Engine Management eCtune , Crome , AFC , FMU , Zdyne , Hondata , EMS , TE , Uberdata Anything to control your fuel, spark needs!

Bar map sensor question

Old 06-29-2005, 04:02 PM
  #1  
0.0 BAR
Thread Starter
 
Join Date: Jun 2005
Location: WA
Posts: 0
Default Bar map sensor question

im sorry if this has been covered already, if it has can someone just give me the link?

ive read all the newbie threads and im still confused on what a bar map sensor is. i know there are 1, 2, and 3 bar map sensors, but thats about it. what do they do, or what is their purpose. i would appreciate it if someone can help me. thx.
Oscar is offline  
Old 06-29-2005, 04:21 PM
  #2  
3.0 BAR
 
Join Date: Sep 2003
Posts: 3,751
Default Re: Bar map sensor question

Bar is the amount of pressure.
1bar~14.7 PSIa

a 1 bar can only read 14.7 psia or 0psi boost
a 1.8 bar (stock honda) can read .8 bar 11.76 psi of boost
a 2 bar can read 14.7
a 3 bar can read up to 29.4
a 4 bar and so on.

Get it?
For a stock honda staying around 0-12psi of boost, a stock one is fine.
bumblezc is offline  
Old 06-29-2005, 04:34 PM
  #3  
0.0 BAR
Thread Starter
 
Join Date: Jun 2005
Location: WA
Posts: 0
Default Re: Bar map sensor question

o, ok. so the bar map sensors are just so it can read higher boost? like the stock one can only read 0, and 1.8 =14.7 and so on.

k got that. but what happens if i run like 15 psi, on a stock bar map?
Oscar is offline  
Old 06-30-2005, 12:51 AM
  #4  
3.0 BAR
 
Join Date: May 2004
Posts: 5,049
Default Re: Bar map sensor question

Originally Posted by jdmcord
k got that. but what happens if i run like 15 psi, on a stock bar map?
You get CEL's Because the ECU will think something is going wrong or the sensor is malfunctioning.
Cray91 is offline  
Old 06-30-2005, 05:28 AM
  #5  
0.0 BAR
 
Join Date: Feb 2003
Posts: 0
Default Re: Bar map sensor question

Originally Posted by bumblezc
Bar is the amount of pressure.
1bar~14.7 PSIa

a 1 bar can only read 14.7 psia or 0psi boost
a 1.8 bar (stock honda) can read .8 bar 11.76 psi of boost
a 2 bar can read 14.7
a 3 bar can read up to 29.4
a 4 bar and so on.

Get it?
For a stock honda staying around 0-12psi of boost, a stock one is fine.
No.

1 bar is 14.5 psi. That 14.7 ---- is called atmospheric pressure, which is something different.

Stock Honduh MAP sensor can at no time read as much boost as you claim. Honduh MAP 85-91 reads 9.25 psi, 92-until reads 10.65 psi. Hyundaidata claims 11.3, when questioned Dougie said they read all over the place, but all I've seen is a consistent 10.6x psi limit.

Lets compond the situation and bring into discussion quality control and calibration.... stock Honduh MAP sensors are pretty well calibrated from the factory. GM 3 bar, for example, have a +/- 3% variance from "ideal," which means your GM 3 bar can read as low as 26 psi before maxing out and as high as 32 psi. Welcome to miscegenated GM garbage, and the reason why you always retune when switching GM junk sensors...

Originally Posted by Cray91
Originally Posted by jdmcord
k got that. but what happens if i run like 15 psi, on a stock bar map?
You get CEL's Because the ECU will think something is going wrong or the sensor is malfunctioning.
With stock ECU? Sure. You'll hit limp homo mode long before you hit past what the MAP sensor can read, much less 15 psi. Now, try to run 15 psi on stock MAP sensor with an ECU running boost code - depending on the MAP sensor you're running, the ECU thinks you're running 9.25-10.65 psi. Welcome to too little fuel, too much ignition.

Boost cut is your speshul friend!
Tom-Guy is offline  
Old 06-30-2005, 11:44 AM
  #6  
3.0 BAR
 
Join Date: Sep 2003
Posts: 3,751
Default Re: Bar map sensor question

Oh, sorry your right 14.5 is 1 bar, I just finished writing a Thermodynamic midterm so that threw me off.
bumblezc is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
jarebear667
Turbo Parts For Sale
4
06-27-2008 02:18 PM
0b00st0
Engine Management
85
07-17-2007 06:33 AM
myshtern
Engine Management
12
10-28-2005 01:36 PM
needahonda
General Discussion
3
08-29-2005 05:57 PM


Thread Tools
Search this Thread
Quick Reply: Bar map sensor question


Contact Us - Sitemap - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.