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Forced Induction Turbo, Supercharger, Methanol, Nitrous


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Old 09-10-2015, 03:19 PM   #29
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Just to add to that I didn't run the thermostat till I put the supercharger on. So I ran for a good... 4 months without it. Maybe more.
And obviously no problems? I thought that the thermostat simply allowed coolant to begin flowing earlier and was in terms of na purposes, a bit overkill.
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Old 09-10-2015, 04:37 PM   #30
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by lowering the coolant temp from the 92 deg C to the 82 deg C with this thermostat, you gain power by having a slightly cooler cylinder head and so better volumetric efficency
you also gain more headroom for spark, so the cooler temperature is well worth having
its probably not much but I bet its about the 3-4bhp mark
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Old 09-10-2015, 04:39 PM   #31
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by lowering the coolant temp from the 92 deg C to the 82 deg C with this thermostat, you gain power by having a slightly cooler cylinder head and so better volumetric efficency
you also gain more headroom for spark, so the cooler temperature is well worth having
its probably not much but I bet its about the 3-4bhp mark
Gottcha, thanks for explaining!
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Old 09-10-2015, 05:19 PM   #32
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The thermostat lowers the engine temp from about 92C to 82C and I believe the spark timing is adjusted based on this. I don't know the specifics but the calibrations are designed around the engine running at 82C not 92C. Is your fan running often by any chance? I wonder if they lowered the fan activation temp too.


Edit: Matt beat me to it.
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Old 09-10-2015, 05:28 PM   #33
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The thermostat lowers the engine temp from about 92C to 82C and I believe the spark timing is adjusted based on this. I don't know the specifics but the calibrations are designed around the engine running at 82C not 92C. Is your fan running often by any chance? I wonder if they lowered the fan activation temp too.


Edit: Matt beat me to it.
The fan cycles normally in summer heat when the ac compressor is on and when at idle.

I did notice last week that my coolant level was super low. After doing reading apparently this is normal and experienced by many 86ers? Where did the coolant go? I have no idea. No leaks on the ground where I park, no leaks around the head gasket, engine bay etc.

Could the absence of the thermostat have anything to do with this? Thoughts?

I topped off my coolant and have been keeping an eye on it and no change as of yet.
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Old 09-10-2015, 06:34 PM   #34
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The coolant levels tend to fluctuate. It's still the normal level. Once the engine runs for a bit the levels will appear normal. But I wouldn't worry about it. We're supposed to have that Super Ultra-mega Blue Ice Omega Coolant or whatever Subaru calls it.
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Old 09-10-2015, 06:39 PM   #35
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The coolant levels tend to fluctuate. It's still the normal level. Once the engine runs for a bit the levels will appear normal. But I wouldn't worry about it. We're supposed to have that Super Ultra-mega Blue Ice Omega Coolant or whatever Subaru calls it.
That was my conclusion too. Still odd because it make you wonder where the coolant goes? I understand that due to heat it expands and contracts, changing the level (normal obviously) but the level was downright low!

Yeah I didn't bother with subaru's bullshit special coolant.
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Old 09-10-2015, 06:51 PM   #36
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That was my conclusion too. Still odd because it make you wonder where the coolant goes? I understand that due to heat it expands and contracts, changing the level (normal obviously) but the level was downright low!

Yeah I didn't bother with subaru's bullshit special coolant.
I didn't either. I just tossed some normal green in my car. I use it for my supercharger too. And I'm not big on fluid dynamics and physics. Unless it involved biomechanics, which then I'm cool haha
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Old 09-11-2015, 04:30 AM   #37
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Just make sure the coolant you use is Silicate free guys!
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Old 09-11-2015, 05:07 AM   #38
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Guys quick question. I have an oil pressure sensor fitted in the top oil gallery next to the A/C compressor. I assume the SC will foul on it? How much clearence is there underneath the SC and the engine?
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Old 09-11-2015, 08:17 AM   #39
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Looks like I will have to move it to the stock pressure switch location.
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Old 09-11-2015, 01:41 PM   #40
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Guys quick question. I have an oil pressure sensor fitted in the top oil gallery next to the A/C compressor. I assume the SC will foul on it? How much clearence is there underneath the SC and the engine?
Let me go take a look.
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Old 09-11-2015, 01:58 PM   #41
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Looks like I will have to move it to the stock pressure switch location.
The fit might be tight...
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Old 09-24-2015, 12:16 AM   #42
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killboydotcom on the tube recently released a Cosworth Fr-s Tail of the Dragons video. Slowmo drifts, not too shabby.
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