#VEMS V3.2 MEGATUNE INSTALL#
#VEMS V3.2 MEGATUNE MODS#
#VEMS V3.2 MEGATUNE CODE#
#VEMS V3.2 MEGATUNE SERIES#

#VEMS V3.2 MEGATUNE CODE#

Under 'basic settings' then under 'codebase outputs and functions', run wheel decoder code type by selecting generic wheel. If you still have problems use time based cranking to avoid these issues.Р”РЋ. I believe hold should be set to 2 to prevent problems at slow cranking or beginning of cranking with blown coil fuses and backfires. *NOTE(12_7_11): I have read about problems with trigger return cranking and hold set to zero. Use trigger return mode with hold =0* and cranking advance angle = 15. Under Spark settings the trigger angle is set to 60. This yields a trigger at 60 BTDC and a return trigger at 15 BTDC. Trigger Position settings(updated 3_16_09): The LS1 damper is not keyed so if you pull and re-install it your timing mark will move anyway. There should be no need to do this on installs, I just did it on the first one to make sure everything worked correctly. I also have added a timing mark and indicator tab on the LS1 engine block and harmonic damper so that I can determine the relationship between megasquirt and the crankshaft. Set 2nd trigger edge to 'rising and falling'. Under 'wheel decoder settings', set 'wheel decoder base teeth' to 24. I did find new info that in the factory setup both sensors are powered by 12 volts, but 5 volts works without the need for other circuitry to interface with the processor.Р”Р€. It has already been confirmed by other people that both sensors return a 5 volt square wave logic signal. The schematic for v3 pcb shows pin 11 is JS8.Р”В«oth crank and cam sensors are powered with 5 volts. jartech007 pointed out an error here in labeling pin 11.

01uf capacitor from pin 11 of the processor to pin 4 of U7 (gnd).

#VEMS V3.2 MEGATUNE SERIES#

Run a wire from IGN toР’В JS8Р’В (pin 11) with a series 1k resistor in between. Remove any jumpers that may be installed on your board to IGN. This is S5 on the terminal block of the relay board if you are using it.Р”Р„dd wire with 1k series resistor from pin 36 of DB37 to pin 11 of the processor. On both of my setups I used the ignition pin 36 on the DB37 for the second trigger cam input. The cam sensor goes to second trigger input which requires a 1K resistor to pin 11 of the processor. 01uf capacitor between tsel and XG2(gnd).Р”Сћ. Run a wire and series 1k resistor between tachselect and tsel. Remove all jumpers that go from tachselect or tsel to vr or opto, depending on how your board was built it may or may not have jumpers installed.

#VEMS V3.2 MEGATUNE INSTALL#

A convenient way to bring the crank sensor input(tach pin 24) directly to processor pin 14 is to install the 1k resistor from the non-banded side of D5 to proc pin 14. Since pin 14 is active low it automatically uses the correct falling edge of the crank sensor input. Bring the crank sensor input directly to the processor pin with a 1k series resistor just like the cam signal. Ground - black or yellow black in some harnesses This will not work with the LS2/LS7 and its 58-tooth wheel, which can be easily recognized by its gray harness connector (the crank sensor itself is gray on 58 tooth engines, thanks for the information 'jartech007'). NOTE: These instructions are designed for LS1/LS6 type engines with a 24-tooth wheel, which can be identified by its black harness connector. The rising edge of the signal is not evenly spaced. The megasquirt must trigger off the falling edge of the crank sensors signal because it is evenly spaced 24 tooth signal with no missing teeth. The crank sensor input goes to the TACH input pin, pin 24 on the DB37. Running MS1 on V2.2 or v3 board using MSnS_extra029y4 or HiRes10e code (I have run with both versions and both v2.2 and v3 boards with no problems)Р”РЋ. The harness color codes in this document reflect my 99 LS1 harness, I have noticed the colors vary on some other harnesses. I also never got to tune this setup so the AFR tables are all 11.0. But at least it will give people a starting point.

Warmups, accell, ASE, cranking PW, required fuel, etc. My car has 150lb injectors so you will need to change virtually all of the settings to make this files work. That is what I run on all my cars right now. MSQ files are attached at the bottom of this post for HiRes10e. (fixed spark/coil wiring to be intuitive, fixed trigger return cranking for quicker starts)

#VEMS V3.2 MEGATUNE MODS#

May be a problem with trigger return cranking and blowing coil/FP fuse, added some info about setting hold ignition to 2 to help prevent this.Р”Р„dded 24 vs 58 tooth crank sensor info (58 tooth will not work)Р”Р„dded better description for v2.2 crank sensor mods V3 pcb cam input JS2 label wrong, changed to JS8, thank you jartech007

Vems v3.2 megatune