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      08-18-2018, 04:50 PM   #1
LastMCar
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Epic Motorsports Oil Diverter S65 initial results

Only found a couple threads mentioning this, but I also only looked or like 30 seconds.

Preface: I’m on my second e90 m3, current ride is ess625.
I live in Las Vegas which makes summer driving awful. I hate seeing the oil temp soar into the 230-240 range when it’s 100+ degrees just daily driving. This was also an issue in the N/A S65 I owned previously. I know they run hot and I shouldn’t be that worried, but I was, and it made driving 3 months out of the year shitty.

Experience: CsF radiator in the N/A M3 helped a little. Maybe a few degrees overall and faster water cool down. A great piece, but not as effective as I’d hoped for $500

Research: even guys running the whole csf outfit or alekshop oil cooler complained of marginal results.

Discovery: http://www.bimmerworld.com/Epic-Moto...it-E9X-M3.html

Install: Not so easy. Just a lot of bolts in tight places but very doable with this beautifully rendered description.
1. Remove fan and acc belt, remove the lower tensioner (2 bolts) and the upper roller. (1 bolt)
2. Remove power steering pulley (3 bolts), release 2 10mm bolts holding the in/out Ps lines in place(do not remove the actual fluid lines, it’s not necessary)
3. Remove the PS pump bolts(3) pull the pump away from the motor and out of the way, plenty of flex in the lines to do this.
4 remove the (2/3) remaining bolts holding the acc bracket to the engine block (1) high, (1) low, (1) was removed when you pulled out the PS pump.
5. Loosen the two long bolts holding the AC compressor to the Acc bracket, they run parallel to the bumper. One can be accessed from underneath (remove belly pan) the other through the A/c lines

6. Once everything is loose you can pry/pop the acc bracket from the block. Some of the holes are sleeved so it needs leverage assistance.

7. Now that all this shit is out of the way, follow the included instructions to replace the thermostat. Once you see the size of the obstruction the thermostat creates you will start to get excited.

8. I chose to leave the housing in place, it’s going to be way easier if you take the time to remove it, but you will need a new gasket. The spring in the filter housing is extremely strong and difficult to compress far enough to start threading the bolts once the Diverter valve is in place. This is why removing the housing is a better option. I had a unicorn help me, figure it out.

9. Replace everything as you took it out. It takes a bit of fidgeting and convincing to get the Acc bracket back into place because of the sleeving. There is some movement/flex in the ac compressor to help get things aligned.

10. If you didn’t realize you should have drained out the oil, you’re probably pissed and still on step 6. Everyone else, congrats.

Notes: couple busted knuckles. Good time to just do a full oil change. 4 hr job.


Results: 2 days of driving in 100+ temps. Unbelievable results. Oil temp peaked at about 220 driving fairly hard on the Ess625 car. The cool down is outstanding. My normal oil temps while at idle and cruising were closer to 200 with the A/c on at 105’. So very stoked on this piece. What a game changer!


Side note: There is a brass version on fleaBay for $20.

Last edited by LastMCar; 08-20-2018 at 08:14 PM..
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      08-18-2018, 04:54 PM   #2
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I know it gets cold in Vegas during the winter, are you just planning on allowing for a longer warm up time?
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      08-18-2018, 05:12 PM   #3
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Quote:
Originally Posted by roastbeef View Post
I know it gets cold in Vegas during the winter, are you just planning on allowing for a longer warm up time?
I almost always warm up, no matter the season.
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      08-19-2018, 07:20 AM   #4
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Interesting! So the oil thermostat doesn't open up sufficiently, sounds like one cause to the good number of reports on high temperature.
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      08-20-2018, 11:26 AM   #5
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Just ordered one, excited to see what difference it makes.
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      08-20-2018, 11:39 AM   #6
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We've installed these before. Great for track cars but street cars will take forever to warm up in the winter.
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      08-20-2018, 11:42 AM   #7
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Would be interested to hear from people who are still NA how the warmup times and running temps are with this installed compared to stock. Seems like a good idea but wouldn't want normal temps lowered TOO much.
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      08-20-2018, 05:39 PM   #8
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Still 110 temps in Vegas. Did a bit of highway driving today. Avg 10-15 degree difference at max temps. Cool down remains noticeably quicker than stock. Still very happy.
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      08-20-2018, 07:42 PM   #9
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Quote:
Originally Posted by Helmsman View Post
Interesting! So the oil thermostat doesn't open up sufficiently, sounds like one cause to the good number of reports on high temperature.
i read that the benefit is achieved through efficiency... even though the oem oil thermostat opens up "all the way", the thermostat in and of itself is an obstruction. getting rid of it allows for faster flow and circulation.
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      08-20-2018, 08:00 PM   #10
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LastMCar, did it take longer than normal to warm up the oil from cold start after this mod?
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      08-20-2018, 08:06 PM   #11
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Quote:
Originally Posted by Redd View Post
LastMCar, did it take longer than normal to warm up the oil from cold start after this mod?
Not when it’s 100’ out. We will see once the weather cools. My car is always garaged and I always warm up in cold weather.

