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Old 04-21-2014, 03:39 PM   #1
Kjanracing
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Injected Engineering tune and 180* thermostat results.

I wanted to share some thoughts and results on the Injected tune and 180* thermostat install results. As far as the Injected tune goes, I'm very happy. I've been running the 91 octane setting. More top end power and the torque curve through the rpm range is much improved. I mentioned in an earlier post about my dislike of the cooling fan running all the time, even on a 18*F morning with the heater on. Totally unnecessary in my opinion.
I flashed back the STOCK setting to see what coolant temp ran with the stock fan programming. First off, the temp gauge in the dash is more of an idiot light than a guage. It is running in the middle at about 56*F and is still there around 220*F. So if you ever see it moving past the middle, the engine is running seriously hot. Ok, so stock, the engine runs pretty hot. The cooling fan turns on around 215-220 and off around 212*. I saw temps pretty much in the lower 200*s driving at highway speeds.
Flashed in the 91 Octane tune. When the engine is warmed up, the fan pretty much runs all the time. Coolant temp runs right around 195-200. Injected says they are targeting a 190* coolant temp. The cooling system with the stock thermostat just wont' run that low. Injected also said the the fan turns off at highway speeds (see thread 211 in Tuning Solution (Injected Engineering), I haven't found that to be the case for my car. So it looks like the fan programming is really suited for running a 180* thermostat?
I ordered the Kool Power 180* thermostat from Injected. With my thermostat assembly out and laying on the bench, side by side with the new one from Injected, I noticed the lower radiator hose snout is shorter on the new housing. I tried installing it but with the short snout, the radiator hose is pushed against the top alternator mounting bracket. So I removed the the old thermostat body from my OE housing and swapped in the new thermostat body from the Injected unit. (I don't know if all the units Injected is selling are like the one I got, or if I just got lucky. Check to be sure before removing yours. Swapping the thermostat bodys isn't a big deal, but if you are paying for OEM fit, you should get it.)
With the 180 stat and 91 octane tune, coolant temp is definitely lower. I see right around 188-195*F hwy driving at ~ 70-80* outside air temp. Long downhills it will cool to ~ 180*.
Back to cooling fan operation. I think the programming could be a lot more realistic. I do think it is prudent to run a lower coolant temp with the tune. They could set an ON temp at ~205*f and off at ~200. With a 180* stat, set on temp at, say 195 and off at 190* coolant temp. There is no reason to run the fan lower than 190 if the air conditioning compressor is off, not that I can see anyway. The fan programming has been an issue for discussion starting about 1.5 years ago-see above mentioned thread 211 and earlier.
Injected has a very good product, and with revised fan programming to reflect what the car can realistically do, it would be a great product.
Injected Engineering, are you listening?


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Old 04-21-2014, 04:02 PM   #2
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It sounds like your only problem was your tune was set for a 180 thermostat but you didnt have one

You are correct Fans need to be set for about 205-208 to come on about about 195 turn off

Tom
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Old 04-21-2014, 07:04 PM   #3
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any reason you want to run the engine cold? you get better fuel efficiency (possibly power) running at the temperature the engine was designed for. unless it was highly, highly, modified I'm questioning the need for the extra thermal buffer
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Old 04-21-2014, 10:22 PM   #4
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Quote:
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It sounds like your only problem was your tune was set for a 180 thermostat but you didnt have one

You are correct Fans need to be set for about 205-208 to come on about about 195 turn off

Tom
Tom, the fan is still running at around 180ish degrees. I don't know what the off temp is. I'm sayin the fan still runs when it really doesn't need to. It doesn't cycle.
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Old 04-21-2014, 10:31 PM   #5
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any reason you want to run the engine cold? you get better fuel efficiency (possibly power) running at the temperature the engine was designed for. unless it was highly, highly, modified I'm questioning the need for the extra thermal buffer
The theory is that a cooler engine temp will be less prone to detonation, you can run more spark advance, and the fuel octane requirement is lower, to name a few. Those are a few points regurgitated constantly. The other side mentions decreased clearances, increased friction, thermal efficiency....
Can you point me to any links to support your argument? Very interested.
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Old 04-22-2014, 12:35 PM   #6
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any reason you want to run the engine cold? you get better fuel efficiency (possibly power) running at the temperature the engine was designed for. unless it was highly, highly, modified I'm questioning the need for the extra thermal buffer
He stated " Coolant temp runs right around 195-200 " which is right where you want the engine to be running ,why do you feel that is cold ?

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Old 04-22-2014, 12:36 PM   #7
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Tom, the fan is still running at around 180ish degrees. I don't know what the off temp is. I'm sayin the fan still runs when it really doesn't need to. It doesn't cycle.
Fans on at 180 wont help anything and will just ware things out , rob HP and MPG

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Old 04-22-2014, 01:32 PM   #8
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Right. I don't understand their thinking on the fan programming.
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Old 04-22-2014, 03:35 PM   #9
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any reason you want to run the engine cold? you get better fuel efficiency (possibly power) running at the temperature the engine was designed for. unless it was highly, highly, modified I'm questioning the need for the extra thermal buffer
not this again
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Old 04-22-2014, 03:35 PM   #10
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Right. I don't understand their thinking on the fan programming.
sounds to me like you need to have tom tune your car to your liking
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