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SVO Ryan
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Joined: 20/07/2009 01:07:28
Messages: 10
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How much boost should we be seeing?
I finally got my boost gauge hooked up and in the little bit of driving it seems as if 1/2nd gears its around 17 and 3rd it'll hit 20/21.
Is that about right?
I that I read a few years back that stock (pre-F37) they were pushing upwords of 26lbs?

Ryan
2005 Liberty CRD
GDE Tune//TransGo Shift Kit//PML Deep Pan//MBRP Exhaust//LoTek Dual Gauge Pod//ProSport Tranny Temp and Boost Gauges
1986 Mustang SVO
GreenDieselEngineering
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Joined: 10/07/2009 07:25:47
Messages: 371
Location: Southeast Michigan
Hello Ryan,

With the OEM calibration, you'll find that peak boost is a pressure ratio of 2.335 bar respective to atmosphere at 2200rpm. On a boost gauge, you would see: (2.335bar - 1 bar (atm) ) * 14.7 psi/bar = 19.6245psi. In a transient maneuver you might see it spike up higher quickly, but in steady state conditions 20psi would be the max. However, at RPM climbs above 2200rpm, the boost setpoint falls off quickly, and by 3800rpm you're down to a 2.24 pressure ratio / 18.228psi.

With the GDE Eco-performance tune and the turbocharger at maximum speed limits, we have a boost setpoint that holds a 2.4 pressure ratio / 20 psi all the way from 1800rpm to 3800rpm. However, the real change is in the normal driving range where you'll see an increase, in some areas, of 5-6psi or higher.

There was never any changes to the boost setpoint that would've had customers seeing 26psi on a boost gauge - if they were, it would've been in a transient maneuver where the closed-loop boost governing wasn't reacting fast enough and allowed for an overshoot of the boost setpoint (most likely in first gear during a WOT).
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SVO Ryan
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Joined: 20/07/2009 01:07:28
Messages: 10
Offline
What about in 'normal' driving? From what I think I know, I've heard some diesel tunes to minimize turbo lag will have ~2lbs of boost at idle. I 'see' 3-5lbs at idle/creeping conditions. I lean towards the gauge being bad or off. Can you provide any additional input?

Ryan
2005 Liberty CRD
GDE Tune//TransGo Shift Kit//PML Deep Pan//MBRP Exhaust//LoTek Dual Gauge Pod//ProSport Tranny Temp and Boost Gauges
1986 Mustang SVO
 
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