Engine Management System

Installation Documentation

With Individual Throttle Bodies

Andrew Darud

Rev 2.0 – 02/06/2018

Overview:

1. Introduction .......................................................................................................................................... 3

2. Disclaimer .............................................................................................................................................. 3

3. Component List ..................................................................................................................................... 4

4. Required Tools and Supplies ................................................................................................................. 8

5. Installation ............................................................................................................................................ 9

Preparation ................................................................................................................................... 9

Harness Installation..................................................................................................................... 10

Ignition System Install ................................................................................................................. 15

Fuel System Install ...................................................................................................................... 16

6. Initial Power-up of the ECU ................................................................................................................. 19

Installation of AEM Infinity Tuner Software ............................................................................... 19

Setting ignition timing ................................................................................................................. 21

Final Steps ................................................................................................................................... 24

7. Tuning Basics ....................................................................................................................................... 27

Volumetric Efficiency – Fuel Delivery.......................................................................................... 27

Ignition Tuning ............................................................................................................................ 29

Infinity ECU Hot Keys: ................................................................................................................. 30

Creating a Log File in Infinity Tuner: ........................................................................................... 31

Viewing a Session (Log) File in Infinity Tuner: ............................................................................. 31

1. Introduction

Rasant Products would like to thank you for your order of our Engine Management Kit! We

are honored to be a part of your Porsche 911 build and would like to congratulate you as you

take steps towards modernizing and enhancing your 911.

Our goal at Rasant Products is to provide a quality product to fellow members of the

Porsche community as they seek to improve the performance, drivability, and enjoyment of

their vehicles. It is our sincerest hope that you find this customized kit exceeds your

expectations as you tune and drive your 911. We are fully committed to offering support both

during and after installation, so please feel free to reach out with any questions, comments, or

feedback you may have.

We look forward to working together as you get one step closer to perfecting your 911.

Best Regards,

Andrew Darud Rasant Products LLC

2. Disclaimer

Any Engine Management System used improperly can result in serious engine damage.

Rasant Products LLC is not liable for any personal or property damage while installing or using

our products. You continue at your own risk. We always recommend a qualified tuner to dial in

your new engine management system. Please follow all local regulations regarding vehicles that

have aftermarket parts installed.

3. Component List Item Quantity Description

AEM Infinity 8H

1 The heart of the kit, the Engine Control

Unit (ECU).

Distributor Adapter Kit for EFI

1 Rasant Products Cam/Crank Housing. This transmits both

Cam and Crank signals to your ECU.

Ignition Coils

6 Bosch coil-on-plug (COP) ignition coils

Spark Plugs

6 Bosch spark plugs with 5/8” hex (mandatory with the COP ignition)

Fuel Injectors

6 Bosch OEM Fuel Injectors

Engine Harness

1 Complete engine wire harness (terminals/connectors are populated)

Bussmann Fuse/Relay Center

1 Bussmann Fuse/Relay Center (complete with fuses/relays)

ECU/Fuse Center Bracket

1 ECU/Fuse Center Bracket (anodized aluminum bracket to mount the ECU and fuse/relay center)

MAP Sensor

1 GM 1 Bar Manifold Air Pressure sensor

IAT Sensor

1 GM Intake Air Temp sensor (fastening nut included as well)

Fuel Pressure Sensor

1 100 PSI Stainless Steel Fuel Pressure sensor

AEM Wideband O2 Sensor

1 Bosch LSU 4.2 Wideband O2 sensor

Wideband O2 Weld-in Bung

1 Weld-in O2 sensor bung (for your exhaust header)

Fuel Line and Hose End Kit

1 Fuel Line and Hose Kit (includes all the fuel line and hose ends needed to plumb between the fuel accumulator and the fuel pressure regulator)

