Sunday, August 6, 2023

Determining the Vertical Orientation of Getrag Transmission Relative to the Adapter Plate

 When making the previous adapter plate for use with a Warp11 series NetGain motor, the rotational orientation of the adapter relative to the motor was not critical as the power cables exited on the side of the motor.  By contrast, with the Hyper9, it is desired to locate the three terminals at the top of the motor, and all in a plane parallel to the floor.  If so located, then it will be possible to attach a controller or controller housing box directly on top of the Hyper9.  



DSC01947 Picture of a the Getrag 5 speed transmission installed in the E36.  Note that the seam in the transmission casting seam is exactly at the bottom and center when installed.  The center part of the cross piece is parallel to the floor, and thus perpendicular to the transmission seam.  Note that the mounting points on the right are higher then on the left.

To mimic the installation of the transmission, a spare gear box suspension cross piece (BMW OEM  23701136498, $58.93 on eBay) along with a pair of rubber bearings (BMW OEM 22316799331, $21.52 on eBay), were then attached to the transmission tail.  Two pairs of fully threaded bolts allow the transmission to sit squarely on the floor.



DSC01970 Top view of the rear transmission  suspension cross piece.  Top of picture is toward the front of the car. 


DSC01971 The fully threaded M12-1.75 ( L=  40 mm left and 90 mm right) bolts allow the transmission suspension cross piece to be leveled when resting on the floor.


DSC01978 Showing the adapter plate attached to the transmission on the left and the tail of the transmission mounted on the suspension cross piece on the right.  


DSC01980 Close up of the mounting.  The 4 bolts of the suspension cross piece permit leveling of the transmission from each direction.  


DSC01988 Showing the location on the current adapter plate where the top of the Hyper9 will be located.  When the Hyper9 is attached the center terminal will be in this plane. 

The Hyper9 has four mounting holes that relative to center and vertical are located at 45, 135, 225, and 315 degrees.

DSC01967 of the serial number for the transmission for the transmission being used.

This transmission 4USCC7328SLA01518  (2 121 643) has a slightly smaller outer contour when compared to the existing adapter plate.  This was also the case with the other Getrag transmission that was used. 



DSC01968 The bolt pattern is identical but the transmission contour is smaller then the adapter plate..  



DSC01969 Showing the slightly smaller outer contour for the entire periphery.  Bolts used for the pair of dowel pins is M12-1.75 x 90mm.