Page 5 of 5 FirstFirst 12345
Results 81 to 92 of 92

Thread: LS2 Fan Logic or lack thereof?

  1. #81
    Tuner in Training
    Join Date
    Dec 2018
    Posts
    20
    2014 Caprice ALL OE components except 160 degree thermostat.
    Played with the first 3 cels
    set them to 30 35 40 and the temps have been steady between 176 and 181

    Is this what you guys mean by 2 bar software?
    If so why don't I have the 163 Cel?

    From the reading and little I understood, both my fans will always be on even on ice cold start up???
    Thanks for your help
    Attached Images Attached Images
    1986 GN Stand alone FAST XFI
    1968 Chevelle Turbo LQ4
    2014 Caprice 6.0 6L80

  2. #82
    Tuning Addict blindsquirrel's Avatar
    Join Date
    Apr 2017
    Location
    Meridian MS
    Posts
    7,451
    If the button is there for the 2-bar then it is not applied. After it's been applied the button goes away.

    There's more to it than just the Desired vs ECT table to determine if the fan/relay should be on or off. You have to look at State vs Desired and Output Control vs State to see what a particular number in a given Desired vs ECT cell will make it do - whether that value will command an output pin on or off.

  3. #83
    Potential Tuner
    Join Date
    Dec 2006
    Posts
    7

    Here is the method to the madness for "a 160F thermostat". (E67 PCM V8). Other system

    Quote Originally Posted by blindsquirrel View Post
    If the button is there for the 2-bar then it is not applied. After it's been applied the button goes away.

    There's more to it than just the Desired vs ECT table to determine if the fan/relay should be on or off. You have to look at State vs Desired and Output Control vs State to see what a particular number in a given Desired vs ECT cell will make it do - whether that value will command an output pin on or off.

    Here is the method to the madness for "a 160F thermostat". (E67 PCM V8). Other systems should be "similar".
    Attached Images Attached Images

  4. #84
    Tuner
    Join Date
    Nov 2018
    Location
    West Coast
    Posts
    196
    Anybody know if the oem computer/bcm is sending 12v constant to the pwm fan? Or does it only send power if there is a signal being sent as well?

    My truck (18 Chevy) and oem uses a single pwm radiator fan.

    after all of the trial and error, I have figured out how to control a single spal brushless via Hptuner with oem wiring.
    However I need to run two 12 inch spal brushless fans go get enough cfm. The single 16 inch wasn’t doing it.
    Cbr is making the new fan shroud with new fans. Just waiting as fast as I can.

    my plan for wiring is to wire the first fan as normal using the oem wire harness...

    but...

    tap the signal wire, and run that to the second fan as well.

    then run a power (12v/red wire) direct to battery (fused of course) and the ground wire to a chassis ground right on the radiator bulkhead.

    It is my understanding that the fans have a continuous power going to them and they don’t do anything unless the signal wire says turn on and how fast.

    or should I tap into the oem fan harness and run a wire from the 12v to a relay, and run a power line from the battery, through a fuse, to a relay, to the 2nd fan?

    that way the power only goes to the 2nd fan of the first fan on oem harness is getting power too?

  5. #85
    Potential Tuner
    Join Date
    Jul 2022
    Posts
    1
    Hello. I?m new to the forum. There is a lot of great information here and I?ve been reading all I can. I?m new to HP Tuners also. I have a 2005 C6 that I recently adjusted the cooling fan set points in the ETC and desired % tables. I have 0 in the 192* column but my fan is running at temps of 181 at up to 17% and sometimes lower without the AC on. Is there an advanced table or setting I can view and make adjustments? The fan is also not operating at the desired percentage that is in the fan table. I searched and found a thread from years ago, but it didn?t have any solutions.
    Thanks
    Matt

  6. #86
    Advanced Tuner Sébast19X's Avatar
    Join Date
    Feb 2008
    Posts
    218
    Quote Originally Posted by RWTD View Post
    Does anyone have any idea why on my C6 (2008 LS3 A6) does the Fan Desired % from the table not actually command that to the fan? ie I'm sitting in my car right now and my ECT is 203 F, but I'm only getting 35% FAN% and 36% FAN Desired% per the Scanner yet my table (below) is calling for 68.x%. Is it a clutch type situation?

