You Don't Know Jack!

How Kohr Motorsports Turns Engineering Savvy Into Race Wins

If you’ve ever bolted parts onto your Mustang and sworn it “felt faster,” this conversation is going to challenge you in the best way. We’re joined by Dean Martin, owner of Kohr Motorsports and a longtime force in Mustang road racing, plus Chandler Wheat from the Roush Performance team, who lives in both worlds as a portfolio manager by day and a GT4 tire engineer by night. What starts as two “I kind of fell into it” origin stories quickly turns into a masterclass on how real speed gets built, tested, and protected in pro racing.  We dig into the relationship between driving and engineering: how a driver learns to describe what the car is doing, why that translation is gold to an engineer, and how the wrong change can waste a session if you’re not honest. Dean and Chandler also get specific about vehicle dynamics and suspension setup, including why “lower and stiffer” isn’t automatically better, how sway bars can be misunderstood, and why coilovers are about corner balance and crossweight, not just closing wheel gap. Dean shares one of the most overlooked steps after lowering a car: neutralizing suspension bushings so you don’t bake in preload that hurts ride, grip, and alignment.  From there we zoom out to the part fans rarely see: motorsports logistics. Flights, hotels, tools, wraps, parts, prep, and the chaos of race weekends where a tiny failure can flip you from hero to zero. Dean walks through Kohr Motorsports’ recent plans, teething pains with new cars, A/B testing old vs new hardware ahead of Mid-Ohio, and the emotional swings that define IMSA and GT4 racing, from perfect races that still get stolen to wins you never forget. If you enjoy Mustang GT4, IMSA racing, race team management, tire testing, and practical performance engineering, hit subscribe, share this with a racing friend, and leave us a review. Let us know what you'd like to hear about next! [https://www.buzzsprout.com/2264353/fan_mail/new]

Behind the Northville Concours: Car Culture, Community & Future of Automotive Events - YDKJ 11

What does it take to build one of Michigan’s most talked-about car shows from the ground up? In this episode of You Don’t Know Jack, Jack Roush Jr. and Josh sit down with David Kibbey and Drew Lehnert of the Northville Concours to break down the story behind the event, how it’s grown year-over-year, and why it’s quickly becoming a staple in the Detroit car scene. They cover: * The origin story of the Northville Concours and how it started * Key highlights and momentum from recent shows * What’s coming next and the long-term vision for the event * The evolution of Detroit car culture and why it remains strong * How younger enthusiasts are reshaping the automotive community This episode also dives into the personal stories behind the builders, organizers, and enthusiasts driving today’s car culture forward. If you’re into performance vehicles, car shows, or the future of automotive culture in Michigan and beyond, this conversation provides a clear inside look at where the industry is heading. Listen now to understand why the Northville Concours is more than just a car show—it’s a growing movement. Let us know what you'd like to hear about next! [https://www.buzzsprout.com/2264353/fan_mail/new]

Sketch. Rev. Repeat. The Creative Side of Roush

Step into the hidden world of automotive design as we uncover the creative genius behind Roush's most impressive vehicles. Kevin and Dhruv from Roush Creative Services—the 65-person team responsible for transforming concepts into head-turning reality—reveal how they blend artistry with engineering to create machines that perform as spectacularly as they look. Ever wondered what separates truly exceptional vehicle design? According to our guests, the secret lies in evolutionary rather than revolutionary changes that honor brand DNA while pushing boundaries. The Roush F-150 exemplifies this philosophy with its innovative integrated lighting that brings the Roush brand to life without abandoning the signature elements loyal customers recognize. This delicate balance of tradition and innovation creates vehicles that remain visually compelling decades after their release. What truly distinguishes Roush Creative Services is their comprehensive approach—from initial sketches and 3D modeling to full-size prototypes and production-ready designs. Their work extends far beyond what most imagine, encompassing everything from high-performance Mustangs and F-150s to boats, aircraft, and even spacecraft for major companies. This diversity of experience enriches their automotive designs with perspectives that wouldn't emerge in a more narrowly focused studio. The future of design at Roush embraces cutting-edge technology like VR modeling and AI-assisted rendering, not to replace human creativity but to amplify it. These tools allow designers to explore more possibilities faster while ensuring the human touch remains central to every Roush vehicle. After all, as Kevin and Dhruv explain, creating something that makes you look back after parking—that head-turning quality that defines a truly exceptional design—remains an art beyond what technology alone can achieve. Subscribe and follow us on social media to continue exploring the innovation, engineering and raw passion behind everything Roush creates. The design journey from sketch to showroom is just one fascinating aspect of the Roush story we're excited to share. Let us know what you'd like to hear about next! [https://www.buzzsprout.com/2264353/fan_mail/new]

Fast, Furious & Fueled By The Future

Welcome to the You Don't Know Jack! podcast, the official Roush Performance podcast!  In today's episode, we're exploring how performance and sustainability aren't just coexisting, but actually working together to define the future of transportation. Your hosts Jack Roush Jr. and Josh Massab are joined by Todd and Chelsea from Roush CleanTech. We explore how the same engineering that's helped Roush become the winningest name in racing is also bringing value and safety to communities around the country. From the groundbreaking engineering advancements to stories of drag racing school buses, strap in and join us as we explore the future of transportation at Roush. Let us know what you'd like to hear about next! [https://www.buzzsprout.com/2264353/fan_mail/new]

Roush Manufacturing: The Magic Behind The Curtain

Welcome to the You Don't Know Jack! podcast, the official Roush Performance podcast!  In today's episode, we're pulling back the curtain on Roush's manufacturing magic with Brad Rzetelny and Nick Collins, two of the masterminds behind the scenes. Rzetelny and Collins share their backgrounds and provide insights into Roush's flexibility in handling diverse projects, from military vehicles to electric and autonomous vehicles, and even supercars. They highlight the company's commitment to quality, the importance of a robust team, and the adaptability required to meet the needs of both OEMs and startups. The conversation also touches on the challenges of rapid technology changes in the industry, notable projects such as carbon robotics and Bollinger motors, and future trends, including the EV and aerospace sectors. From the latest tech advancements to the challenges and triumphs of memorable projects, this episode is one you don't want to miss. Let us know what you'd like to hear about next! [https://www.buzzsprout.com/2264353/fan_mail/new]