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Old 08-19-2016, 10:27 PM   #1
Profoxcg
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Default Radiator upgrade benefits on 2015 STI

I am currently seeing Coolant 195F and Oil 223F or typical highway drives on hot days. I getting ready to take the track to the track next month for some laps.

I am wondering if an aftermarket alum. radiator (3 rows Mishomoto) is going to allow the car to run cooler Coolant temp and Oil temps or what will be the benefit really. I have read several threads on there where peoples say to keep the stock rad, and I also ready else where the opposite.

Am I better off just getting an oil cooler?

My train of thought is/was, a radiator with more rows will cool the coolant faster and thus yield lower temps compared to the stock rad..

Car is stage 2. (Downpipe and Intake)
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Old 08-22-2016, 12:53 AM   #2
subaru_gc8
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mostly I would say what you said is true, but the temp isnt contorled by the radiator but by the thermostat. if you want to make sure you dont over heat, get the 160 degree thermostat. but I wouldnt really run it on the street
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Old 08-23-2016, 03:59 PM   #3
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2015 sti, I have a ron davis radiator and mishimoto oil cooler. I see DD h20 temps of 200 to 220 and oil Temps are usually about 20 degrees above coolant temp 220 to 230. But this is az. If you are hard on the car on track it will overheat. My car stock lasted 5 minutes before I was in the 240 plus h20 temperature. This was a 100 degree track day and I drive my car like I stole it. Your experience might be different depending on your situation. I would at least try to stay with the stock radiator unless you actually do start having issues. Airflow underhood and through the radiator sucks. I would try to add some ducting to direct the air to the radiator. I saw greater benefit in custom ducting than I did in changing my radiator. currently i can run flat out for 15 min plus and h20 temps are usually max 235 oil 255. This is at 90 plus ambient temperature and running quick laps. It just depends how quick you are, if you are running competitive times I feel you might have to back off at some point, just check your h20 gauge on the straights and back off if needed.

Aluminum radiator shroud 2015 sti


Last edited by phxsubaru; 08-23-2016 at 11:25 PM.
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Old 08-28-2016, 01:18 PM   #4
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Thanks for your reply, I live in sunny FLA. (hot and hummid). I see 195 to 200 h2o driving around. 220 - 230 oil temp.

I guess what will happen is that the "better" radiator will help cool the water quicker or better, so that hopefully the water going back into the engine is a little cooler and thus helping keep the operating temperature of the engine from rising too high too quickly?

Where is the engine temperature sensor located (stock location)
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Old 08-28-2016, 06:17 PM   #5
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I am not sure on the location of the stock sensor. I am using a defi oil temp sensor in the front oil galley on the top of the engine. Your current temperatures are fine and will not be improved much by a larger radiator. The larger radiator just has a better ability to shed heat. If you really want to buy something I would get an oil cooler. The mishimoto oil cooler i use is thermostatically controlled. Oil Temps have never been below 180. Even driving in 20 degrees f in the mountains .
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Old 08-28-2016, 06:47 PM   #6
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Thanks. I was thinking of returning the radiator and just getting the oil cooler.
I got a good deal on it so maybe I will just keep it. It can't hurt right?

Being a larger radiator it just means it will be more efficient and maybe more consistent.
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Old 08-28-2016, 10:23 PM   #7
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It will not hurt just don't expect miracles. If you allready have it install it. The stock core is only 1/2 inch thick .



My current ron davis radiator





However our cars have trouble getting the air through the radiator, our hood scoops try to pressurize the under hood area. This in turn negatively impacts cooling. I thought just putting on a radiator would be enough, however the ducting I posted above turned out to be critical to actually cooling the car. With that setup with duct and oil cooler i could run 20 min sessions flat out without h20 >228 F and oil around 260 F during a 90 F degree track day.

I have started making aero changes and with the addition of a front splitter I really had to revamp my cooling plan. I have an event coming up soon so I will know soon enough.

