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 Old 10-30-2012, 07:22 AM   #1
 
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Default How-To: Painless 3 BAR MAP Sensor upgrade

Your MAP sensor is what the ECU uses to read boost pressure. The stock Manifold Absolute Pressure sensor (MAP) is a 2.5 BAR unit, which tops out around 23-24psi, and looses accuracy around 22-23psi. If you want to accurately see pressures in that range or over, regardless of BT or K04, it's a wise idea to upgrade to at least a 3 BAR sensor. This is important even if you want to run boost pressures around 19-20psi, since the throttle cut and fuel cut settings will be at or beyond the point in the stock sensor range where things get fuzzy, so they may not work consistently, work as expected, or even work at all.

In the past this meant trying to find an overpriced sensor,usually in the range of $90-$125, and then having to cut the OEM plug off and solder the wires for the correct plug. There was a premium price since the MAP used by Mazda not only reads boost pressure, but has a built in Temp sensor, which even now, years later, is a nice touch, and fairly unusual in the USA.

Frankly, it was both expensive & a PITA, and that kept many people from making a very intelligent upgrade.

NO MORE-


3 BAR MAP + PNP Harness
no soldering, plug n play, completely reversible to stock, and can be re-sold later as a kit if you stock out.
Under $100 for everything!

Ballenger Motorsports
Bosch 3 BAR MAP with Temp - $29.99
their PN SNSR-03085
Bosch # 0 281 002 845
Home » Shop » Sensors » Pressure Sensors » Bosch 3 Bar TMap Map Sensor with IAT


Plug-n-Play Mazdaspeed MAP Harness - $60 shipped
The OEM Mazda MAP sensor uses a proprietary connector. This harness will convert that connector into a more standard Bosch connector for use with a wider range of MAP sensors.
Mazdaspeed MAP Harness - Bitwise Motorsports


Corrections to the tune must be made!
For ATR (not sure if VT is same terminology)
If you run the HT, you're out of luck...


-> Bring the laptop to your car, fire up ATR and connect it through your AP to the ECU. Through the View menu, set Dashboard so you can view Boost. Dashboard gauges can be set through Options>Gauge List. With the Key On & Engine Off (KOEO) note what it reads for boost. Mine read -0.16. on the stock MAP sensor. You're going to want to end up with your KOEO boost as close to 0 as you can get.

For the 845 MAP sensor, you need to change three sets of MAP Scaler tables, found in the Sensor Cal folder. These are all those other tables in the same place as where you make the MAF Cal changes.

Three sets of tables, EM, Log & OBD, make the same changes in all three set, 9 individual tables.



=========================
UPDATE: Much of the remainder of this post is dedicated to finding the best values to enter in the Offset table. While this manual process still works as well as ever there is also a new set of values which have been in use for months now and have proven to be consistent & accurate. Later in this thread @rfinkle2; shares the math he used to define these numbers, and they've worked well across the country. You can feel free to just use these and know you're probably going to be more accurate than the original values were with the stock MAP sensor...

Scalar A - 296
Scalar B - 0.22
Offset - 5.444

Thanks Rob! Working magic like always!
=========================

-=> The original method:
Scalar A - 65.78
Scalar B - 1
Offset - will end up somewhere between 8.35 to 5.44

The Offset is the one that you need to change to find which value gets you closest to 0. After testing the three most common, I ended up using 6.00. Those three common used reference values are 5.44, 6.50 & 8.35.

Below are the values I found.
oem: -0.16
5.44: +0.06
6.50: -0.08
8.35: -0.37
6.00: -0.01 <--- Where I ended up after testing the common values

Here's an example of the dashboard boost gauge when I had the 5.44 scaler loaded-
*remember, key on, engine off*


These settings are also discussed in the ATR Help File. You've read the help file, right? (stern look.....)


So, start by getting the stock KOEO Boost reading so you have a baseline, then go ahead & swap the map sensor. Next load a map with updated scaler & offset values and check the KOEO Boost. Since it's doubtful you'll be close to 0 with this first revision change just the three offset tables to another of the three baseline values, flash the map, check the KOEO Boost again.

Repeat till you determine what offset gets you closest to 0. The offset value needed seems to be slightly different from car to car. It only takes a few moments to make the offset changes & flash the map, so go ahead & try all three common values to get a feel for how they change the KOEO boost reading. You want a offset value that gets you close to 0.

The three common used reference offset values again: 5.44, 6.50 & 8.35, and you may well end up using an offset value of your own like I did. I used a offset value of 6.00 to get a KOEO Boost reading of -0.01.

All told, it took me ~30-40 minutes from on ramps (to save my back) to off ramps & test drive, including testing the four different versions of offset listed above, to complete this project.

