negative boost???
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More Turbo
Joined: Jul 2009
Posts: 705
Likes: 12
From: Taxachusetts
negative boost???
Hi all. towed for the 1st time this week with my "new" 04 6.0. very happy with its abilities towing a 5k tt from central mass to old orchard beach in maine.
my concern is the boost going up hills. the truck would do it fine, but after getting to 22ish psi on the sgII it would go to a negative 13. when it does, the truck will hold/very slightly lose speed even with more throttle input. also the vgt seems to be off from what it should be LI is 61 HI 2000 rpm is 47 IIRC.
do I need to clean the turbo? what is causing this?
my concern is the boost going up hills. the truck would do it fine, but after getting to 22ish psi on the sgII it would go to a negative 13. when it does, the truck will hold/very slightly lose speed even with more throttle input. also the vgt seems to be off from what it should be LI is 61 HI 2000 rpm is 47 IIRC.
do I need to clean the turbo? what is causing this?
Hotshot
Joined: Apr 2010
Posts: 19,055
Likes: 235
From: Saratoga Springs,UT
You need to program the Proper Boost Code into the SGII
this one below will stop it from going into negative reading
15.0 ‐‐ FF6A
And as far as Having a Boost Issue Post BARO & EBP & MAP at KOEO for a Start
this one below will stop it from going into negative reading
BST 07E0221440 046285140640 3010 01220320**** Boost (PSI). In order to get the proper boost value enter the MAP XGauge. Get a reading
from it with the key in the on position but the engine off. Based on the reading change
the last 4 digits of the MTH value that corresponds to your reading in the table to the
right.
14.0
from it with the key in the on position but the engine off. Based on the reading change
the last 4 digits of the MTH value that corresponds to your reading in the table to the
right.
14.0
‐‐ FF74
14.1 ‐‐ FF73
14.2 ‐‐ FF72
14.3 ‐‐ FF71
14.4 ‐‐ FF70
14.5 ‐‐ FF6F
14.6 ‐‐ FF6E
14.7 ‐‐ FF6D
14.8 ‐‐ FF6C
14.9 ‐‐ FF6B
14.1 ‐‐ FF73
14.2 ‐‐ FF72
14.3 ‐‐ FF71
14.4 ‐‐ FF70
14.5 ‐‐ FF6F
14.6 ‐‐ FF6E
14.7 ‐‐ FF6D
14.8 ‐‐ FF6C
14.9 ‐‐ FF6B
15.0 ‐‐ FF6A
And as far as Having a Boost Issue Post BARO & EBP & MAP at KOEO for a Start
I'm hitting easy street
Joined: Nov 2009
Posts: 6,395
Likes: 27
From: Central Oregon
Your VGT% isn't off that much.
KO=0 LI=73 HI=43 OR=0-100 %
A poll I did on this subject:
https://www.ford-trucks.com/forums/1...-hot-idle.html
KO=0 LI=73 HI=43 OR=0-100 %
A poll I did on this subject:
https://www.ford-trucks.com/forums/1...-hot-idle.html
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More Turbo
Joined: Jul 2009
Posts: 705
Likes: 12
From: Taxachusetts
bmp is 14.3, 14.3 bar, 14.5ebp, 14.5 map. adjusted the bst to read 14.3 and 14.5 still get negative #'s.
while I was messing with the SGII noticed the fml was running closer to 46-47 versus 48+. ficm starting to go?
AND my egr is LI @ 31 egv is 1, HI egr @ 45 egv will go up to 2. egv there is no decimal it's either 1 or 2???
wtf
while I was messing with the SGII noticed the fml was running closer to 46-47 versus 48+. ficm starting to go?
AND my egr is LI @ 31 egv is 1, HI egr @ 45 egv will go up to 2. egv there is no decimal it's either 1 or 2???
wtf
Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
04 has no factory boost gauge. I also don't recall boost having two decimal places but I have a manual boost gauge and don't use it on my SGII either. With the adjustment table Bennie supplied to you your MAP, BARO, and EBP should read +/- .5 psi of each other and boost should read zero. You can use any of the values listed for MAP from the table to adjust your boost. They don't have to be exactly the same as your MAP sensor. Check your Xgauge inputs as one place off can have drastic effects on proper readings.
