JDSPorsche

The JDSPorsche SharkTuners for the Porsche 928 (MY 1987 onwards) allows the optimisation of the fuel and ignition maps to ensure optimum performance from the engine. This is particularly important if the engine has been modified in any way e.g. change of exhaust system, supercharger.

The SharkTuner is a hardware interface between the LH ECU (fuel injection computer) or the EZK ECU (igntion computer) and a laptop computer. A custom Windows interface program runs on the laptop, and a slave microcontroller in the SharkTuner acts as the interface between the laptop and the LH ECU.The SharkTuner is powered by the diagnostic connector fitted to all 928s.

There are two SharkTuners in the family, the Mk 1 and the Mk 2. The Mk2 is the cost effective tool for tuning fuel and igntion for all Porsche 928s from MY87 onwards. The Mk 2 is supplied with the Programmable EPROM Modules (PEMS) described elsewhere on this website. They allow "flash" tuning of fuel and igntion by simply plugging a laptop into the existing diagnostic port of the 928. Both LH and EZK ECU parameters are available instantly by switching viewing screens. Data logging of both ECUs simultaneously is possible. Any changes are written instantly and securely to the PEM, and are retained until further changes are made.

The Mk 1 SharkTuner can also operate with PEMs for cars from MY87 onwards. It is now only available with the LH2.2/EZ-F update option which allows full fuel remapping for the 85/86 LH2.2 equipped early US/Euro 32v (engine types M28/43 & 44 and M28/45 & 46), and also the Euro 16v LH2.2 MY85-86 (engine type M28/21 & 22). Please note that the early MY 84 Euro 16v is not supported at present. Some features available with the LH2.3 SharkTuner are not available with the LH2.2 version, as indicated below. This update also adds a set of auxillary inputs which can be used for real time monitoring and datalogging of external sensor inputs e.g boost sensors. The WBO2 input law can also be edited for use with more variants of WBO2 systems. Please refer to the LH2.2 User Manual, available from the link on the left of this screen. For tuning these early cars the connection to the ECU being tuned is via a ribbon cable to the EPROM socket of the ECU. When tuning is complete, an EPROM is blown using a low cost EPROM programmerto replace the original one.

For more detailed information than that provided below, please refer to the User Manuals for the MK 2 and Mk 1 which are available for download from the links opposite. Some new options have been added to the SharkTuner Mk 2 since these screenshots were made.

Functions &Features LH ECU

• Fuel map editor with operating point indicator
• Auto tune feature for fuel map - "tune when you drive" to a target air/fuel ratio
• Supports 19, 24, 30, 36, 42 lb/hr or any custom size injectors up to 64# (not 42# with LH2.2)
• Adjustable rev. limiter
• Adjustable flappy valve control *
• Data logging with graphical output
• Status screen with real-time display of engine operating variables
• Adjustable idle speed S4/GTS 675rpm or GT 775rpm *
• Closed loop or open loop mapping
• Selectable code plug settings *
• Separate maps for closed loop or open loop running *
• Special maps for the SuperMAF for very high power applications (now also available for LH2.2 )

* not LH2.2 ECUs

In addition to changes to the fuel maps, the SharkTuner also allows manipulation of other parameters such as high rpm fuel cut off point ("rev. limiter"), the operation of the inlet resonance valve ("flappy") and fuel cut off under deceleration.

 

The SharkTuner also provides a data logging facility of many useful parameters. The data logger can run continually, or be triggered at rpm greater than 2000, or when the wide open throttle switch is closed (approx. 2/3 throttle open).

 

Data captured during a run can be viewed in tabular form in the data logger window or displayed in the graphics processor included on screen.

Alternatively, the data table can be copied and pasted into an Excel spreadsheet using the "Copy all run data" tab, where it can be viewed in tabular or processed using the Chart Wizard into graphical form. Data from several data runs can be displayed on the same graph.

The "System monitor" screen gives useful real time data on the running conditions of the engine under test and modification:

Manipulation of fuel maps is possible on a cell by cell basis, or by capturing a group of cells and incrementing them on a user selected percentage basis, or by a known fixed percentage.

Rapid initial remapping can be carried out with the "Autotune" feature on the applicable fuel maps. Idle, and cruise and WOT CO levels can be auto adjusted to a target value.

Wideband Oxygen Sensor

The SharkTuner is designed for use with a wideband oxygen sensor and associated electronic hardware. A wideband O2 system is essential for any fuel remapping. The standard O2 sensor with add on lambda indicators are NOT suitable as their operating range is too narrow.

The Techedge range of WBO2 systems are highly recommended

Alternatively an Innovate Motorsport LC1 or Innovate Motorsport LM2 the can be used.

Functions & Features EZK

• Full set of igntion maps with operating point marker
• System monitor screen with Hall and knock sensor fault indicators
• Full real time monitoring of igntion knocks
• Real time monitoring of per cylinder igntion retard applied by knock protect system
• Comprehensive data logger with graphical output option
• Detonation igntion retard step size and max value of retard editable

 

Cruise ignition map

 

 

System Monitor screen

Parameters screen

SharkTuner Requirements

• A wideband oxygen sensor and associated electronics (see previous paragraph)
• A laptop computer running Windows 98SE/2000/XP/Vista/Win 7, with a USB port for the Mk 2 SharkTuner. The Mk 1 has a standard 9 pin serial port. If a serial port is not available, a USB to serial adapter can be used.
• For the LH2.2 and EZ-F option you require 2732A EPROMS. These are available from vendors such as Futurlec. Also a low cost USB EPROM reader/writer such as click here. Alternatively, you may find a local electronics shop that will blow EPROMs for you to your modified files
• A good general knowledge of the principles of engine management systems.
• Be "computer literate"

Availability & Pricing

The MK 1 Sharktuner with LH2.2 and EZ-F option are available $1990 or equivalent in Euro or GBP.

PEMs for use with S4 and later 928s available at $100 USD each.

The cost of an upgrade of a standard MAF to "SuperMAF" specification for very high power engines is $100USD

VAT will be due on European sales.