Octane Boost Requirements
WARNING: your actual octane is 3.5 points less than marked at the gas pump.
Ounces of Quality Octane Boost* | Supercharged Engine Size 4.6 / 5.4 / 5.8 |
Max RWHP per C.I. | Octane Target | Actual Octane | Pump Rating | E85% added | Increases Octane to | Gallons of gas per 1 gallon of E85 | Air Fuel Lean | Inj. Size Added | Plug Heat / Gap | Total Spark | |
RWHP | 410 / 510 / 540 | 1.5 | 86 | 86 | 89 | TR6 37 | 17 | ||||||
RWHP | 440 / 540 / 570 | 1.6 | 88 | 88 | 91 | TR6 36 | 20 | ||||||
RWHP | 475 / 570 / 600 | 1.7 | 90 | 90 | 93 | TR6 35 | 23 | ||||||
16 | RWHP | 500 / 600 /630 | 1.8 | 91 | 90 | 93 | 10% | 91 | 9 + 1 = 10% | 4 | 4# | TR8 32 | 23 |
16 | RWHP | 535 / 630 / 667 | 1.9 | 92 | 90 | 93 | 17% | 92 | 5 + 1 = 17% | 10 | 10# | TR8 31 | 23 |
16 | RWHP | 562 / 662 / 702 | 2 | 93 | 90 | 93 | 20% | 93 | 4 + 1 = 20% | 12 | 12# | TR8 30 | 24 |
32 | RWHP | 590 / 695 / 737 | 2.1 | 94 | 90 | 93 | 25% | 94 | 3 + 1 = 25% | 15 | 15# | TR8 29 | 24 |
32 | RWHP | 618 / 728 / 772 | 2.2 | 96 | 90 | 93 | 35% | 96 | 2 + 1 = 35% | 18 | 18# | TR8 28 | 25 |
32 | RWHP | 646 / 761 / 807 | 2.3 | 98 | 90 | 93 | 50% | 98 | 1 + 1 = 50% | 22 | 22# | TR8 27 | 26 |
64 | RWHP | 675 / 795 / 842 | 2.4 | 106 | 90 | 93 | 100% | 106 | 0 + 1 = 100% | 27 | 27# | TR8 26 | 27 |
64 | RWHP | 702 / 825 / 885 | 2.5 | 106 | TR8 25 | 23 | |||||||
64 | RWHP | 730 / 858 / 920 | 2.6 | 106 | TR8 24 | 23 |
* Ounces of octane boost should be added to every 1/2 tank of gas.
Example calculation to formulate a percentage of E85 you wish to run
25% of E85 = Gas Pumped x .25 6.5 gal. gas x.25 = 1.625 gal. of E85 added or 25%
50% of E85 = Gas Pumped x .5 6.5 gal. gas x.5 gal of E85 added or 50%
25% of E85 = Gas Pumped x .25 6.5 gal. gas x.25 = 1.625 gal. of E85 added or 25%
50% of E85 = Gas Pumped x .5 6.5 gal. gas x.5 gal of E85 added or 50%
Important: Leave room in tank for E85 added
Run air fuel gauge in car, look for part throttle at 14-14.5 and WOT at 11.5-12
Increasing fuel pressure 10+ # will help in tuning an E85 mix
When running E85 50 to 100% add larger fuel rails and a stainless fuel filter or filter delete tube
Example Calculation for RWHP for C.I.
590 RWHP/by 281 C.I. = 2.1 C.I. per RWHP
Graph shows a need of 94 octane to safely run this engine at speed
590 RWHP/by 281 C.I. = 2.1 C.I. per RWHP
Graph shows a need of 94 octane to safely run this engine at speed