2.7 stroker wont go past 3500 rpm

[MrK]

I just finished my stroker project (minus the smt-7... still waiting for that), and I'm getting this weird problem that I can't figure out:

The engine won't rev past 3.5k when stationary, and won't rev past 3k rpm when moving. If I LIGHTLY press the accellerator though, I can edge past this point and SLOWLY build more revs. My narrowband a/f gauge is showing me a drastic leaning at around that same point.

My first thought was unmetered air, but the car idles fine and is very smooth from idle UNTIL 3.5k rpm. I checked hoses etc anyways, and found nothing.

My second suspect was the 2.7 chip I had put in. Swapped it with the original chip, same behaviour..

Any ideas as to what's causing this?

Background info:
2.7 stroker using high CR pistons
304 degree schrick
535i injectors
2.5 bar FPR (the 3.0 made it stumble and stutter badly)
normal m20 AFM (working properly.. I checked)

[var1ant]

From what I understand, the m30 injectors aren't going to work because they are high? impedence or something? someone verify please.

[MrK]

No the injectors have worked before... so that can't be the problem. I'm thinking maybe it's the adjustable cam gear...

[der affe]

slightly off topic, but what was the 3.0 fpr from, and what was the 2.5 frp from?

[nando]

3.0 is standard M20B25, 2.5 can be found on ETAs.

[MrK]

fixed the problem for the most part. Funny enough, replacing the 2.5 bar with a 3.0 bar again and using hotter plugs eliminated 80% of the problem. Still stutters RARELY at sustained high rpms, so I'm gonna review the fueling system again.

Oh, and I used the 2.5 bar from a 320i, but I'm sure it's the same 2.5 that the eta has.

I'll ditch both FPRs and install my bavauto AFPR as soon as I find a freakin fuel pressure gauge in this wasteland...