STi High Pressure Radiator Cap

PhillyScott · 02-26-2003, 10:23 PM

Can anyone explain to me the advantages of installing a 1.3 bar STi High Pressure Radiator Cap?

Thanks,
_Scott

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richeich · 02-27-2003, 08:44 PM

I'm curious about this as well. Anybody have any experience or knowledge about it?

Rich

DoorKnob · 02-27-2003, 10:49 PM

Simple, higher pressure let's the water carry more heat before it boils. Normally, at 1 bar, pure water boils at 100°C. When you increase the pressure, it takes more than 100° to boil the water. Now the coolant in your car isn't exactly pure water, but the concept is the same.

cvalle-sd · 02-27-2003, 11:30 PM

cooler engine, and all that goes with it...

Simon Quezada · 02-27-2003, 11:34 PM

But if you just change the cap your presure won't go up will it.

I mean it just means that the cap will take 1.3 right?

mycarsux · 02-28-2003, 12:35 AM

do u have to upgrade ur cooling system?? say like hoses or the radiator?? or can u just put it on a stock system?

spiralsmurf · 02-28-2003, 03:35 AM

anybody want to order some? i can get them in a week or so for pretty cheap.

HndaTch627 · 02-28-2003, 10:58 AM

careful, the radiator tank prolly won't hold the increased pressure

Sunrise City Rider · 02-28-2003, 08:41 PM

The higher pressure will keep the cap closed for longer allowing the water to continue circulating thru the engine instead of overflowing into the coolant reservoir...This is necessary for endurance racing and prolonged driving on a long road trip...It is good to keep water moving instead of just dumping it in the reservoir...Your radiator's tanks should hold the extra pressure without any problems...

Zee

HndaTch627 · 03-01-2003, 02:48 AM

Quote:

Originally posted by Sunrise City Rider
The higher pressure will keep the cap closed for longer allowing the water to continue circulating thru the engine instead of overflowing into the coolant reservoir...This is necessary for endurance racing and prolonged driving on a long road trip...It is good to keep water moving instead of just dumping it in the reservoir...Your radiator's tanks should hold the extra pressure without any problems...

Zee

tell that to the WRX owners.

and on long trips?? you realise that at crusing speed the CFM moving thru your radiator is so insane that the cooling fans themselves would never keep up with it. it has nothing to do with keeping the coolant in the tank, it's about raising the boiling point of the coolant/water mix by applying more pressure to it. the problem is if the radiator tank can hold it it will split. your coolant is always moving back and forth between the resivoir and the radiator.

jeremy

PhillyScott · 03-01-2003, 04:59 AM

So is there any harm installing the STi "high pressure cap"?

_Scott

02-26-2003, 10:23 PM	#1
PhillyScott Scooby Newbie Member#: 32387 Join Date: Jan 2003 Location: Philadelphia Vehicle: '03 2.5 RS,silver '03 Legacy SE Wagon,white	STi High Pressure Radiator Cap Can anyone explain to me the advantages of installing a 1.3 bar STi High Pressure Radiator Cap? Thanks, _Scott * Registered users of the site do not see these ads.

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02-27-2003, 08:44 PM	#2
richeich Scooby Specialist Member#: 1353 Join Date: Apr 2000 Vehicle: 2001 Impreza 2.5RS Silver	I'm curious about this as well. Anybody have any experience or knowledge about it? Rich

02-27-2003, 10:49 PM	#3
DoorKnob Scooby Newbie Member#: 395 Join Date: Oct 1999 Location: Daly City, CA USA Vehicle: 2000 Impreza 2.5RS Blue Ridge Pearl	Simple, higher pressure let's the water carry more heat before it boils. Normally, at 1 bar, pure water boils at 100°C. When you increase the pressure, it takes more than 100° to boil the water. Now the coolant in your car isn't exactly pure water, but the concept is the same.

02-27-2003, 11:30 PM	#4
cvalle-sd Scooby Specialist Member#: 420 Join Date: Oct 1999 Chapter/Region: SCIC Location: The LBC, CA, USA Vehicle: 2001 Cr-V Silver	cooler engine, and all that goes with it...

02-27-2003, 11:34 PM	#5
Simon Quezada Scooby Newbie Member#: 28730 Join Date: Nov 2002 Location: San Antonio Vehicle: 2003 WRX Blue	But if you just change the cap your presure won't go up will it. I mean it just means that the cap will take 1.3 right?

02-28-2003, 12:35 AM	#6
mycarsux Scooby Specialist Member#: 32049 Join Date: Jan 2003 Chapter/Region: SCIC Location: Fullerton, CA Vehicle: 2002 2.5RS slowbaru +Canon 5D & 30D	do u have to upgrade ur cooling system?? say like hoses or the radiator?? or can u just put it on a stock system?

02-28-2003, 03:35 AM	#7
spiralsmurf Scooby Specialist Member#: 16085 Join Date: Mar 2002 Chapter/Region: SCIC Location: Chatsworth, CA Vehicle: 2005 STi Black	anybody want to order some? i can get them in a week or so for pretty cheap.

02-28-2003, 10:58 AM	#8
HndaTch627 Scooby Guru Member#: 6551 Join Date: May 2001 Chapter/Region: MWSOC Location: Carol Stream, IL Vehicle: '01 GC8 Dinged STM '09 Concours 14 ABS Black	careful, the radiator tank prolly won't hold the increased pressure

02-28-2003, 08:41 PM	#9
Sunrise City Rider Scooby Specialist Member#: 1503 Join Date: May 2000 Chapter/Region: South East Location: Sunrise, FL, USA Vehicle: 2000 Impreza W"RS"X Blue Ridge Pearl	The higher pressure will keep the cap closed for longer allowing the water to continue circulating thru the engine instead of overflowing into the coolant reservoir...This is necessary for endurance racing and prolonged driving on a long road trip...It is good to keep water moving instead of just dumping it in the reservoir...Your radiator's tanks should hold the extra pressure without any problems... Zee

03-01-2003, 04:59 AM	#11
PhillyScott Scooby Newbie Member#: 32387 Join Date: Jan 2003 Location: Philadelphia Vehicle: '03 2.5 RS,silver '03 Legacy SE Wagon,white	So is there any harm installing the STi "high pressure cap"? _Scott