jprice@CPS

You're going down the right line.. read my reply also.

jprice@CPS

What happens when you get more boost than requested? For my DBW car, I get throttle cut.. do you just keep going?

I'd be a little scared turning up the boost on nDBW car without having some sort of control with the fueling in case it's needed. (for DBW cars, lemmiwinks sure comes in handy for this!) Just log and make sure your A/F isn't getting whacky! When you turn up the boost, do it in slow increments, clear codes, then log blocks 001.. and after driving for a while, check block 032 for ltft.

jprice@CPS

Should have mentioned, TCD on MAP wires for DBW cars.

Digit@lex

I believe it can keep going which we know is bad since it can lean out. I don't think that's the case (I hope).

I wanted it so I can turn the boost down.

Thanks for the VAG block recommendations. With the MBC in parallel and set to ~21psi (I can spike to ~23) my LTFT was around -7% IIRC.

Digit@lex

I believe Angry Alex is trying to implement that TCD.

jprice@CPS

Are you going to turn up the boost? with -7%, i'd think you have a little room without needing more fuel.

xr4tic

More boost or faster response or both?

In series w/MBC first:
set the MBC below the N75 boost value, this will quicken response, and the N75 will still control the boost. If the boost is strong in the mid range, but tapers off in the upper RPM, set the MBC higher to keep it from tapering off.

in series w/MBC second:
Blown motor?
The N75 is a bleed valve, so the pressure going into the MBC will not be enough to open the MBC. I think if you set the MBC to whatever the wastegate is set for, you can avoid "wastegate creep" (where the wastegate starts to slowly open before it's boost setpoint) for faster response, but it will have no affect on peak boost.

in parallel:
Under the MBC setpoint, the N75 will control boost, and over the MBC setpoint, the MBC will control the boost.
If the MBC is set below the N75 value, it will have absolutely no affect.
This might have the affect of controlling boost spikes, but response will be the same as just having an N75. The MBC should be set to your desired boost point, but you're still at the mercy of the ECU.

Digit@lex

1) Eliminate boost spikes.

2) Achieve a faster response.

I figure I can't have both without some compromise. I wanted to see which consequence I can deal with more.

Digit@lex

I pull back up to 8 or 9 degrees with just the N75. With the boost controller set at that PSI range I was retarding at 10 degrees. This is with 93 in the tank and 60 degree weather.

I want to dial down the boost and see what effect it would have on the timing retard.

Gldnrkt(GT3076R)

Right here buddy!! works like a charm!!