Fuel Pressure Regulator

1 Adjustable Fuel Pressure Regulator

18-22 Ga Wire Butt Connectors

2 Wire butt connectors (for connecting ignition and tach signals)

14-16 Ga Wire Butt Connector

1 Wire butt connector (for connecting to factory fuel pump wires)

M3 Screw/Nut Set

4 M3 Fasteners (for the wire harness seal to vehicle body)

4. Required Tools and Supplies • 10mm open end wrench

• 13mm open end wrench

• 17mm open end wrench

• 5/16” open end wrench

• 11/16” open end wrench

• 3/4” open end wrench

• 7/8” open end wrench

• 3/8” Drive socket wrench

• 10mm socket

• 13mm socket

• 13/16” Spark plug socket

• 5/8” Spark plug socket

• 1/4” Drive socket wrench

• 7/32” Socket

• 5mm Allen key

• 3/16” Allen Key

• Phillips head screw driver

• Multi-Purpose Wiring Tool

(http://www.homedepot.com/p/Commercial-Electric-8-in-Multi-Purpose-Wiring-Tool-

06008/202039373)

• Ignition advance timing light

• Spark plug extension wire

• Zip ties

• Side cutters

• Silicone Lubricant

• Drill (optional, depending on vehicle configuration)

• 2 3/8” Hole Saw (optional, depending on vehicle configuration)

• Dremel (with cut off wheel attachment) for fuel lines

• Feeler gauge

5. Installation We recommend using the following procedure to install your Rasant Engine Management kit. Please

keep in mind that Porsche made several small variations to vehicle bodies and engines over the years.

Should you find something is not compatible with your vehicle, or you discover a more efficient process,

please let us know so we can modify your instructions accordingly.

Preparation

• Install your ITB’s according to the manufacturer’s instructions. Please use the fuel injectors

provided with the Rasant Kit in your ITB assembly and be sure to use a small amount of oil on

the O-rings to prevent damage during install.

• Install a weld-in bung and wideband O2 sensor (included with the Rasant Kit) into your exhaust

system, if one does not already exist. Your harness is wired to reach either the driver or

passenger side exhaust headers. Please be sure to install at an adequate angle, as having the

sensor too vertical can cause overheating issues. A horizontal install will allow condensation to

drip on the sensor.

• Remove the 12V battery ground strap from the battery.

• Jack up the rear of your vehicle with enough room to lay underneath the engine/transmission.

Always be sure to place the vehicle on jack stands with blocks at the front wheels while working

under your car.

Photo via wbo2.com

Wideband O2

sensor and

Bung Installed

Harness Installation

• Pull up the carpet on the vertical wall behind the passenger seat (where the rear passenger side

feet would be). On later year cars there is a factory hole in this location. For early year cars, you

must drill a hole for the harness to pass though. Use a 2 3/8” diameter hole saw to allow room

for the harness components to pass through. The provided seal will be used to cover this hole

and prevent rust. If you do need to cut a hole, it is always recommended to brush/spray some

paint on the newly exposed metal.

• Feed the wiring harness through this hole behind the passenger seat. It is helpful to have a

person on the other side to receive the wires being fed through. It works best to follow these

steps:

o Feed one bank of connectors through (cylinders 1-3)

o Feed the second bank of connectors through (cylinders 4-6)

o Feed the sensor connectors, ground and battery cable through

• Use a 1/8” drill to add holes for the harness seal fasteners. The harness seal is shown below:

• Secure the harness seal to the vehicle using the M3 fasteners supplied with the kit.

• Fasten the ECU Bracket to the factory luggage strap (where available) holes using supplied M6

bolts and washers. If the factory luggage strap is not installed on your vehicle, install fasteners

as necessary.

