Nismo Radiator cap

XLR8SN · 09-27-2010, 10:02 PM

Just out of curiosity, what is the non-Nismo 370Z radiator cap rated at? The Nismo one is rated at 137kPa or 0.137Mpa. The Nismo cap (aftermarket) is rated at 0.13Mpa....or roughly 130kPa. So wouldnt the aftermarket Nismo one be at a lower rating than the OEM Nismo 370Z version?

I would assume that changing out the radiator cap to a lower Mpa rating would then lower the boiling point correct?

Just wondering. Figured that I would leave the OEM cap alone and not change it for a "nicer"..."prettier" shiny Nismo badged one.

XLR8SN · 09-28-2010, 01:36 PM

Can someone please take a look under their hood to report on what the radiator cap rating is at please on a non-Nismo 370Z???

XLR8SN · 09-29-2010, 02:55 PM

Bueller??? Anyone........????

G Fo12ce · 09-29-2010, 02:59 PM

Pretty sure it says on the cap doesn't it?

SE · 09-29-2010, 05:39 PM

Actually a higher pressure cap raises the boiling point of coolant as it pressurizes the cooling system.

XLR8SN · 09-29-2010, 07:24 PM

Quote:

Originally Posted by G Fo12ce

Pretty sure it says on the cap doesn't it?

Yep I am sure that it says on the cap. Just wondering if the non-Nismo variant has a different cap rating versus the 137 kPa on the Nismo model. Hoping that another member would just post the rating that they can see on the cap for a comparison.

Victor-Yup to that as well too. Realize that it will raise the boiling point....its one of those things that I pulled off the old cap from my G35 which was a 88 kPa rating and hence the 1.3 would have been okay. Just that the Nismo 370 seems to have a really high 137 kPa rating. Thus making the 1.3 Nismo cap...a little bit lower now versus OEM. Since the stock 370 Nismo cap is rated at 1.37 bar.

280z/300zx · 09-29-2010, 07:49 PM

my 09 touring sport states 137kpa on the cap. Hope this helps

XLR8SN · 09-29-2010, 09:26 PM

Quote:

Originally Posted by 280z/300zx

my 09 touring sport states 137kpa on the cap. Hope this helps

YES!!!! Thank you. Much appreciated. Hmmm..if that is so, then if you replace the OEM cap with the shiny Nismo labeled one...you will be lowering your boiling point in your car versus raising it. Best to leave the OEM on and not change it out then.

fuzzywuzzy · 09-29-2010, 10:10 PM

Dear lord, radiator caps??? next theres going to be a ....Dude i just got a carbon fiber radiator cap for $100.00 and it gives me 20hp and makes me lighter post or thread....

XLR8SN · 09-30-2010, 12:21 AM

Quote:

Originally Posted by fuzzywuzzy

Dear lord, radiator caps??? next theres going to be a ....Dude i just got a carbon fiber radiator cap for $100.00 and it gives me 20hp and makes me lighter post or thread....

Uhhhh yeah. It is actually more like 15.9...but 20hp is close enough.

Its actually from my old G35...just thought to maybe use it. The ratings have changed and apparently it is now technically underrated versus the OEM version. Thats all that I was asking about.

KillerBee370 · 09-30-2010, 01:05 AM

Jdmspeed-Z · 05-01-2013, 03:57 AM

2012 nissan 370z no kpa labeled on the radiator cap but says 88kpa on the coolant resorivor tank cap?

luigi90210 · 05-01-2013, 04:55 AM

Quote:

Originally Posted by fuzzywuzzy

Dear lord, radiator caps??? next theres going to be a ....Dude i just got a carbon fiber radiator cap for $100.00 and it gives me 20hp and makes me lighter post or thread....

but my carbon fiber radiator adds 25whp and -100lbs, i also got a carbon fiber dash cover so i can reduce weight by 20lbs and add 20whp plus i just added a sticker so thats another 200whp

09-27-2010, 10:02 PM	#1 (permalink)
XLR8SN Enthusiast Member Join Date: Jun 2009 Location: Hawaii Posts: 363 Drives: Nissan Rep Power: 16	Nismo Radiator cap Just out of curiosity, what is the non-Nismo 370Z radiator cap rated at? The Nismo one is rated at 137kPa or 0.137Mpa. The Nismo cap (aftermarket) is rated at 0.13Mpa....or roughly 130kPa. So wouldnt the aftermarket Nismo one be at a lower rating than the OEM Nismo 370Z version? I would assume that changing out the radiator cap to a lower Mpa rating would then lower the boiling point correct? Just wondering. Figured that I would leave the OEM cap alone and not change it for a "nicer"..."prettier" shiny Nismo badged one.

09-29-2010, 02:59 PM	#4 (permalink)
G Fo12ce Premium Member Join Date: Nov 2009 Location: Socal Posts: 996 Drives: Sold! Rep Power: 52	Pretty sure it says on the cap doesn't it? __________________ Nismo Suspension: New Owners Check Here!

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09-28-2010, 01:36 PM	#2 (permalink)
XLR8SN Enthusiast Member Join Date: Jun 2009 Location: Hawaii Posts: 363 Drives: Nissan Rep Power: 16	Can someone please take a look under their hood to report on what the radiator cap rating is at please on a non-Nismo 370Z???

09-29-2010, 02:55 PM	#3 (permalink)
XLR8SN Enthusiast Member Join Date: Jun 2009 Location: Hawaii Posts: 363 Drives: Nissan Rep Power: 16	Bueller??? Anyone........????

09-29-2010, 05:39 PM	#5 (permalink)
SE A True Z Fanatic Join Date: Jan 2010 Location: San Jose, CA Posts: 4,236 Drives: 370z/STI/EVO X/IS-F Rep Power: 23	Actually a higher pressure cap raises the boiling point of coolant as it pressurizes the cooling system.

09-29-2010, 07:49 PM	#7 (permalink)
280z/300zx Track Member Join Date: Feb 2009 Location: Nevada Posts: 689 Drives: 280z, 300zx, Vette Rep Power: 272	my 09 touring sport states 137kpa on the cap. Hope this helps

09-29-2010, 10:10 PM	#9 (permalink)
fuzzywuzzy Base Member Join Date: Apr 2010 Location: In a house Posts: 211 Drives: 370z Rep Power: 15	Dear lord, radiator caps??? next theres going to be a ....Dude i just got a carbon fiber radiator cap for $100.00 and it gives me 20hp and makes me lighter post or thread....

09-30-2010, 01:05 AM	#11 (permalink)
KillerBee370 A True Z Fanatic Join Date: Mar 2009 Location: So Cal baby! Age: 51 Posts: 5,964 Drives: with passion Rep Power: 321

05-01-2013, 03:57 AM	#12 (permalink)
Jdmspeed-Z Enthusiast Member Join Date: Apr 2013 Location: Guam Posts: 304 Drives: O7 nissan 370z Rep Power: 12	2012 nissan 370z no kpa labeled on the radiator cap but says 88kpa on the coolant resorivor tank cap?