Toyota VAST ignition and MS-II

[Bernard Fife]

Hi all,

With some encouragement, and some leads on info (thanks Steve!), I have started to put together a document on using Toyota's VAST ignition system (used on the 4AGE, etc.) with MS-II.

I have been going through the forum posts on this topic (thanks Jerry, jamesl, froej25, and many others!) and have collected some preliminary information here:

http://www.megamanual.com/ms2/vast.htm

I will be adding a number of illustrations over the next week or so.

Could people who have more experience with this ignition that I do please have a look and comment in this thread (especially if you are running MS-II). I am sure I have included a number of mistakes, and omitted a number of important points... Thanks!

Lance.

[lospeed]

nice..

thanks ..this is very informative..


i notice that the 4age JDM igniter don't have NE signal input like the US version ingiter.

[Bernard Fife]

the 4age JDM igniter don't have NE signal input like the US version ingiter.

lospeed,

Thanks, do you know what they did use for the JDM igniter signal?

Lance.

[lospeed]

Hi lance,


the jdm igniter is almost the same as the usdm except for the NE signal from the igniter going to the ecu.

here is the common pin configuration of the JDM igniter.

1.)IGF
2.)IGT
3.)B+
4.)Tach output
5.)Coil

[lospeed]

the article suggested to used TIP120 because its a lot cheaper than the VB921 for switching the igniter.

i'm planning to use TIP41c instead of the TIP120 because i have a spare of this transistor at home,

i checked their data sheet and
notice that the TIP41C is "NPN epitaxial silicon transistor"
while the TIP120 is "NPN epitaxial darlington transistor"

will i encounter any problem when i used the TIP41c transistor?
what is the differences in the performance of this two transistor?


thanks

[Bernard Fife]

lospeed,

I had a quick look, and the TIP41C should work. The pin out looks compatible, at least.

The TIP120 is a 'Darlington pair' meaning it is really two transistors in one package, one driving the other, so it can control very high currents using very small signals from the processor.

However, for switching purposes, the current is typically quite low, and the small gain (called hFE) should be fine.

This is no guarantee it will work though, so try it and see.

Lance.

[ivanlau78]

does any one success running 4age with new beta code?

[dcg9381]

So I've read over the information provided by lance and other contributors:
http://www.megamanual.com/ms2/vast.htm

I'm doing a 1988 Toyota 4runner (22re) that uses VAST as OEM.

Some hardware changes are needed to accept square wave 12v.

Output again requires some harware changes to provide enough current to the ignitor...

It is interesting to note that the ignition system should start and run with base timing, without any signal... A good starting point.

My relative newbie questions are:
1) Is there any advantage to running a crank triggered sytem (hall effect) with more teeth on it other than increased resolution and timing accuracy?

2) Will a typical hall effect crank trigger system require hardware changes as it's not square wave?

Seems to me that you could almost build a plug and play adapter between megasquirt and toyota TCCS (other than dealing with the OEM tach).

[dcg9381]

So I've read over the information provided by lance and other contributors: http://www.megamanual.com/ms2/vast.htm I'm doing a 1988 Toyota 4runner (22re) that uses VAST as OEM. Some hardware changes are needed to accept square wave 12v. Output again requires some harware changes to provide enough current to the ignitor... It is interesting to note that the ignition system should start and run with base timing, without any signal... A good starting point. My relative newbie questions are: 1) Is there any advantage to running a crank triggered sytem (hall effect) with more teeth on it other than increased resolution and timing accuracy? 2) Will a typical hall effect crank trigger system require hardware changes as it's not square wave? Seems to me that you could almost build a plug and play adapter between megasquirt and toyota TCCS (other than dealing with the OEM tach).
1981 Toyota 22r Supercharge
-------------------- m2f -------------------- This post is at: http://www.msefi.com/viewtopic.php?p=135460#135460 -------------------- m2f --------------------


Posted by email.

[katok]

Hi Lance,

Is the toyota igniter control the dwells?