Detailed Power Output Stage (POS) post updated to include new information

[UrS4boy]

Two photos and a pdf:


Photo courtesy of Mcandmar on the S2Forum


Photo Courtesy of UrMarvin on the quattroworld UrS forum (my home forum).

And then there is this: Bosch specs on the 0227100209 (Audi 4A0905351A) POS

All of the above have been added to this:

Detailed Power Output Stage (POS) info from the Engine Bay Device Map in the quattroworld UrS FAQ

http://forums.quattroworld.com/s4s6/msgs/15284.phtml

[mouse]

It's worth noting that POS can be fairly easily repaired as detailed in the link posted here:

http://www.s2forum.com/forum/showthread.php?t=57606

One I repaired has had no problems for a year now.

[UrS4boy]

It's worth noting that POS can be fairly easily repaired as detailed in the link posted here: http://www.s2forum.com/forum/showthread.php?t=57606 One I repaired has had no problems for a year now.

Thanks for the reminder. I had to laugh when I saw my post in that thread. A pretty butterfly must have flown by because I forgot to add the link to the repair to my POS post. I will do that now (I have created a pdf of Sigi's post).

http://12v.org/urs/RepairingABoschPowerOutputStage.pdf

Now in this: http://forums.quattroworld.com/s4s6/msgs/15284.phtml

[Hammer786]

I got a replacement POS unit just before Christmas. It's got the part number 0 040 401 027, not sure if it's the correct part or safe to use on my car for a little experiment.
Looks like the Brown Hitachi one but it's made by BERU.

[UrS4boy]

I got a replacement POS unit just before Christmas. It's got the part number 0 040 401 027, not sure if it's the correct part or safe to use on my car for a little experiment. Looks like the Brown Hitachi one but it's made by BERU.

There are lots of potential alternatives including these:

POS Equivalents:
AUDI: 4A0905351 4A0905351A
HUCO: 13-8052
BERU: 0040401027 0040401063 ZM027 ZM063
BOSCH: 0227100209 0227100210
BREMI: 14052
HELLA: 5DA006623591
HITACHI: DIS405
LUCAS: DAJ122

[Hammer786]

I really should read your links more thoroughly! Bit of a stupid question really.

Thanks for taking a look. Great posts as ever!

[S2central.net]

Here is some nice factory Bosch data (from the 2014 motorsport catalog) - it also points to a bunch of other coils which may be usable on 20VT applications.

Notable aspects are the very low activation current and max primary current of 8.5A... Note also the primary voltage clamping at 380V and how heat conductive paste MUST be used.

[UrS4boy]

Similar to an IM 3.1 data sheet that I have in my library. I thought I got it here but maybe not.

[Fat Audi 80]

Are these parts considered a service Item? I have never changed mine in 16 years, should I get a new pair to ensure optimal performance???

Thanks!

[Lago Blue]

Perhaps more of a possible D-I-Y road-side repair spare item to have thoughtfully stashed in your glove-box for that next away trip.