what is the stock boost#?

[F82TT]

is was told 18 pounds by one person 22 by another? anyone know the actual stock boost #?

[AllMyBMsAreDoubleYous]

"[The turbos] provide a relatively conservative maximum boost pressure of just 18.9 psi."

source

[CaryTheLabelGuy]

It depends. The ZCP will target slightly higher boost pressures than the non-ZCP. Boost pressure targets depends greatly on ambient conditions.

The Non-ZCP will target no more than about 18# and the ZCP will target up-to 20#.

[PAWOLF]

I don't know why but my boost only shows 11.8 max.

[Sleeper]

Originally Posted by M4STERB8

I don't know why but my boost only shows 11.8 max.

328i?

What are you using to read boost/log? That doesn't make sense.

[mike@x-ph.com]

Originally Posted by F82TT

is was told 18 pounds by one person 22 by another? anyone know the actual stock boost #?

DME does not target PSI values but rather load values, which is why boost numbers will vary from 1 car to another depending on many factors.

[CaryTheLabelGuy]

Originally Posted by mike@x-ph.com

DME does not target PSI values but rather load values, which is why boost numbers will vary from 1 car to another depending on many factors.

The DME does actually have Boost Pressure targets, but it also uses load and torque targets as well and is very complex. There are a lot of tables for just boost/load/torque control, it's crazy.

[kerm1t]

Originally Posted by CaryTheLabelGuy

The DME does actually have Boost Pressure targets, but it also uses load and torque targets as well and is very complex. There are a lot of tables for just boost/load/torque control, it's crazy.

Could you give me some jnsite on why my zcp, dp, map1 is only giving me 21.8 on peak? Map 0 is showing me peak of 18psi

[SflBimmer8484]

Originally Posted by kerm1t

Could you give me some jnsite on why my zcp, dp, map1 is only giving me 21.8 on peak? Map 0 is showing me peak of 18psi

Depends where you are reading it from manifold or charge pipe. The charge pipe will show higher numbers because the throttle body is behind it which has a tendency to close. Manifold is what really matters.

[kerm1t]

Originally Posted by Andrew@ActiveAutowerke

Depends where you are reading it from manifold or charge pipe. The charge pipe will show higher numbers because the throttle body is behind it which has a tendency to close. Manifold is what really matters.

I'm reading it through the jb4 app. I guess I just have to take it to a dyno to see if I'm actually making any gains over a stock zcp

[SflBimmer8484]

Originally Posted by kerm1t

I'm reading it through the jb4 app. I guess I just have to take it to a dyno to see if I'm actually making any gains over a stock zcp

I believe that reads from the charge pipe so its a little higher than actual.

[whoop_ass]

Stock Boost at 5500 ft above sea level 91 Octane (15 F80)

http://www.datazap.me/u/whoopass/sto...3-4-6-29-34-36

I think at sea level it will be more.
The way that BMW engineers have mapped the boost curve is very linear
and tries to mimic a NA car.
you can see it has maxboost at 7k rpm.

I would love to see a stock ZCP log as I think they changed the way the ZCP comes onto boost.

anyone car to share.
CaryTheLabelGuy you got any stock logs of your car?