I replaced the oil pump seal and after inspecting everything (post heat cycle), I can now say it’s officially leak free. YES!!!!
Back on the ground
Now that everything is more or less wrapped up, I was able to finally get the car back on the ground. Nothing looks stranger then seeing the car on the ground after being on jack stands for eight months. Damn it looks good!
Air jack test
Now that we’re back on the ground, I was able to test out the air jack system.
The good news: Everything performed flawlessly and is leak free
The bad news: The system needs more then 175psi to fully lift the car, so using compressed air (from my garage system) is a no go. I figured this would be the case but had to try. Thankfully however, I have a few bottles of nitrogen for this very purpose.
What I discovered:
First: Despite the front weighing the most, it lifts very easily and quickly. This is a result of using two air jacks for the front. At full extension I’m able to get the wheels four inches off the ground. If I adjust the position of the jacks I can probably get another two inches before they hang too low. An easy and as needed workaround is simply sliding some wood blocks (spacers) under the jacks to give it that extra height.
Second: The rear, despite weighing the least and being the first to extend (closest to the air source) is the hardest to get in the air. It’s a result of two things. 1) The rear uses one air jack (tripod setup). While it’s more than enough, that single jack takes the entire load. 2) Since the front lifts so easily, it ends up sending extra load/weight to the rear, forcing the rear air jack to compress and not get full extended unless I use the appropriate air pressure. 3) Since I have a killer nitrogen pressure regulator, I was able to see how the system performs under very precise pressures:
150psi – is enough to lift the car/suspension about two inches, but not off the ground.
175psi – will raise the front another two inches, but not off the ground and the rear will remain the same but under more load.
200psi – the front raise another two inches, barely off the ground and the rear will come up another inch, but still on the ground.
225psi – the front is in the air about two inches and the rear is just barely on the ground.
250psi – the entire car is in the air by about two to three inches
275-300psi – the front and rear become fully extended and raise the car another inch or two, leaving a four inch gap between the wheels and ground. The bottle I was using ended up running out of nitrogen so I didn’t get a precise air pressure measurement.
I still have a lot of fine tuning to do, including leveling the system (front and rear) and also adjusting the air pressure bleed off (exhaust valves). As you’ll see in the video below, the exhaust valves are basically dumping the air pressure rather than slow bleed-off. It’s great for fast pit stops but can be problematic by slamming the suspension. Adjusting the exhaust value “throttle ring” should fix that.
Here’s the YouTube video:
– Test drive
– Test drive