2012+ Coolant System/Overheating

Spooler

Look at the thread before. Yes it supports the A/C. I would never disable my A/C either. Here is the source of the radiator.

https://www.rhdjapan.com/hpi-radiato...airlady-z.html

PogiFlip

Seems this is the best choice at the moment out of all the options even with the lack of reviews. Do you have personal experience with this?


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Spooler

Not at the moment. Seeing if Kamispeed can get them.

PogiFlip

Update. I called up Fast Intentions and Specialty Z to get acquainted with some of the folks. Specifically, I spoke with Kevin from FI and Greg from SZ. Kevin essentially referred me to Specialty Z to get the maintenance related work done since they are busy until late in the year (not surprised considering the quality products and great customer service I heard about). This and also they mostly focus on manufacturing than mechanical work. He couldn't really validate the coolant gurgling from turbos without seeing the car in person, I figured I'd ask since they installed the kit. Regardless, I'm not too concerned about the gurgling anymore.

Speaking to Greg, I mostly focused on the overheating. What he basically told me was to check over the current stock radiator for any clogs and replace anything as necessary and custom ducting to force air into the radiator and/or intercooler which should be a great help to cooling, especially on the highway. This would take a couple days and would be done with a partner shop that focuses on fabrication. He explained to me that the aftermarket radiators are not as reliable and may be even worse since these radiators are thicker vs OEM. Simply put, the radiator should be thin and have wide area for better airflow vs thicker radiators which supposedly restricts airflow.

Both Fast Intentions and Specialty Z say that most of their customers who are FI have the stock radiator, Fast Intentions specifically told me about 90% of their customers. Both have told me that the aftermarket rads are subpar.

With that being said, I was told to consider that I live in a pretty hot environment vs their other customers. Hence, check the current setup first and see if that helps. Consider the ducting and also upgrade fans if stock fans are not enough. I also mentioned the recent Japanese radiator by HPI to Greg and he wasn't familiar with this radiator but the same rules still apply. Quick fun fact, Fast Intentions does not offer CSF radiators as an upgrade ever since the AC leak issue occurred on this car with the previous owner. They use the stock radiator by default as stated above.

In terms of checking the EcuTek tune for fan speed, Sebastian told him that my tune was setup the same as his 370z as he remembers the car well when he tuned it. Even then, changing the tune to make the fans kick on earlier won't help much at all and the overheating will still happen. So I guess that idea is out the window.

On that note, after speaking to them at length over the phone, both Fast Intentions and Specialty Z have been very patient with me answering all my questions with the best of their ability. They seem to have a lot of knowledge about their products and the Z's which is expected. Definitely will be going with them for the major maintenance work of the TT kit.

I figured I'd share this info to the rest of the owners here while I look into my coolant system. Will keep posting updates as they come.


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PogiFlip

Also, I wanted to add. It seems there's a thread in the for sale section where one owner had some experience with the HPI radiator. May have some useful info as I saw some recent people requesting experience with this radiator and no luck. Maybe he would be willing to provide input. Here: FEELER: HPI Rescue Evolve Radiator


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Spooler

That sale thread helps, guess factory is all we have. Will have to optimize airflow as was stated by FI and Specialty Z.


CRAP!!!

Jhill

Not sure if this was mentions as I just skim read through this post and did not see it but I believe the stock z radiator cap is about 14psi (Just going from memory and would have to actually check) which is pretty typical for NA but is a little low to what I normally see for stock turbo cars it's more typical to see 18-20ish psi. This raises the boiling point of the system. The risk becomes wether or not the stock z cooling system can take the extra pressure.

Just something to think about if not already mentioned or done.