Once your set you'll have a accurate boost readings up to about 30psi. If you're feeling particularly froggy, they make a 3.5 BAR, even a 4 BAR....
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Last edited by TiGraySpeed6; 10-31-2014 at 03:39 PM.
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 Old 11-01-2012, 06:30 AM   #2
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I need to order one! I can't PM anyone yet =X Please PM me?
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 Old 11-01-2012, 06:59 AM   #3
 
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Who- Me??

I'm not selling anything- There are links up there for both the plug n play harness adapter and for a great deal on the MAP sensor that will take you right to the vendor - easy peasy
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 Old 11-01-2012, 07:02 AM   #4
 
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Glad I saw this. Now I understand a little more about what's available. Great write up. @sassyspeed3 installed my 3 bar last night and thanks to @rfinkle2 for continuing to tune me. I need to catch up with the wife. No way will I let my own wife make more power than me lol

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 Old 11-01-2012, 07:30 AM   #5
 
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For those who are tuning with VersaTuner this is the section that you need to look at:



The MAP Scale Additive corresponds to the Offset value above, MAP Scale Base Multiplier is the Scalar A and the MAP Scale Second Multiplier is the Scalar B.
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 Old 11-01-2012, 07:46 AM   #6
 
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@Pseud0logik @dshrek
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 Old 04-27-2013, 12:18 PM   #7
 
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Default Awesome!

Thanks a lot for this write up, I just came from my tuner's shop on a mission to find an upgrade to the stock MAP sensor, as I'm having issues running boost levels over 21psi, and I didn't want to splice wires or anything like that. You have saved me time and money!
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 Old 04-27-2013, 02:00 PM   #8
 
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Originally Posted by guerrero1977 View Post
Thanks a lot for this write up, I just came from my tuner's shop on a mission to find an upgrade to the stock MAP sensor, as I'm having issues running boost levels over 21psi, and I didn't want to splice wires or anything like that. You have saved me time and money!
way to revive an old ass thread
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 Old 04-27-2013, 04:22 PM   #9
 
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relevant now as the day it was drafted.

Glad it was of assistance!
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 Old 05-03-2013, 08:47 AM   #10
 
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Originally Posted by TiGraySpeed6 View Post
relevant now as the day it was drafted.

Glad it was of assistance!
You're damn right about that! My stock sensor was no good for the hp I'm hitting right now, around 450hp. Now I should be able to get it tuned properly and hit 500hp.
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 Old 06-02-2013, 11:49 AM   #11
 
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Thank you. I'm getting a 3.5 BAR soon for the gtx3071. I plain on running around 30psi. as fuel will permit anyway. Tuning this shouldn't be hard at all.
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 Old 06-02-2013, 01:20 PM   #12
 
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You'll want different settings for a 3.5 BAR-

These are from the ATR Help File:

Bosch #: 0 281 002 456
Scaler A: 75
Scaler B: 1
Offset: -12.5 as a starting point (that's negative 12.5)


note that you will most likely still need to tinker with the offset to get your car as close to KOEO boost pressure of zero as possible, and be sure to use the Dashboard function- the AP is nowhere near as accurate
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 Old 06-02-2013, 01:29 PM   #13
 
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Thank you sir.
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 Old 06-15-2013, 09:25 AM   #14
 
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Can i use this sensor with the plug n play harness?
Does this unit has the temp. Sensor included?

Bosch 0 281 002 437
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 Old 06-15-2013, 09:45 AM   #15
 
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Originally Posted by stonecold0469 View Post
Can i use this sensor with the plug n play harness?
Does this unit has the temp. Sensor included?

Bosch 0 281 002 437
I believe so...iirc correctly there are 2 3bar sensors out there...and the 437 will require a different calibration.
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 Old 06-15-2013, 09:48 AM   #16
 
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Will the pigtail fit this one?
I will try this soon. I want 25 psi on my precision!!!
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 Old 07-02-2013, 05:00 AM   #17
 
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Just ordered mine... =) Moar Booost...
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 Old 07-14-2013, 09:21 PM   #18
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Thanks for the write up. Just bought the 3 BAR MAP sensor to finish my BT build. Will be installing tomorrow
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 Old 07-27-2013, 08:51 PM   #19
 
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anyone know if you can use more than 5.44, 6,0, 6.5, and 8.35? Like for example can I set the offset for 6.65?
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 Old 07-28-2013, 09:56 AM   #20
 
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Yes, you can, and you're encouraged to find the value that brings you closest to KOEO 0.00 boost pressure.