• The fuse/relay center (pictured below) is located on the ECU bracket and has two possible

configurations:

Single Plug Ignition

Twin Plug Ignition

Relays: 1: ECU Main Power 2: Fuel Pump 3: Ignition Coils 4: Fuel Injectors

Relays: 1: ECU Main Power 2: Fuel Pump 3: Upper Ignition Coils 4: Lower Ignition Coils (not shown) 5: Fuel Injectors

Fuses: 1: ECU Main Power (15A) 2: Fuel Pump (10A) 3: Ignition Coils (15A) 4: Fuel Injectors (20A) 5: ECU Full Time Power (10A)

Fuses: 1: ECU Main Power (15A) 2: Fuel Pump (10A) 3: Upper Ignition Coils (15A) 4: Lower Ignition Coils (15A) (not shown) 5: Fuel Injectors (20A) 6: ECU Full Time Power (10A)

• Begin passing the connectors through the hole in the passenger side of your engine

compartment. Again, having a helper on the other side to feed the wires through helps the

process. The photo below is looking in through your engine compartment. Feed the connectors

into the engine compartment in the same way you fed the harness through the location behind

passenger seat. Note: The battery cable, fuel pump wires, and O2 sensor wires should not go

into the engine compartment.

• Route the harness inside the engine compartment based on the diagrams below. Some items

that aren’t clearly visible in the photos include:

o The two ground terminals near the ignition coils. They need to be mounted on the M6

bolts which fasten the fan shroud to the engine.

o TEMP (ring terminal) should also be mounted to an M6 bolt on the fan shroud. The ring

terminal has an integrated thermistor which tells the ECU engine temp. Therefore, it’s

important that this ring terminal is on a fastener that heats up with the engine. We

suggest one of the fasteners that hold the fan shroud to the cam tower near either

cylinder 2 or 3.

o TACH (Tachometer signal, Grey wire) will tap into the factory harness on the driver’s

side with included butt splices. (Note: These have heat shrink tubing, so be sure to

shrink them down with a heat gun after installation.)

▪ It is a black wire with a purple stripe on the 1975 911, but varies between model

years. Please verify the correct wire for your vehicle.

o IGN ON (Ignition Key-On, Red wire) will tap into the factory harness on the driver’s side

by using the butt splices included in your kit. (Note: These have heat shrink tubing, so be

sure to shrink them down with a heat gun after installation.)

▪ It is a red wire on the 1975 911, but varies between model years. Please verify

the correct wire for your vehicle

A few notes for ITB installs:

o IAT to be mounted in the ITB air filter housing, or somewhere near the intake air stream

for common plenum setups.

Fuse/ Relay

Box

Starter

Fuel

Pump

02 Sensor ECU

GND

IGN 4

IGN 5

Cam/

Crank

CNT TEMP

FUEL 4

FUEL 5

FUEL 6

IAT

MAP

TPS Fuel

Pressure

FUEL 1

FUEL 2

FUEL 3

IGN 1

IGN 2

IGN 3

GND

IGN 6

GND

TACH (Grey)

IGN ON (Red)

• Finish installing the harness components under the car:

o Connect the fuel pump wires to the factory fuel pump connector pigtail with butt splices

included in your kit. (Note: These have heat shrink tubing, so be sure to shrink them

down with a heat gun or lighter after install)

o Wideband O2 Sensor

o Ground ring terminals should be mounted on M8 stud along with the transmission

ground strap (near the front of the transmission).

o Battery cable should be mounted to the positive terminal of the starter motor. Make

sure to double check that your battery is disconnected first.

• Go through all areas where the harness was installed and secure the harness with zip ties or p-

clamps as needed.

Ignition System Install

• Using a 13/16” deep well spark plug socket, remove the factory style spark plugs from your

engine.

• With a 5/8” deep well spark plug socket, install the supplied spark plugs into all six cylinders.

• Insert the ignition coils into the spark plug hole and install the connector. The connectors will

“click” when fully seated.

• Install the Rasant Products Cam/Crank Housing into the distributor hole in your engine and

secure the nut. There is no required orientation. A later step will provide an offset to the ECU.

o Note: The new distributor seal may be stubborn to install. Always use silicone lubricant

and verify that the distributor is fully seated before fastening the securing nut. Do not

use this nut to fully seat the distributor as serious damage can occur!

• Connect the wire harness connectors on the cam/crank adapter to your engine harness

Fuel System Install

• The fuel pressure sensor shall be installed in the front 1/8 NPT port of the fuel pressure

regulator.

