Megasquirt in my 16v by JonnyPhenomenon

3 minute(s) of a 208 minute read

megasquirt is built!

had a couple snags along the way. but nothing that I couldnt get around.

So. To help clarify for anyone who might read my thread in hopes to get some useful information about putting MS on a 16v, here are some of my notes.

Important: the 16v engine uses a PWM fidle gizmo to control the idle. the instructions for the megasquirt build on http://www.megamanual.com are a bit confusing when it comes to this option. I hope to clarify this.

you are probably going to use stock 1.8t or g60 (bosch) injectors in your 16v ms install. these are high impedance. there is a chart somewhere that lists all sorts of injectors by part number and lists there impedance. Knowing this information helps with the deccision you will make at step 69.

Megasquirt 2 (II) v3.0 PWM IAC howto:

Skip step #22

this step could have you installing a ton of parts that you would later have to remove if you don't read it carefully. 

this step builds the circuit used to control a stepper IAC with a Relay and the stock IAC is PWM and cannot be operated this way.

the important thing here is that you are not using a STEPPER iac, but instead you are using a PWM iac. so skip this whole step and go to step 23. 

When you get to step 62

Step 62:

here you will be building the circuit for the PWM Idle Air Controller. the PWM IAC can not be operated by a relay, as the device opens and closes really fast and the relay wouldn't work. 

(relay number 2 (IAC) on the relay board will have to be bypassed) 

so to get around this, we use a high powered transistor in the MS ECU. you can buy the "mod kit" from diyautotune for 7$, or you can just go to radioshack and pick up the parts there. (Use the websites store locator and call ahead to make sure they have it in stock.)

you will need three things, but depending on the decision you make on step 69, you may have two of them already.

TIP120 Darlington transistor. Radioshack part number 276-2068. $1.59. you NEED this so get your shoes on.

TO-220 Mounting Hardware - this is the mica insulator peice. your kit has two of them, and if you are using high impedance injectors, you will have two left over, so consider this and maybe save yourself a couple bucks. Otherwise, radioshack has em for 1.99$ part number 276-1373

1n4001 rectifier diode. this is the same diode you will use often in your kit. and if you use high impedance injectors, you will have a couple of these leftover. if not, radioshack part number 276-1101 for 99 cents. 

Step 69:

flyback circuit for Low impedance injectors

if you are using high impedance injectors, like the stock g60 injectors that work so well with this setup, you will want to skip to step 70. do not do anything in step 69. this will leave you with a bunch of left over bits. (and save you 30 minutes and 2.98$) It will also leave room for you to install the TIP120 transistor in the place where Q9 would go. 

Thats all for now. Ill post more when I have more time.