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1. #4.3 vortec ecu tuning how to#
2. #4.3 vortec ecu tuning mod#
3. #4.3 vortec ecu tuning mods#
4. #4.3 vortec ecu tuning code#

The HEI module will ground pin 24 to trigger a spark input.

#4.3 vortec ecu tuning mods#

#4.3 vortec ecu tuning code#

This one can be used with both B&G code and MS2/Extra, although the settings aren’t quite the same as the ones in the regular MS2/Extra manual. Using the MegaSquirt-II PCBv3.0 or V3.57 – Original setup (Note that positive numbers denote BTDC, and negative numbers denote after TDC.)įor further reading, check out the MSExtra forum on GM HEI ignition modules. To do this, get your engine warmed-up (otherwise the timing moves as the temperature increases) and idling, then use a timing light to verify to be certain your actual advance as shown by a timing light equals your the advance display on the advance gauge in TunerStudio. Changing the Trigger Offset in TunerStudio will not change the displayed advance, instead, it changes the actual advance as seen with a timing light. You’ll need to use these buttons and a timing light to make the number on your light, and the big number on the left in the Trigger Wizard, match up.īefore tuning your advance table, be sure to use a timing light to verify that your ‘ trigger offset‘ is calibrated. The +/- buttons on the trigger wizard will adjust your trigger offset. The trigger offset setting will vary according to your distributor position (where it is in rotation) but you’ll need to set it properly… Basically you use the Trigger Wizard and adjust the ‘trigger offset’ and/or twist your distributor until the advance number in the Trigger Wizard matches what you’re reading with your timing light. You must also set the initial position of the trigger (called the ‘trigger offset’), then check it using the Trigger Wizard in TunerStudio (Tools Menu). More information on setting Trigger Offset:

Trigger angle / offset = 10 (this will vary, depending on the distributor orientation, see notes at the end of the article).If you are using a relay board, the IAC wires will come out on terminals S1 through S4. If you are using our wiring harness, connect the IAC using the four IAC wires.Connect the E pin to MS3X pin 14 to send the timing signal to the HEI module.Note that the DIY Autotune wiring harness has a shielded wire – connect only the inner wire to this pin! Connect it to pin 24 on the Megasquirt main board, or the Tach pin on the relay board. The R pin is the HEI module’s tach output.You do not need any mods to make this work. Note that this does not allow sequential injection, as HEI provides no cylinder identification. While factory injected will not need this, the relay board is very helpful when you are swapping an injected motor into a car that never came with fuel injection from the factory. This article also mentions the relay board. For the pre-mod kit version of this article, click here.

#4.3 vortec ecu tuning mod#

We’ve recently developed a HEI mod kit that gives a stronger RPM signal in cars with noise problems. When using a Megasquirt-I, you will need to adjust the idle speed screw to obtain a fast enough idle in cold weather. For those of you who are looking to do a less expensive installation, you can use the Megasquirt-I, but this will not have provisions for controlling the IAC.

It can control a HEI ignition and the stepper motor idle control found on these engines using its standard hardware. This ECU installs on ’80s era GM engines like it was designed for them, which isn’t far from the truth since it comes pre-calibrated for all GM sensors.

#4.3 vortec ecu tuning how to#

This article will show you how to set this up whether you’re dealing with a car originally equipped with this engine or swapping it into a vintage machine.įor these engines, we recommend using the Megasquirt-II.

Also these two injection systems are also very popular for swaps into street rods, S10 pickups, and muscle cars. Not only do they show up in many trucks such as the C1500 pickup, but also Camaros, Firebirds, and Corvettes, and other cars as well. The Tuned Port Injection and Throttle Body Injection versions of the small block Chevy and used very different hardware, but similar electronics. Much of this article will apply to other 1980s era GM cars including injected big blocks and even fire V6s. Pre-Optispark small block Chevy V8s with TPI or TBI injection and HEI ignition with electronic spark timing (seven or eight pin HEI module)