• Considering there are several options for fuel rail, fuel filter, and fuel regulator mounting

locations, the kit is provided with unassembled fuel hose and hose ends.

• The kit includes the following fuel line components:

Component Quantity

-6AN PFTE Hose w/ black liner 6 ft

90 Degree -6AN Hose End 2

Straight -6AN Hose End 4

Metric Adapter to -6AN (to factory fuel filter) 1

-6AN Union 1

-6AN To Convex Flare (to factory return line) 1

90 Degree -6AN O-Ring to Male -6AN 1

Straight -6AN O-Ring to Male -6AN 1

-6AN O-Ring Plug 1

• For the majority of applications, the following hose/fitting layout is best:

• Install the appropriate fittings on the fuel pressure regulator as shown in the image below (note

the port in the front where the fuel pressure sensor shall be installed). Be sure to tighten all

fittings, including those already installed on the fuel pressure regulator. The set screw and nut

on top will be adjusted in a later step, but simply tighten at any position for now.

1

2

3

-6AN O-Ring Plug

From fuel rails: 90 Degree -6AN O-Ring to Male -6AN

To Fuel Tank: -6AN O-ring to -6AN

Union to Metric Convex

Note: These two sides are interchangeable to help accommodate your layout

-6AN O-ring to

-6AN Union to

Metric Convex

• Find a location to mount the fuel pressure regulator. It works best to place it towards the front

driver’s side of the engine component, as it provides easy access to the factory fuel return line.

• Make the appropriate measurements for the fuel lines according to your engine compartment

layout. I recommend using a Dremel tool with a cutoff wheel to cut the hose, be sure to cut

perpendicular to the hose length. The following document is a clear outline of how to properly

install the hose ends: http://documents.holley.com/199r11133.pdf

• Finally, install the fuel lines according to the diagram provided above.

6. Initial Power-up of the ECU Installation of AEM Infinity Tuner Software

• Prior to powering up your unit, download the AEM Infinity Tuner software from AEM:

http://aemelectronics.com/software-aemnet/infinity-engine-management-system-software

Note: AEM Data is an optional data viewing software. In my opinion, Infinity Tuner is all you

need for both collecting and viewing data.

• Proceed with installation using the general settings.

• Open the installed version of AEM Infinity.

o When prompted, navigate to your Infinity 8h folder and open the AllTabs_8h.itlyt layout

file (C:\Users\YourComputerName\Documents\AEM\Infinity

Tuner\Layouts\v96.1\Infinity-8h)

Click Download

• Remove the following relays from the Bussmann fuse center before powering up the unit:

• Re-connect your 12V battery ground cable.

• Key on the ignition. You should hear the relay “click” near the ECU.

• Connect your computer to the ECU Mini-USB port (cable is supplied in AEM Infinity box).

• When you are properly connected to the ECU the red “Not connected” message will change to

green.

• Verify that your engine configuration is accurately input to the ECU via the Wizards-> Setup

Wizard tab. Your configuration should match the image below, though differences may occur

depending on your engine displacement and VE tuning preference.

Remove these three relays: #2: Fuel Pump #3: Ignition Coils #4: Fuel Injectors

Setting ignition timing

An Engine Control Unit (ECU) needs to know the position of the camshaft and crankshaft in order to run

the engine properly. The Rasant Kit uses our exclusive cam/crank adapter which allows for an all-in-one

install without the need for adding separate cam/crank sensor locations. The cam/crank adapter can be

installed in any orientation and the timing offset can be easily input the ECU. The steps below outline

this process:

• Install the spark plug extension wire (not included) between the ignition coil for cylinder #1 and

the spark plug. Be sure the ignition coil is still connected to the main engine harness.

Alternatively, the higher end timing lights can pickup the spark energy from the wire harness

alone. This saves the trouble of using an extension wire as the timing light clamp goes directly

over our wiring harness.

• Place the timing light clamp around the spark plug extension wire. Your setup should look like

this:

• Provide 12V to the timing light. There are several options depending on your vehicle

configuration: factory 12V fuse locations, extension wires from the main battery, a spare 12V

battery, or a small 12V power supply.

