ZF 4HP22 step by step.

corazon

Well-Known Member
Good news!
Still yet to test my setup but final spec will be 4.8 with edelbrock 500, strong ZF hybrid and 3.54 Jag LSD, should be a good combination by my calculations
 
Off topic slightly, but I need some guidance...

I was given a 4HP22 out of a BMW 320 (E36 I think), it probably needs rebuilding because it ran with low oil level, but before I do that, it had a big electrical connector on the side meaning it has an ECU somewhere, my question is, is it a stand alone ECU or will it likely be integrated into the engine ECU as well? It had it's identification plate removed at some point, so I have no idea what actual model it is.

The master plan is to fit it to my P6 and for that it will need to be mechanically controlled, hence my question.
 
There is an electronic version of the 4HP. I wonder "how electronic" is actually is. I had it on my BMW e34 5 series. It had a "sport" and "normal" selector but didn't appear to drive much differently to any other auto apart from the shift points.
 
PeterZRH said
"There is an electronic version of the 4HP. I wonder "how electronic" is actually is. I had it on my BMW e34 5 series. It had a "sport" and "normal" selector but didn't appear to drive much differently to any other auto apart from the shift points."

That's the early type Peter the first of the so called EH versions, the switch actuated a solenoid that made the shifts a bit harder, a bit of a sales gimmick rather than a fully electro hydraulic unit, the box would work with or without the switch connected as it's an " OFF " type.

The fully EH boxes need an ECU that feeds information from the engine management system to control exact shift points,
There is no governor only a speed sensor that returns a signal and the control unit is fully electro hydraulic operated so it will not perform at all without power.
 
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