    Code:
    ECT	192	196	199	203	207	210	214
    Fan  %	0.0	25.0	46.6	68.3	89.9	89.9	89.9
    Thanks!
    Anyone have an explication for this situation ???
    I'm experiencing the same things . I have since flashed with the 2 Bar patch.
    '08 Black Z06
    PCM Tuned, LG super RAM, AR Headers, Hoosier DR2 295-55-15, MSD Atomic air force intake, Iceman 7.0 cam

    Best N/A E.T. : 8.836
    Best N/A Mp/h : 159.75
    DA for this pass: 0'

  7. #87
    Tuner
    Join Date
    Nov 2018
    Location
    West Coast
    Posts
    196
    There is more than just that one table commanding the fans.

    There is an overall target table, there should be an rpm target table as well.

    I don?t have the 08 corvette tune. But in the Gm tunes I do have (5.3 and 6.2 trucks, and the 3.6 v6 DI) there are a few different tables that all command the fans to kind of target a 203 to 213 or so degree temperature.

  8. #88
    Advanced Tuner Sébast19X's Avatar
    Join Date
    Feb 2008
    Posts
    218
    Quote Originally Posted by fifty View Post
    There is more than just that one table commanding the fans.

    There is an overall target table, there should be an rpm target table as well.

    I don?t have the 08 corvette tune. But in the Gm tunes I do have (5.3 and 6.2 trucks, and the 3.6 v6 DI) there are a few different tables that all command the fans to kind of target a 203 to 213 or so degree temperature.
    So what can I do with Hp tuners to have access to those hiddens table and tune it accordingly ???
    '08 Black Z06
    PCM Tuned, LG super RAM, AR Headers, Hoosier DR2 295-55-15, MSD Atomic air force intake, Iceman 7.0 cam

    Best N/A E.T. : 8.836
    Best N/A Mp/h : 159.75
    DA for this pass: 0'

  9. #89
    Tuner
    Join Date
    Nov 2018
    Location
    West Coast
    Posts
    196
    Check the fan/cooling section of the tune. Also if there is an hvac area.
    I don?t know if there are any adjustments for those in the codes section. But you are going to have to look around.
    Again I?m not familiar with the corvette tune.
    If you want to post your tune here or send me a pm and I can get you my email and I can look

  10. #90
    Tuner
    Join Date
    Nov 2018
    Location
    West Coast
    Posts
    196
    on the 2008 corvette zo6 7.0l tune...The Fan desired vs ect says the fan should be calling for 23 pwm signal at 203

    So what can you do to tune it? You can adjust the tables in the fan portion of the tune.. but my question is why are you trying to?

    if its because the fan is on while you are parked and the ect is 203 then its supposed to

  11. #91
    Advanced Tuner Sébast19X's Avatar
    Join Date
    Feb 2008
    Posts
    218
    fifty, I think you don't get the point at all.
    My commanded fan % through the tune file don't actually match the % fan . 72.5% commanded equal roughly 30% actual.

    423619495_1389123565142425_570222022122619915_n.jpg
    423455161_411044621417130_2108885212944686394_n.jpg

    There is not much more option imho to edit things here ...
    431125153_3691746127704414_7301941771958061951_n.jpg

    If I go through the VCM scanner and I command whatever fan % I want, I get it. Here an example of 40% commanded through the VCM scanner
    430886031_835617311658912_8752300922121233297_n.jpg

    If I put 50% in the 73C cell the fan barely turn 10% or so.

    This guy, also experienced this problem logic.
    https://forum.hptuners.com/showthrea...l=1#post668175
    Last edited by Sébast19X; 3 Weeks Ago at 08:26 PM.
    '08 Black Z06
    PCM Tuned, LG super RAM, AR Headers, Hoosier DR2 295-55-15, MSD Atomic air force intake, Iceman 7.0 cam

    Best N/A E.T. : 8.836
    Best N/A Mp/h : 159.75
    DA for this pass: 0'

  12. #92
    Tuner
    Join Date
    Nov 2018
    Location
    West Coast
    Posts
    196
    What I?m trying to say is there are multiple tables that control fan speed.
    You changed the desired % vs ect but did you change the desired vs ac?

    I bet those are fighting each other and your output control says listen to the ac map first.

    Also, there should be a target temp to rpm map.
    It may be somewhere in the engine or engine diag areas. Check those.
    If they aren?t, but I?d be suprised. Open a ticket and ask them to unlock them.