• Install the ignition coil relay (#3) in the Bussmann fuse center. DO NOT INSTALL FUEL PUMP OR

INJECTOR RELAYS!

• Open the Setup Wizard in the Infinity Tuner software (Wizards-> Setup Wizard).

o Click the “Ignition Sync” button on the left window

o Select “Lock ignition timing at 10 degrees BTDC”

o Verify your screen matches the one shown below:

• Open the “Diagnostics” tab (“CamCrank” in later versions) in the Infinity Tuner Window

o Set “CamSyncAdjustment” to 0 (coarse timing adjustment -> 6 Degree increments)

o Set “TrigOffset” to 0 (fine timing adjustment -> 1 Degree increments)

• Set the timing light to 10 degrees BTDC. If your timing light reads 0 degrees or 5 degrees BTDC,

then change the value on the Wizard Ignition Sync page from 10 degrees to 0 degrees or 5

degrees (to match your timing light value). This is to ensure the timing light is reflecting accurate

ignition timing.

• Using a remote start switch (Actron makes a nice one: CP7853 Remote Starter Switch), or an

assistant to turn the key, crank the engine over while holding the timing light on the crankshaft

pulley.

o Note: Try to limit the amount of cranking time to less than 5 seconds per crank, with

time for the starter to cool down between cranking. This is to prevent damage to the

starter motor.

• Watch for the light to flash when the TDC notch (labeled Z1 on the flywheel pulley) is near the

notch on the fan housing. Since it can be difficult to identify the Z1 notch after the engine starts

spinning, it is wise to make a small spot with a paint marker on the Z1 notch before you begin

the process (if one does not already exist).

o Note: If the light is not flashing near the TDC notch on the flywheel pulley, adjust the

“CamSyncAdjustment” and crank the engine again. Repeat this process until the notches

are nearing alignment. You should not need to increase this beyond a value of 60.

• With the “CamSyncAdjustment” value fixed, start adding to “TrigOffset” (in 1-5 degree

increments, depending on how close the timing is). If the timing appears to be getting further

from the TDC notch, then try adding one more to the “CamSyncAdjustment” and continue with

adjusting “TrigOffset” until the Z1 notch aligns with the fan housing notch. If “TrigOffset”

reaches higher than 6 degrees, “CamSyncAdjustment” should be incremented again.

• When the Z1 notch is aligned with the fan housing notch, then the ignition timing has been set

appropriately.

• Go back to the wizard and uncheck “Lock Ignition Timing at…”. Now the ignition timing should

follow the ignition table. The ignition table will be discussed in greater detail in section 7.2.

Note: Once the install is complete and the engine is fully warmed, go back and verify the ignition timing

with a timing light and spark plug extension. This time you can make small adjustments to the

“TrigOffset” with the engine running. Again, use the “Lock Ignition Timing” function in the ECU and

match that value with your timing light. Adjust “TrigOffset” until the timing marks align.

Final Steps

• Verify that the harness is connected to each component and properly secured throughout the

vehicle.

• Install all remaining relays into the fuse center.

• Key the vehicle on, listen for the fuel pump to prime, and look in the engine compartment to

check for fuel leaks.

• Adjust the fuel pump priming time to 30000 ms (milliseconds) in the Infinity Wizard. This will

allow you more time to adjust the fuel pressure regulator.

• Adjust the fuel pressure regulator to ~39.2 PSI by following the manufacturer’s instructions that

are provided with the regulator. The pressure is monitored via the Infinity Tuner Software on

the Injector Tab. The variable is called FuelPressure:

• Once the fuel pressure is properly set, adjust the fuel pump priming time back to the default

(2000 ms)

• Now you’re ready to start your engine! If you’re new to tuning, or not experienced with the

AEM unit, I recommend reading on to the Tuning Basics section prior to starting.