And yes the efficiency comes from the elimination of a pinky finger sized obstruction in the oil flow. Seems like awful design by Bmw.
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      08-20-2018, 08:21 PM   #12
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Quote:
Originally Posted by LastMCar View Post
Not when it’s 100’ out. We will see once the weather cools. My car is always garaged and I always warm up in cold weather.

And yes the efficiency comes from the elimination of a pinky finger sized obstruction in the oil flow. Seems like awful design by Bmw.
what was the difference? like it went from 1/2" opening to 1" opening?
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      08-20-2018, 08:35 PM   #13
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Quote:
Originally Posted by roastbeef View Post
what was the difference? like it went from 1/2" opening to 1" opening?

Eliminating this. Consider how much disruption in flow this causes.
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      08-20-2018, 08:49 PM   #14
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and the grey piece at the bottom of that pictured device is the inner diameter of the tubing where the oil flows?
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      08-20-2018, 09:04 PM   #15
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Quote:
Originally Posted by roastbeef View Post
and the grey piece at the bottom of that pictured device is the inner diameter of the tubing where the oil flows?
No. The oil flows to the housing thermostat eventually heating up and causing it to open, allowing passage thru the system to the cooler. However, once fully heated and open the thermo sensor remains in the oil flow disrupting the efficiency of flow. Someone can correct me if I’m wrong but that is my analysis after looking at the components.
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      08-20-2018, 10:30 PM   #16
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I'm glad to found your review.
Currently working on a S65 - Active Autowerke stage 2 that sees the occasional track time. Mostly street driven and gets pretty warm here in southern California.
I also installed ALL the CSF coolers with minimal improvement.
Based of your feedback I am going to do this same mod. Thank you for sharing.

In cooling related information : I installed a 160F thermostat from a Dodge Viper.
Part number # 880060 (Motorad brand)
The part number will list S65 & S85 under the description along with V10 engines from Dodge. Perfect fit and coolant temps dropped about 15 degrees. Better recovery time on the cooling fan as well.
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      08-21-2018, 12:20 AM   #17
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Quote:
Originally Posted by schnell1982 View Post

In cooling related information : I installed a 160F thermostat from a Dodge Viper.
Part number # 880060 (Motorad brand)
The part number will list S65 & S85 under the description along with V10 engines from Dodge. Perfect fit and coolant temps dropped about 15 degrees. Better recovery time on the cooling fan as well.
Ordered. $25! great work.
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      08-21-2018, 11:17 PM   #18
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Quote:
Originally Posted by schnell1982 View Post
I'm glad to found your review.
Currently working on a S65 - Active Autowerke stage 2 that sees the occasional track time. Mostly street driven and gets pretty warm here in southern California.
I also installed ALL the CSF coolers with minimal improvement.
Based of your feedback I am going to do this same mod. Thank you for sharing.

In cooling related information : I installed a 160F thermostat from a Dodge Viper.
Part number # 880060 (Motorad brand)
The part number will list S65 & S85 under the description along with V10 engines from Dodge. Perfect fit and coolant temps dropped about 15 degrees. Better recovery time on the cooling fan as well.
link to the above Tstat
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      08-22-2018, 08:17 AM   #19
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https://www.opticatonline.com/part/m...ant-thermostat

When searching the part most often came up as Ford GT thermostat. Seems they can be has for as little as $15.

Also recommended for the Orion Bus.
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      08-22-2018, 09:04 AM   #20
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Nice, will try the motorad tstat.

Stock is 174F (79C).
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      08-22-2018, 11:49 AM   #21
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Quote:
Originally Posted by atopa2002 View Post
link to the above Tstat
Found this last night searching
ECS offers a similar temp thermostat
This one is an OEM german brand

https://www.ecstuning.com/b-gates-pa...537836155~gat/
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      08-22-2018, 11:51 AM   #22
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Quote:
Originally Posted by tdott View Post
Nice, will try the motorad tstat.

Stock is 174F (79C).
https://www.ecstuning.com/b-gates-pa...537836155~gat/

Just found this..
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