Sneak Peek: Killer B Motorsport’s KILRB1

by Khiem Dinh


Those who race a Subaru know the name Killer B Motorsport. They likely have a number of Killer B parts on their car such as the engine saving Killer B oil pickup which replaces the failure prone OEM component. Aside from their oil related products, Killer B is well-known for their unique and highest performing Holy Header too. KILRB1 is the car all those parts were developed on and if you hurry, it can be yours.

The car is currently up on Ebay with the auction set to expire on July 22nd. There are so many go-fast, high-power, and reliability parts on this car- it’s ridiculous! As it was the development car for Killer B, it basically has every Killer B Motorsport part on it. We’re going to give you a little sneak peek of what some lucky buyer will get. 


KILRB1 has this unique low-mount turbo kit which utilizes the modified Holy Header.

The Holy Header has a number of very important design features with material selection being the first using 321SS instead of 304SS. By using mandrel bent tubes, Killer B minimizes the number of weld joints which improves reliability. The merge collector is a cast piece, instead of fabricated, allowing for optimized design of the flow paths to maximize power. The wastegate placement is at a good angle to the flow to allow precise wastegate flow control. The Tial turbine housing is Swain Tech ceramic coated for thermal management and improved performance. Notice that with the low mounting location of the turbine, the downpipe coming off the turbine housing is nearly a straight horizontal pipe reducing back pressure. The downpipe transitions from round to oval to maintain flow area while maintaining ground clearance. 

The turbo sits very low, and the exhaust dumps out behind the front tires resulting in very low back pressure. The header is also Swain Tech coated. Of course, KILRB1 has the high performance oil pan. A Mocal heavy duty scavenge pump is required for the oil drain due to the turbo being so low. 


Due to the location of the turbo, a 4” intake tube wouldn’t fit on the compressor housing to the Garrett GTX3582R. So, Killer B machined up this custom adapter to go down to a smaller intake tube. 


This is the adapter bolted to the modified compressor housing. Notice that the inlet is larger than the wheel inducer and does not restrict flow at all. The design of the adapter is actually very similar to what is used on big diesel turbos like those used on the Ford Powerstroke and Chevy DMax, where the ported shroud geometry is covered from incoming airflow. A slot is kept between the inlet adapter and wheel inducer to allow recirculated airflow from the ported shroud to go back to the inducer of the compressor wheel, which allows the ported shroud to keep on functioning and prevent compressor surge. 


The modified compressor housing with the custom reduced diameter inlet is also shorter than stock. 


Page 1 of 3 Next Page
Bookmark and Share
Wednesday, July 19, 2017 1:34 PM
not hating on the car in any way, but unless we know when that thermal intercooler pic was taken, its completely useless. My stock Evo X intercooler looked exactly the same before a pull, down to the hot radiator peaking out from behind...

Wednesday, July 19, 2017 7:39 PM
I guessed the image was taken between runs as the radiator is showing much hotter than the IC. On the warmside of the IC, it is pretty even color from top to bottom. So my thought was it heated up fairly evenly due to a good flow distribution resulting in the evenness on cool-down. It is a hypothesis to be fair.

Your vid is interesting. Stock Evo X IC? Looks to have very even distribution. The Evo X I used the Fluke thermal imager on had an aftermarket IC and the distribution was not as even.
Mike Kojima
Mike Kojimalink
Wednesday, July 19, 2017 8:34 PM
I really like the turbo system, it is right in so many ways and fixes a bunch of stuff I don't like in a turbo Subaru, shortens the distance to the turbine and shortens the charge pipes right up. Gets the hot stuff down low were it can't mess stuff up, cleans up the exhaust routing, gets the heavy turbo down low. Wow I can go on and on. This makes almost twice the power of my car!
Wednesday, July 19, 2017 10:41 PM
Yup, the airflow path is very short on both ends of the engine. The air basically exits the turbo compressor housing, makes a 90 degree turn, and goes straight into the intercooler. I'd guesstimate 8" of length.
Thursday, July 20, 2017 1:45 AM
Yes, stock intercooler, actually everything was stock in that vid. The car is less than a month old, getting my baseline runs in. That was the first pull after the car sat in the parking lot for a while on a cool morning. The intercooler didn't cool down much between runs even with a giant dyno fan on it, hence the water spray in the other 2 vids.
In the thermal pic of the Subi above, the intercooler is almost the same temp as the bumper. Which tells me it's either before the first pull or it's had a very long cool down, like 30 min plus.

I agree with both of you on the turbo setup, I love how they did it. It's almost as if Subaru saw this while developing the FA in the current WRX and decided to copy the general idea, except with the turbo in front of the engine and still keeping a top mount.

Btw, you guys should do a feature on KillerB's catch cans. They have a couple that are priced ridiculously ($5-600) and I need to know what makes them so good that they can charge that much. Kinda annoying me that I can't figure it out, haha
Thursday, July 20, 2017 9:54 AM
I can ask Killer B about doing a Nerd-O-Scope on it. I have an idea of how it works, but I haven't spent the time to really analyze it as it's a full system type of deal.
Sunday, July 23, 2017 10:23 AM
@warmmilk, I looked at pics of the Killer B air-oil separator for a while last night. I figure the cost is due to the fact pretty much every part is machined from billet. The body is machined from a chunk of aluminum. The three hose barb fittings are custom designed by Killer B (hose barb geometries) and are custom machined. So basically, the entire thing is custom machined. Then there's the hand welding required and time for welders ain't cheap!
Monday, July 24, 2017 3:53 PM
well there's also the cone shape and no media (steel wool or whatever) in it with claims that its the best catch can out there. So the design of it requires the machining and expensive manufacturing process. I got the sense that its machined that way out of necessity for its performance and not just to look pretty.
My question is does it really perform better than other quality catch cans out there that are a fraction of the price. Something like a Bob's Auto Sport catch can which is $130...
Monday, July 24, 2017 10:39 PM
Well, I have the Saikou Michi on the s2k :) Anyway, with the Subaru air-oil separators, they all drain back into the engine and also suck from the two heads of the engine. And yes, the shape of the Killer B air-oil separator is fundamental to how it functions. Many of the WRX air-oil separators (Perrin, Crawford, IAG) are in the $400 range.
Tuesday, July 25, 2017 11:01 AM
You can setup the BAS catch can to drain back into the engine, and even if you get 2 of them, one for each head, still significantly cheaper...
Monday, July 31, 2017 4:07 PM
I hate to break it to you Khiem.... but those Recaro Sportster CS seats don't fit very well in an S2000. Due to the size of the cabin of an S2k, and the dimension of the Sportster CS seats there isn't much adjustability with the seat, so it leaves you with a pretty awkward angle.
Monday, July 31, 2017 6:26 PM
Well, that makes me a bit sad as I love how those Recaro's feel sitting in them. But on the flipside, it makes me a bit happy because I'll save a lot of money not buying them.
Post Comment Login or register to post a comment.

MotoIQ Proudly Presents Our Partners:

© 2018 MotoIQ.com