Brando's Newbie 818R Build Thread

[Brando]

I took my car for a spin after the show yesterday and got on it. After 10 minutes of semi-hard driving it started getting hot. I drove around slowly and the temp still kept climbing.
In hindsight I wish I would have felt to the radiator to make sure it was hot so I know the water pump & thermostat was working.

What's my best troubleshooting approach at figuring out the root of the overheating?

Thermostat? Air in system?

[Mitch Wright]

I start by looking for air trapped in the system.

[C.Plavan]

+1 on air in system. Do have one of those bleeder pieces that others have put on? I need to find one also.

[RM1SepEx]

did you connect the top of the engine coolant output to the thermostat housing with a small hose? I added a brass nipple to the aluminum output connection from th motor where you use the 90 degree hose. without it the system woul;d be near impossible to bleed. Photos on my thread... God only knows how far back... sorry for that.

[Brando]

did you connect the top of the engine coolant output to the thermostat housing with a small hose? I added a brass nipple to the aluminum output connection from th motor where you use the 90 degree hose. without it the system woul;d be near impossible to bleed. Photos on my thread... God only knows how far back... sorry for that.

Page 10 on your thread seems to be where you addressed the coolant burping. I still am having a tough time getting my arms around just what to do. I shot a video in hopes you might be able to identify where I went wrong...but now i realize i should have shot the turbo coolant reservoir. If that's what you need let me know i will re-shoot.
Thanks for the help on this. Its frustrating having it overheat in 10 minutes.

+1 on air in system. Do have one of those bleeder pieces that others have put on? I need to find one also.

Are you referring to the small valve they installed on the heater hose loop? No I actually don't have one of those but that's going to be my next purchase. Would this be an alternative to RM1SepEx solution?

Here is the video, let me know if i need to re-shoot so you can see what you need

[C.Plavan]

Here is a good thread in case you didn't see it.

There were guys that added an additional connection towards the radiator. Like it was meant for burping the air out. I cant seem to find who had a picture, but it connected to the radiator hose. I'll keep looking. Or if someone is reading this, post away.

http://thefactoryfiveforum.com/showt...hlight=burping

[RM1SepEx]

In the thread Chad ref above see the brass fitting shown in post #8 It is tapped directly into the upper radiator hose connection of the motor. Fluid used to go up from there to the radiator, now it goes down again, then up, making it difficult to burp.

It goes to the extra fitting on the turbo expansion tank. It used to go to the nipple that we had to block off on the radiator. You can see how air can get trapped without that extra loop

[Brando]

In the thread Chad ref above see the brass fitting shown in post #8 It is tapped directly into the upper radiator hose connection of the motor. Fluid used to go up from there to the radiator, now it goes down again, then up, making it difficult to burp.

It goes to the extra fitting on the turbo expansion tank. It used to go to the nipple that we had to block off on the radiator. You can see how air can get trapped without that extra loop

I ran a long hose from that extra fitting all the way up front to the nipple you had blocked. So from i'm understanding i delete that hose, plug the nipple on the radiator, tap a nipple into upper radiator hose and run it to the location of the hose i just removed on the expansion tank.

The fix is that easy? I'm off to ace. Thanks guys

[DruOdil]

Your car looked very very good in person. You have done a lot of high quality building in a short amount of time. Just keep doing what your doing.

[Brando]

Thank Dru. It was good to see you again...and walking at that. I can't wait to see the 450hp beast your going to build.

[wleehendrick]

Hey Brandon, good to see you again, and meet your family.

Dru, I had Ron over on Friday to help me me out with my motor. He's a good guy, thanks for referring him to me. He likes the motor he's building for you, but thinks you're nuts... overkill for a 818!

[iWire]

Page 10 on your thread seems to be where you addressed the coolant burping. I still am having a tough time getting my arms around just what to do. I shot a video in hopes you might be able to identify where I went wrong...but now i realize i should have shot the turbo coolant reservoir. If that's what you need let me know i will re-shoot.
Thanks for the help on this. Its frustrating having it overheat in 10 minutes.


Are you referring to the small valve they installed on the heater hose loop? No I actually don't have one of those but that's going to be my next purchase. Would this be an alternative to RM1SepEx solution?

Here is the video, let me know if i need to re-shoot so you can see what you need

I would definitely agree with everyone here that you have a bubble, just need to find a good way to get it out.

[Brando]

I would definitely agree with everyone here that you have a bubble, just need to find a good way to get it out.

I'm tapping a 1/8" npt -> barbed nipple from the upper coolant hose off the motor and running that to the degas tank tonight. It sounds like that is the remedy.

[Wayne Presley]

Do my mod Brando, works the first time every time.

[Brando]

Do my mod Brando, works the first time every time.

Your mod is what i'm trying to emulate. Is my game plan above the correct approach?

[Wayne Presley]

Go from the water crossover to the unused port on the degas tank

[Brando]

So Wayne's mod worked exactly as expected.

I purchased a 1/8th NPT - 27 to barbed fitting and tapped it into the water crossover. I ran it to the degas tank and that was that. My overheating issues are gone and I now can drive for more than 10 minutes.
In light of this of made an appointment at the DMV on May 6th for their SB100 bill to register this beast.

Without this forum this build would be nearly impossible. Thank you so much for all your help along the way.

