1988 – 1991 Chevy TBI V8
1992 uses the same settings, but the pinout is different.
Test Vehicle Details:
The vehicle used for drawing up these application docs was a USDM 1988 Chevy Camaro 383 TBI with an automatic 700R4 transmission. All factory electronics/ignition system components are in place and the factory wiring harness is in perfect condition.
What to buy:
What tools you’ll need:
Base Configuration .msq files to help you get your car fired up safely and quickly. Ready to tune.
|We’re including these maps prior to showing you how to jumper your DIYPNP up. There’s a reason for that. The base ignition settings contained in these maps should be loaded on your DIYPNP before you power your car up (with the key) with the DIYPNP installed. This is to prevent damage to your ignition system in case the default settings are not correct for your vehicle. Note that you can power up the DIYPNP off the vehicle on a power supply connected to the power jack next to the DB15 connector.
So here’s our recommendation– After you complete basic assembly, Power up your DIYPNP one of two ways. Either plug a Stimulator Power Supply into the front panel of the box (the easiest way), or, start the Jumper Section below, but only connect the power and ground wires to start with. That way you can plug the DIYPNP into your factory wiring harness and safely power it from your car. The third option, if you’ve fully assembled and jumpered your DIYPNP already, is to unplug your coils from their power connectors before plugging the DIYPNP into your factory harness and powering it from there.
Then and only then, you can flash the firmware on your DIYPNP to the MS2/Extra firmware if you haven’t already, and then load the startup map provided to help you get your vehicle started.
Once the vehicle is started, you will need to use the MS2/Extra manuals to set the base timing and begin to tune the vehicle! This is critical! Do not drive an untuned vehicle!
DIYPNP Jumper Configuration
This section will cover the standard, basic jumper configuration required to get the vehicle running using your DIYPNP.
|Main Board:||DIYPNP v1.5|
|Minimum Code Version||MS2/Extra 3.1.0|
Edge Pin Connections
|VR IN +|
|VR IN –|
|OPTO IN +|
|OPTO IN –||B5|
|VR2 IN +|
|FUEL PUMP||* HIGH SIDE|
High Current Drivers
|Enabled||Sensor +||Sensor –|
|Circuit||Input From||Out Pin To||Purpose|
* High Side out to A1** Fan 1 WLED
** Fan 2 ALED*** Give 5V to D5 for HEI bypass signal
**** Need to add injector resistors
|Spark Mode||Basic Trigger|
|Use Cam Signal|
|Ignition Input Capture||Falling Edge|
|Spark Output||Going High (Inverted)|
|Number of Coils||Single Coil|
|Dwell type||Standard Dwell|
|Maximum Spark Duration||0.5|
|Spark Hardware Latency||38|
|Trigger wheel teeth||60|
|Tooth #1 angle|
|Second trigger active on|
|and every rotation of|
This section will cover changes that need to be made to the DIYPNP that go beyond the standard I/O jumpering, such as intake valve butterfly activation, on/off VVT activation, or other customizations to address the specific needs of a vehicle.
The factory fuel injectors for this vehicle are low impedance, around 2 Ohms each. The injectors are wired back to the ECU in two banks on ECU pins D14 and D16. We used two 10 Ohm 25 Watt resistors, one for each injector bank. The wires would be run from INJ1 out to one side of the first resistor, and from the other side of the resistor out to connectorboard pin # D16. You would duplicate this circuit for INJ2, and finish at connectorboard pin # D14.
Stepper Idle Motor Control
The stepper idle control motor uses 4 wires.
In addition to these four output jumpers, you will want to jumper from PT6, PT7, and PB4 (up near the DB15) on the main board to the stepper circuit on the connectorboard. Jumpers for 12V, 5V, and GND will also need to be run from the main board to the connectorboard.
The transmission in this car is a fully mechanical model and needs no input from the ECU other than torque converter lockup. The owner of this particular Camaro had installed a manual torque converter lockup switch in the center console before bringing the car to us. The DIYPNP in this car had no control over the transmission.
Read the Manuals, You are Responsible for your own results!
This Application Doc is intended to assist you in your DIYPNP DIY EFI Installation. We’ve done a fair amount of research, and actually tested on a similar vehicle to help ensure we can provide the most accurate information possible to make your installation go as smoothly as possible. That said, there are certain things you could do incorrectly, or certain things you could change up, that could cause you to run into issues. Our tech support department will be glad to assist you working through any issues you might have, please contact us and give us that opportunity and we should be able to work things out for you.
Startup Maps included/attached to this Application Doc is intended only to help you get your engine started so that you can properly tune your engine. The map will be setup properly for a stock vehicle matching the year/make/model/trim in the ‘Test Vehicle Details’ section at the top of this page. If you have made any changes to your wiring, your ignition system, or other related components, this map may not be ideal for your vehicle. You will then need to check and confirm the appropriate settings and properly configure your DIYPNP EMS for your altered vehicle. Some maps offered may be more completely tuned that others, some may be just setup enough to get the car to fire up and idle with a little help from the throttle. That’s when the tuning begins.
In short– We’ve provided you with the building blocks for an incredible EMS. You are however responsible for the implementation and your own successes or lack thereof, but rest assured that we’re here for you and we’re going to do everything in our power to make sure your project is a success.
For more information on configuring and tuning your DIYPNP EMS, and for information on adding and tuning custom MS2/Extra features, read up athttp://www.msextra.com/ms2extra/. In fact, everyone implementing this system should read that manual from front to back if you really want to harness the power of the DIYPNP EMS.
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