Engine-wise? Yes.

I may drop in a new clutch depending on what Frank says. I have issues in 2nd/3rd when I drop the hammer. There are slight/half second "dead spots" in acceleration where it feels like the clutch is slipping slightly.

Frank says it may be too much juice for the stock clutch. SC combined with the new diff is putting too much stress on it and it just can't hold. I actually had it break wide open under stress in 3rd with the pedal to the floor at high RPM. Funny though, I didn't get that burning clutch smell.

Have had that happen to me also, I still have not upgraded (on stock) but I know mine is slowly failing. If I go hard my clutch is stuck in 3rd gear and I have to slow down and wait and then re-engage, plus some flat spots now and again.

I knew it wouldn't last forever but I figured I'd just run it nose first into the ground until it was time to buy a new one. Not like I could sell a used OEM clutch anyway right?
Also "flat spots" is exactly what it feels like. It's a half-second hesitation.

Me being paranoid, I was afraid I had a piston misfiring or something, then I was convinced my oil smelled wrong.
Turns out I'm just paranoid (but I knew that already).

If nothing else, the E85 conversion buys me some peace of mind.

My tuner was working on my car was trying to fix my flat spots as we first thought it was a tuning problem, and it helped but after some driving we concluded it was probably the clutch slipping. Never finished my WOT tables so I do not go full boost, but after thinking instead of going back now I just want to jump to e85 and do a complete re-tune from the ground up.

That's exactly what I'm doing. New injectors/new pump so I'd have to do it anyway. Only this time, I'm not worried about blowing the motor so I get to see how far I can push it.

Clutch slippage is very easy to see in a data log of rpm vs rear wheel speed sensor over time

Updates?

Update(s):
-Clutch wasn't slipping. I have a faulty BPV that sticks open sometimes which resulted in that weird "slipping/power loss" feeling.

-BPV is being replaced with one that does not require regular maintenance which is a good thing since you can't get to it without removing the bumper.

-Frank is going to call the guy from CJ motorsports/forum member guy to figure out how to fix the fuel pressure issue. Once the big injectors and pump dropped in, on pump gas we were seeing north of 70psi (lol). I mean technically, it probably doesn't need to be fixed if I'm going to run around on E85 all the time but I'm somewhat of a perfectionist and also want that pump gas tune to fall back on. I sent Frank the CJ thread from the FI forums and off he went.

What BPV are you looking at, it might be the cause of my power loss when we were doing my WOT tables. We were thinking it was clutch also, but could not put a definite answer at the time (still need a new clutch but may as well replace the BPV to something better).

Frank is the man. He has a G37 in right now with the same SC kit having the same issue and once my car came in, he put 2 and 2 together.
Looks like I'm going with this:

Synapse Engineering | Official Page for Blow Off Valve, Wastegates, Intake

Apparently, the Turbosmart BPV requires "regular maintenance" and this one does not.

Haha man, this has turned into a meeting of the minds.
Frank, working with the guys at CJ Motorsports and the guys at Z1 now have a gameplan. Unfortunately, it's going to cost more money (because of course it is).

Drilling out the swirl jet resulted in a small pressure drop but not enough to run the car safely. I am upgrading to a stage 1 CJ Motorsports fuel return system along with the Synapse BPV to go with the AEM fuel pump and the 1000cc ID injectors.

Paid for the parts today. With a little luck, it will be done next week.

Oh and if anyone wants to check it out in-person, it'll be in the Hill's charity car show this Sunday. Can't vouch for how clean it's going to be seeing as it has been sitting in a garage for a month and a half now.

tl;dr summary:
1) 1000cc injectors on this car are very difficult to wrangle
2) E85 tuning is a bitch
3) 1+2 = tuning nightmare but our 370z.com sponsor brain trust seems to be pretty confident that they have a solution.
4) Turbosmart BPVs require frequent lubrication or they'll stick and eat themselves.

Is this the Synapse model you got: Synchronic DV Replacement Kit for Bosch BPV: Official Synapse Store | Buy our DV, BOV, and Wastegate with Synchronic Technology and more | Synapse Engineering

Synapse P# DV001A.003
DV001A.003

Here's the fuel return system:
http://shop.cj-motorsports.com/CJM-S...tem-370zs1.htm

This thread should be moved/archived once I'm done with it to prevent future headaches.

So Hill's ordered the wrong valve. The correct part number is DV001A.006 (slightly different flange). Moving this discussion to my main build thread. Don't want anyone to end up with bad information.