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Old 03-10-2009, 12:26 AM   #1
jacky599r
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Default Track day observation

Hi,

Yesterday, i went to my first track day. The idea was just to check out the car's reliability, how it felt when pushed a little hard and have some fun under a controlled environment.
I did a couple of laps and noticed my oil temp went up to a max of 120deg c, oil press was 5 bar, water temp was 105deg c. After a hot lap, during idle, the oil press was quite low and lingered around 1.5 bars.
So, i was running in the track and worried that my engine was in risk of blowing up / suffering from serious damage.
May i ask if the readings were normal? Do i need to get worried?
I'm surprised to know that the stock cooling system actually kept up. However, when i pop the bonnet, i can distinctly hear a hissing sound coming of the coolant reservoir. Is that ok?

i have 100mm wisecos with rings
eagle rods
cosworth main bearings
sti rod bearings
cometic 1.04mm HG
amsoil 15w50 dominator racing oil
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Old 03-10-2009, 10:45 AM   #2
mick_the_ginge
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Oil Dry Sump Goodness

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Oil - 120 C = 248 F which is the max I like to run but it's pretty common to run the oil far hotter. You are running good oil. the hotter the oil gets the thinner it gets which is why you see lower oil pressure at idle when hot. 5 bar = 72 psi which is a good and healthy oil pressure.

Coolant - 105 C = 221 F which is also the max I would ever like to see but again not out of the ordinary for a track session.

Remember that the oil is part of the cooling system, IMO it's actually more important than the coolant.

Do you have an external oil cooler? If not this would be a good upgrade to make.

Like I said IMO these types of temps are pretty usual on the track.
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Old 03-10-2009, 02:13 PM   #3
jacky599r
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yo. I do not have an oil cooler and am looking for one with a thermostat as this is my dd. I wouldn't want it to affect oil press or what so ever. With regards to the oil temp, i'm hitting temp like 100 or 102 during daily driving. And during the track, it just took me 2 laps to get 120. I'm just thinking i'm running way too hot. But no idea what's wrong, if thats the cape.
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Old 03-10-2009, 02:18 PM   #4
jacky599r
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oh. Is it alright to hear a hissing sound from e oil reservoir area too?
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Old 03-10-2009, 07:41 PM   #5
Patrick Olsen
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120C is not a problem at all for oil temps. Even with the factory oil cooler I've seen as high as 130C when really pushing my car hard, and it's just a N/A EJ25 without a turbo to heat up the oil.

Pat Olsen
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Old 03-11-2009, 12:49 AM   #6
jacky599r
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Alright, but even for a normal street driving u hit 100deg?
how abt the hissing sound that i mentioned? normal?
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Old 03-11-2009, 01:12 AM   #7
mick_the_ginge
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Default Changed my mind

The hissing would be coolant bubbling in turbo I expect.

100c is a little hot on the street, are the fans on? fans should be on at that temp
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Old 03-11-2009, 01:57 AM   #8
jacky599r
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o, ok so its totally fine to hear the hissing sound? i got worried and thought somewhere theres a leak. phew...
Ya, 100deg c constantly! That got me worried. Ya, the fans are on no doubt...solutions? troubleshoot tips? It got hot ever since my rebuilt. Dont know what have change...could ignition timing got to do with anything?
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Old 03-11-2009, 03:53 PM   #9
madmax718
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Run a lower t-stat. How's ambient temps there? I know it gets hot in singapore!

Subarus will shed a lot of heat through its oil- so its vital you get an oil cooler of some sort in there.
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Old 03-12-2009, 12:30 AM   #10
WRX 2002
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What track were you running at in Singapore?, or was it across into Malaysia!.
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Old 03-12-2009, 09:53 AM   #11
jacky599r
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Wahaha, yeah it gets real ****ty out here. say 33deg c normally? and 90% humidity? it sucked big time to have a climate like this.
Yup, and i went all the way up to Sepang International Circuit, the track used for F1s.
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Old 03-12-2009, 02:55 PM   #12
WRX 2002
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Quote:
Originally Posted by jacky599r View Post
Wahaha, yeah it gets real ****ty out here. say 33deg c normally? and 90% humidity? it sucked big time to have a climate like this.
Yup, and i went all the way up to Sepang International Circuit, the track used for F1s.
I go to Singapore & Malaysia 4 times a year and never seen or heard of a track in Singapore.

I have been go-karting at the Sepang track (or the go-kart track at the same complex) and other places around Malaysia so I figured it must be up there some place.
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Old 03-12-2009, 07:10 PM   #13
wrxsti.l
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I live in Australia and temps in Summer get up over 40deg C and when they do I see 100-105deg C in traffic with AC on. When ambient is around 35deg C my temps never go above 98deg C (fans come on at 98deg C and then the temps drop back to 92deg C).

Also, even on the hottest days in summer, when the temps are 45deg C, at idle, the temps will never go above 98deg C (again, the temp the fans switch on) - if you car is going over the point that the fans switch on while idling, you most likely have an air pocket in your coolant system and will need to burp it out.

Definately get an oil cooler installed, you might be ok with it having a thermostat built in since your ambient temps are pretty high most of the year - i know many ppl down here (Australia) that have them without thermostats and have had no problems - possibly because it is fairly hot here too).

If you can't finb an oil cooler kit with a thermostat built in, just buy any that suits your budget, and then go buy a perma-cool remote oil thermostat and use it with your oil cooler kit
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Old 03-13-2009, 04:59 AM   #14
jacky599r
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wrxsti.l the temps you were refering is water temp right? This is wat i thought as this is my daily encounter. 98 fan on and dropping to abt 90. However, it sometimes lingers ard 94. I think this is due to e t stat not being there and coolant passing e rad too fast. E question will be oil temp. Now that i know for a track day its alright to see such high temps. But my daily driving can cause 100 deg or slightly more; that is wat i don't understand. Also does the 2.5 motor run hotter? I'm seriously looking into an oil cooler with a t stat since its my dd.

Last edited by jacky599r; 03-13-2009 at 05:05 AM.
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