20 months ago I had no clue.
Now I can tell you exactly why it did everything it did.
The crazy part? Before all of this, the car spoiled me. Aside from maybe 4 to 5 weird electrical limp mode events, it was basically flawless. Oil changes, brakes, tires, normal maintenance. No real issues. All the upgrades I did to it worked and I pushed it from a 12.3 quarter mile car to consistent 11.0s and a platform record that is still standing.
Then came the full chaos package. Crazy front remote mounted turbos, custom fuel cell, built motor and built transmission. And I went all in on the build. Engine bay painted, unibody undercarriage painted, engine painted and powder coated, transmission painted. Everything looked right. Everything should have been right. So the first real step was not send it. It was engine break in.
That moderate load break in period acted like a shield. The car ran ok so I was happy. But it was not in a position to reveal why it was not really happy at all. I could not go wide open throttle and expose the real problems yet.
It started simple or so I thought. Coolant leak from the wrong intake manifold cooling gasket, installed wrong, then not even the right part. Fixed that and immediately ran into drivability issues. Choking under light throttle, stumbling back to idle. Little did I know this moderate load choke behavior was the root cause of all my nightmares coming soon. This was the electrical gremlin checking in for the first time and I thought for sure it was a fuel calibration issue. With the fuel system completely changed, the tune was the first logical culprit. I believed the hardware was installed correctly so I chased calibration. Raising idle RPM helped but really it just bumped alternator output and masked a deeper electrical weakness.
Then I started chasing oil. Engine bay splatter eventually led to the realization that my engine builder reused my original VVT solenoids and gaskets. The gaskets were completely torn and all I can think is they got damaged when the valve covers were removed to get powder coated. At first I tried sealing them with high temp silicone just to keep moving.
Around the same time the turbos started smoking and that turned into its own nightmare. Oil return went through four total versions before it was actually right. The original setup, first failed revision, second failed revision, then the third revision and fourth and final install. Twice I ended up with oil splatter out of the exhaust and a bunch of oil in the intercooler. That meant pulling pipes apart, cleaning the intercooler, cleaning the charge system, reworking the drains and starting over again.
And this became the theme with the whole car. Every time I fixed something I thought I was good. Everyone thought I was good. Then the car would expose the next layer.
The oil return already had a pump. The TurboWerx base pump rated around 1.75 GPM which works with most twin turbo systems. Just not mine. Not with my turbos mounted that low and the return angle less than ideal. What finally worked was stacking the fixes. Proper rerouting, clocking the turbos about 20 degrees, adding water to the turbos and upgrading to the TurboWerx EXA Mil Spec pump rated at 3.0 GPM open flow. That combination finally solved it. Only then did I circle back and fix the VVT solenoids properly with new parts and gaskets.
Meanwhile my blow off valve piston was completely frozen shut. My PCV system was choking the engine. Clogged filters and a breather cap not designed for twin turbo blow by built crankcase pressure and blew out spark plug gaskets. That forced another round of valve cover work followed by a full upgrade to baffled catch cans with -12AN lines. Finally I could make a pull but under load especially multi gear the car fell apart.
That same electrical gremlin came back with a megaphone. Under wide open throttle and multi gear pulls I was getting voltage drop across the entire engine bay. Throttle body, ignition coils, injectors, transmission. Everything tied into those five critical engine bay grounds and straps. What looked like tuning problems, throttle closures, spark cuts, boost cuts, poor boost recovery, weird shift behavior, was the car losing electrical integrity exactly when it needed it most.
And then there was another layer most people overlook. Dead system DTCs. The ECU does not care if you do not need a system anymore. If it sees a fault it reacts. It goes into protective logic. Same as unplugging your MAP sensor. The signal is gone and the car runs like garbage. Same idea with things like electronic blow off valves. If you go mechanical but do not disable those systems in the tune, the ECU thinks something is broken and starts pulling you back. All those dead systems had to be properly disabled so the car would stop protecting itself from problems that did not actually exist anymore.
Then it lost all transmission power. That was the moment everything stopped being a normal troubleshooting process and turned into an origin story. I spent the last 5 months learning why that happened, where it started, what systems were involved and why so many parts looked guilty when they were really just reacting to bad conditions.
Not to mention all the smaller battles along the way that add up. A few fittings that leaked and had to be remade, fender liners I added and modified, moving the O2 sensors so they stopped lying, using ARP torque converter bolts to match the billet flexplate, finding rear subframe bolts and even the steering rack not torqued properly, chasing a floating alignment and even a fuel sending unit that lied to me leading to running out of gas mid diagnosis.
And people ask all the time
Why is it not done yet
How much power does it make
How fast is it in the quarter mile
I am over here doing something different. I am not chasing a number yet. I am making the car honest so when I do lean on it the data means something. So I can actually dial it in on 93 the right way.
It was system integrity the entire time.
I did not need to keep throwing parts at it.
I needed to understand the conditions those parts were being asked to operate in.
That is the difference now.
Right now there is not a thing I do not understand or do not have an answer for.
I do not fully trust the solenoid valve body, TRS or GH torque converter yet and I have replacements on deck ready to go in if needed.
But the car is feeling sane again.
Like it used to feel.
Clean. Solid. Ready.