Boost numbers.

Polar Bear

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I drive conservatively 98% of the time but when I do get on it I’m not getting the PSI I think I should. Usually hit 13.9 to 14.7 PSI and it doesn’t hold long (10 speed?). Anyhow she goes faster than I really need and performs well. I’m not going to race or anything but I am wondering if I’ve got something robbing the power.... thoughts, and what numbers are those that measure seeing?

 

khyros

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15 PSI seems pretty good to me. Keep in mind that these are small turbos designed to minimize turbo lag as to drive as much like a naturally aspirated engine as possible. It's not a diesel or race-orientated turbo, where 40psi is what you'd expect to see. 15 PSI is basically doubling the amount of air you'd naturally get into the engine, making it equivalent to a 4.6L engine when you need that power.
 
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Polar Bear

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15 PSI seems pretty good to me. Keep in mind that these are small turbos designed to minimize turbo lag as to drive as much like a naturally aspirated engine as possible. It's not a diesel or race-orientated turbo, where 40psi is what you'd expect to see. 15 PSI is basically doubling the amount of air you'd naturally get into the engine, making it equivalent to a 4.6L engine when you need that power.
That's what I figured! I'm amazed at how much I can hear the 'swoosh' when I get on it so when I started measuring the numbers I thought they'd be bigger. I had a 1985 2.3 liter turbo Ford and this is a world of difference. No complaints seriously - still just learning the ecoboost.
 

HoosierT

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That's what I figured! I'm amazed at how much I can hear the 'swoosh' when I get on it so when I started measuring the numbers I thought they'd be bigger. I had a 1985 2.3 liter turbo Ford and this is a world of difference. No complaints seriously - still just learning the ecoboost.
Are you tuned? I failed to get boost numbers when I was still stock but with a tune, I see 22psi max. I would think you're right in the ball park for where you should be if you are stock/no tune.
 
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Polar Bear

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Are you tuned? I failed to get boost numbers when I was still stock but with a tune, I see 22psi max. I would think you're right in the ball park for where you should be if you are stock/no tune.
All stock minus the drop in filter and GFB DV+
 


HenryMac

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Where are you seeing the boost numbers? Is there a gauge?
 
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chuck stein

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Anything above 2PR (+14.696psi) for a OEM daily driver, without issues, is a good design.
OEM WRX's are about the same too.
2PR must be the max # they are willing to go within their warranty.

In general though, boosted engines will not live as long as NA engines. My Lexus NA v8 is approaching 250k miles w/o any signs of issue. But then again, maybe if you pussy-foot the gas all the time and turbo rarely spools up you can get 300k out of it?
 

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When I first got the SCT tuner, I hooked it up for the gauges and thought I saw the stock config boost numbers hit 22 psi - I had the GFB DV+ installed.
 

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Are your boost numbers the same between Drive and Sport modes?
 

berlow94

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Keep in mind that the wastegate on these engines is fully electronic. Unlike older ECU’s which have boost targets with physical coil springs installed in the wastegate for a specific PSI, the Ranger ECM varies boost based on a torque target.
With a certain throttle input the ECM will only build enough boost to hit its estimated torque target.

Say you put the truck on a dyno in a controlled pressure chamber. With all conditions being equal, the truck will generate more boost for a specific throttle input at a simulated 10k ft. of elevation than it will at simulated sea level. Same applies for hotter vs colder air temps and wetter vs dryer humidity levels.
 
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Polar Bear

Polar Bear

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Would you recommend the UltraGuage Blue?
I haven't tried that one. I did use the OBD Fusion app, which is similar, but I felt it was laggy. It may have jsut been my phone/ipad setup honestly. Msfitoy3.0 has a build journal that highlights the app. Worth a look!
 

 
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