NightWalker86

Here's an update finally after getting the PLX wideband installed yesterday:

* I purchased a PLX wideband that utilizes a smartphone app instead of a gauge. I wanted this to try and keep the interior as clean as possible. Unfortunately, the app is a bit laggy, but still usable.
* Results were definitely hard to lock down because I didn't really want to gun the car too much in its current state (stock fuel system, boost spikes, old tires, etc.).
* I did get a few good 2nd gear runs though to about 5000ish RPMs and noted that the boost spiked to .70 and the wideband showed (as best as I could tell with the lag) mid to low 12s for AFR.

Couple things to note here:

1. My results seem to be exactly in line with what Banzai has already noted in the dyno comparison thread. A car with similar mods and the same base mod map that comes on new PFCs produced AFRs in the 12s as well.
2. Max injector duty cycle was low for those runs (low 60s).
3. As others have mentioned already, considering how cheap and easy it is to replace a fuel pump, there is absolutely no reason not to replace the existing 25+ year old pump with a new Walbro or Denso unit. As such, I've already got a 255 Walbro ordered from Banzai.
4. Given my results are exactly inline with what Banzai has already established in the dyno thread, it's best to finish the car and get it tuned for a bit safer AFRs and increased power.
5. Also based on the dyno thread, the numerous previous experiences and purchases I've had with them, and time/knowledge they've given back to the community, the car will be tuned by only Banzai at this point. Most likely that means shipping the car to them, but in my opinion, it'd be worth the expense to have it tuned by a pro that 100% knows what they are doing and that has more than earned my trust.

So I guess to round this thread out with a final answer... Yes, TECHNICALLY, it appears you are probably safe with the mods listed on the stock fuel system. That said, you'd be foolish to at least not replace the stock fuel pump and have a proper tune done. You are leaving additional safety and DEFINITELY power on the table.

NightWalker86

Alright, so one last update for this thread. I ordered a Walbro 255LPH pump from Banzai and installed it today. I also went ahead and purchased a generic 3" stainless high flow cat from Amazon along with some stainless clamps (temporary). I got the pump installed without any issues. The original FD Denso pump was still in there and the tank itself looked fine luckily (not all rusty or anything). I cut a section of the midpipe out and temporarily mounted the highflow cat with some stainless band clamps. Took the car for a spin and can confirm that with the HFC in place it isn't boosting higher than .61 with .50 set as the target in the PFC. That should be right around 8.5psi or so. This held to redline with no creep.

I'm going to find a shop that can TIG weld the HFC in place permanently and call it a day for this part of the project. Although, I would still like to get some injectors... Anyway, moral of the story is there was absolutely no surprises with my results (as expected). You COULD get away with the stock pump and injectors as well as TRYING to make a midpipe work... but not worth the risk. I deviated slightly from the norm here since the HFC setup I am running doesn't have an air inlet for the cat since I do not run an air pump any longer and do not intend to reinstall it. That's about the only difference and the main reason why I didn't buy an off the shelf pipe.