[Schläfer]

Just curious what type of curve guys are running and why. Map 7 with a BEF flattens out at 3.5k with a slight bump at 5k before tapering to redline...

Map 7 w/BEF
RPM Boost
1500 16.0
2000 16.5
2500 17.5
3000 18.8
3500 19.5
4000 19.5
4500 19.5
5000 19.8
5500 19.5
6000 19.0
6500 18.0
7000 17.0

I was runnng a flat 22 psi target on the stock turbos, which they obviously couldn't hold to redline, and I think the difference between boost and target was causing major over boosting during shifts (and HPFP dips, and timing drops), even with ASBR set to 100. So I started running a taper from 22@5k to 18@redline, then arbitrarily did the same thing for <3k...

Current Map 6 targets
RPM Boost
1500 19.0
2000 20.0
2500 21.0
3000 22.0
3500 22.0
4000 22.0
4500 22.0
5000 22.0
5500 21.0
6000 20.0
6500 19.0
7000 18.0

This is on an '08 535xi FBO+ inlets, stock turbos, e50 mix (Mr. Fuel It Stg 2)

With this curve, the turbos stay pretty close to target in 4th, still drop off in 3rd, but over boosting after a shift is no longer an issue (ASBR is still at 100, though).

So what does your target curve look like and why? I'm mostly interested in stock turbos but would be curious to see larger twins and singles as well...



Matt G.

[seroga1986]

Mine is about the same but i push them to 24psi from 4000-5000. Been at this for over 10k miles. Rips good. No fuel issues with stage 1 on e55.

[Schläfer]

Looks like you've been making good power on the stockers for a while, I may have to give the KR option a try...