Well, this is a bit different.

Let's be honest, power is easy to make these days. Anyone with a modest budget can build a 1000hp dyno queen, but what about high-output engines that are expected to last for more than just a few full-power dyno pulls?

Mixing a unique roots style blower (aka supercharger) with 8-into-1 headers for wow factor, Mitch Pullen of Pullen Spec Engines hasn't glossed over the essential parts to ensure this LS-based build will last. Improving rod angle, slowing piston speed, and choosing a stout valvetrain option over pure peak HP figures are all part of this, along with running a dual DBW throttle fuel-injected setup with 16 injectors over the carburettors you'd typically see on a setup like this.

Why roots type blowers are considered so inefficient compared to other supercharging and turbocharging options is discussed, along with individual cylinder trimming and running rich 0.80 lambda of E85 fuel to help cool combustion charges for 8 PSI of boost, making an easy 800hp during the Garrett International Drifting Cup at World Time Attack Challenge.

Specs:
- Haltech NEXUS R5 VCU (PDM & ECU), iC-7 dash, CAN keypad & TCA-8 thermocouple amplifier
- Detroit 2-stroke Diesel 8V92 roots truck blower
- Dart Machinery LS based block
- LS1 Cylinder head (Why? That's discussed!)
- 1360cc injectors 90-95% of fuelling
- 450cc used for individual cylinder trimming and transient throttle tuning
- Callies Performance connecting rods
- CP-Carrillo pistons
- PSI valve springs
- Jesel Valvetrain pushrods
- Ferrea Racing Components stainless hollow intake and Inconel exhaust valves
- G-Force Transmissions 4-speed H pattern gearbox
- Quarter Master NASCAR style clutch
- Winters Performance Products quick change rear differential
- PWR Advanced Cooling Technology rear-mounted radiator (for weight distribution & traction advantages)
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TIME STAMPS:
0:00 - Blown S13
0:30 - Why The LS
0:54 - Roots Blower
1:38 - Haltech NEXUS R5
1:55 - PDM & Can
2:26 - 16 Injectors
2:58 - Primary Injectors
3:05 - Fuel Cooling & Lubrication
3:12 - Trimming Injectors
3:20 - Liquid Intercooling
3:55 - Why A Roots Blower Is Considered Inefficient
4:24 - Boost Pressure
4:58 - Pre Supercharger Fuelling
5:28 - Ethanol Fuelled
5:35 - Fuel Mixture & Cylinder Trims
6:12 - EGT-Based Fuel Trims
7:45 - EGT Temperatureres
8:03 - Transient Throttle Tuning
8:32 - Acceleration Enrichment
9:23 - Short-Term Fuel Trims
10:47 - LS Engine Specs
11:14 - Why Short Stroke?
11:49 - LS Rod To Stroke Ratio
12:43 - Dart Block
13:30 - Power Level & 8,800 RPM
13:55 - Cylinder Head
14:30 - Rectangle Vs Cathedral Port
15:06 - 8 into 1 Header
15:42 - Thanks Mitch!
15:47 - Braaaaaaappppppp!
16:37 - BUILD | TUNE | DRIVE