Location: Australia Goldcoast, QLD temp = 20-28 degree C nearly all the time

With no oil cooler current oil temp on built 6MT engine, Tredstone TRV185 20x12.5x3.5 FMIC, E85, 3582GT ST using 10w40 oil is around
http://www.treadstoneperformance.com...rcooler++720HP


95 degree on a cold day on highway
98 degree on warm day on highway
102-105 degree if sitting in traffic
110-112 degree if boosting here and there
120 degree if actually going through the mountains boosting and high revs

Using mishimoto dual pass 19 row oil cooler mounted next to FMIC so it was getting direct air from the fog light grill area brought the temps to (from memory)

95 degree on a cold day on highway
98 degree on warm day on highway
100-105 degree if sitting in traffic
105-108 degree if boosting here and there
110-115 degree if actually going through the mountains boosting and high revs

My question.
Once i change turbo kit im hoping to get Sashas kit , he uses a
25 row oil cooler behind a larger 25"x9"x3.5" intercooler.
http://www.majesticmotorsportsinc.com/trv259-s.html

Which is better (power of T4 6266 ~ 500-550/600max)
1. Larger FMIC (Core Size 25.00" X 9.00" X 3.50") + 25 row generic oil cooler behind the FMIC

2. Smaller FMIC (Core Size 18.48 X 6.00 X 3.50) + Dual pass mishimoto 19 row at the front / side getting direct air flow


Option 3.
Smaller FMIC and 25 row mishimoto behind the FMIC

Option 4.
Larger FMIC and 19 row mishimoto behind the FMIC (no longer room at the front to have the 19 row oil cooler)

Thanks !

 

From what I know oil has an optimal temperature at/around 210*F to 215*F (~100*C) so your daily driving doesnt concern me but your high boost/high load runs would worry me.

If it was me I would run what Sasha tells you to run. Consider splicing a second cooler into your equation and tuck it somewhere in the mix. I would look into a long slender cooler that you can tuck on top or bottom of the intercooler.

I run a 12x8x1 off a sandwich plate and then spliced in my turbo feed line after the filter and run a 9"x3"x3" pre-turbo.

 

do you have a pic of that setup?

So what is more important, surface area or air flow ?

 

^look up my greddy tt build thread...I'm in the process of moving the smaller oil cooler into passive air (needed to buy additional hose/fittings and didnt have the cash).

both are important...seeing that you have high temps during more aggressive driving stints I would tell you that air flow will play a bigger role.

I would seek guidance from Sasha ultimately - He has tons of experience in this matter. I would also look into Corky Bell's book maximum boost - there's some good stuff in there about thermodynamics and heat transfer.

 

why are you even bothering to change your intercooler? Just keep what you have and keep your cooler setup the same. Saves you money and time.

YOu certainly dont need that bigger intercooler for a single 6266.

You start stacking coolers, and your radiator is the last one get any flow. Avoid stacking.

 

^ agree, keep what you have and try to place the oil cooler in the path of direct airflow. Mine sits mostly behind the intercooler but it works fine, especially with the strong SPAL fans pulling air through both (in fact, I cover my oil cooler during the winter as the oil temp never gets warm otherwise). Oil temps max around 100 degrees C is a good target. If you are routinely exceeding that target, consider changing the oil line size to a bigger diameter or repositioning the oil cooler for better airflow (try right in front of the fan so it gets max airflow when fans are on). Changing line size from -8an to -10an made a huge difference for me.

 

@dash (not being argumentative) but whats the advantage going to the larger hose?

I'm not looking to add any additional drag on my system but is adding a second oil cooler (in my case or the OP's) but is there ever a concern that adding addition lines/coolers will negatively effect the overall efficiency of the oil pump?

 

a larger hose will flow more oil to the oil cooler per unit time and increase the efficiency of your oil cooler. I presume you are using a thermostatic sandwich adapter, which flows more oil to the cooler when oil is hot. The downside of those thermostatic adapters is that if you have too much resistance in the piping, you'll get very little flow to your oil cooler. Although that is better than having your oil flow stymied by a long length of narrow hose. Your oil pump will be able to pump more easily with a larger hose - no worries there. Oil pressure and flow is usually not a problem with our cars...

If you are running hot, try a bigger hose. Trust me. (and report back with findings!)

 

yes, excellent point on the hose raj... depending on the bumper, the oil cooler can be placed to the sides of the FMIC, as I did...I had not much choice cause I went with 5" core fmic and ran out of room....

 

I have -10 already, i brought a fan shroud which made a big difference but still overheats a tad so will move oil cooler to the side where my foglights where (removed now). And getting 6466 now so got the APS IC.