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Articles for: Honda Civic Si

Should You Skip Stage 1 on Civic Si? The Data Says No

Honda Civic Si owners debating Stage 1 vs jumping straight to Stage 2 with intercooler upgrades need to see the data first. Progressive tuning delivers more power per dollar than the shortcut approach.
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What AFR Should You Run on E85? Honda K20 Data Shows Why 10.5 Kills

Running 10.5 AFR on E85 doesn't make your K20 safer than 11.5, it's killing it differently. Cylinder wash and oil dilution from over-fueling destroys engines just as dead as lean conditions, just slower.
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Why Your Intercooler Loses 40hp After Three Pulls (GTI/Si Data)

Your intercooler hit 380hp on the first dyno pull, but dropped to 340hp by the third. Heat soak isn't just losing power, it's killing consistency when you actually need it.
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Why 11.8 AFR on E85 Melts Honda Civic Si Pistons

That 11.8 AFR reading looks safe, but it's actually the most dangerous zone for E85 Civic Si builds. The uneven burn patterns in this range create hotspots that melt pistons faster than lean conditions.
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Honda Civic Si Boost Creep After Intercooler Upgrade: Fix Guide

That new front-mount intercooler might be sabotaging your boost control. Better cooling creates denser air, more backpressure, and boost creep past your wastegate spring pressure.
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