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Join Date: May 2002
Location: Santa Barbara, CA
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Sal,

the injector driver in the 059 box is not PWM. Also it is missing the current sink for the switch-off spike from the inductive load. The driver is a simple Darlington and will most likely overheat when you increase the load signal away from idle. I am sure the DME will idle the 3.2 fine. But if you run it WOT down the straight it will get very very hot in there.

Modern MOSFET devices have very low RdsON values resulting in low losses and can deal with these complex loads. The older transistors weren't like that.

The 3.2 has all six injectors parallel and uses low-impedance versions - this is why Bosch had to use PWM.

Ingo
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1974 Targa 3.6, 2001 C4 (sold), 2019 GT3RS, 2000 ML430

I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs
Porsche "Hammer" or Porsche PST2, PIWIS III - I can help!!
How about a NoBadDays DualChip for 964 or '95 993
Old 05-18-2010, 07:11 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #23 (permalink)