*** We’ll be taking a break over the Christmas/New Year period and will be back in action mid-January.

That means that although there won’t be any new episodes for a few weeks, we’ll be taking another look back at some of our favourite episodes. ***

Few people know more about ultra-high-performance engine building than this week’s guest, Terry Radbourne of Bourne HPP. In this episode, we’re going to be discussing topics like creating engines for LMP1 and Mercedes’ F1 team, truly getting the absolute most out of Honda’s K series motor, as well as the odd controversial opinion that’s sure to get the comment section fired up.

👉 Use the code ‘PODCAST500’ to get $500 OFF HPA's VIP Package: https://hpcdmy.co/podvip

Terry brings an intriguing mix of expertise and insider knowledge — straight out of school, he found himself working for Advanced Engine Research and quickly became involved in some seriously high-end race engine design and building work. After a few years spent honing his craft — including a stint creating engines for the Mercedes Formula 1 team, Terry went on to found his own company, Bourne High Performance Powertrains, or Bourne HPP for short.

Bourne HPP specialises in designing and building seriously aggressive motors — most commonly of the Honda K-series variety in both naturally aspirated and turbocharged forms. This allows us to dive very deep into the intricacies of four-cylinder engine building, and time is spent discussing intake port design, cylinder sleeves, compression ratio, and a whole lot more.

We also get stuck into the K-series motor itself, and Terry spends time talking us through exactly why he thinks this is one of the best engines ever produced and how to get the most out of it. As Bourne HPP is something of a one-stop-shop that does everything from engine rebuilds, to NA and turbocharged crate engine packages, to dyno tuning with the use of Syvecs and Lyfe Racing ECUs, Terry has an absolute oversupply of knowledge that he’s (mostly) willing to share.

If you want to get smarter, this episode with Terry Radbourne of Bourne HPP is not to be missed.

👉 Use the code ‘PODCAST500’ to get $500 OFF HPA's VIP Package: https://hpcdmy.co/podvip

As mentioned in the podcast, you can listen to our episode featuring Syvec’s Ryan Griffiths here: https://hpcdmy.co/Syvecs

Follow Bourne HPP here:
IG: @bourne_hpp
FB: Bourne HPP
WWW: bournehpp.com

What would happen if you took an IndyCar inspired chassis, dropped a 1973 Pontiac Firebird body over the top of it, and then added a 1,450hp twin-turbo LS? That’s essentially what Cavan Cameron and his father, Russell Cameron, of Horizon Motorsport have built.

The project began as Cavan’s high school engineering project but has since evolved into one of the coolest and most ambitious builds we’ve seen in a while.

👉 Use the code ‘PODCAST500’ to get $500 OFF HPA's VIP Package: https://hpcdmy.co/podvip

In this episode of Tuned In, Cavan shares his journey from a childhood passion for cars to pursuing a career in motorsports engineering, sparked by his father’s involvement in IndyCar.

We dive into the “Hammerhead” build that Cavan and his dad have been developing, exploring the challenges of integrating genuine IndyCar components into a bespoke project. He breaks down the technical aspects of the tube-frame chassis, from fabrication and material choices to the complexities of suspension dynamics.

We cover the finer details of designing and developing a competitive race car, with a focus on suspension, engine configuration, and aerodynamics. The conversation also touches on the challenges faced during its first outing at World Time Attack Challenge, including managing torque through the transaxle and tuning the car for optimal performance.

This build is truly something special, and what Cavan has achieved is seriously impressive. We can’t wait to see how the car evolves as they continue to refine and dial it in.

