Whats up HPTuners community!
To be honest I have done a shit ton of research on this issue, but have yet to find a similar scenario to my current problem. To give some background I have a 2006 Mazda RX8 that I put a LS1/T56 into from a 2004 Pontiac GTO. The car runs great, however I have been fighting this intermittent hard start issue. Sometimes you hop in it fires right up and your good to go, other times it take a few times and extended crank time to get it up and running. Once it starts though it idles fine, and drives without any noticeable issues. Hasn't thrown any codes either. Initially for the first several months (not exaggerating, I have been fighting this since Jan and am at my wits end) I assumed it was hardware related so I went through the following:
-Replaced all coil packs (thinking one may be intermittently not working)
-Rebuilt Fuel injectors (replaced the o-rings and filters thinking 1 may be leaking by, and verified before and after that they were not leaking when pressurized to 58psi)
-Plugs are brand new (thinking maybe 1 is fouled or something)
-Plug Wires are new (thinking maybe 1 is cut/compromised causing issues)
-Replaced Crank sensor (cheap and simple, and lined up with a potential cause of hard starts)
-Replaced Cam Sensor (again cheap and simple, and lined up with a potential cause of hard start)
-Replaced Fuel pressure regulator (was feeling good about this one, since the current FPR was indeed bad, but now i get 58PSI on prime and through cranking, and start problem still exists)
At this point, there really isn't more left to replace/check from a hardware standpoint, not to mention it would be odd to have a hardware problem, and it not affect the car actually running/driving and only it starting (in my opinion). This leads me to believe that the intermittent hard start problem I have been chasing may be tune related. Some background on the tune.....I swallowed my pride, and took it somewhere to be tuned so that it could be done right (and paid for it too....jesus) thinking that the hard start problem was tune related, and I was told (yep shes good to go now) but that was bullshit, and it still has the exact same intermittent hard start problem it did prior to the tune.
I was hoping with all the data/background I have provided, and the logs I have attached that you could take a look and see if anything jumps out at you in the tune or the logs that I can try to finally resolve this issue. I have looked at them a thousand times and don't know where to start (no pun intended) to try and solve an issue like this.
To further clarify, the engine is a stock LS1, pulled right out of a 2004 GTO. Has a custom CAI, headers to a 3 in exhaust, and the 5 wire MAF (with the IAT built in), but that is it. No cam, or aftermarket internals, ect.
As for the files...."True_Street_Tune" is the dyno tune I paid for, "TST_Hard_Start" is the True street tune, but i played with the fuel pressure delay thinking that it was telling it to fuel prior to the fuel pressure being built yet (didnt help). "Start" log is one of the times when I just hop in, it starts right up no issues. "Hard_Start" log is another time i hop in, and it takes a few times to get it fired up.
I know this is a big post, and alot of info, but I wanted to be respectful of everyone's times, and try to provide as much detail, and data as I could. Thanks in advance for any help/guidance.