Twin-turbo Holden 308 LX Torana at Drag Challenge 2019 – Video

Ryan Featherstone bucks the LS trend with a force-fed Holden 308

Photographers: Shaun Tanner

FORCE-fed V8s are as common a sight at Street Machine Drag Challenge as a pair of drag radials, with bent-eight big-block Chevs and LSs always putting on a strong showing at the front of the field.

Ballarat’s Ryan Featherstone decided to sidestep that trend, opting to overlook the LS or Chev alternative and strap a set of hairdryers to a trusty ol’ Holden 308 instead.

“I got the car when I was 15, and I originally went with the 308 instead of a SBC so I didn’t have to get an engineer’s report for the V8 swap,” says Ryan.

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The red WB 308 block still runs the standard crank, spinning A9L rods and hypereutectic pistons with 8.5:1 compression, held in with a pair of ported HQ heads on top of Cometic head gaskets. The cam was changed before Drag Challenge for a Clive Cams hydraulic flat-tappet unit.

Being the owner of Race Pipes in Ballarat, Ryan did all the fab work for the turbo kit in-house.

“I made all the plumbing for the intercooler and intake, the pipes, catch cans, thermostat housing, overflow, shifter surround, fuel cell; I even shortened the nine-inch,” he says. “Anything I can, I build myself.”

Bolted to the side of the Aussie V8 mill is a pair of GT35 China specials straight from eBay, with brains from a MicroTech LT15C ECU running PULP 98. “We’re not sure on power because we couldn’t get a proper reading, but it should be around the 420rwhp mark,” says Ryan.

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The rest of the driveline consists of a Trimatic ’box with a 3300rpm converter, while a nine-inch diff with 3.25:1 gears gets the power to the ground.

The car’s fresh paint is a replica of the original colour scheme, but back when Ryan was still a naïve teenager the LX got a rub back and coat of bright yellow acrylic, until he decided to give it a birthday and return it to standard before Drag Challenge.

Taking on the new Tuff Mounts 235 Blown class, Ryan had a successful week with a string of solid passes. Low 11s over the quarter and a sub seven-second pass at Portland’s eighth-mile was good enough to yield Ryan eighth spot in the highly competitive class.



Class: Tuff Mounts 235 Radial Blown

Engine: Holden 308

Turbos: Twin eBay GT35

ECU: MicroTech LT15C

Transmission: Trimatic

Converter: SDE, 3000rpm

Diff: 9in, 3.25:1

Drag Challenge PB: 10.77