Toyota VAST ignition and MS-II

[katok]

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

i try using the TIP41c ,but it did not fire the coil..
then i used VB921 ... it triggers the coil and works fine.

i'm planning to used TIP120 because it's cheaper..

[The Witzl]

has anyone tried using a Toyota ESA type ignitor like from a 20valve 4A-GE or any other Toyota engine where VR signals go to the ECU?

Just wondering if these types of ignitors (ESA types) have dwell controlled by the IGt signal as per the VAST systems?

ESA ignitors usually have the following connections:

- IGN
- COIL (-)
- Tacho out (to dash)
- IGt
- IGf


A lot of commonly available Toyotas at the wreckers in Australia have ESA type EFI systems, so i wouldnt mind pinching one of these commonly available ignitors.

[Enchanter]

I thought pretty much all Toyota igniters were smart (controled the dwell).

Im not far off installing ms2 v3 board on my ESA 5mge (6 cyl) but I was going to run the Ne (24 tooth modified to 12-1 by two) to ms2 and control the coil directly thereby leaving out the igniter.

I really dont know if this is the wisest option, should I use the igniter instead ?

Also, will the Ne wheel work the way I think it will, as in grind off two teeth opposite each other to simulate a single 12-1 crank trigger ?

[dcg9381]

Dunno if this applies to ESA, but there is an interesting how-to in regard to early 22R ignitions systems and using a bosch unit instead of driving the factory ignitor.

Bosch unit apparently controls dwell itself:

http://www.celica-gts.com/forums/index. ... opic=11116

[Enchanter]

... but I was going to run the Ne (24 tooth modified to 12-1 by two) to ms2 and control the coil directly thereby leaving out the igniter....
..Also, will the Ne wheel work the way I think it will, as in grind off two teeth opposite each other to simulate a single 12-1 crank trigger ?

The 24 tooth wheel is run by the dizzy by the way, hence my wanting to simulate a single 12-1 wheel by having a 24-2 with opposite teeth removed.

I dont see a problem but once I grind the teeth off i cant put them back on so id like to be sure