https://tuner-bench.com/learn.html Source-backed automotive engineering guides, worked examples, and practical build tools. en-us Mon, 17 Aug 2026 12:00:00 GMT https://tuner-bench.com/tire-size-math-vs-measured-diameter.html https://tuner-bench.com/tire-size-math-vs-measured-diameter.html Mon, 17 Aug 2026 12:00:00 GMT Learn what a sidewall tire size can calculate, why the mounted tire may measure differently, and which number belongs in each fitment decision. https://tuner-bench.com/225-45r17-vs-245-40r18.html https://tuner-bench.com/225-45r17-vs-245-40r18.html Tue, 11 Aug 2026 12:00:00 GMT A worked comparison of 225/45R17 and 245/40R18 tire sizes, including diameter, sidewall, circumference, speedometer error, and the checks the numbers cannot answer. https://tuner-bench.com/awd-tire-circumference-mismatch.html https://tuner-bench.com/awd-tire-circumference-mismatch.html Tue, 11 Aug 2026 12:00:00 GMT Calculate front-to-rear tire circumference mismatch and understand why the vehicle manufacturer—not a universal internet percentage—sets the final limit. https://tuner-bench.com/how-much-e85-to-make-e30.html https://tuner-bench.com/how-much-e85-to-make-e30.html Tue, 11 Aug 2026 12:00:00 GMT Calculate an E30 fuel blend from the fuel already in the tank, the actual ethanol content of pump E85, and the target tank volume. https://tuner-bench.com/how-to-calculate-gas-mileage.html https://tuner-bench.com/how-to-calculate-gas-mileage.html Tue, 11 Aug 2026 12:00:00 GMT The full-tank method for MPG and L/100km, including partial fills and weighted averages. https://tuner-bench.com/how-to-read-turbo-datalog.html https://tuner-bench.com/how-to-read-turbo-datalog.html Tue, 11 Aug 2026 12:00:00 GMT A practical workflow for comparing boost, timing, lambda, fuel pressure, trims, throttle, RPM, and temperature in a turbocharged-engine datalog. https://tuner-bench.com/injector-sizing-for-e85.html https://tuner-bench.com/injector-sizing-for-e85.html Tue, 11 Aug 2026 12:00:00 GMT Size port injectors from horsepower, BSFC, injector count, and duty cycle, then understand why pressure and ethanol content still matter. https://tuner-bench.com/sae-vs-std-dyno-correction.html https://tuner-bench.com/sae-vs-std-dyno-correction.html Tue, 11 Aug 2026 12:00:00 GMT Understand SAE, STD, and uncorrected dyno numbers, how weather normalization works, and how to make a defensible before-and-after comparison. https://tuner-bench.com/turbo-pressure-ratio-at-altitude.html https://tuner-bench.com/turbo-pressure-ratio-at-altitude.html Tue, 11 Aug 2026 12:00:00 GMT Calculate compressor pressure ratio from gauge boost and atmospheric pressure, then see why the same boost target is harder at altitude. https://tuner-bench.com/vin-decoder-vs-build-sheet.html https://tuner-bench.com/vin-decoder-vs-build-sheet.html Tue, 11 Aug 2026 12:00:00 GMT Understand what NHTSA VIN data can identify, what requires a manufacturer build sheet, and why recalls and enthusiast codes are separate layers. https://tuner-bench.com/wheel-offset-poke-and-clearance-guide.html https://tuner-bench.com/wheel-offset-poke-and-clearance-guide.html Tue, 11 Aug 2026 12:00:00 GMT Understand positive wheel offset and calculate how a width and offset change moves a wheel toward the fender and suspension. https://tuner-bench.com/why-horsepower-and-torque-cross-at-5252.html https://tuner-bench.com/why-horsepower-and-torque-cross-at-5252.html Tue, 11 Aug 2026 12:00:00 GMT Derive the familiar horsepower equation from torque, rotational speed, and the horsepower unit instead of treating 5,252 as engine magic. https://tuner-bench.com/bmw-chassis-codes.html https://tuner-bench.com/bmw-chassis-codes.html Thu, 11 Jun 2026 12:00:00 GMT Complete guide to BMW chassis codes: what E30, E46, F80, and G80 mean, organized by series and generation, with every M car's code and engine. https://tuner-bench.com/bmw-engine-codes.html https://tuner-bench.com/bmw-engine-codes.html Thu, 11 Jun 2026 12:00:00 GMT BMW engine codes decoded: what they came in, stock output, and honest tuning and reliability notes. https://tuner-bench.com/porsche-generations.html https://tuner-bench.com/porsche-generations.html Thu, 11 Jun 2026 12:00:00 GMT Every modern Porsche generation explained: 911, Boxster, and Cayman with years, engines, and what to know before buying.