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Old 08-29-2016, 10:55 AM   #8
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Thank you for posting that photo of the stock radiator. I am sure the is a single row(?) That tells the whole story and I agree, it can help more then hurt. I think having 3 row (2" radiator) from Mishimoto will certainly help the system be more efficient and keep the coolant a little cooler.
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Old 08-29-2016, 02:20 PM   #9
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Yes stock is single row. The ron davis radiator is 2 row. Yeah the stock radiator is a joke, I had to take that picture because I just could not believe what I was looking at.
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Old 08-29-2016, 02:34 PM   #10
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Do you have any info on your hood? I'm looking to do the same with mine. If it works of course lol


On my 06, granted its a GD. I saw a significant improvement in the time it took the car to get hot and how quickly it came back down. That also being said. If I was running a lower temp thermostat the coolant temps would probably be too low.
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Old 08-29-2016, 09:57 PM   #11
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No info on hood just modeled it off sti rally cars. I might do some tuft testing at some point. After installing my splitter my h20 temps spiked upwards of 225-230 f. Even driving 65 in 6th gear I could not get my temps to drop off. I had to do something and this was the cheaper option . I added the holes and I Used 1/2 inch aluminum angle to help pull air from the hood and now my temps are usually around 200f with spikes to 210. I felt if it did not work I would buy a proper carbon vented hood. I have a track event coming up soon I will let you know how well the hood works.
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Old 08-29-2016, 11:50 PM   #12
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That's pretty interesting temps rose that much. Did you have a under tray before?
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Old 08-30-2016, 03:09 AM   #13
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I have the new CSF radiator / oil cooler combo in one unit and my oil temps used to be 210-225 and now they are 195-210.

I'm also only running one fan and have had my car in traffic in 90 degree weather with zero overheating.

Pretty awesome...http://csfrace.com/csf-announces-the-o-series/

I just ordered a turbo blanket to help with the under hood ambient temps.
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Old 08-30-2016, 03:12 PM   #14
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Yes I had the stock under tray. Now removed, it really was only about a foot beyond the splitter anyways. I am in az so that is in 115 f ambient temps. After spending 12 plus hours mounting the splitter to a proper sub-frame I was not going to just pull it off. Instead I decided to vent the hood to great effect so far.

Ron davis had the option of the built in oil cooler, however I thought it might be more than I needed. Bought the oil cooler after realizing I needed more cooling.
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Old 09-07-2016, 01:25 PM   #15
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Did you ever buy the Mishimoto radiator? And if so, how did it do?
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Old 09-07-2016, 02:25 PM   #16
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Default I actually installed it this past weekend

It was very straight forward to do. I am so replaced the stock hoses with Mishimoto silicone ones.

The car let out 1.6 gallons on coolant, and took in 2.5 gal (weird).

I am in the process of also upgrading the "black" filler / expansion tank to a mishimoto alum. counterpart and getting bubbles out.

Overall the car seems to run cooler 185-190F normal driving. I did see 205F after driving hard, but I think I still have air in the system.

I am very pleased with it, and it look great !
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Old 09-13-2016, 01:59 PM   #17
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Quote:
Originally Posted by WhatTurboLag? View Post
Do you have any info on your hood? I'm looking to do the same with mine. If it works of course lol


On my 06, granted its a GD. I saw a significant improvement in the time it took the car to get hot and how quickly it came back down. That also being said. If I was running a lower temp thermostat the coolant temps would probably be too low.
I did some tuft testing today on the hood vents. I posted a video on you tube.

https://youtu.be/rvrs2o4CbpU

It appears that the vents are working at speed and air flow towards the center of the hood is undisturbed. I am happy with the results however temps are still an issue. Catless downpipe is on the way and a protune in 2 weeks.
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Old 09-17-2016, 09:18 PM   #18
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so I am glad I upgraded the rad. car runs to much cooler.
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Old 09-24-2016, 10:32 PM   #19
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Quote:
Originally Posted by phxsubaru View Post
2015 sti, I have a ron davis radiator and mishimoto oil cooler. I see DD h20 temps of 200 to 220 and oil Temps are usually about 20 degrees above coolant temp 220 to 230. But this is az. If you are hard on the car on track it will overheat. My car stock lasted 5 minutes before I was in the 240 plus h20 temperature. This was a 100 degree track day and I drive my car like I stole it. Your experience might be different depending on your situation. I would at least try to stay with the stock radiator unless you actually do start having issues. Airflow underhood and through the radiator sucks. I would try to add some ducting to direct the air to the radiator. I saw greater benefit in custom ducting than I did in changing my radiator. currently i can run flat out for 15 min plus and h20 temps are usually max 235 oil 255. This is at 90 plus ambient temperature and running quick laps. It just depends how quick you are, if you are running competitive times I feel you might have to back off at some point, just check your h20 gauge on the straights and back off if needed.