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Hotshot
Joined: Apr 2010
Posts: 19,055
Likes: 235
From: Saratoga Springs,UT
04 has no factory boost gauge. I also don't recall boost having two decimal places but I have a manual boost gauge and don't use it on my SGII either. With the adjustment table Bennie supplied to you your MAP, BARO, and EBP should read +/- .5 psi of each other and boost should read zero. You can use any of the values listed for MAP from the table to adjust your boost. They don't have to be exactly the same as your MAP sensor. Check your Xgauge inputs as one place off can have drastic effects on proper readings.
I think this might be some of the problem^^^^and I dont fulley understand what he has done I guess
And Honestly you should take BARO Pressure Value and then use the corrasponding number on the Table to program Boost Gauge
Baro sets your basline
Like Tim is saying Take and program MAP & BARO & EBP check there values at KOEO should be within .5psi of each other at KOEO
do this^^^^^^^^^^^ First lets make shure you dont have a BAD MAP Sensor right off the Bat throwing a wrench in the Gears
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More Turbo
Joined: Jul 2009
Posts: 705
Likes: 12
From: Taxachusetts
Sorry, I meant factory on the SGII, not a factory boost on the truck.I have 2 differant boost readings on the the SGII. i miss placed the decimal should have been 0.2
Thanks for the patience, I'll check again tomorrow
Thanks for the patience, I'll check again tomorrow
Hotshot
Joined: Apr 2010
Posts: 19,055
Likes: 235
From: Saratoga Springs,UT
Its an X-Gauge
Hang on I will find ittt
BAR 07E0221442 046285140642 3010 001D00500000 Barometric Pressure (kPa(PSI)). Alternate to BMP
Key On = 96.5 (14)
Low Idle = 96.5 (14)
High Idle = 96.5 (14)
Operating Range = 50‐120 (7.3 ‐ 17.4)Key On = 96.5 (14)
Low Idle = 96.5 (14)
High Idle = 96.5 (14)
FTE Legend
Joined: Jul 2005
Posts: 65,938
Likes: 1,432
From: Millersville, MD
Thanks...don't know why I didn't have that X Gauge code on my list..... Now maybe I'll get rid of MY neg numbers in boost. Didn't really worry about it as I think the stock gauge is pretty good.
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More Turbo
Joined: Jul 2009
Posts: 705
Likes: 12
From: Taxachusetts
alright. ebp 14.2, bar 14.1, map 14.2, bst 0.0, bst 0.2, the 1st bst is the map or boost, the 2nd is the xgauge adjustable boost which I have set to 14.3 which is what map read last week.
suggestions or theories?
suggestions or theories?
Thread Starter
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More Turbo
Joined: Jul 2009
Posts: 705
Likes: 12
From: Taxachusetts
I changed the xgauge boost to agree with baro, i still get a negative boost when getting on it wheee! It's not as bad a - it goes to -10 vs -13. If the map sensor is good could sticking vgt cause - boost?? I cleaned the egr valve over the weekend it was nasty power coated black. I can only ASSuME the turbo is clogged up.
Lead Driver
Joined: Oct 2010
Posts: 5,420
Likes: 16
From: Ouray, CO
I changed the xgauge boost to agree with baro, i still get a negative boost when getting on it wheee! It's not as bad a - it goes to -10 vs -13. If the map sensor is good could sticking vgt cause - boost?? I cleaned the egr valve over the weekend it was nasty power coated black. I can only ASSuME the turbo is clogged up.
I get negative numbers at idle on certain days because the local
atmosphere has reduced the "normal" MAP reading by a small amount.
So, this normal and not an issue.
But, you are getting negative numbers under high-boost.
Monitor your MAP/EBP reading along with your BST, perhaps
the actual "pressure" sensor you are using to
calculate your boost is going "out of range" under high boost.
I'm not sure if BST is derived from MAP/EBP or something else.
Hopefully other's will chime in...