226.39

Low MPH HS 228.39
Low MPH LS 217.39
Low MPH MS 226.39

ac on
HS 226.39
LS 217.39
MS 226.39