A quick 2.5 Bar MAP question

[RRRocketMan]

I've tried to do my homework and in several places it's been recommended that people using a 2.5 BAR tune should upgrade their MAP sensor to 12592525 which is a 3 BAR MAP. Now, this apparently is plug and play and will work. However I have to ask, since the voltage range of the sensor is calibrated to 3 BAR and the OS only reads 2.5, don't you have to recalibrate something in the OS? Otherwise how will it know that there's a part of the range it cannot read? As far as the OS is aware, 0-5 V covers only 2.5 BAR right? I'm not sure if I'm being clear but basically, what setup (if any) is involved after simply doing the hardware swap? Can you just plug'n'play the new sensor and drive around like nothing happened or do you need to do some re-calibration? Please clarify.

Also, is there a 2.5 BAR sensor that will work on the LS3 and if so, why don't we use it? Thanks.

[RRRocketMan]

Bumpity bump bump

[RRRocketMan]

Here is the stock MAP sensor in the Camaro SS:

http://mla-s2-p.mlstatic.com/map-gm-...6_122013-O.jpg

with part number 55573248

Here's the 2 BAR MAP sensor meant to be used with the 1.75 BAR custom OS, supposedly compatible with the LS3:

http://www.rockauto.com/getimage/get...x%2F5S1187.jpg

with part number 12580698

Now, while the electrical interface appears to be compatible, the manifold interface does not. I don't see how this is supposed to seal properly. Furthermore, the fastener hole present on the stock unit is absent from the 2 BAR one.

What am I missing here?

[DSteck]

Just enter the ZR1 data. I'll work. Don't get hung up on the description of the operating system.

[RRRocketMan]

Just enter the ZR1 data. I'll work. Don't get hung up on the description of the operating system.

Which sensor are you talking about, the one in my first post or the one in the post just above yours? In my latest post I asked about "physical" interface issues.

To avoid confusion there should be something included in the existing sticky like:

Application: LS3 E38
Recommended P/N:
Also Fits:
Pressure Rating:
Software Calibration Info:
Hardware Needed (harnesses, modification, etc.):


Because it will get confusing otherwise...

If I have a 1.75 BAR custom OS in a 2013 Camaro (LS3, E38), which part number do I need to buy that is as close to directly plug and play as possible? If there is no truly plug and play replacement, which part number should I buy, from whom and what do I have to do to it?

[DSteck]

12592525


You don't need a custom operating system to run a boost capable MAP sensor. Ignore the description of the OS.

[RRRocketMan]

12592525


You don't need a custom operating system to run a boost capable MAP sensor. Ignore the description of the OS.

Oh granted... however I do plan on running about 5 psi of boost and want the extra resolution of the VE OS so I will be using that table which goes up to 1.75 BAR.

So if I buy this p/n (which does look like a direct replacement for the stock sensor), all I do is plug it in and drive? I don't have to do anything in the tune? How does the software cope with the different voltage range? Do you lose resolution because most of the voltage range is not being used? One of the great advantages of the VE table in the 1.75 BAR OS is the increased resolution. I would hate to lose it.

Thanks for being patient.

[DSteck]

You plug it in and enter the calibration data from a ZR1. Then drive.

[RRRocketMan]

You plug it in and enter the calibration data from a ZR1. Then drive.

Thank you. I'll give it a try.

[RRRocketMan]

Well, rather than subject others to the same confusion I went through to get here, I made a video. Enjoy.

https://www.youtube.com/watch?v=tqU-T9R8mLo

[MikeOD]

Which sensor are you talking about, the one in my first post or the one in the post just above yours? In my latest post I asked about "physical" interface issues.

To avoid confusion there should be something included in the existing sticky like:

Application: LS3 E38
Recommended P/N:
Also Fits:
Pressure Rating:
Software Calibration Info:
Hardware Needed (harnesses, modification, etc.):


Because it will get confusing otherwise...

If I have a 1.75 BAR custom OS in a 2013 Camaro (LS3, E38), which part number do I need to buy that is as close to directly plug and play as possible? If there is no truly plug and play replacement, which part number should I buy, from whom and what do I have to do to it?

When you applied the custom OS, the VE table axis just happened to be filled out the way you see it. You can change that axis to whatever you want it to be up to 255 KPA. It's not a 1.75 bar, or a 1 bar, or anything else...it's just an "enhanced OS" in that it allows you to easily tune a conventional VE table, and gives you some other features such as boost enrichment in the fuel section, some VE multiplier tables, overboost fuel cut and a more "useful" temperature axis for the cooling fan controls. On the earlier E38, the enhancement did more as it cleared up some limitations with the MAF sensor, but those limits don't exist on the newer E38's like the 2010+ Camaro.

If anything, after you make a decision on how much boost to run...you'd want to configure the VE axis to go just a little higher than that as a max, and therefore get the most resolution that you can out of the table.