Radiator Caps... Spac, Skunk2 Vs Nismo

[KrazyKong]

After putting in my new koyo oem radiator (looks identical to the stock one), it's time for a new cap. I currently have a SPAC/PIAA "53" 0.9 cap which looks to have reached it's useful end. So I need to get another one.

However what are the benefits to using a Nismo 1.3 cap? Will my car cool better as the descriptions I've read say it will?

And another question, is 0.9 the correct pressure cap I'm supposed to have? My car is a pretty much stock R33 GTST. All I've done is ground the boost, and installed a FMIC. The reason I ask this, is on the nengun.com website, their description of the Nismo 1.3 cap, mentions that stock is actually 1.2 !!??

"The Nismo radiator cap is a heavy duty radiator cap, which operates at 18.2 lbs (1.3 kg/cm) compared to 12.6 lbs (0.9 kg/cm) non-turbo and 16.8 lbs. (1.2 kg/cm) turbo Nissan OE(Original Equipment) stock caps."

http://www.nengun.com/nismo/radiator-cap

So does that mean me having a 0.9 cap all this time was wrong, when I should have been using a 1.2?

Confused

Edited January 4, 2011 by KrazyKong

[mad082]

if it is supposed to have a 1.2 cap and you had a 0.9 cap then things may not have been working as effeciently as they could've and going to a 1.2 cap would be a good idea. on the other hand if it is only supposed to have a 0.9 cap then i wouldn't recommend going to a higher pressure cap for the following reasons: if you need it to sort out an overheating issue then you should try to find the actual cause of the overheating issue rather than bypassing the problem a bit. also if you raise the pressure of the cap then you are putting more stess on the rest of the system and may find that if there is a weak spot in the cooling system it will vent pressure there instead of the cap, which can result in blown hoses, etc.

but first you need to have the standard pressure of the cap confirmed, which i'm not able to do.

[KrazyKong]

I rang Nissan today and they said the standard cap in their system for all R33's is a 0.9. So I guess that settles things. It appears Nengun.com have incorrect info on their listing in regards to non turbos using a 0.9 and turbos using a 1.2.

Off to find a new SPAC cap then as it seemed well made. I'd love to get a Skunk2 cap as it's all nice and matte black, but it only comes in 1.3 I think.

[chocco]

If it has a .9 in it replace it with a .9

[KrazyKong]

If it has a .9 in it replace it with a .9

There's no harm in asking. Not when my heater core went... then my radiator going less then a few hundred kms later. And my cap isn't a stock one either, it's some aftermarket thing with Japanese writing on it. Thus I'm not going to assume anything, and instead felt it better to ask.

[ARTZ]

I bought a new aftermarket radiator for mine today and it came with a 1.1 cap

Im not sure if i should use it or not..