nothing wrong at all with using the offset of 6.65
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 Old 08-02-2013, 11:42 AM   #21
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Thanks again for the write up. Very helpful!! I ended up with a 5.7 offset to get a -0.03.
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 Old 08-02-2013, 01:30 PM   #22
 
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Going to try this. Thanks for the links.
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 Old 08-09-2013, 10:12 PM   #23
 
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MAP swap = EGR delete?
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 Old 08-09-2013, 10:44 PM   #24
 
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That looks nice ferd.
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 Old 08-09-2013, 11:08 PM   #25
 
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I really need to find a place where I can run a bottle if seafoam up the brake line. I don't have the nerve to do it at my house.
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 Old 08-10-2013, 07:59 AM   #26
 
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Originally Posted by Ferdball View Post
I really need to find a place where I can run a bottle if seafoam up the brake line. I don't have the nerve to do it at my house.
Find a random parking lot in the next town over....
tastysi2004 likes this.
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 Old 08-20-2013, 06:51 PM   #27
 
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for some reason my map voltage never goes above 1.01v. Last log i done it ranged from .11v to 1.01v. I have to have something off? I used:

A - 65.78
B - 1
Offset - 6.6

6.6 will read -.06 KOEO.
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 Old 08-21-2013, 07:47 AM   #28
 
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Does the boost psi read accurately? That's the key question, and can be answered by comparing logs from just before and just after your install and configuration of the MAP sensor.

As for MAP Voltage- that's not something the AP logs.
Are you thinking of MAF Voltage?

Do you have a log of this behavior you could post?
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 Old 08-21-2013, 01:31 PM   #29
 
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my AP monitors MAP voltage?
Attached Files
File Type: csv datalog38.csv (10.8 KB, 33 views)
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 Old 08-21-2013, 02:54 PM   #30
 
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Actually, the Gen2 does log MAP Volts.

It's not an item I've ever had a need to log, and therefore not part of my default items I have people log. Had to pull up a copy of the gen2 ATR and double check.

Unless you've got logs from before where it's reading higher, or your boost is reading off from what you're expecting I wouldn't worry about it.

That said, anybody with a gen2 willing to log MAP V and share what you see & what MAP sensor you're using?
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 Old 09-06-2013, 05:54 AM   #31
 
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Does anyone happen to know if the 03085 sensor will work with the Speedperf6manc3 plug and play harness? They don't currently show the 03085 as being compatible.
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 Old 09-06-2013, 06:00 AM   #32
 
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Yes, it does- order it up!

Ballenger shows their own internal part number (03085), which is the sensor commonly referred to here as the Bosch 845, and is shown on SP's page with the full number (0 281 002 845)

So no problem- have at it!
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 Old 09-16-2013, 12:20 AM   #33
 
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So happy I just found this thread. I've been wondering how accurate my boost readings are since I started logging again for the new Corksport BPV and the fact that I'm showing spiking. Been thinking about this upgrade and thanks to OP, it seems really straight forward. Mahalo!
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 Old 12-21-2013, 02:36 PM   #34
 
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Any idea if the following connector is what you need in place of the $65 piece you linked in the original post?
Bosch 4-way sealed Plug BSK Connector Pigtail for Bosch MAP Sensor

Saw it listed with the Bosch 3 bar map sensor on Edge and wasn't sure due to lack of a picture..
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 Old 12-21-2013, 03:21 PM   #35
 
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@Emew; I'm pretty sure that's just a standard Bosch connector to the sensor and four wires naked ready for soldering. Honestly that's the route I'm going since I am no longer stock-out-able anyway. Lol
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 Old 12-21-2013, 03:29 PM   #36
 
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At that price I'd presume it's not the completed pigtail assembly. Bitwise sells just the connector assembly for $25
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 Old 12-28-2013, 02:07 PM   #37
 
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Just curious, but after reading the help file in ATR it shows that the offset used for the Bosch 845 sensor should be -5.41. Obviously it's incorrect, since everyone who's following the steps here are getting good results with positive numbers, so why is it so far off?
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 Old 12-28-2013, 02:10 PM   #38
 
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i think it varies from car to car. i installed my 3 bar today and had to use a offset of 6.8 to get -.01 koeo
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 Old 12-28-2013, 02:12 PM   #39
 
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I know it varies, but the range given by Eric is all positive numbers.
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 Old 02-14-2014, 01:23 PM   #40
 
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@TiGraySpeed6 ; Same A-B values, Offset of 7 in every table achieved -.01

Wouldn't have been easy if not for all the lessons you've given me in ATR, thanks again! Hopefully that higher offset is acceptable!

Also not sure if anyone mentioned it but every .5 in either direction of offset is equivalent to .075, I had .14 at 6 offset, by going to 7 I achieved -.01
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