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Old 02-12-2018, 05:16 PM   #1
fredrik94087
Scooby Specialist
Member Sales Rating: (2)
 
Member#: 337075
Join Date: Nov 2012
Chapter/Region: BAIC
Location: San Jose, CA
Vehicle:
2015 WRX Stg3 SOLD

Default Killer B Motorsport Performance Radiator for 2015+ WRX

For now this review is just on quality and fitment as I have not had any track days since install. Should that happen, I will update.

Quick background:
I tried the Koyo Racing Radiator a while back and had serious fitment issues with factory fan and shroud. It required a slim fan. I learned that the slim fan with no shroud was no Bueno. I found a slim fan with shroud, but decided not to go that route.

I stayed with factory radiator/fans/shrouds for cooling until I got a sleeved block. The sleeved block gets a little bit hotter than the factory block. I already had a Perrin thermostatic oil cooler. I contemplated upgrading the oil cooler but was advised by some with a lot more experience to upgrade my radiator cooling.

This is where the KB unit came into play. It is (this may be an exaggeration...but) only millimeters thicker than the factory unit. You can read all about the core on the KB site.

Previously, I had chosen to swap my Grimmspeed Charge Pipe for a Perrin Charge Pipe for clearance. The GS pipe's rubber coupler is close to the factory fan motor, and moving that fan any closer would be an issue IMHO. The Perrin pipe with factory radiator had visibly more space.

Still, when the KB radiator was installed, the Perrin pipe had to be pushed further in toward the GS TMIC, but it all worked out well.

My installer was very impressed with quality, welds and fitment. In his opinion, the $1500 price was on par with the radiator he got for his race truck.
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Old 02-13-2018, 01:47 PM   #2
JarHarms
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Member Sales Rating: (51)
 
Member#: 138994
Join Date: Jan 2007
Chapter/Region: MWSOC
Location: DeKalb-ish, IL
Vehicle:
06 WRX Ltd
SGM

Default

Appreciate the review since I was interested in one of these. Although this is a $1500 built-to-order radiator so an installer's impression leaves me lacking... I guess it sure as heck better be nice and install with ease. This sort of radiator isn't one to compare to Mishi, CSR, Koyo, etc. radiators though. This seem more race purpose price point.
Killer B's web-store installed photos are nice and all but... I wish they provided more photos of the radiator itself so one could determine if it's worth the time calling in for more specific details.
No GD-version installed photos?
No idea what low-mount means (but I have an idea)?
Fan assembly mounts are threaded boss instead of tapered screw (usual aftermarket fare).
What does it have for a drain plug, how is it located?
Does it have provisions to mount all of the OEM coolant pipes, or not?
Are the overflow and deaeration nipples welded in alloy or are they threaded in fittings?
For that price, does it come with a pass-through heat exchanger built into the lower endtank?
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Old 07-11-2019, 10:16 AM   #3
KillerBMotorsport
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Vendor Sales Rating: (43)
 
Member#: 198281
Join Date: Dec 2008
Chapter/Region: MAIC
Location: Virginia
Vehicle:
2005 WRX/STi
WRB of course

Default

Quote:
Originally Posted by JarHarms View Post
This seem more race purpose price point.
The price point is due to the core that is used. Cores are very much a get what you pay for component in regards to process, design, and materials... and in turn thermal efficiency. Since we do not use 'mega thick' cores this radiator does not need to be going 100mph before it becomes efficient. Brake boosting during auto-x and loaded (no blowers) dyno time is going to be the most grueling thing you can do to a radiator, which we've done.

Quote:
Originally Posted by JarHarms View Post
No GD-version installed photos?
Fan assembly mounts are threaded boss instead of tapered screw (usual aftermarket fare).
Does it have provisions to mount all of the OEM coolant pipes, or not?
Are the overflow and deaeration nipples welded in alloy or are they threaded in fittings?
The radiators are fully compliant with OEM mounting, fans, fan shrouds, and hardware. They do NOT have the bosses for mounting an auto trans cooler like the OEM radiators; just because we really don't see auto trans used on high HP racing applications.


The radiators are thicker than OEM, but depending on the version, are no more than 2" thick.

Quote:
Originally Posted by JarHarms View Post
No idea what low-mount means (but I have an idea)?
What does it have for a drain plug, how is it located?
For that price, does it come with a pass-through heat exchanger built into the lower endtank?
Low mount is a narrow version that leaves space for mounting a turbo low and in front of the engine.

There is a petcock for draining in a similar location as OEM.

No dual exchanger. I've seen too many dual exchangers fail to go down that road. It's convenient for packaging, but the downsides outweigh the upsides in my opinion. Real racecars want improve reliability, optimized efficiency, and often have packaging constraints due to other modifications. So a dedicated remote oil cooler is more often than not a more efficient layout and offers more versatility in regards to mounting choices. Keep in mind, race teams often remove components (weight) they do not need, so a team may reduce or remove an oil cooler when going from summer to winter events.


Much like many of our other products, the purpose of this radiator is to provide high end racing technology to the general Subaru community and privateer track guys. I don't often recommend it because the price point is so high, but it is the hammer when no other tools will work.
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