👉 Use the code ‘PODCAST500’ to get $500 OFF HPA's VIP Package: https://hpcdmy.co/podvip

Follow Cavan here:

Instagram: horizon_motorsports_llc
Youtube: horizon_motorsports_llc

Timestamps:

0:00 A High School Project Gone Wild: 1,450HP IndyCar x Firebird
4:12 How did you become interested in cars?
5:21 What was your Dads involvement in Indy Car?
10:26 How’s the exposure to high level motorsport at a young age shaped your career?
11:53 Is it easier or harder to design parts with a tight set of rules?
16:10 Designing fit for purpose parts
18:58 Tell us about your motorsport degree
29:54 What is the Hammerhead and how did this project come about?
33:33 Did you design the car fully in CAD before starting?
39:27 How did you learn your fabrication skills?
42:56 How do you juggle getting the car done and completing it to a standard you’re proud of?
45:15 What material is the chassis made from?
50:58 How did you weld the chassis and get it square and straight?
55:11 How does changing the roll centre affect the car's handling?
59:01 Are the IndyCar spec’d fasteners adequate for the extra weight of your build?
1:01:30 How about the components like uprights and wishbones?
1:06:39 Spring rates and dampers, how did you spec these?
1:15:29 Did you ever consider putting a Cosworth XD engine in the car?
1:18:07 Was it ever a concern that the LS was going to have too much torque for the trans axel?
1:27:27 You’re not running any intercooler on this car?
1:32:54 How did you develop the aero package?
1:43:38 What’s left to develop on the car and when will we see it back on track?
1:46:41 Final 3 questions

There’s no arguing the Lamborghini Gallardo GT3 is no slouch. But the World Time Attack Challenge is a whole different league, and in standard form this factory race car is basically like bringing a knife to a gunfight. To run with the world’s best, it needed serious development—and that’s exactly what Josh and his team at Specialised Racing Solutions delivered, bagging P2 in Pro class on the car’s debut outing.

👉 Use the code ‘PODCAST500’ to get $500 OFF HPA's VIP Package: https://hpcdmy.co/podvip

In this episode of Tuned In, Josh Gardner breaks down his path from car-mad kid to professional mechanic and business owner. He gets into the hard parts of starting a workshop, and why custom builds are never as simple as they look from the outside.

Josh also reflects on the lessons learned from running a business, His work on the Nissan GTR platform and his return to the sharp end of the automotive world with the Lamborghini Gallardo GT3 build—including what it really takes to compete at the highest level at WTAC.

We dive into the nuts and bolts of performance development: turbo selection, installation, and the cooling challenges that come with high-output builds. The conversation also explores advanced engine management systems like MoTeC, the realities of CAN bus integration, and where technology is headed with the use of CAD, 3D scanning and 3D printing in modern performance builds.

Josh is packed with knowledge, and his story—from backyard tuning as a teenager on the family PC to building time attack cars capable of taking on the world’s best—makes for a seriously compelling listen.

👉 Use the code ‘PODCAST500’ to get $500 OFF HPA's VIP Package: https://hpcdmy.co/podvip

Follow Josh here:

Instagram: specialisedracingsolutions

WWW: srs.racing

Timestamps:

0:00 Building a Lamborghini Gallardo into a WTAC Weapon
3:33 How did you develop a passion for cars?
9:34 How did you develop your tuning skills at such a young age?
13:44 How hard was it starting your own shop?
16:17 How did you develop your skills on the GTR platform?
18:02 What skills did you have when you started the business?
30:50 How did you get back into the hands on automotive scene?
32:06 Overview of the current business
38:29 What was the drive to attend World Time Attack?
39:55 Why did you choose the Lamborghini Gallardo?
42:46 How much of an advantage has it been starting with a GT3 car?
43:59 What are the Pro Class rule limitations at WTAC?
50:59 What is the engine package on the Lamborghini?
55:16 What are you doing for the intercooler/intake setup?
57:11 How are the turbos set up on the car?
1:03:42 What suspension modifications have you done to deal with the increase in downforce?
1:06:04 What is the electronics package you’re using?
1:14:31 What changes are you going to make for next year's WTAC?
1:17:00 Nissan GTR GT3 car
1:18:47 If we compare the Nissan and the Lamborghini what are the differences?
1:20:06 Are you using any technology to develop these cars? CAD, 3D scanning, 3D printing?
1:26:48 How much improvement will you get from moving the GTR engine back and down?
1:28:52 Is the GTR almost ready for WTAC?
1:29:46 What do we need to leverage 3D scanning and 3D printing technology?
1:35:02 Final 3 questions