500 EFI Tuned & Bored Throttle Body 1000CFM
Hardin Marine has taken your factory Mercury Racing EFI throttle body and combined their precision machining and tuning experience into a power producing option for all Mercury 500/525 EFI applications. High flow throttle bodies wake these engines up.
These “Monoblade” flow 1000 CFM to match Mercury’s 525HP EFI engine. The “Monoblade” has self lubricating bronze bushings for the shaft to rotate on, knife edged stainless steel throttle blade, Stock OEM sensors and throttle cable mounts in the original location. 25 HP gain is available with recalibration of the ecu and the throttle valve. Port matching to the plenum chamber and the center divider is required to be removed from the inlet of manifold allowing room for the throttle body blade to move freely.
Now that the units match the 525 efi size. This takes a 525 gasket where it mates to the manifold not the original o-ring that the 500s had. One bolt hole needs to be clearance d slightly once the gasket is laid on the throttle body. The front is machined and drilled/tapped 5/16 fine thread and now accepts the 525 flame arrestor.
Optional High Flow flame arrestor is suggested #625-5250
Mercury Racing 700 Intercooler Hi-Flow Fitting Kit
This fitting kit replaces the stock fittings with larger higher flow fittings allowing better cooling performance.
"SE" Special Edition Tuning Kit For MerCruiser 454 & 502 Magnum MPI Engines
This kit is an excellent choice for those just beginning performance
modifications on a MerCruiser Magnum EFI Series engine. This kit includes
the "SE" Special Edition flame arrestor that utilizes a high flow
K&N clamp-on style filter element and high velocity air inlet adapter which
increases air flow by as much as 20%. The included Flow Command adjustable
fuel pressure regulator allows you to tune to the proper air flow by allowing
adjustments from 25 to 65 PSI.
"SS" Sport Series Tuning Kit For MerCruiser 454 & 502 Magnum MPI Engines
Do you want quicker acceleration, faster planing, and increased performance of up to 15 HP? If so, the "SS" Super Sport tuning kit for your MerCruiser Magnum MPI engine is what you need. This kit includes the "SS" Sport Series flame arrestor that utilizes a clamp-on styleK&N element with our high velocity style air inlet. This kit include re-programming of your factory ECU in which we will modify both the fuel and spark curves as well as increasing your rev limiter and injector timing to 5400 RPM. This kit also comes with an adjustable billet Flow Command fuel pressure regulator that allows you to tune your air fuel mixture for optimum performance.
NOTE: You will need to send us your ECU with this questionnaire for re-calibration.