Blog
How to Wire a Secondary Fuel Pump: Relay, Trigger, and Controller Setup for Dual-Pump BMW Builds
The second Walbro 450 in our dual pump LPFP kits pulls about 19 amps at 80 psi, so our activation harness gives it its own fused relay circuit. Our support guide to...
Wideband AFR Gauges: How to Know Your Tune Is Not Running Lean
Most tuned N55, B58, S55 and S58 BMWs already log lambda from their factory wideband sensors through MHD or bootmod3. Here is how lambda and AFR differ on E85, what full throttle...
B58 Cooling Upgrades: How to Stop Heat Soak
Why the B58 heat soaks and what each cooling part actually fixes: heat exchangers, auxiliary radiators, oil and transmission coolers and charge cooler manifolds, with owner logs, fitment and prices for the...
B58 Stage 1 vs Stage 2: Which Do You Need?
B58 stage 1 vs stage 2: what each map assumes, bootmod3 and MHD gains, the Gen 1 vs B58TU fuel limit, real parts costs, and what Supra and 540i owners report.
BMW Low Fuel Pressure Codes Explained: 29F2, 29DC, and When Your LPFP Is Dying
What BMW codes 29F2, 29DC, 2FBF and 2AAF mean, the 5 bar low side log that tells a dying LPFP from an HPFP on the N54, N55 and B58, and which pump...
Best Oil for a Tuned BMW: What to Run and How Often to Change It
Which BMW Longlife approval a tuned N54, N55, B58, S55 or S58 needs, when an LL-01 5W-40 makes sense, how Red Line, Liqui Moly, Motul and Mobil 1 compare, and why owners...
Downpipe vs Cat-Back: Which Should You Buy First?
Downpipe or cat-back first on a turbo BMW, Audi, VW or Supra? A $199.99 B58 downpipe with a tune adds 30 to 40 hp; a cat-back is about sound. Here is the...
B58 Stage 3 LPFP: 1000 WHP From a Single Pump
Our F chassis B58 Stage 3 brushless LPFP runs one pump on the factory control and is rated for 850+ whp on E85. What it fixes, what it cannot (the Gen 1...
BMW Carbon Buildup: Why Every DI Engine Gets It and How to Fight Back
Every direct injection BMW cokes its own intake valves with oil vapor. Here are the symptoms in order, what walnut blasting costs owners, and what catch cans and cleaners can and cannot...
The B58 Bolt-On Build: What to Add and in What Order
The B58 bolt-on build order for the M240i, M340i, 440i, Z4 and Supra: plugs and Stage 1, a charge pipe on Gen 1 cars, catless downpipe and Stage 2, heat exchanger, then...
BMW Charge Pipe: Why the Plastic One Fails
The factory plastic charge pipe cracks on N54 and N55 BMWs, even untuned ones, and splits on the S55. Which engines need an aluminum pipe, which can skip it, the warning signs,...