quick spool/ activation pressure

[dogmoo]

aren't they essentially the same thing just that one can be mapped to gears.

[crluver123]

Activation pressure is when the solenoid starts to operate. Below the activation pressure the solenoid is completely disabled. This is to keep it from being used except when necessary in order to extend the life of the solenoid.
Quick spool pressure is to clamp the wg shut so the turbo spools as fast as possible. When quick spool is set higher than activation pressure, the solenoid runs 100% duty cycle up to the quick spool setting, then operates normally. If quick spool is set lower than activation pressure it disables quick spool

[dogmoo]

Right.... so they do the same thing

[crluver123]

no, not the same thing at all. exact opposite from each other in fact.
below activation pressure, the solenoid is not energized at all, gets zero signal, meaning it operates on wg pressure, aka 0% duty cycle.
below quick spool pressure, the solenoid is fully energized, 100% duty cycle, aka maximum pressure to the wg to clamp the wg shut so it can't creep open during spool up.

[dogmoo]

That depends on the state of your solenoid then. My Macs for whatever reason is normally closed at rest. So until activation pressure or quick spool is turned on it's in the same state.


But I see now how if the wastegate is normally open they would serve different functions. Thanks

[crluver123]

you're not understanding. that's fine. I'll say it again. Below activation pressure, the solenoid gets zero power, aka a true 0% duty cycle. If quick spool is set lower than activation pressure, then after activation pressure is achieved, the solenoid does whatever is programmed in the boost control tab. But If quick spool is set higher than activation pressure, then the solenoid still gets zero power (0% duty cycle) below activation pressure, but 100% duty cycle ABOVE activation pressure and BELOW quick spool pressure. Then after quick spool pressure is reached, the solenoid will do whatever you program it to do in the boost control tab.

Do you understand the difference between 0% duty cycle and 100% duty cycle?

[blacksi76]

Interesting topic, I've played with the quick spool feature and for whatever reason I always overboost in every gear, like it's very sensitive as to what to set the values in the quick spool box to get it right.

[crluver123]

Interesting topic, I've played with the quick spool feature and for whatever reason I always overboost in every gear, like it's very sensitive as to what to set the values in the quick spool box to get it right.

sometimes that's due to the throttle position compensation for boost control. or sometimes it's just because you're setting the spool too high. usually if I use the spool feature I set it only a little bit above wastegate spring pressure, and let the regular boost control settings take over from there.

[jaygeezemail]

Interesting topic, I've played with the quick spool feature and for whatever reason I always overboost in every gear, like it's very sensitive as to what to set the values in the quick spool box to get it right.

Yes. It's sensitive. Once the turbo spools there are no "brakes" on it. My boost cut is set at 11.5lbs quick spool at 4.5lbs. Duty cycle at 49% it spools up to 10.8 then vtec kicks in and drops about a pound and stays about 10ish. If I set the quick spool at 5lbs. It'll over boost.