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Author Topic:  2-3psi boost fluctuation at WOT  (Read 9100 times)

Offline CavVet5000

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2-3psi boost fluctuation at WOT
« on: September 27, 2016, 10:15:34 AM »
I'm wondering if it is normal for the boost to fluctuate 2-3psi at WOT... I will try and post a data
log screenshot of it. The Escape has 65k miles on it and runs good but I am wondering if this is normal or if I have a boost leak, or the factory diverter valve is leaking or what the deal is. Thanks in advance for the assistance!

[img]https://www.flickr.com/photos/143433145@N06/shares/hn8S81[/img
2013 Deep Impact Blue Escape Titanium, 2.0 EcoBoost bone stock with 65k on the clock.

Offline SHOdded

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Re: 2-3psi boost fluctuation at WOT
« Reply #1 on: September 27, 2016, 10:23:20 AM »
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Offline AJP turbo

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Re: 2-3psi boost fluctuation at WOT
« Reply #2 on: September 27, 2016, 10:39:25 AM »
If you look closer you might be surprised what your car does...do a 3rd gear sweep from 2000 rpm and you might see more than 5 psi....instead od looking at boost you should be looking at desired tip to see what the car wants to target
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Offline CavVet5000

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Re: 2-3psi boost fluctuation at WOT
« Reply #3 on: September 27, 2016, 11:57:18 AM »
This is a 3rd gear pull from about 3k rpm, the blue line is actual tip in KpA and the green line is desired tip.

« Last Edit: September 27, 2016, 12:21:04 PM by CavVet5000 »
2013 Deep Impact Blue Escape Titanium, 2.0 EcoBoost bone stock with 65k on the clock.

Offline AnotherGreenFusion

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Re: 2-3psi boost fluctuation at WOT
« Reply #4 on: September 27, 2016, 12:01:20 PM »
Pic is broken?


 
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Offline CavVet5000

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Re: 2-3psi boost fluctuation at WOT
« Reply #5 on: September 27, 2016, 12:04:33 PM »
Forgot to make it public, should work now.
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Offline AnotherGreenFusion

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Re: 2-3psi boost fluctuation at WOT
« Reply #6 on: September 27, 2016, 12:32:42 PM »
The fluctuation in the boost is normal. Tuned or stock?


A lot of tunes I have seen max the desired boost all the way across the band.
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Offline AJP turbo

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Re: 2-3psi boost fluctuation at WOT
« Reply #7 on: September 27, 2016, 12:33:36 PM »
See what I mean...Yours looks like its following desired well...
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Offline CavVet5000

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Re: 2-3psi boost fluctuation at WOT
« Reply #8 on: September 27, 2016, 12:38:31 PM »
Thanks for the insight  :cheers: but is it normal for the actual boost line to be so choppy?
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Offline CavVet5000

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Re: 2-3psi boost fluctuation at WOT
« Reply #9 on: September 27, 2016, 12:40:08 PM »
The fluctuation in the boost is normal. Tuned or stock?


A lot of tunes I have seen max the desired boost all the way across the band.

It is 100% stock
2013 Deep Impact Blue Escape Titanium, 2.0 EcoBoost bone stock with 65k on the clock.

Offline ZSHO

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Re: 2-3psi boost fluctuation at WOT
« Reply #10 on: September 27, 2016, 01:04:21 PM »
CavVet5000 due setup a INTRO for yourself simply by following this link and add your signature with your current vehicle and any mods that you may have so we can assist you better,thanks  Z   http://www.ecoboostperformanceforum.com/index.php/board,14.0.html
« Last Edit: September 27, 2016, 01:09:56 PM by ZSHO »


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Offline AnotherGreenFusion

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Re: 2-3psi boost fluctuation at WOT
« Reply #11 on: September 27, 2016, 01:17:50 PM »
Thanks for the insight  :cheers: but is it normal for the actual boost line to be so choppy?


yup normal, you are watching the ECU try to keep the boost at the desired level by messing with the throttle plate and wastegate IIRC. Mine has always done this. You can compare to logs others have posted here too.
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Offline AJP turbo

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Re: 2-3psi boost fluctuation at WOT
« Reply #12 on: September 27, 2016, 03:04:13 PM »
Honestly, boost is somewhat irrelevant....its a hard adaptation to make but if you get hung up on looking at boost you will thing there is soemthing wrong

The ecoboost cars are targeting torque levels..it will do whatever is necessary to achieve that torque so boost will be all over the place

I tune for boost because its what i like and what im comfortable with and thats how most people prefer it too...

I can tune either way for people but in the low end and midrange you dont need as much boost for s given torque level so boost goes down and people think something is wrong
SCT Dealer/Custom Calibrator                        
Specializing in 3.5 Ecoboost   
Remote/email custom tuning including E85 blends 
Authorized retailer for all SCT devices. 
 
Former:2014 PP SHO
3 bar 93 tune, Airaid, Stainless Works non catted DP's  
405whp/520tq
Dyno
      
Current:2016 F150 2.7 Ecoboost
Tuning in progress

 


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