When to use a higher pressure rad cap? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Turbo · 05-29-2019, 05:05 PM

I've noticed that some of the aftermarket rads (like the Jackson Racing) even come with them.

Can I run an upgraded cap with the OEM rad safely?

15limited · 05-29-2019, 05:07 PM

A cap ain't gunna make ya or break ya.

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Trueweltall · 05-29-2019, 06:44 PM

I've been using a higher pressure radiator cap for over a year now. You won't notice a difference except now when your coolant hits 250f you'll know it's not boiling.

Icecreamtruk · 05-31-2019, 10:27 AM

When your headgasket is dying but you want to keep tracking. Wish I was joking but I ended up "patching up" the problem to finish the season and rebuilt later. It worked, until it got worse.

nikitopo · 05-31-2019, 12:13 PM

A lower temp thermostat is more useful than a higher pressure radiator cap.

Tristor · 05-31-2019, 12:29 PM

Honestly, I'd advise against running a higher pressure radiator cap unless you've upgraded all the components which would see pressure to a point where they're rated to take the pressure you want to set and then some for safety. This is basically what I did. After swapping my radiator, I also swapped out the hoses and the filler neck before switching to a higher pressure cap.

JD001 · 05-31-2019, 01:00 PM

Quote:

Originally Posted by Icecreamtruk

When your headgasket is dying but you want to keep tracking. Wish I was joking but I ended up "patching up" the problem to finish the season and rebuilt later. It worked, until it got worse.

Did you use a raw egg to fix the problem temporarily?

Icecreamtruk · 05-31-2019, 02:04 PM

Quote:

Originally Posted by JD001

Did you use a raw egg to fix the problem temporarily?

lol no, but if there's any interesting stories about it...

JD001 · 05-31-2019, 02:19 PM

Quote:

Originally Posted by Icecreamtruk

lol no, but if there's any interesting stories about it...

I think ole @humfrz may have some 'back in the day' stories about using eggs to fix cars.. or should that read carts??

Trueweltall · 05-31-2019, 02:38 PM

Quote:

Originally Posted by Tristor

Honestly, I'd advise against running a higher pressure radiator cap unless you've upgraded all the components which would see pressure to a point where they're rated to take the pressure you want to set and then some for safety. This is basically what I did. After swapping my radiator, I also swapped out the hoses and the filler neck before switching to a higher pressure cap.

This won't be an issue.

humfrz · 05-31-2019, 02:47 PM

Quote:

Originally Posted by JD001

I think ole @humfrz may have some 'back in the day' stories about using eggs to fix cars.. or should that read carts??

Well, I preferred to eat the egg and use raw oatmeal to put in the radiator to fix a small leak. If a radiator hose had split, duck tape it up and don't put the radiator cap back on.

hints by Bubba

Tristor · 05-31-2019, 06:23 PM

Quote:

Originally Posted by Trueweltall

This won't be an issue.

So when you say "this won't be an issue", by implication I'm taking it that you're saying the factory radiator with plastic end tanks known for cracking over time due to heat cycling, and the hoses and plastic filler neck engineered specifically for the rated pressure of the cooling system won't be harmed or experience accelerated wear in any way by changing the pressure relief valve to open at a higher pressure?

Or maybe, just because people don't immediately see their cars blow up doesn't mean something is a good idea and totally harmless. Pressure systems are serious business. It's not significantly costly to upgrade the related components to handle higher pressures if you have a reason to do so. For the vast majority of people running a higher pressure cooling system is completely pointless and buying a higher pressure radiator cap is a waste of money.

Trueweltall · 06-01-2019, 12:08 PM

You're overthinking it Tristor.

15limited · 06-01-2019, 12:22 PM

Quote:

Originally Posted by Trueweltall

You're overthinking it Tristor.

U mad cuz u got roasted

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05-29-2019, 05:05 PM	#1
Turbo Senior Member Join Date: Jul 2012 Drives: FR-S Turbo Location: Grand Bend Posts: 310 Thanks: 337 Thanked 84 Times in 60 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	When to use a higher pressure rad cap? I've noticed that some of the aftermarket rads (like the Jackson Racing) even come with them. Can I run an upgraded cap with the OEM rad safely?

05-29-2019, 05:07 PM	#2
15limited Senior Member Join Date: Apr 2015 Drives: BRZ Location: PNW Posts: 387 Thanks: 456 Thanked 150 Times in 113 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	A cap ain't gunna make ya or break ya. Sent from my SM-G950U using Tapatalk __________________ Perrin Transmission Bolt, Drift Button,Intake Tube, Radiator Hoses, Engine Mounts, Gurney Flap Diode Dynamics Always On Module OLM 3k HID Foglights GCS Smoked Side Markers Motul Gear 300/300 V OE Acantara arm rest Password JDM Dry Carbon rear diffuser Rally Armour Mud flaps H.I.C side & rear visor Gruppe-S UEL header/OP HKS Front Pipe Leg Sport Cat Back Koyorad aluminum radiator Wheelhaus CF low pro 3rd brake light Toms JDM Clear Tail Lamps

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05-29-2019, 06:44 PM	#3
Trueweltall Senior Member Join Date: Feb 2016 Drives: 2016 Subaru BRZ Location: Florida Posts: 394 Thanks: 91 Thanked 195 Times in 115 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	I've been using a higher pressure radiator cap for over a year now. You won't notice a difference except now when your coolant hits 250f you'll know it's not boiling.

05-31-2019, 10:27 AM	#4
Icecreamtruk Senior Member Join Date: Dec 2015 Drives: Track preped NA FRS Location: Montreal, Canada Posts: 987 Thanks: 1,056 Thanked 680 Times in 405 Posts Mentioned: 12 Post(s) Tagged: 0 Thread(s)	When your headgasket is dying but you want to keep tracking. Wish I was joking but I ended up "patching up" the problem to finish the season and rebuilt later. It worked, until it got worse.

05-31-2019, 12:13 PM	#5
nikitopo Senior Member Join Date: Mar 2014 Drives: '15 BRZ RA Location: Greece Posts: 3,787 Thanks: 2,416 Thanked 1,944 Times in 1,261 Posts Mentioned: 29 Post(s) Tagged: 0 Thread(s)	A lower temp thermostat is more useful than a higher pressure radiator cap.

06-01-2019, 12:08 PM	#13
Trueweltall Senior Member Join Date: Feb 2016 Drives: 2016 Subaru BRZ Location: Florida Posts: 394 Thanks: 91 Thanked 195 Times in 115 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	You're overthinking it Tristor.

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