[Wayne Presley]

The reason why it traps air is the upper radiator hose on the WRX goes uphill to the radiator allowing the air to travel out. On the 818 the water outlet goes down and the water is unable to displace the trapped air. The highest part on the motor for air to escape is the water feed to the turbo which is only halfway up one head. So you put in a nipple on the water outlet and as you fill the motor through the degas tank, water runs into the tube to the water pump and fills the motor while the air escapes through the newly installed nipple and out the degas tank. As the motor runs the small bits of trapped air make their way to the degas tank.

[Xusia]

What is the degas tank? Is the tank Mechie3 made a relocation bracket for?

[longislandwrx]

What is the degas tank? Is the tank Mechie3 made a relocation bracket for?

correctamundo

[Bill Waters]

The reason why it traps air is the upper radiator hose on the WRX goes uphill to the radiator allowing the air to travel out. On the 818 the water outlet goes down and the water is unable to displace the trapped air. The highest part on the motor for air to escape is the water feed to the turbo which is only halfway up one head. So you put in a nipple on the water outlet and as you fill the motor through the degas tank, water runs into the tube to the water pump and fills the motor while the air escapes through the newly installed nipple and out the degas tank. As the motor runs the small bits of trapped air make their way to the degas tank.

Wayne - which degas tank did you use - stock or otherwise? Also, are you using one at the radiator only, or one at the engine as well? I recall someone suggesting the latter, but wasn't sure if that would be necessary with the water outlet nipple you suggest above.

Thanks,

Bill

[Brando]

I think by degas tank Wayne is referring to the turbo coolant reservoir not the overflow. If i'm not mistaken Wayne recommends an overflow on both the front RAD and the rear degas tank. I'm running a long hose from my degas up to the front overflow connected to the RAD. I plan on getting a second overflow soon for the rear however.

[Wayne Presley]

Use the stock degas tank with a coolant recovery tank in the rear. You can then run a recovery tank in the front or just plug the port on the radiator cap.

[C.Plavan]

Brando-
Did you need to use any teflon tape or did it seal fine?

[Wayne Presley]

Use teflon tape

[Brando]

I used teflon tape.
Wayne, If i'm using an AWIC i will need a recovery in the front as well right?
Is there any reason i cant run from the rear degas to the front recovery or is it a must to have a recovery at each end?

[Wayne Presley]

I used teflon tape.
Wayne, If i'm using an AWIC i will need a recovery in the front as well right?
Is there any reason i cant run from the rear degas to the front recovery or is it a must to have a recovery at each end?

I would run a recovery in the front and use it for both the radiator and AWIC heat exchanger. Then use another recovery tank in the rear with no line from degas in back to the recovery in the front.

[FFRSpec72]

Would also recommend that you use something like HyperKuhl to prevent corrosion and help heat transfer (I get maybe 5 degrees cooler when using this stuff) but after a season of racing when I drain the radiator/engine the solution is still light blue, no rust and the aluminum is not pitted/corroded.

[Bill Waters]

Use the stock degas tank with a coolant recovery tank in the rear. You can then run a recovery tank in the front or just plug the port on the radiator cap.

Thanks, Wayne

[Xusia]

Silly question time. If the degas tank is the one relocated by Mechie3's bracket, which is the overflow tank?

[C.Plavan]

Would also recommend that you use something like HyperKuhl to prevent corrosion and help heat transfer (I get maybe 5 degrees cooler when using this stuff) but after a season of racing when I drain the radiator/engine the solution is still light blue, no rust and the aluminum is not pitted/corroded.

I would suggest checking with the track or racing organization first. Some do not allow "Water Wetter" type additives.

[FFRSpec72]

I would suggest checking with the track or racing organization first. Some do not allow "Water Wetter" type additives.

All tracks here in the NW allow these types of additives (non glycol based), most of the organizations are silent on this as it is a track issue all tracks here in NW prohibit any glycol based products in the radiator. The race supplement here in the NW, is where they prohibit the glycol based products, not in the GRC.

[Brando]

Silly question time. If the degas tank is the one relocated by Mechie3's bracket, which is the overflow tank?

overflow tank = recovery tank.... the one FFR has you take from the radiator and relocate to the rear. I am keeping the one on the radiator and adding a second for the Degas tank

[FFRSpec72]

overflow tank = recovery tank.... the one FFR has you take from the radiator and relocate to the rear. I am keeping the one on the radiator and adding a second for the Degas tank

Ideally you would just need a degas tank or a air bleed point and overflow tank and plug the radiator overflow and make sure you use a non venting cap on the radiator

[Brando]

Unless you have an AWIC which needs an overflow up front as well

[FFRSpec72]

Unless you have an AWIC which needs an overflow up front as well

yea, I'm just staying stock JDM with tune, so ~300hp is enough for my daughter no need for AWIC

[Brando]

You don't worry about heat soak?

[FFRSpec72]

You don't worry about heat soak?

Nope, not running autoX and it never gets above 80 here and I run on tracks that have up to a mile straight, so the Subaru folks here have no issues with heat soak.

[07FIREBLADE]

Wow you got an appointment coming up that soon. Surprised that you got an appointment so soon. Who many sb100s are left do you know? Let me know how it goes. Getting ready to start making calls to the DMV soon.

[Wayne Presley]

Nope, not running autoX and it never gets above 80 here and I run on tracks that have up to a mile straight, so the Subaru folks here have no issues with heat soak.

And those cars have a much better airflow through the IC...