UTEC closed loop boost

Bill · 04-10-2005, 05:11 AM

Anybody figure out whether the closed loop boost control was linear? I want to ramp up my boost as I transition from ECU to UTEC control. I would also like to put reasonable values in the parts of the map that are difficult to actually get to on the street. Hopefully, it is something like adding 25 to the map adds another psi of boost. Or at least can you do a ratio of map number to psi and come up with a psi per whatever those map values are?

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dosage0 · 04-10-2005, 06:09 PM

Quote:

Originally Posted by Bill

Anybody figure out whether the closed loop boost control was linear? I want to ramp up my boost as I transition from ECU to UTEC control. I would also like to put reasonable values in the parts of the map that are difficult to actually get to on the street. Hopefully, it is something like adding 25 to the map adds another psi of boost. Or at least can you do a ratio of map number to psi and come up with a psi per whatever those map values are?

its not linear. Up it by 20-30 per pull and get it to where you want, but there is no formula

hippy · 04-10-2005, 07:20 PM

Since the threashold for closed->open loop fueling is throttle position and not boost, you will never know what the boost will be when transitioning, and will not be able to transition the boost smoothly between them. Course, the boost at part throttle and during transition is usually below wastegate pressure, so even if you could determine what the boost would be while transitioning, you probably wouldn't be able to control it.

peace

Bill · 04-10-2005, 10:35 PM

Quote:

Originally Posted by dosage0

its not linear. Up it by 20-30 per pull and get it to where you want, but there is no formula

Well unless there is a little man in there controlling the waste gate based on what he feels is right, there has to be an equation(s). The fact that TurboXS is annoying customers by not telling us what it is a rant for another time. Meanwhile, wish me luck in getting a smooth road race tune....

eastcoastbumps · 04-11-2005, 12:48 AM

The equation (if there even was one) would have far too many variables to be accurate. PM me if you have problems tuning your boost map. I'm local and I might be able to help you out.

Pete

04-10-2005, 05:11 AM	#1
Bill Scooby Newbie Member#: 5081 Join Date: Mar 2001 Chapter/Region: NESIC Location: Clinton, MA Vehicle: 2010 STI Dark Grey	UTEC closed loop boost Anybody figure out whether the closed loop boost control was linear? I want to ramp up my boost as I transition from ECU to UTEC control. I would also like to put reasonable values in the parts of the map that are difficult to actually get to on the street. Hopefully, it is something like adding 25 to the map adds another psi of boost. Or at least can you do a ratio of map number to psi and come up with a psi per whatever those map values are? * Registered users of the site do not see these ads.

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04-10-2005, 07:20 PM	#3
hippy Scooby Specialist Member#: 36528 Join Date: May 2003 Location: florida Vehicle: 2002 Impreza Wrx Silver	Since the threashold for closed->open loop fueling is throttle position and not boost, you will never know what the boost will be when transitioning, and will not be able to transition the boost smoothly between them. Course, the boost at part throttle and during transition is usually below wastegate pressure, so even if you could determine what the boost would be while transitioning, you probably wouldn't be able to control it. peace

04-11-2005, 12:48 AM	#5
eastcoastbumps Scooby Guru Member#: 29201 Join Date: Nov 2002 Chapter/Region: NESIC Location: Shrewsbury, MA Vehicle: BMW M3 Honda S2000x2	The equation (if there even was one) would have far too many variables to be accurate. PM me if you have problems tuning your boost map. I'm local and I might be able to help you out. Pete