Koyo Hyper V-Core?
The previous owner of my car fitted an ASI (Chinese) 52mm radiator, I'm looking to swap to the VH060650 for a more efficient core.
Anyone have any real world track experience with these new 2015 Koyo Hyper V-Core radiators? Cheers |
Originally Posted by timk
(Post 1225125)
The previous owner of my car fitted an ASI (Chinese) 52mm radiator, I'm looking to swap to the VH060650 for a more efficient core.
Anyone have any real world track experience with these new 2015 Koyo Hyper V-Core radiators? Cheers So overall, and sort of generically, I put the Hyper V halfway between the old 37mm Koyo and a good Crossflow. |
Thanks Emilio, I appreciate the honest reply.
|
2 Attachment(s)
Smartass content:
I support any Miata cooling product which has the word "Hyper" in its name. Serious content: Not knowing what a "Hyper V-Core" radiator was, I googled it and landed on Koyo's "Radiator Technology" page. There I found a description of their "N-FLO Technology" (multi-pass radiator.) To wit: https://www.miataturbo.net/attachmen...ine=1430339841 Allowing coolant to remain in the radiator for a longer period of time?"This is Koyorad’s N-Flo Technology which allows for a double or triple pass radiator. This design cools more efficiently by allowing the coolant to remain in the radiator for a longer period of time therefore transferring more heat to the surrounding air." Last time I checked, the amount of time coolant remained in the radiator was governed by only two factors:
Now, having worked in the corporate equipment-manufacturing world myself, I understand that there is a large disconnect between Engineering and Marketing. But still... Am I missing something? |
Originally Posted by Joe Perez
(Post 1227520)
Am I missing something?
|
Originally Posted by adamiata
(Post 1227525)
No. The water will travel farther though the radiator at a higher speed.
Now, I'll be the first to admit that I don't understand the justification for running a multi-pass radiator over a conventional one. Both have the same active area and the same volume, and should perform equally. Yet some people staunchly support the idea that multi-pass radiators offer a performance advantage, at least in some conditions. Is there a solid technical justification for this, or are multi-pass radiators a gris-gris? I have no idea. |
But that water molecule has to take a longer path between the inlet and outlet. So a higher linear speed within the core tubes.
But you're right, the literature is wrong. |
Hyper-V not to be confused with N-Flo, multi pass or whatever it is. Hyper-V is simply more FPI, (Fins Per Inch). Rest of the radiator is the same as the old V&R series rads. For most motorsports oriented radiators in production based cars (given pressure gradients, temp deltas), 18-21 FPI is sort of the sweet spot in fin density. The previous Koyos were about 14FPI. With the Hyper-V Koyo enters the modern era where all purpose built, higher end radiators are using 18-21 FPI.
Our crossflow, TSE, FM, PWR, Ron Davis, C&R are all in the 18-21FPI range. https://38.media.tumblr.com/f0f59540...fdho1_400.gif? |
Originally Posted by adamiata
(Post 1227541)
But that water molecule has to take a longer path between the inlet and outlet. So a higher linear speed within the core tubes.
But you're right, the literature is wrong. |
Originally Posted by emilio700
(Post 1225989)
So overall, and sort of generically, I put the Hyper V halfway between the old 37mm Koyo and a good Crossflow.
robert |
FWIW I have the old Koyo 37mm, and have a really hard time with temps just driving on the freeway here in phoenix. If it's 100°F or higher, I'm gonna see 220 if I have the AC and I'm not really comfortable with that. My hood vent helps, but it's not enough area by itself. I I'm not keen to cut more holes though, because I park my car outside. I logged it coming home from work for a week before the vent, and then again after and I think it’s given a 2-3° improvement. The biggest help I saw so far was from sealing the OEM fan shroud to the radiator using aluminum tape. That was good for about 5° by my observation. If I could do it again I would have bought the 53mm koyo. |
Originally Posted by emilio700
(Post 1227551)
Hyper-V not to be confused with N-Flo, multi pass or whatever it is.
(And I got a pretty good chuckle out of the GIF.)
Originally Posted by Leafy
(Post 1227557)
The higher linear speed is the good part here. Makes for a higher reynolds number.
I'd love to see some hard data that compares the heat transfer potential of two otherwise identical radiators back to back. |
Originally Posted by robertcope
(Post 1227670)
Does this mean that you won't be making more Crossflows? Should I auction my NOS Crossflow off? :)
robert |
Originally Posted by emilio700
(Post 1227704)
Crossflow is still go. Just no ETA. Had to fire the original engineer. Good work but seriously overbooked himself. It's all in house now and moving forward.
|
Originally Posted by scenturion
(Post 1227706)
Wow, are that many design changes needed? I should upgrade from my v1 to v2 when it comes out ;)
|
I'm now at the crossroads of needing a radiator and as the 949 is on the undefined hiatus I'm looking at this Hyper V Koyo unit and FM's version of the crossflow. My wallet wants the Koyo, but I don't want another situation where $100-200 would have saved me downtime and irritation.
|
TSE
|
2 Attachment(s)
I haven't had a chance to install this yet but there's not many pics out there showing the Hyper V core, so here we go:
https://www.miataturbo.net/attachmen...ine=1433040897 https://www.miataturbo.net/attachmen...ine=1433040897 Hopefully this thing works better than my old radiator! Cheers |
Our revised Crossflow was put back into production a few weeks ago but is still probably 10 weeks away. Long lead time. Revisions are to make it fit better and allow NB's to retain A/C. Not taking pre orders until they are in port. Website will have a "buy" button when we do so.
Meanwhile, here is a pic I took of the NA Hyper-V http://949racing.com/images/products..._NA_Miata.jpg? |
Sorry to resurrect an old thread, but I have this radiator on my NB. Last night I noticed it has what appears to be a bung for a temperature sending unit right next to the water inlet. Is this a good place to get a reasonably accurate reading? Obviously, closer to the engine would be better, but I haven't done a reroute yet and I don't want to screw anything up.
If so, does anyone know what size/thread dimension it is? I want to replace my factory temp gauge with something that's accurate and has numbers, and this seems like an easy way to do it. ** Never mind. I think it's 1/8NPT since apparently that's what they put on all their other radiators. It'll work for now. |
All times are GMT -4. The time now is 02:52 PM. |
© 2024 MH Sub I, LLC dba Internet Brands