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Tuning / Diagnostics -- engine and transmission Tune and diagnostics for engines and auto transmission.

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Old 10-01-2012, 05:59 PM   #1
sting808

 
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Tuning radiator coolant fan

I'd like some clarification on tuning Gen5 Camaro fans. I remember an old thread about fan control saying only Vettes used PWM. It was cited that Gen5 Camaro is either on or off. Fan operations was determined by a % threshold for on/off states. My fan does not turn on at 192*. I have a DeWitt radiator with the stock stat and can see peaks above 215 in traffic and wait times between Solo heats. I know the lowest temp to turn on the fan is 192 for OE systems. Would be great to have the fan work at the lower temps.

Is the Camaro PWM or on/off? (regardless of % tuning settings in HPT/SCT)
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Old 10-01-2012, 07:12 PM   #2
Iam Broke
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I don't have the wiring diagrams in front of me but I can tell you the stock tune is set to discrete, not PWM.

I suspect the relay logic is the same as my turbo LNF Cobalt was. Off, 2 fans low in series, 2 fans high in parallel. The fan output table shows 3 states. I have mine set to 91% by 203 degrees to run both fans high.
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Old 10-01-2012, 09:45 PM   #3
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To turn the fans on at lower temps you can either run an upgraded OS from hptuners or put a manual switch on the fan circuit.
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Old 10-01-2012, 10:53 PM   #4
sting808

 
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If the fans are on/off, it seems having the fans come on in the mid/upper 190s would help. I believe 192 is the lowest per OE OS. I do not want the fans on all the time and burn out due to high duty cycle, too. Is there a compromise operation range with the larger radiator?

When cruising, temps are typically 189-192. Water pump at idle may be another factor.

I have a larger radiator, but still seeing higher temps after passes and in traffic.

I hate the fact that my KB reservoir boils over and drips dexcool in the engine bay. I know I need to either go chiller. Or, Torq HE with fans and larger reservoir. I'm trying to avoid the chiller since I need to pull the blower and modify the AC system. IATs of 145-155 needs to be addressed.

I digress...

Is keeping the temps in the mid/high 190s during idling and between heats reasonable? Will it put high wear on the fans?

Mainly street commuting with bi-monthly auto-x use.

*item list is growing*
6-point harness and bar
bigger HE w/fans
bigger reservoir
ID850s
axles
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slotted rotors
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Old 10-02-2012, 04:56 AM   #5
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I know it's debated to no end on the forums, but I would put in a 160* stat and set the fans to be full on by 203*f. The 160* stat in my old LS1 ran 174* in 100* ambient at cruise.

192 24%
196 26%
199 51%
203 91%

It needs to transition through these values to set the fan control modes on rise and fall IMO.
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Last edited by Iam Broke; 10-02-2012 at 06:24 AM.
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