Hey y'all,
So I swapped a BluePrint crate engine into my 2003 350z about a year ago and it's been running rich since I first started it up (which apparently defaulted to an open loop because one of the wires on the MAF plug was swapped, wiring harness problem, not BluePrint's fault, they've been great /unsponsored). So the MAF was never even working in the first place...but I ended up fixing that. The gauge cluster was showing 4mpg (confirmed using old fashioned math) and pretty quick drops at idle, quicker than you'd expect.
So my current hypotheses are that the tune on the ECU (E38 I believe) was suuuper conservative and rich or the computer programmed itself horribly/unfairly given terrible initial conditions (no MAF) or it was a combination of the two.
I'll attach the original tune. The only change I've done was adjusting the PE numbers up a bit because my idle TPS is around 23.5% according to the scanner and the tune PE was starting at like 12% and incremented up to 19. Now, the PE EQ ratio isn't that rich, just 1.170 but I figured it was probably having PE enable at idle thus giving a rich mixture. I also stepped up the PE enable RPM up to 900 from 300. Those are the only changes I've made from the default. If you guys think I should step it back and that it isn't the problem then let me know, I would really appreciate the wisdom. I'm still pretty sure my problem lies within the VVE and MAF Calibration though, just from comparing it to stock tunes on Corvettes around that year.
It is a stage 2 cam afaik, it came with the engine 225/238, .612, .585 and I know that means a bit more thirst at idle...but not enough to bring me down to 4mpg even with very very light driving. I get like 9mpg on the highway, holding around 3k rpm but that probably wont be in the logs. I'll include the Default tune for those who are curious, the v1.2 tune is going to correlate to the 1.2 log, the 1.3 tune is my most recent but I have no log of it because I haven't driven it with it. The only differences between the three is in the PE Hot Throttle table as far as I recall. Again, current tune is 1.3 where I bumped the TPS % down a bit from the 1.2 and set a minimum RPM PE enable.
I'd appreciate any quick glances you guys could provide, I just want to know if I am headed in the right direction. Let me know if I can provide any more info. Many thanks!!
Just to add...I'm just tuning for fuel economy for the moment, gas prices in Florida aren't doing well for my wallet and I'm throwing 93 octane in it which honestly probably isn't worth it at the moment. I know these engines can get AT LEAST 15mpg even with a cam.