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Old 04-10-2005, 05:11 AM   #1
Bill
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Question 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?
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Old 04-10-2005, 06:09 PM   #2
dosage0
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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
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Old 04-10-2005, 07:20 PM   #3
hippy
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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
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Old 04-10-2005, 10:35 PM   #4
Bill
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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....
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Old 04-11-2005, 12:48 AM   #5
eastcoastbumps
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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
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