Toyota VAST ignition and MS-II

This forum is for discussing ignition setup, tuning, and troubleshooting for MS-II. Click these links for info on GM's HEI, EDIS, direct coil control, others.
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katok
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Post by katok »

lospeed wrote: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
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Post by 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.
Toyota RA28 Celica.
18R-GE|2.0L|Twincam8|9.7:1 pistons
MS-II|V2.687t4 code
Enchanter
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Post by 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
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Post by 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
22returbo.net
1981 Toyota 22r Supercharged (fuel only)
1981 Supercharged 22R
1988 Toyota 22RE Turbo (SnSE 029v MT 2.25 )
1988 22RE turbo
Enchanter
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Post by Enchanter »

Enchanter wrote:... 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 :)
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