Trunk lid popper

 

I like the trunk mechanism on the Audi A3 2015 car. The trunk opens all the way up by remote. When you’re carrying groceries it is very convenient. I usually carry two bags for my work commute and the MX-5 trunk will only open an inch or so, causing me to have to put my bags down to open the lid all the way. After a closer look at the current mechanism, I thought it would be easy to add a couple of torsion springs, to help the trunk lid open-up all the way, by remote.

I found on the McMaster  good size torsion springs and designed simple brackets to attach them; I 3D printed the brackets from ABS plastic and they seem to do a good job!

Spring-holder-Assem1

Parts from McMaster-Carr (updated):

  • 9271K125 –  180 Degree Music-Wire Steel Torsion Spring Left-Hand Wound
  • 9271K124  –  180 Degree Music-Wire Steel Torsion Spring Right-Hand Wound
  • 94850A129 – No-Slip Clip-On Barrel Nut 1/4″-20 Thread Size  – 2
  • 8863T23 –   Vibration-Damping Loop Clamp, 3/16″ ID, 1-1/8″ Long  – 2 (to attach spring to the lid)
  • 94779A840  –  Head Screws, Black-Oxide, 1/4″-20 Thread Size, 3/4″ Long -2

Updated 3D printed parts are here .

Bracket attached to the hinge with one screw. Spring need to be cut on one sde for 2″

final-right

Of course closing the lid now requires a little more push, but not much. This modification is simple. I really like this new feature in my car.

 

 

 

 

 

The latest design does not require you to install a loop clamp on the lid, just a plastic pad on top of the screws.

Updated on 10/1/2017

MX-5 2017 RF has slightly different hinges, to make my design work in both car versions I have designed new plastic parts.

RF-left

In the RF model this design works very well, however the Soft Top version still has some cosmetic issue. The soft top trunk lid is lifted 0.5-2 mm above the body line, the RF seems to not have this problem.

For most recent implementation, here is the  new document Installation-rev4 (updated on 10/23/2017).

 

 

 

One thought on “Trunk lid popper

  1. Pingback: Trunk lid liner | Gadgets for my MX-5 2016 (ND)

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