Max Safe oil temp??
 

Hi guys,

I've another track day this friday, and have recently fitted a DEFI 3 gauge hood with oil temp, pressure and boost.

Im running fresh 15w 50 mobil fully synthetic oil, and wondering when on track, at what oil temperature do you need to start cooling things down again? :wonder:

Its a Jap 03 twin scroll sti, with 3' turbo back de-cat, green cotton filter, and remap.

Cheers

I have seen 115 degrees whilst running, but that soared to 125 on a cool down lap... needless to say I bought a thermostatic oil cooler the next day.

HTH

dunx

Ohhh, 125, nice!

Mine usually sits about 92-95 and when pushed for a few mins on the road goes to just under 100.
Certain its gona be higher on the track though!

I've Already done 1 track day (wet) before I had the defi's and about 2,000miles after a full rebuild with .5mm over bore with omega pistons and acl's.
In the 2000 miles, i hadn't noticed it using any oil, but since the track day its been using a bit.......:brickwall
If that was a result of oil gettin too hot, i dont want it happening again!

Got a catch tank?

Yep, but it only ever catches a tiny bit of oil, mixed with condensation, so the end result is yellow sludge!

Done about 3,000 miles since rebuild an there might be 100-200ml of sludgey stuff in the catch can.

I stick to around 110 degs on track before backing off and doing cool down laps. I may let it go to 115 if I am going for it. I always change oil before and immediately after a proper track day.

Never had any problems on over 5 yrs sticking to this regime.

Ok, Thanks Shaun.

Oil thats in it has only seen about 1,000 miles of road use, so i'll go for the track, and change again after that.

PS.
Should i be taking a look at your new Hawkeye thread??
Havent looked since shortly after you bought it!

if you fitted a cooler rad thermo stat, would this help bring the oil temp down?

im using 10/50 and on a motorway at around 80mph it sits just under 100 on the defi. does this sound about right? i also notice that the oil pressure is lower when at idle when it is this hot, compaired to when the oil is 80 deg

Mine idles circa 3.5bar when hot (90degs). :)

Hot it maintains circa 6.75bar at 3k rpm (90degs). :)

Cruising at 80mph (ambient temp dependant) it sits around 90degs. :)

JDM STI without any oil coolers.

Oh yes!! :D

I'll do just that :norty:

The spec C was a lovely car, but the one you've just bought, is the one i'd like the most!
Grey, slightly more understated than the white or WRC blue, and the hawk is lovely

Thank you for those comments Sir! :)

Just back from a 1/2 day at Mondello on friday.
The car went flawlessly all day, and could survive 15-20 mins of track at a time before the brakes started to feel a little less firm, but never went spongey!

Defi's read 120C on the oil temp once, and i backed off, and they very quickly came down to 110 again. Generally they hung around 115 and didnt go any higher than that.
I have my oil temp sensor on the top of the block, under the IC & turbo outlet pipe.

Another surprise, I had a set of spare rims that i got with the car, which had a set of "Nankang ultra sports" on them, and they actually stood up pretty well to about 190km's on track, and are still road legal after it!
They did start to go off a bit on the front end towards the end of the day, but not bad at all for a set of prob £60 tires!

The temps. you see vary according to where the sender is located. Where yours is, will show a pretty true temp. I had the sender in an adapted sump plug and woud see 90deg as a normal road figure. When I had work done on the car including a return to sump catch can, the sender was re-located close to the pump and my normal figure now hovers around 100deg. On track I was seeing 120+ deg. after 3 laps of Bedford.
A good quality full syn. oil should be fine at these figures.

JohnD

At the moment I'm using Mobil 15w 50 fully synthetic.

Not sure if its regarded as a "brand name" like millers etc, but At the moment i can get 5L for about £40, so its good value for me.

I'm not convinced that returning catch can to sump is a great idea.
I often find the oil has gone quite like sludge due to the condensation that gathers in the can on cold starts. Then this mixes with the oil and makes for a really horrible combination!

However having emptied it before going on track, and emptying it just after, the oil that came out was perfect.

If your engine breathes like a 100 a day 90yr old, then it IS a great idea. ;)

Horses for courses.

Does anybody see a problem with the following-

ej20 2.2, sti version4 heads, gt30 turbo, 450bhp

OIL - 10-40 semi, temps - idle average - 180F , normal running 200Fish, using turbo, and brief spurts of thrashings - 220F, motorway driving around 100mph , 4000-4200k revs - 230ish F...

but...

Oil pressure, when hottest {230ish} on idle will sit at 20. Is this safe????

those temps. seem fine. 220F is a bit over 104C which is ok. 230F (110C) is still ok but, I'd be happier with a full synthetic 10/40 in the sump!
Although 20 psi is a little bit low on average, it's more important what the pressure is at the running revs. If you're seeing 80psi or above at 3000rpm, it seems fine. As it's a re-built engine, you could have slightly larger bearing clearances?

JohnD

my temp sensor on gauge was set at 120 so i go to that then back off.

Thanks for reply mate, yeh once revs go up the pressure is instantly up, and it only drops to 20 on the very hot side of things aka 230+ [never seen 240], normally its 27ish once really warm.

I'm just curious of a fully in there as for weight etc, maybe losing some horses.

What would you say is the danger level with 10-40 , maybe 250F??

Some info in this thread

https://www.scoobynet.com/general-te...-ignition.html


Steve