I was wondering whether there is any simple way of manually turning the radiator fan on and off. The reason for the question is for drag racing purposes. When I am drag racing, the fan does not come on because usually the engine temperature is below normal operating temperature as a result of waiting in the staging lanes. As the fan, when operating, pulls outside air through the intercooler, if the ambient temperature is 16C (61F) and you were able to manually start the fan prior to having a run so that the IAT is lowered before the run then more power would be produced off the line. My IAT on the start line normally ranges between 100-110F and drops during the run before increasing again before the finish line. With the fan running, I believe the IAT could be reduced considerably. What are your thoughts on this?
Manual Operation of Radiator Fan
- Thread starter Coupes66
- Start date
I've asked for this feature from mhd for a long time, jb4 has it so I cant see it being hard to implement.
I have the same problem, on the street there is no issues but when you wait in line for 15 min to get a run it gets ridiculous.
I have the same problem, on the street there is no issues but when you wait in line for 15 min to get a run it gets ridiculous.
At any decent track, if they see you running your AC and dripping water on the track they will kick you out. So no, turning on the AC is not an option
Since the fan is always getting a full 12volts and is only turned on by DME logic, it is not that simple. This was discovered in the other thread dedicated to this
Since the fan is always getting a full 12volts and is only turned on by DME logic, it is not that simple. This was discovered in the other thread dedicated to this
With sport cooling enabled I get my low speed fan on at 225 degrees. So yeah, if there was a way to tell it 225 degrees from like 170 and up, that would work for me
FMIC would need to be sealed to the rad/fan to make most efficient use of it, otherwise, it will pull air from everywhere else first, not through the core.
Fan can be set to run as high as you want with a flash, but it would take a flash. A/C on is easiest method to run it without flashing. It's a low duty cycle, but better than nothing and easy. You can also try MHD race cooling option (requires flash), which is engine temp, but all cooling (fan, stat, pump) is interrelated and will run the fan higher/more often if the engine is at temp and ambient is over 70F or so (don't remember their trigger point on it).
Those cooling mode targets/triggers can be changed in flash. Not spoofing the temp reading, but lower targets cause bigger control errors to actual temp and larger responses from fan/stat/water pump.
JB4 does something on the CAN directly only to the fan and, as mentioned multiple times already, relay/switch won't work.
Fan can be set to run as high as you want with a flash, but it would take a flash. A/C on is easiest method to run it without flashing. It's a low duty cycle, but better than nothing and easy. You can also try MHD race cooling option (requires flash), which is engine temp, but all cooling (fan, stat, pump) is interrelated and will run the fan higher/more often if the engine is at temp and ambient is over 70F or so (don't remember their trigger point on it).
Those cooling mode targets/triggers can be changed in flash. Not spoofing the temp reading, but lower targets cause bigger control errors to actual temp and larger responses from fan/stat/water pump.
JB4 does something on the CAN directly only to the fan and, as mentioned multiple times already, relay/switch won't work.
The electronics are integrated into the fan controller. The fan already has constant power. Turning it on with a relay would require disassembling the electronic module part of the fan to rewire how it works.
So.... it could be done but this is not a reasonable option. A simple PWM module with a switch or sensor wired into the fan makes more sense but only if option of doing it via can bus doesn't materialize.
My ade650 has fan shroud clips and seals to radiator. I actually think I may upgrade to the 850 watt fan if find a way to enable without jb4
Hmm, I have an extra fan, I'll have to test it out. The 335is 850W fan is the best option, that requires another harness with a relay and such though and it's $$$.
Correct you cant use a relay as the fan is pwm controlled as far as I know.
I looked into it for awhile and there is no easy way apart from disconnecting a sensor or having it on a switch which I think is not a good idea
it could easily be done just like the jb4 has via the obd2 and only use it whilst staging.
I looked into it for awhile and there is no easy way apart from disconnecting a sensor or having it on a switch which I think is not a good idea
it could easily be done just like the jb4 has via the obd2 and only use it whilst staging.
If it's a PWM signal, I would think you could put speed controller on it and control it. What I am not sure of is if this would interfere with the signal from the ECU.
I see a project in my future.
I see a project in my future.
It would me much easier to do a stand alone app just like the e85 fuel-it app but through the obd port
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