this, the nitrous tune-up on a mass-air meter equipped engine is set-up to flow more fuel than an equivalent tune-
up for a non mass-air meter equipped engine.
Jet chart for engines NOT using a mass-air meter (i.e. speed-density):
50hp 75hp 100hp 125hp 150hp 175hp 200hp
Nitrous (950psi)
Nozzle Jet 26 26 26 54 54 54 54
Distribution Block Jet 32 43 57 56 67 76 105
Fuel (40psi)
Nozzle Jet 19 19 19 19 19 19 19
Distribution Block Jet 19 21 24 28 33 38 46
Ignition Retard (deg.) 2 4 6 8 10 12 14
Jet chart for engines using a mass-air meter:
50hp 75hp 100hp 125hp 150hp 175hp 200hp
Nitrous (950psi)
Nozzle Jet 26 26 26 54 54 54 54
Distribution Block Jet 32 43 57 56 67 76 105
Fuel (40psi)
Nozzle Jet 19 19 19 19 19 21 21
Distribution Block Jet 21 26 33 43 57 57 76
Ignition Retard (deg.) 2 4 6 8 10 12 14
Normally aspirated tuning requirements:
For engines less than 10.75-1 compression ratio, using nitrous system settings of 100hp or less, pump premium
fuel is required for safe operation of your ZEX Direct Port Nitrous System. For engines with 10.75-1
compression ratio or greater, using nitrous system settings higher than 100hp, high octane racing fuel is required
for safe operation of your ZEX Direct Port Nitrous System. Nitrous system fuel pressure must be at least 40psi
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