Adjusting radiator fan temps

[Wayno]

C to F scale:
88C = 190.4 - t'stat starts to open
89C = 192.2
90C = 194.0 - lower normal operating temp
91C = 195.8
92C = 197.6
93C = 199.4 - upper normal operating temp
94C = 201.2
95C = 203.0 - t'stat fully open
97C = 206.6
100C = 212.0
103C = 217.4

Values in stock tables
A (Assume this is AC on)
197.7 (92C)
203.0 (95C)
201.2 (94C)
212.0 (100C)
B (Assume this is AC off)
206.6 (97C)
212.0 (100C)
210.2 (99C)
217.4 (103C)

VALUES FOR PREVENTING OVERHEATING AT IDLE.
Fans will come on after a minute or 2 at idle after temps start to rise.
194.0
199.4
197.6
203.0

RECOMMENDED:
VALUES FOR FANS ON BELOW 43mph/69kph.
These values will keep your engine bay vented at all times once you're at operating temperature.
Fans will only be on over 43mph/69kph if you're overheating - t'stat fully open, over 203F/95C.
190.4
194.0
192.2
203.0

[Wayno]

Updated

[350matt]

So does anyone know how this translates to the Fan tables in ECUtek?
I've added notess from what seems to work from my own experiments

you have rad fan control - vehicle speed
10
20
64
70
129
135

radiator fan control thresholds #1 ( with AC on I think)
84 = low speed fans off
87 = low speed fans on
86 = high speed fans off
90 = hi speed fans on

radiator fan control thresholds #2 (with AC off i think)
92 = low speed fans off
95 = low speed fans on
94 = hi speed fans off
98 = hi speed fans on


any further information would be gratefully accepted

[mike the snake]

My fans are set to come on early and stay on, so while the car is on, the fans are on. Thermostat keeps the temps stable.

Temps run at 200 regardless of load or speed, never change even one degree.

[Kodename47]

Originally Posted by 350matt

So does anyone know how this translates to the Fan tables in ECUtek?
I've added notess from what seems to work from my own experiments

you have rad fan control - vehicle speed
10
20
64
70
129
135

radiator fan control thresholds #1 ( with AC on I think)
84 = low speed fans off
87 = low speed fans on
86 = high speed fans off
90 = hi speed fans on

radiator fan control thresholds #2 (with AC off i think)
92 = low speed fans off
95 = low speed fans on
94 = hi speed fans off
98 = hi speed fans on


any further information would be gratefully accepted

Have you got access to the thresholds #1 and #2 in ECUtek? I only have the Vehicle speed parameters, which there is little point changing IMO.

Originally Posted by mike the snake

My fans are set to come on early and stay on, so while the car is on, the fans are on. Thermostat keeps the temps stable.

Temps run at 200 regardless of load or speed, never change even one degree.

Not bothered that will wear the fans out prematurely?

[350matt]

Yes I've got access to threshold tables, which I've played with a bit
but do you know what the speed table switch points pertain to?

also leaving the fans on all the time will actaully reduce airflow at high speeds as they can't spin fast enough to match the airflow coming into the rad over 80mph

so you end up creating back pressure due to the fan motion, they definitly want to be off at high speed

[Kodename47]

@Matt350 which ROM are you using? I don't have access on the A01G or any other I've tried in ECUtek, or are you using romraider as well?

[350matt]

I'm on the A01G but you need the ECUtek user level to be set to beta to see the fan temp switch points

So assuming the OFT speed table functionality are same as ECU tek

you have rad fan control - vehicle speed
10 = fans are on below this speed providing the temp threshold in the other 2 table is allowing it
20 = fans will be on if the temp is above the normal operating temp of 93C?
64 = fans will only be on if the temp is above 95C?
70 = ?
129 = ?
135 = fans always off above this speed

question marks indicate I'm not sure so any further information would be helpful

[Kodename47]

Originally Posted by 350matt

I'm on the A01G but you need the ECUtek user level to be set to beta to see the fan temp switch points

How do you do that? Or have you got the full tuner version?

[mike the snake]

I've seen fans free-spinning (fans OFF) in front of the radiator on cars at speeds above 80, and I doubt they restrict flow at high speeds when on, especially if mounted behind the AC condensor, radiator, and intercooler.

On turbo cars especially, the fans need to be on ALL the time, otherwise if they cycle on and off, when off, the radiant heat from the turbo and exhaust gets insanely hot and melts things.

The fans being on all the time keeps air flowing across the hot parts and keeps the radiant heat from melting stuff.

Fans on all the time, thermostat maintains the proper coolant temps, done deal.

Originally Posted by 350matt

Yes I've got access to threshold tables, which I've played with a bit
but do you know what the speed table switch points pertain to?

also leaving the fans on all the time will actaully reduce airflow at high speeds as they can't spin fast enough to match the airflow coming into the rad over 80mph

so you end up creating back pressure due to the fan motion, they definitly want to be off at high speed

[Grip Ronin]

ya ive ran some cheap ebay fans on my civic for at least 4 years set to be on non stop thru the AEM and not once has it gave me an issue. im sure a pair of oem quality fans will hold up fine being on majority of the cars run time

[dejxx]

@mike the snake agreed that keeping the fans on is a must on front turbos like FBM... this is done by Ecutek tuner? Installing a FBM turbo kit soon, and i want my tuner to do exactly what you suggest.
Also, dumb noob question, but... its both fans ON, rad and AC? can you make both stay on at all times? freaking hot temperatures where i live (+100f yesterday, its summer here).
Thanks

[Fizz]

Originally Posted by Wayno

My normal temp range being NA is 194F-197.6F (90C-92C).

I wouldn't lower the temp that the fan switches off below 194F, that's below the engine operating range.

Traditionally fans on over 40mph will be causing less flow than if they're off, so careful changing the highest value (M1 max, M2 min) in these tables.

M0 max(-) - 194 (90C)
M0 max(+) - 197.6 (92C)
M1 min - 199.4 (93C)
M1 max/M2 min - 203 (95C)

What this means is:

M0 - 0 to 6mph (10km/h)
- fans will come on if engine is up to operating temp.

M1 - 6mph to 40mph (10km/h to 65km/h)
- fans will be on if the temp is above the normal operating temp of 93C/199.4F.

M2 - 40mph to 80mph (65km/h to 130km/h)
- fans will only be on if the temp is above 95C/203F.
95C/203F is the temp at which the thermostat is fully open.
(I've only ever seen 95C/203F at idle, never while moving).

M3 - Above 80mph (130km/h)
- fans should be off regardless of temp.

I'm looking at mine in romraider and the "Rad Fan Mode A" is looks odd (to me). It doesn't show the temp, but has 2.0, 2.0, 2.0, 5.0 listed for M0, M1 min, M0 max, M1 max respectively. Any idea why?
@Kodename47 @steve99

[Wayno]

Incorrect definition