New Aluminum Coolant Overflow Tank - RX8Club.com



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Old 08-03-2016, 11:52 AM   #1  
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New Aluminum Coolant Overflow Tank

Let's face it, the factory RX-8 Air Separator Tank or AST being made of plastic leaves a bit to be desired. They have become brittle with age which often causes the cap to snap off or the tank to split causing leaks. This can empty the RX-8's cooling system very quickly causing overheating and potentially serious engine damage.


Our new unit is a direct bolt in replacement for the OE plastic unit and is compatible with completely stock (as shown) or with modified vehicles as well. During the design process we eliminated the annoying issue of the OE unit which allows coolant to overflow down and corrode the electric power steering system and fan connectors. These units are hand made here in the US and include a new radiator cap with a safer flip up style pressure relief.


To better suit your specific application and goals these are available with several additional options as well.


V-1 The basic model is a high quality tig welded replacement. This unit does not include a level sensor however by simply leaving the OE connector unplugged the dash light will remain off.


V-2 This model is the same as V-1 but includes a coolant level sensor providing normal dash light operation.


V-3 This model includes the level sensor and is ideal for those looking to reduce engine temperatures. It includes our cooling fan control kit built-in which will significantly reduce the operating temperature of your RX-8!


V-4 This model incorporates our cooling fan control kit as well as a coolant level sensor and also includes an additional tig welded bung. This is to allow the addition of a aftermarket coolant temperature or coolant pressure sensor to the cooling system! No more splicing into heater hoses!


Here is a link to the Air Separator Tank on our website.



Installed pic's:
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New Aluminum Coolant Overflow Tank-dsc01878.jpg   New Aluminum Coolant Overflow Tank-dsc01869.jpg   New Aluminum Coolant Overflow Tank-dsc01877.jpg  
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Old 08-03-2016, 06:39 PM   #2  
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Looking good, Scott. Can't wait to see it in person. I think this will help dress up the engine bay as well
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Old 08-06-2016, 09:26 PM   #3  
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Glad to see a option other than the factory plastic piece that gets brittle and can't remove factory coolant hoses.
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Old 08-11-2016, 01:57 PM   #4  
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Originally Posted by BigBadChris View Post
Looking good, Scott. Can't wait to see it in person. I think this will help dress up the engine bay as well
Thanks Chris! I agree, I think it adds a nice touch while eliminating a known failure point that renders the car inoperative.

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Originally Posted by gregs View Post
Glad to see a option other than the factory plastic piece that gets brittle and can't remove factory coolant hoses.



For those of you that have already purchased a unit from us, thank you, we appreciate your business and support!

These are in stock guys, ready to be configured to suit your application and shipped!
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Old 11-07-2016, 12:00 PM   #5  
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Hi Guys! We just finished another run of our Air Separator Tanks! Keep in mind these are not prone to the coolant level sensor issues of the OE unit! In stock and ready to configure for the options you prefer and ship!
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Old 01-17-2017, 11:58 AM   #6  
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Hi Guys,

We have just finished up another build run of these so they are in stock and ready to ship!

Feel free to purchase them through the website or email us directly:

[email protected]
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Old 07-06-2017, 04:07 PM   #7  
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Just finished up another build run of these guys, summer is upon us don't wait for the OE plastic unit to fail and create more costly issues! If you pick V-3 (the most popular version) you will also significantly reduce your engine operating temps!

Let me know if you have any questions, thanks, Scott
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Old 03-27-2018, 12:09 PM   #8  
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You got any of these bad boys in stock? I'm just waiting on my tax return and I'd love to pick one up once the cheque comes in. If not, what's the lead time, and you're still shipping to Canada, right?
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Old 03-28-2018, 09:50 AM   #9  
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You got any of these bad boys in stock? I'm just waiting on my tax return and I'd love to pick one up once the cheque comes in. If not, what's the lead time, and you're still shipping to Canada, right?
Hello bwilk,

Your timing is quite good as we just finished a build run of these and there are a few left not yet spoken for!

Which version are you interested in?

Yes, we still ship to Canada and the rest of the world as well!
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Old 04-03-2018, 06:27 PM   #10  
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Thank you Bwilk, email and order received! Thank you, Scott
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Old 04-23-2018, 12:28 PM   #11  
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Thank you Bwilk, email and order received! Thank you, Scott
Part received. I sent you an email re: some shipping weirdness. I also wrote a review after installing and a few drive cycles. You can read it here:
RX8Performance Air Separator Tank
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Old 04-23-2018, 10:38 PM   #12  
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This is the one from Pettit Racing that I have in my RX8 . Is this the same part folks?

AST Spec. A Kit RX8

Last edited by gwilliams6; 04-23-2018 at 10:40 PM.
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Old 04-23-2018, 11:14 PM   #13  
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Similar but not the same. The RX8Performance unit is a different shape.
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Old 04-24-2018, 10:08 AM   #14  
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Originally Posted by gwilliams6 View Post
This is the one from Pettit Racing that I have in my RX8 . Is this the same part folks?

AST Spec. A Kit RX8

Now that I actually looked at the Pettit offering, it's designed with the overflow nozzle on the same side as the RX8Performance offering. That and it's specifically said in the description here that the nozzle is pointed the way it is for a reason. I'm sure I read that at one point, but it's been a while since I actually looked at it, so I didn't put it together when writing my review

Last edited by bwilk; 04-24-2018 at 10:11 AM.
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Old 06-26-2018, 09:08 AM   #15  
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Hi guys

Thought i would try to get in touch with someone from RX8 Performance on here as my emails are being ignored
I would really appreciate some sort of contact considering I have purchased an AST from your website 3 weeks ago
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Old 07-05-2018, 06:04 PM   #16  
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Hi Rotorboy!


Please send an email to [email protected] so I can check your order for you!


Thank you, Scott
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Old 07-11-2018, 06:35 PM   #17  
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I ordered one also online about 2 weeks ago, no shipment, no communication. I have emailed and no responses...only thing holding up a car getting finished as I'm installing a rebuild and don't wanna have to break open the coolant system again just to do this.
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rx-8 ast, rx-8 coolant leak, rx-8 overflow, rx-8 radiator, rx8 cooling

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