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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 08-14-2018, 01:53 AM   #15
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Originally Posted by stlgrym3 View Post
Why the thermostats all of sudden having problem? Is this because of the header install? According to the log I’m couple degrees below the normal point, will this cause any harm on my car?

couple of degrees is fine if it was like 80c then that's probably not good.
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Old 08-14-2018, 10:52 AM   #16
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No it wasn’t overheating before. Before, the temp was at the midway level, now with the new header after same amount of driving, the temp needle is at the 1/3 mark.
The stock coolant premature sensor is not a good indicator.



Just checked with my dedicated gauge, check the picture out. If you're hanging out at around that mark your thermostat is probably stuck open.

EDIT Disregard the first image I posted. I started the car up and watched the water temperature gauge in relation to the stock cluster. From a cold start to the yellow line in the picture the temp was only 140*F, anything above the line was 140-200*F. The stock gauge would hover at it's half way mark and it would only be 180ish, that extra 20 degrees to 200 didn't move it any farther once it reached half way.


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Old 08-14-2018, 11:06 AM   #17
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Originally Posted by Trueweltall View Post
The stock coolant premature sensor is not a good indicator.







Just checked with my dedicated gauge, check the picture out. If you're hanging out at around that mark your thermostat is probably stuck open.


What do u mean by stuck open? And how do I fix that? Yeah, my temp gauges look about the same as yours.


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Old 08-14-2018, 11:28 AM   #18
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You generally just replace the thermostat if you have one that is stuck open. When it gets stuck open it will take forever for your car to hit operating temperature, I had an eclipse with no thermostat that would never get up to temp when driving it in the winter.
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Old 08-14-2018, 03:02 PM   #19
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Originally Posted by stlgrym3 View Post
Yes it is ceramic coated, but my Tomei header was thermo wrapped as well.
I'm not sure that's a fair comparison. You should post a picture of your previous header's wrap job.
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Old 08-14-2018, 03:28 PM   #20
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I'm not sure that's a fair comparison. You should post a picture of your previous header's wrap job.


That was besides the point. The previous installer whom to be remain nameless did a poor job on the thermo wrapping, but if that’s the reason my temperature gauge is showing lower temp then that’s all fine by me. I’m more worry about the thermostats issue mentioned above, and why it is happening now after the new header install (again, not saying that was the reason, but I’m just curious).


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Old 08-14-2018, 04:50 PM   #21
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Originally Posted by stlgrym3 View Post
That was besides the point. The previous installer whom to be remain nameless did a poor job on the thermo wrapping, but if that’s the reason my temperature gauge is showing lower temp then that’s all fine by me. I’m more worry about the thermostats issue mentioned above, and why it is happening now after the new header install (again, not saying that was the reason, but I’m just curious).


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If anything, it's your tune that is running cooler, rather than the header itself being cooler. The ceramic is superior to a wrap, but comparing a one-size-fits-all OFT tune to a well dialed Ecutek tune is like trying to compare a generic suit from walmart to a custom tailored bespoke suit.

Many people don't realize the effects a tune can have on the car. Just because "it seems to be running just fine", doesn't mean it's running optimally.

If anything, the Ace header should be running hotter, in theory; there's a lot more hot exhaust pipe surface area underneath the hood for heat to radiate from. In reality, there's a ton of different factors that all contribute to a potentially lower coolant temp.

Another one is the fact that you're making much, much more torque than you did before; you don't have to step on accelerator as much to get the same acceleration. If you're burning less gas to get the same torque, you're naturally going to have less waste heat.

Have you noticed a change in fuel economy?
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Old 08-14-2018, 05:00 PM   #22
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I have not driven much to notice the fuel consumption difference yet. But long story short, I’m all fine with car running cooler whether it’s due to the tune or header, it’s a lot better than the other way around. I just want to make sure it’s not a bad thermostat throwing false reading.


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Old 08-14-2018, 06:49 PM   #23
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The coolant temp sensor and thermostat are completely independent of each other. Your sensors are reading accurately.
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Old 08-15-2018, 04:38 PM   #24
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Quote:
Originally Posted by stlgrym3 View Post
I need to pay more detail attention on the temperature fluctuations. The 1/3 vs 1/2 was my general impression after the ACE header and Delicious Tune. But sometimes when the car is parked with engine running, the thermostat does creep up to the halfway mark. But when the car starts moving, it’ll dip below the 1/2 mark. While driving it’s generally between 1/3 and 1/2.

I did check the log I just sent to Delicious Tuning, during the 3rd gear moving log, the coolant temp were between 87-89 degrees, and oil temp were between 97-98 degrees. This log was taken after the car been idled for 15 minutes from a cold start while collecting another set of logs.

If you can see the temperature dropping below half once up to temp, then you most likely have a stuck thermostat. The job of the thermostat is to regulate the engine temp, so if it's fluctuating up and down it's not working properly.
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Old 08-15-2018, 06:38 PM   #25
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Can you not isolate the thermostat by datalogging an extended idle with the AC on and the engine starting out cold?
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Old 08-15-2018, 10:53 PM   #26
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I just did another log after the first revision, this time I did two pulls from 2000-5000 rpm in 3rd gear back to back. I noticed the oil temperature reached upward to 104 degrees toward the end of the pull, is this normal for this kind of test?
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Old 08-16-2018, 08:37 AM   #27
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Originally Posted by pcguru2000 View Post
Did you modify your gauge cluster to show oil and water temperature or is this a new gauge?
No, I took a stock picture and used MSpaint. I have 3 dedicated gauges on a Block8head pod.
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Old 08-18-2018, 10:10 PM   #28
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I just did another log after the first revision, this time I did two pulls from 2000-5000 rpm in 3rd gear back to back. I noticed the oil temperature reached upward to 104 degrees toward the end of the pull, is this normal for this kind of test?
Without an oil cooler? Yes. You'll see higher than that during sustained highway driving.
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