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Welcome to WOT 🏁
Wide Open Throttle. If you’re here, you either know what that means — or you’re about to find out. Overdrive Originals is producing a new series called Race Support. We’re documenting the complete re-engineering of the rare and legendary BMW E53 X5 4.8is — from shop truck to fully built restomod. The build is happening at Esse Werks, a BMW/MINI performance shop in South Florida. This community is where you get everything the YouTube episodes can’t show you. What’s Coming → Full engineering data drops as every system gets specced → AI-assisted aero and livery design (The Vault) → Live fab sessions as the build progresses → Your input on real build decisions (VIP tier) → Your name on the truck (Premium + VIP) We’re at the starting line right now. Engine’s on. Hasn’t left the lot yet. If you want to be here from day one — before the first episode drops, before the first cut is made — you’re in the right place. How This Community Works WOT exists for one reason: to help you build smarter, stay accountable, and stop second-guessing in the garage alone. That only works if we’re all aligned on how we show up here. What This Community Is This is a place to: ∙ Share builds in progress — not just the hero shots ∙ Get honest, informed feedback from people who actually wrench ∙ Learn how others approach fabrication, tuning, sourcing, and problem-solving ∙ Build momentum through documentation and consistency You don’t need a six-figure build. You don’t need to post finished work. You do need to participate. What This Community Is Not This is not: ∙ A highlight reel ∙ A place to flex and disappear ∙ A “what exhaust should I get” forum ∙ A shortcut to clout If you’re here, it’s because you care about the craft of building — not just the result. How to Post (This Matters) When you share a build update or ask a question, always include: 1. The photo(s) or video 2. What you’re working on and where you’re at in the process 3. What specific input you’re looking for
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Post 1: Sourcing E70/F85 X5M Brembo Calipers — What I Found
SOURCING: E70/F85 X5M Brembo Calipers For anyone doing this swap — here's what I've found on sourcing the E70/E71 X5M/X6M Brembo caliper sets. New from BMW: Don't. The per-caliper price is absurd and there's no reason to buy new for a retrofit. Used sets: eBay, FCP Euro (check their used/core section), BimmerWorld, and local wreckers. Price range for a complete set of 4: $400-800 depending on condition. I paid $600 for the set going on the E53. What to look for: Check piston condition (should move freely, no pitting), bleed screw condition (they seize and snap), and pad slide pins. If you're rebuilding anyway (you should on used calipers), piston condition matters less but seized bleed screws can turn a rebuild into a nightmare. Where NOT to source: Random Marketplace sellers who pulled them from a flood car. Salt belt cars with heavy corrosion on the caliper bodies. Any set where the seller can't tell you which vehicle they came from. Budget $800-1,000 for caliper rebuild and powdercoat on top of the purchase price. KD Powdercoat is handling ours. Has anyone sourced these from a different channel? Better price? Drop it below.
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Post 2: The Spare
The Spare 79,000 miles. Sourced from A-1 Auto Salvage in Merritt Island. This is the foundation for the Stage 2 engine build. Right now it's sitting in the corner of the shop waiting for its turn. Most people walk past it every day and have no idea what it's going to become. That's the thing about builds — the most important parts spend months looking like junk on a shelf before they become the centerpiece.
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Post 2: Livery Concepts — First Round
LIVERY CONCEPTS — First Round Before the widebody kit gets finalized, the livery design runs in parallel. The truck's final look is a combination of the body shape, the color, and what goes on top of it. We're exploring several directions: → Clean and minimal — sage green with no livery at all. Let the widebody and the color do the talking. → Heritage motorsport — subtle striping or number panel referencing classic BMW touring car liveries. → Full sponsor integration — designed around partner logos and member names on the livery vinyl. → Something nobody's done — open to concepts we haven't thought of yet. The livery is also where Founding Members and future Boost members get their name on the truck. The design has to accommodate that without looking cluttered. Which direction speaks to you? Or drop a reference image of a livery you think we should be studying.
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Post 3: 6HP Transmission — What You Need to Know
Transmission Talk — 6HP Platform The E53 X5 4.8is came with the ZF 6HP26. The broader 6HP family (6HP19, 6HP21, 6HP26, 6HP28, 6HP32) is one of the most proven automatic platforms in the BMW lineup. But "proven" doesn't mean "indestructible." What matters on the 6HP if you're building power: The mechatronic unit is the brain. When these fail it's usually the valve body sleeve seals, not the electronics themselves. A mechatronic seal kit is a fraction of the cost of a new unit and fixes 80% of shift quality complaints. Fluid matters more than most people think. The 6HP is a "lifetime fill" according to BMW, which is marketing speak for "it'll last past the warranty period." In reality: change the fluid and filter every 50-60K miles. Use genuine ZF fluid. The transmission will outlast the car if the fluid is maintained. Torque capacity. The 6HP26 handles roughly 400 lb-ft reliably in stock form. Beyond that you're looking at a rebuild with upgraded clutch packs and a custom torque converter. That's the Stage 1 plan for the E53 build. Anyone running a built 6HP or considering one? What power level and what did you do to it?
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Wide Open Throttle. Overdrive Originals takes you inside real performance builds. Engineering data, fabrication, AI design. Free to join. IYKYK.
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