Aluminum radiator shroud 2015 sti


I wanted to share this post with you Phxsubaru.
Seems like we are seeing similar temps with the upgraded radiator? post your thoughts.

what oil cooler do you have
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Old 09-25-2016, 12:09 AM   #20
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Quote:
Originally Posted by Profoxcg View Post
I wanted to share this post with you Phxsubaru.
Seems like we are seeing similar temps with the upgraded radiator? post your thoughts.

what oil cooler do you have
I'm running the mishimoto oil cooler with sandwich plate. Currently it is in front of the radiator and I don't like it there. My current plan is move it to the passenger fog lite area and add ducting and an electrical fan. Labor day weekend I ran 2 days in Wilcox az. Indie motorsports ranch Ambient temps 90 to 95. At about 13 min my temps are about 140 h20 and 160 oil. But most cars including focus rs had to pull off much sooner. The apr splitter really effected my temps but pulling through 75+MPH flat out corners I'm glad I have it.

So I opened my side vents up.
Stock


Unibit to the rescue!



I also removed the inner hood fender protectors, 2 plastic push pins. This could be replaced in 30 seconds if you so desire.




Finally I had to dremel open the actual plastic fender vents.

I'm currently dd with h20 temps about 100 degrees above ambient temp. Oil Temps about 15 to 20 above h20.

Next weekend Im doing another 2 day event in Phoenix so I will let you know how it goes. Also I did tuft string tests both before and after removing the inner hood fender liners and the vents still function.

What radiator caps are you using? I was using stock on upper and 1.3 bar cossworth on the radiator. I have now moved that 1.3 to the top and have a 1.5 cossworth on the radiator. Any advice on caps?
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Old 09-25-2016, 09:51 AM   #21
Profoxcg
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just make sure your radiator cap is a ONE WAY. The cap on the upper thank (expansion) should be a TWO WAY. I am running the stock cap on my radiator and the mishimoto two way on the expansion.
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Old 09-25-2016, 03:56 PM   #22
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Quote:
Originally Posted by Profoxcg View Post
just make sure your radiator cap is a ONE WAY. The cap on the upper thank (expansion) should be a TWO WAY. I am running the stock cap on my radiator and the mishimoto two way on the expansion.
Yeah they are 2 way. I have a pressure differential between my caps so the reality is it should never cross the 1.3 bar barrier because the system is limited by the lowest release valve on the system. So we should end up with similar system pressures.

I will have all my spare caps with me next weekend at the track just in case I don't like what I see.
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Old 09-25-2016, 07:36 PM   #23
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someone asked on another thread if I am running the undertray on the car. Leads me to think, he or she may not think that is a good idea.

Are you? does it make a difference in temps?

I thought it would be beneficial to run the car with one because it :

1- keeps the engine bay clean and debris out
2- acts as diffuser (less turbulence under the car)
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Old 09-26-2016, 12:02 AM   #24
phxsubaru
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Quote:
Originally Posted by Profoxcg View Post
someone asked on another thread if I am running the undertray on the car. Leads me to think, he or she may not think that is a good idea.

Are you? does it make a difference in temps?

I thought it would be beneficial to run the car with one because it :

1- keeps the engine bay clean and debris out
2- acts as diffuser (less turbulence under the car)
I do believe the under tray is beneficial in Stock form. It appears to be shaped to help direct airflow. However I do not use it .I'm running an APR splitter that goes all the way back to the wheel well openings. I modified my stock under tray to still fit in, but the reality was it only went back about 1 foot past where the splitter ended. I saw no difference in Temps once I removed what was left of the undertray. In my case it just seemed like a matter of time before what was left would fold under the car and rip off at speed. If I did not have this splitter I would still be using the stock undertray.
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Old 09-26-2016, 01:11 AM   #25
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thanks.
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