Non-Sustained Boost - TiVCT or Boost Controller?

[99z28u_up]

I am new to FORD tuning and boost. With that being said, I experiencing a dip in boost during pulls. When I am tuning and making a pull 2800rpm - 7000rpm I can watch the boost drop inversely proportional to RPM. My question is can the VCT setting be used to build or sustain boost to Redline? Car made 619/629 on 93 Octane. I am wondering if something is wrong with the boost controller or if VCT is bleeding off pressure

2016 Mustang GT
On3 Twin 55mm Kit
Stock Block
7Psi
AEM TruBoost on 28% Duty Cycle

[Jn2]

I am new to FORD tuning and boost. With that being said, I experiencing a dip in boost during pulls. When I am tuning and making a pull 2800rpm - 7000rpm I can watch the boost drop inversely proportional to RPM. My question is can the VCT setting be used to build or sustain boost to Redline? Car made 619/629 on 93 Octane. I am wondering if something is wrong with the boost controller or if VCT is bleeding off pressure

2016 Mustang GT
On3 Twin 55mm Kit
Stock Block
7Psi
AEM TruBoost on 28% Duty Cycle

Boost is a measurement of restrictions, as you optimize VCT to take in more of the air the turbo's are putting out you will see manifold pressure go down. While you can play with VCT to bring manifold pressure up, you will just make less power in the end vs letting it draw in as much air as it can

[tbrtuning]

Are you saying you're losing boost based on the data reported by the ECU from your log or the boost GAUGE? Can't necessarily go by what Fords report for MAP. Those cars don't have MAP sensors.

[bbrooks98]

Check to see if your throttle is closing. VCT changes i don't see making boost fluctuate at 7psi, the turbo should have plenty of airflow left on the table to make up any ve differences.

[99z28u_up]

Are you saying you're losing boost based on the data reported by the ECU from your log or the boost GAUGE? Can't necessarily go by what Fords report for MAP. Those cars don't have MAP sensors.

The dyno and boost gage

[txcharlie]

I am new to FORD tuning and boost. With that being said, I experiencing a dip in boost during pulls. When I am tuning and making a pull 2800rpm - 7000rpm I can watch the boost drop inversely proportional to RPM. My question is can the VCT setting be used to build or sustain boost to Redline? Car made 619/629 on 93 Octane. I am wondering if something is wrong with the boost controller or if VCT is bleeding off pressure

2016 Mustang GT
On3 Twin 55mm Kit
Stock Block
7Psi
AEM TruBoost on 28% Duty Cycle

Yes, you can bleed off boost via VCT timing by creating overlap. It doesn't necessarily mean you are making less power.

[small tuner]

DO boost leak test first.

[tbrtuning]

I would try running wastegate only and see how flat it holds if your wastegate has a spring reasonable for your setup.

[99z28u_up]

Yes, you can bleed off boost via VCT timing by creating overlap. It doesn't necessarily mean you are making less power.

What boost controller are you using?

[99z28u_up]

Throttle not 100% or closing in this log?

[99z28u_up]

Can I get some help on the throttle body question?

[15PSI]

Can you post the tune so we can take a look at it? I am seeing over 600 lb/ft of IPC wheel torque errors during parts of your log. Have you verified that the waste gate/controller etc are sound and working properly?

[MRRPMBRP]

I'm not super versed in these just yet, still learning, but looks like throttle closing to me, take a look at your tach, goes red, then torque source says torque based decel, happens around 6100 or so. What is rev limit set at?

throttleclosing_for99z28.jpg

[bbrooks98]

Next time log Throttle angle and Throttle angle desired.

[txcharlie]

What boost controller are you using?

Running spring pressure at the moment.