Originally Posted by Higgs Boson (Post 5416279)

Alright, here is a screenshot. This is modified. Here is what it means.

Fan 1 comes on at "50"
Fan 2 comes on at "90"

Fan 1 turns off at "25"
Fan 2 turns off at "50"

Therefore

Fan 1 turns on at 196 and off at ~193
Fan 2 turns on at ~202 and off at 196

If my car does not see 190 unless I am sitting still, that means my fans are not On at all unless I am sitting still, and even then it is only Fan 1.

Now, if you are saying the Gen5 turns both fans on and off at the same time (meaning you are not saying the controls are not there, they clearly are) then that's fine, but moot, since my point is not about the fans, it's about the thermostat reducing ECTs at least 10 degrees. I can't tell unless I had programmed the fans to stay off until 230 and see where the temps go with the stock stat with no fans. The fans were always working with the stock stat installed helping to keep the car in the mid 190s. Now it stays in the 180s without the fans. I would consider this a meaningful difference.

I will also add that with a custom operating system, the fan vs ect table is rescaled to 160 degrees which means you can get those fans on even before 192! Cool.

Originally Posted by JANNETTYRACING (Post 5416694)

Ahh, that clears things Up, I normally don't mess with the Fan States and I am fully aware of this table

When you said fan 1 and fan 2 right way I was thinking LS1 style.

Ted.

Originally Posted by JLE58 (Post 5416700)

I was thinknig about Variable speed with the Fans.

Originally Posted by Higgs Boson (Post 5415882)

remember, custom operating system is different than a custom tune. it costs even more to change the OS completely, and it can't be done on every car. for example, there is not one available yet for my car, the specific OS from the factory in my 2012 SS must be re-engineered. there are more than one factory OS in the E38s or any other ECM, per model year. so it can take a while to get a custom OS, and you have to request it. so it is best to check if it is available and then "order it" so to speak w/HPtuners or whoever you use.

if you are sitting in the staging lanes, turn car off, hood up and push it! this is where an electric water pump or manual control of your fans is great. you can turn them on while the engine is off. this will help your ECTs but also your IATs.

Originally Posted by Pro Stock John (Post 5416751)

~Yep I know the difference, I just have a tune. I'm not interested in a custom operating system no hurry to mod up this car that much.

~My fan settings are working pretty good, I had them set up so I would not have to push the car which is hard for one person :). As for the other stuff, maybe some day a fan switch but it's working good. But the 160 stat could be interesting to do in the future, thanks for the real-life experience sharing.