Cooling Question

[DRLane]

Originally Posted by dogbone

Unfortunately, on this platform, there are no magical solutions to the engine overheating.

I think it’s less magical and more “no easy” solutions. What has been tried is largely just the iterations of the same things over and over expecting different results.

There’s nothing inherently disqualifying about the S65 that requires it to overheat even when supercharged, on slicks, with aero.

Just the systems employed are largely poorly executed as a true system. Mostly a bunch of 80% efforts across each component in the system (airflow dictation, radiator placement, pressure restrictions, water circulation, ambient under hood temps, etc).

Hood vents and radiator core upgrades definitely is no holy grail though! That’s for sure.

[Narvin]

Originally Posted by DRLane

I think it’s less magical and more “no easy” solutions. What has been tried is largely just the iterations of the same things over and over expecting different results.

There’s nothing inherently disqualifying about the S65 that requires it to overheat even when supercharged, on slicks, with aero.

Just the systems employed are largely poorly executed as a true system. Mostly a bunch of 80% efforts across each component in the system (airflow dictation, radiator placement, pressure restrictions, water circulation, ambient under hood temps, etc).

Hood vents and radiator core upgrades definitely is no holy grail though! That’s for sure.

Your coolers and an undertray sounds like the plan for now lol

Let me know!! 😎

[Redd]

Undertray and the oil cooler ducting is important! I ran for years without the oil cooler duct (didn't realize it was missing). When I did my metal undertray the mech realized the duct was missing and we replaced it. Instantly saw 8-10C reduction in oil temps especially at cruising speeds.

[Narvin]

Finally got around to ordering stuff. Coolers coming in from DRLane (do88 oil, power steering, and csf radiator). Also ordered an oil diverter valve and I’m putting on the OEM undertray. Also going to use redline water wetter.

Since temps have risen in my area (90-100 degrees F), my long commute home with my shortened diff (80mph at 4k rpm) has driven my oil temps up in the 240s which gives me low hopes for a track day in its current state. Will report back results as soon as everything is installed.

[omgzirra_exe]

Originally Posted by Narvin

Finally got around to ordering stuff. Coolers coming in from DRLane (do88 oil, power steering, and csf radiator). Also ordered an oil diverter valve and I’m putting on the OEM undertray. Also going to use redline water wetter.

Since temps have risen in my area (90-100 degrees F), my long commute home with my shortened diff (80mph at 4k rpm) has driven my oil temps up in the 240s which gives me low hopes for a track day in its current state. Will report back results as soon as everything is installed.

nice, just don't run full distilled and RWW as RWW is meant to flushed more often than regular fluid and honestly quiet often lol.

For me to avoid doing it so often, i run a mix.

70% distilled, 30% coolant, 1 bottle of RWW.

[Narvin]

I have everything installed
Initial impression is that it absolutely helped. The gauge is no longer near 3rd mark at all.

Went with 25% super water wetter, 75% bmw coolant/distilled water 50/50 mix
Csf radiator
Do88 oil cooler
Vac oil diverter valve

When it’s cool (70s). temps are under 210

At 95, dash shows around 215-220.

Startup only takes an extra 5-8 minutes so it’s really no big deal. I just keep it under 3K rpm

Odd thing was that it took almost 10.5L to fill the car back up before the sensor said the level was fine. I did drain the oil overnight including from the cooler lines and the oil filter housing.

I’ll have more accurate data to report soon because I now have an awron gauge to monitor water vs oil temp

[omgzirra_exe]

Originally Posted by Narvin

Odd thing was that it took almost 10.5L to fill the car back up before the sensor said the level was fine. I did drain the oil overnight including from the cooler lines and the oil filter housing.

dima had this issue to, i told him its either his voltage regular or his battery, bro finally replace his battery and it read fine again lol.

[Redd]

Originally Posted by Narvin

Startup only takes an extra 5-8 minutes so it’s really no big deal. I just keep it under 3K rpm

What are the ambient temps where you live?

[Narvin]

Originally Posted by Redd

What are the ambient temps where you live?

90-100 in the summer


Here’s temps after warming up and idling for 25 mins. I don’t have any control data to compare it to. Any thoughts? (It was 95 outside at the time

[Oreo Cat]

Originally Posted by Narvin

I do have hood vents already. However, I currently am running no undertray

My stock oil cooler and radiator have 160K miles on it and are original.. they’re pretty much due for maintenance

are these track spec vents that have been epoxied on under the hood?

[Oreo Cat]

This is an interesting thread, I'm in a similar situation. I have a SC'd e90 m3 DCT that I want to run cooler. I have a larger DCT fluid pan waiting to go on and was planning on the 3 vent track spec hood louver setup. my next step was going to be a larger oil cooler or radiator, but now maybe I should consider doing the trans cooler first?

[Narvin]

Originally Posted by Oreo Cat

This is an interesting thread, I'm in a similar situation. I have a SC'd e90 m3 DCT that I want to run cooler. I have a larger DCT fluid pan waiting to go on and was planning on the 3 vent track spec hood louver setup. my next step was going to be a larger oil cooler or radiator, but now maybe I should consider doing the trans cooler first?

Yes the vents are epoxied under the hood. They are puretech Sweden vents. The track spec hood vents were a little too aggressive and big for me.

I personally didn’t have any trans issues before I got my do88 dct cooler. I just had the bigger pan. To be honest I just thought it looked great and I got a good deal.

Attached below are photos of temps now cruising to work. I have a 3.85 differential and this was at 85mph around 4k rpm. 70 degree ambient temp. I saw it touch 199 a few times when I let off to 3200ish rpm.

I’m running liquimoly 10w60. I found that my dashboard gauge closely followed the oil temps vs radiator.

Overall pretty happy with the results! I doubt it’s as good as other people’s systems but it has significantly brought down my car’s temps

[omgzirra_exe]

oof chill with the speeding there bud... 148ftlbs of torque is a monster.

[Narvin]

Originally Posted by omgzirra_exe

oof chill with the speeding there bud... 148ftlbs of torque is a monster.

I was like 25% throttle aite my boi 😂