2gr84u

IVe noticed something interesting with my tru boost. Right now my car is tuned for about 15psi, so i have boost A as my setting that allows me to boost all the way to redline with no issue, now on this setting it will only do the max of 15 psi fairly high up in the rpms, now for kicks i set boost option B at a much higher level, and interestinly enough on this setting the car will easily reach max boost much earlier. Originally i though the wastegate spring pressure may have been the issue, but after testing it with different levels it makes no difference in this scenario. SO experts, whats the deal, any way to get my option A to perform the same way as the option B?

Kirpich

Ball bearing turbos spool up faster in general, compared to their size-brethren.

But if you reach full high boost late, then you'll obviously reach half that boost in half the time, right? I mean 8 psi will be easier to peak out at than 15 psi.

2gr84u

I believe you misread my post, im stating that peak boost is set for about 15 psi on option A, and is acheived fully only in higher RPMs, for option B ive set it much higher, and it is reaching 15psi much sooner, my question is why would one option boost quicker then the other

Revenge

I am intrested in this as well, could it be one of your settings is holding the wastegate shut longer so you achive full boost quicker? This is what I would like to try with my car. FYI, my gauge reads 1 psi lower than the dynopack I was tuned on, my AEM wide band reads 1 higher. There close but there not exact.

2gr84u

im sure it has everything to do with the wastegate staying closed, but asjusting the spring pressure on the wastegate does nothing to change this scenario, maybe its just a fluke in the design or somethign

Artisan7471

When you turn the duty cycle up on the Tru boost it will hold the waste gate shut for a little longer than a lower duty cycle. This should help the turbo spool quicker and develop boost sooner. However the quicker the turbo spools the greater the chance that it will overboost. As for the spring crack pressure, it is not actually the pressure that that the waste gate opens, rather the pressure above your wg spring rating that it will open. For example if you have a 5 lb spring and want to boost to 8 psi you would need to add 3lb's to this setting. In actuality you should add about 1 to 2 lbs less than your max boost, this will allow the system time to react so that you do not overshoot your desired boost level.

Revenge

So my car is set to 3.5 SP and button A 35 8.5psi and Button B is 46 9.5 psi, this was done by my tuner, if I want the car to boost faster what do I need to change. I have not messed with it yet I just want to understand first.

SgtB

The controller. The AEM isn't an intelligent controller. A controller like the b-spec adjusts the DC on the fly to maintain a quick spool and good boost control. You tell it what PSI you want, and it does most of the work for you. I find my truboost works good, but I'm upgrading to a better one.