It is currently Sun Oct 05, 2025 1:31 am

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 5 posts ] 
Author Message
 Post subject: Proper map sensor readings
PostPosted: Tue Jul 20, 2021 5:58 pm 
Offline
LOST Newbie

Joined: Sat Mar 14, 2020 1:13 pm
Posts: 26
Location: PDX
Been chasing a p0299 for a lil bit now and it’s really starting to piss me off. Ive retraced my steps a bit and looked at the freeze frame data of the p0299 and the map reading showed 49inhg. That’s seems a bit high but The brief time I searched online I couldn’t find the right value. I never replaced my map sensor With a new one when my turbo issues started I just swapped the one that was on my blown motor… after swapping the “new” sensor on the freeze frame for the p0299 shower 48in hg. I cleaned both sensors somewhat recently and there’s nothing caked on plus car is deleted. What’s is the proper value? Thanks!!!

_________________
'05 kj CRD Limited 160k on body 85k on engine, 2.5" lift, JBA arms, OME springs, Bilstein 5100 front, skyjacker blackmax rear, Spider spacers, toyo a/t 245 75s, all suspension and steering components new, sasquatch turbo, EGR delete, 5v bosch plugs, @Libby.PDX on Instagram!


Last edited by mr.jerryfluffy on Tue Jul 20, 2021 8:44 pm, edited 1 time in total.

Top
 Profile  
 
 Post subject: Re: Proper map sensor readings
PostPosted: Tue Jul 20, 2021 6:06 pm 
Offline
LOST Newbie

Joined: Sat Mar 14, 2020 1:13 pm
Posts: 26
Location: PDX
Elevation for my city is about 497 feet above sea level if that makes a big difference

_________________
'05 kj CRD Limited 160k on body 85k on engine, 2.5" lift, JBA arms, OME springs, Bilstein 5100 front, skyjacker blackmax rear, Spider spacers, toyo a/t 245 75s, all suspension and steering components new, sasquatch turbo, EGR delete, 5v bosch plugs, @Libby.PDX on Instagram!


Top
 Profile  
 
 Post subject: Re: Proper map sensor readings
PostPosted: Wed Jul 21, 2021 9:53 am 
Offline
LOST Member

Joined: Tue Dec 08, 2015 10:46 am
Posts: 182
Not knowing at what load the engine was at when you captured 49"Hg pressure makes the answer to your question difficult. Keep in mind that the reading is in absolute pressure, which includes the 29.92"Hg atmospheric pressure. So, your captured reading is only 19" of boost, which is completely plausible, but varies depending on load. I am at about the same elevation as you and both of my CRD's will see above 60" under hard acceleration. So, I do not believe your reading is "high".

_________________
2006 KJ Sport CRD, 2006 KJ LTD CRD, 2013 Subaru BRZ 6spd., 1994 Ford F150 XLT, 1969 Dodge Charger R/T 4spd. (Yes it's a Hemi).


Top
 Profile  
 
 Post subject: Re: Proper map sensor readings
PostPosted: Wed Jul 21, 2021 1:11 pm 
Offline
Moderator
Moderator
User avatar

Joined: Sat Aug 24, 2013 11:36 pm
Posts: 7365
Location: Central GA
mrhemi wrote:
Not knowing at what load the engine was at when you captured 49"Hg pressure makes the answer to your question difficult. Keep in mind that the reading is in absolute pressure, which includes the 29.92"Hg atmospheric pressure. So, your captured reading is only 19" of boost, which is completely plausible, but varies depending on load. I am at about the same elevation as you and both of my CRD's will see above 60" under hard acceleration. So, I do not believe your reading is "high".

Agree, engine load factor would be most helpful.
compensating for elevation difference, 49"inhg @ his 497' elevation = 23.77psia
still a most believable and good number if taken at full load operation.

_________________
Supporting Vendor and Moderator of LOST
05 Jeep Liberty CRD Limited :JEEPIN:
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount

98 Dodge Cummins 24 Valve


Top
 Profile  
 
 Post subject: Re: Proper map sensor readings
PostPosted: Thu Jul 22, 2021 12:06 pm 
Offline
LOST Newbie

Joined: Sat Mar 14, 2020 1:13 pm
Posts: 26
Location: PDX
WWDiesel wrote:
mrhemi wrote:
Not knowing at what load the engine was at when you captured 49"Hg pressure makes the answer to your question difficult. Keep in mind that the reading is in absolute pressure, which includes the 29.92"Hg atmospheric pressure. So, your captured reading is only 19" of boost, which is completely plausible, but varies depending on load. I am at about the same elevation as you and both of my CRD's will see above 60" under hard acceleration. So, I do not believe your reading is "high".

Agree, engine load factor would be most helpful.
compensating for elevation difference, 49"inhg @ his 497' elevation = 23.77psia
still a most believable and good number if taken at full load operation.


Ok I agree I looked up my air pressure to be 30, I’m also very positive that it’s at max boost because I can feel just a bit of extra lag at 50 mph. Freeze frame data showed it kicked on at 2k rpm which is consistent to the gauge at that speed. Once i floor the throttle the turbo finally gives me the extra boost I need to hit 60-80+ I’ve been reading the forums everyday and this one seemed strikingly similar to my issue: viewtopic.php?f=5&t=86734&start=40

I think I’m gonna just try retuning the car i guess fingers double crossed. Just double checking I don’t need any extra mods to run nicks stage 2 hot 811 tune? Tranny was fixed with sun coast or euro tc a long time ago.

_________________
'05 kj CRD Limited 160k on body 85k on engine, 2.5" lift, JBA arms, OME springs, Bilstein 5100 front, skyjacker blackmax rear, Spider spacers, toyo a/t 245 75s, all suspension and steering components new, sasquatch turbo, EGR delete, 5v bosch plugs, @Libby.PDX on Instagram!


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 5 posts ] 

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 30 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group. Color scheme by ColorizeIt!
Logo by pixeldecals.com