Wiki
What we had to look up
Pinouts, ECU wiring, cooling and braking notes — written down while building the cars, because we needed them and could not find them. Every page says where it came from, and every page can be wrong: if you find one that is, it lives in a file you can send a correction for.
The wiki, and the reference on every part page.
Calculators
7 of the pages below carry one — compression, power, boost, fuelling, gearing. All free, all in the browser.
By subject
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ECU 1
Standalone engine management: what the inputs and outputs actually are, how to wire them, and what the settings mean.
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Plumbing 1
Hoses, fittings, fuel and oil lines, and the sizes and thread forms that have to match before any of it seals.
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Engine 7
Sensors, ignition, fuelling and the mechanical side of making one run.
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Honda 1
Engine and gearbox specifications for the B, D, H/F and K series — the part-by-part numbers the calculators are preloaded with.
By car
Everything, newest first
Density altitude and dyno correction
How much air there is today, why a hot damp day at sea level is worth thousands of feet of altitude, and what the difference is between an SAE number and a DIN one.
EngineAN fitting sizes
Dash sizes, tube diameters and thread sizes for 37° AN/JIC fittings, with what each size is normally used for on a car.
PlumbingLambda, AFR, and what the gauge says
Three ways of writing one mixture, and why a car on E85 at a perfectly good lambda reads 12.1 on a wideband — both numbers correct, only one an air/fuel ratio.
EngineSizing a turbo from the compressor map
Work out the mass flow and pressure ratio your engine will actually run at — the two axes of every compressor map — then take that point to the maps of the turbos you are choosing between.
EngineHonda engine specs and gear ratios
Bore, stroke, deck height, chamber volume, piston dish and rod length for 99 Honda parts, plus 33 gearbox ratio sets — the data the compression and gearing calculators are preloaded with.
HondaEstimating horsepower from airflow
An engine makes power in proportion to the air it can pump. Working from that gives an estimate you can argue with — unlike a multiplier for 'large turbo'.
EngineCompression ratio, and how to work it out
Static and effective compression from bore, stroke, chamber, dish, deck and gasket — with the formulas written out, and a calculator that applies them.
EngineSizing fuel injectors
What size injectors a target power needs, what they really flow at your fuel pressure, and why the same set that was fine on petrol is marginal on E85.
EngineGearing: road speed, rev drop and tyre size
How gear ratios, final drive and tyre diameter set road speed, and how to read the rev drop between gears — the number that decides whether a gearbox suits an engine.
EngineMaxxECU Race connector pinout
Both connectors on a MaxxECU Race, pin by pin, with the terminal counts and cable covers you need to order alongside them.
ECU