7. Tuning Basics Volumetric Efficiency – Fuel Delivery

The Volumetric Efficiency (VE) measurement is the comparison of actual air flow through the engine

compared to the theoretical maximum air flow. Modifying things like cam profiles, cylinder port shapes,

intake system, and exhaust system cause a change in the VE.

The engine controller uses VE to understand how much fuel it needs to add. If the ECU knows the

displacement of the engine and how efficiently air is moving through, it can easily calculate the amount

of fuel needed.

VE is updated by changes in one table in the controller. RPM is on the x-axis and either MAP or TPS

(depending on your tuning preference) on the y-axis. This is called the VE Table:

The best way to understand if you need to update the VE Table is to monitor the “NewVE” variable

(shown below) in the Infinity Tuner software. This variable indicates what VE value should be in the

table. If the initial VE value is significantly off, it may take a few iterations of updating values in the VE

table based on the NewVE variable.

The VE will be the first value you update while the car is idling. An easy way to update VE is to use the

logging feature in the top menu bar (Logging -> Start PC Logging). When using PC logging, the Plot

Window (shown above) will update. Clicking on the “pointer” will allow you to move to different points

in the plot window. As you move to different points in the plot window, you will notice that the other

windows on the screen also update. This is the best way to compare VE and NewVE when updating the

VE table.

Plot Window

Pointer

Ignition Tuning

Ignition tuning and VE are the other most important variables that require tuning. It is a bit more

involved for the tuner and has the most potential to damage the engine. For this reason I recommend

tuning ignition only if you are experienced with engine management systems. There are many shops out

there that will support a few dyno runs and basic tuning for a reasonable fee.

For those who are willing to accept the risk with their engine, I will provide my personal advice and

tuning method. Typically ignition tuning is done by ear or some knock-sensing device (knock ears, knock

sensor, ridged wire connected to the engine to feel vibration, etc.). While there is somewhat of a

controversial debate about the best way to tune ignition timing, I personally tune by ear. In order to dial

in the peak RPM points I also recommend using a dyno, since tuning at high RPMs on the street is not

ideal.

When tuning by ear you are listening for a “pinging” sound. This can range from a very subtle tinging to

loud banging, as though there are rocks flying through your engine. If you reach this point, you have too

much ignition advance. Updating the ignition timing table is straightforward and follows the same

structure as the VE table. The table below is found on the IgnMap tab and is used to update ignition

advance:

Infinity ECU Hot Keys:

Z + 10 : By highlighting a section of a table, entering z+10, and pressing enter, all selected numbers will

increase by 10. This can increase by any amount, I just use 10 in this example:

Z - 10 : By highlighting a section of a table, entering z-10, and pressing enter, all selected numbers will

decrease by 10. This can decrease by any amount, I just use 10 in this example:

h : Use “h” for the horizontal blending of cells. This is a great tool for updating ignition and VE

tables. You may know the value for two different cells, but not the ones in between. When

updating tables, a smooth transition between cells is important. After highlighting desired cells

with acceptable known values, press “h” to create a smooth transition between them. Example:

v : Use “v” for the vertical blending of cells. This is the same as above, but works for updating cells

vertically. Example:

Z+10

Z-10

h

v

Creating a Log File in Infinity Tuner:

• With the ECU connected and powered on, select Logging -> Start PC logging on the top menu

bar.

• When you are finished collecting data, select Logging -> Stop and save PC log on the top menu

bar. From here you have two options:

o Click “yes” to save the log file to your computer and enter in a file name when

prompted. This will allow you to go back and review the data anytime.

o Click “no” to simply view the log file, but not save it. This can be very helpful when

tuning as you don’t have to save each file, but it allows you to view and calibrate with

the recorded data.

Viewing a Session (Log) File in Infinity Tuner:

• With your layout file open, go to File -> Open Saved Session

o Locate your Session File (.itssn)

• When viewing the session file, you can use the mouse pointer on any Plot screen to scroll

through the data. You’ll notice that all tables will update as you scroll across a plot.

o See example below. The purple line on the plot screen is the point I selected, all text

grids and tables are updated to reflect the data at that point in time.