‘09-‘11 vs ‘12+ coolant reservoirs
 

I was looking into getting a GK tech swirl pot to help reduce temps on my ‘09 370Z. It seems to be the consensus that the newer pressurized reservoirs do not need/benefit from this setup. I think it’d be a cleaner install to switch over to the newer coolant reservoir style instead of adding additional hoses in the engine bay to mount up a swirl pot with my early style reservoir.

Can anyone elaborate on the differences in the two styles/systems? Specifically, where does the bottom hose of the newer style reservoir lead? (This isn’t present on the early style) Am I right to think it’d be simpler/cleaner to change reservoirs instead of adding a swirl pot?

2009-2011 reservoir:
https://uploads.tapatalk-cdn.com/202...e7ca7af0a3.jpg

2012+ reservoir:

https://uploads.tapatalk-cdn.com/202...89ad32bf7a.jpg


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The updated resevoir uses a pressurized cap. The lower hose leads to a coolant hard line that connects the block and the heater.

I have the GKTech swirl pot... it's neat and does its job well. Install is a pain with the coolant line rats nest at the back of the engine so if you haven't removed your throttle body coolant lines, during the swirl pot install would be a great time to do so.

No benefit. Just keep whatever one you have. Stick with stock.

I’ve seen that the pressurized reservoirs don’t benefit (as much at least) from the swirl pot mod. The pressurized reservoir isn’t ‘swirling’ to separate air/water but it’s my understanding that it does pull from an extra source in the system to help remove air bubbles.




Yea I’ve heard install isn’t the easiest or cleanest thing in the world, which is what led me to this question originally. These cars have tight enough engine bays already. Good to note about the TB coolant lines. My car still has em, although I do drive my car in near/freezing temps as winter approaches before it’s garaged permanently.


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It's not difficult to route the hoses, just tedious, and it's not impossible to do it in a clean, uncluttered way. It just takes more time and effort than most people want to put in past the basic install. Plus, GKTech provides enough hose to route and hide them if that's what you want to do.

This. What temp issues are you having? There are really only one effective thing you can do without having to start cutting to reduce temps. Switch to water and an additive, I used Redline Waterwetter, it reduced it a few degrees. Next would be to change the radiator to something with a greater BTU output or cut/modify your bumper to increase airflow. I have serious doubts on how effective something like this is since a normal radiator already does this.

‘09-‘11 vs ‘12+ coolant reservoirs
 

No out of the ordinary temp issues. Saw the GK tech swirl kit but noted that some people say the install/extra lines in the tight engine bay are a pain. Seems like pressurized reservoirs are much better at self-bleeding whereas non-pressurized reservoirs retain more air in the system (from my limited research). Explains why the GK tech kit is worthwhile on the ‘09-‘11 cars, but I was just wondering the complexity/effectiveness of swapping to newer reservoir style instead of adding GK tech kit


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There's also installing an OE lower temp. thermostat P/N 21200-4W000 which lowered my 2010 all OE coolant system temp. 10*! Zero other cooling mods other than removing the weather stripping on the trays at the back of the hood to let heat escape. :tup: