Magneti Marelli BAE 403
http://www.mmcompsys.com/download_zone/ ... oil_01.pdf
Very similar to:
http://motorsport.magnetimarelli.com/PD ... rev4.0.pdf
Technical Data
Nominal supply voltage.............................13.5 v
Charge current...............................................7 A
Dwell (7amp / 14v)......................................0.9 ms
Dwell (11amp / 14v)....................................1.8 ms
Spark duration............................................450 µs
Spark duration..............................................98 ms
Spark current.............................................590 mA
Combustion energy......................................18 mJ
Weight.......................................................180 g
I am driving these with 4 VB921 as they do not have built in ignitors. I am running waste spark from 2 spark outputs, with each take off having a 680 ohm resistor as per the guides.
Taking it out from a new DB connector in place of the LED's.
Running ok, with minimum discharge 0.1, cranking dwell at 6ms, running dwell at 1ms!!!!!!
Looking at the specifications, they require 7amp's for 0.9ms and if i cut the dwell dack, it start to cut out at 0.7ms, so i've settle for a dwell of 1ms.
Cranking dwell is higher, but i doubt this makes any difference.
The VB921 are not capable to supply enough current according to the specification, and it looks like i'm on the lowest setting. This is probably producing a weak spark and making starting harder...but it does fire up, and does run all the way to 7,000rpm!
I do have 4x IRGB14C40LPBF by INTERNATIONAL RECTIFIER coming in the next few days which I will mount externally in the engine bay when time allows. The wil allow much more current but are not internally regulated.
Description
* IGBT, TO-220 430V 20A
* Transistor type:IGBT
* Case style:TO-220 (SOT-78B)
* Voltage, Vceo:430V
* Voltage, Vce sat max:1.75V
* Current, Ic continuous a max:20A
* Power, Pd:125W
* Time, rise:2400ns
* Pins, No. of:3
* Power dissipation:125W
* Temperature, Tj max:175°C
* Temperature, Tj min:-40°C
* Temperature, current:25°C
* Temperature, full power rating:25°C
* Time, fall max:2.8ns
* Transistor polarity:N
* Transistors, No. of:1
* Voltage, clamping:430V
Know very little about the specification required, but in my eyes these looked ok, are readily available and cheap at £3.21 each. 20A will be more than enough to drive the coils, and knowing the dwell of them from the coils tech sheet means there will be no need to scope or guess
I will report on the spark strength and starting once they are installed.
The are listed for motorsport use, but are an OEM part on 1.4 and 1.6 Fiat Stilo, Punto, Idea, Panda - The newest models from about 2004 onwards.
You can get them for £30 a piece from
www.shop4parts.co.uk ad many other sources as well.
Cheers,
Kristian