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I have read that the GM pn 12580698 is a 2.5 bar sensor. I was told by another person that it is a 5 pin sensor with an integrated IAT. I called my local GM place and they told me its was 3 pin. To sum it up.....I am looking for the best 2.5 bar sensor to use with the 2.5 bar custom os for the e40. I dont want to buy the wrong sensor and pigtial. TIA
There is no 2.5 Bar sensor that is MAP only. The 0698 version is 2 bar (15 PSI boost) So unless you are going above ~15 PSI you are good. If you are headed for 2.5 bar (Max ~21 PSI Boost) you will have to get one of the old "brick" style 3 bar MAP sensors and run a vacuum line.
Thats what I wanted to do but there is a 256kpa limit in the computer. I am looking to run over 15 psi.
http://www.hptuners.com/forum/showth...1186#post81186
People are mentioning this number as 2.5 bar map sensor. I wouldn't mind if it was 2.5 map and Iat. If the Iat was correct I could just use it....or leave it unwired if not. Right?
Everyone says you can use a 3 bar map with the 2.5 os, but how? I understand that os still stops at 255kpa reguardless, but you can't even configure it for a 3 bar sensor. The map linear has has a max value of 256. Unless you can plug in a value around 300, I don't see how you can make it read correct.
What's the purpose of the Linear B?
You need to be careful with the Cobalt becuase they have 3 MAP sensors if i remember correctly.
1. combo MAP + IAT goes in the manifold, 2.5 bar
2. inlet air pressure (in the intake path) 1 bar i think
3. baro sensor (2 bar i think)
You should be able to wire up the 2.5bar MAP + IAT sensor and just not use the IAT part.
The numbers for this sensor are linear 270.59 (the max you can enter is 256) and offset -3.30, which i think the min you can enter is 0. It will be close but not exact.
In the later E38 ECM the limits are different and you can use a 3bar sensor no problems. I was getting confused between the two in a previous post as i was working on the E38 code at the time. Sorry.
Chris...
Stumbled across this post so I figured I would add some info.
A 3bar map sensor will not work properly. Since you can't enter a value higher than 256 it will always read incorrectly. (I had a 3 bar installed and read map values while applying regulated pressure to the sensor and a boost gauge). I'm sure you could install and use this sensor but your KPA reading will never actually be right.
2 bar obviously only reads 2 bar, so a real 2.5bar sensor is needed.
I found this sensor online-
20-250kpa and inexpensive.
http://www.freescale.com/files/senso...t/MPX4250A.pdf
http://www.mouser.com/search/refine.aspx?Ntt=MPX4250AP
Installed it in an 05 C6 with APS twins, re-tested with regulated air/gauge and it reads up to 256kpa while matching boost gauge values perfectly.
Thanks for the info, I think I'll sticky this thread
:cheers:
No problem. :)
So I am just checking before I go ahead and order this for a customer. Is the above freescale sensor the way to go with the custom 2.5bar os?
yep that sensor is a true 2.5bar, it is used in a lot of after market ECU's here in aus and works a treat
Quote:
Originally Posted by EC_Tune
Is this a brick style sensor or does in fit into the MAP port on the LS3 intake maniflod ?
fits in the manifold.
Thanks Bill,
P.S. Is that a Lap day at TMS??
TWS in College Station. Lots of fun!
I have this map sensor can someone tell me how it hooks up to my 05 gto wiring and what I have to change in the E40 and or tune? TIA
Bump...
It just plugs in...
Here is one I made that uses the Mouser electronics unit that is plug and play.
http://www.dpecorvettes.com/gpage4.html
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Im using this sensor in my car right now and it seems to work pretty good. Im using a linear of 256kpa(is this correct?) and my factory 1bar setup read 103kpa key on engine off..so I set the offset to 9 to get to the same 103kpa..Quote:
Originally Posted by c6dude
Quote:
Originally Posted by Snyper
Snyper
The Sensor's range is 20-250kp
http://www.dpecorvettes.com/gpage4.html
0.2V = 20 kPa - 2.9 PSI
4.9V = 250 kPa -36.25 PSI
Accuracy +- 1.5% of the full scale value (+- 0.5 PSI)
This sensor is linear which makes tuning easier.
Here is a chart that should help you out.
Perry
http://img48.imageshack.us/img48/5220/mpx4250a.jpg
Well HPT asks you what to enter for 5volts..so what would I put in that window?
For the DPE sensor, use:
Linear = 244.68
Offset = 10.21
Wouldn't the offset be dependant on location? My stock MAP reads 103KPA with the key on car off..so my offset is set at 8 and this one reads the same 103kpa..Quote:
Originally Posted by DSteck
Offset is what the sensor theoretically puts out at 0V. Linear is how much pressure per 5V the sensor records.
Making it read a normal number with the key off doesn't mean your calibration numbers will make it read correctly in vacuum or boost.
I know this is an old thread... but its stickied in the FAQ so I'm posting here.
I think maybe some things have changed since this was originally written and Im having trouble figuring out what is current / applicable to me.
I have a '10 Corvette LS3 / E38 PCM and want to upgrade the MAP sensor to a 2 or 3 bar. Im adding boost but will only be seeing 7-9 PSI for now, so I thought I'd go 2 bar MAP over a 3 bar for better resolution. Also, there is a "2 bar OS" upgrade for me in HP Tuners (3.6.26) but not a 3 bar or 2.5 bar..... and I'm new enough to HP Tuners to not be certain I can just scale that 2 bar OS out to a 3 bar MAP? Can I get away with a 3 bar ZR1 MAP sensor (part number 12592525) if I accept i will lose some resolution due to the larger scale of the 3 bar? I'm not finding a part number for a 2 bar, only a 2.5 DPE so figured maybe I should just go with the ZR1 MAP sensor due to $ differences.
Thanks in advance.
You should have like 2 different options here.
1. You can stay with the standard OS and just extend the Factory VVE table to support the 3 BAR MAP sensor. The VVE editor is under the EDIT tab, click the axis on the side and it will ask you what you to wish to change the table too. You then can select to extend the table to 310kpa. Once done, the table will have to be "built". It's fairly simple to just extend the table and create a nice upward slope in the table all the way to 3 bar for a starting point.
2. You could upgrade to the 2 BAR OS. Which will now remove the VVE editor and supply you with 3 new VE tables that are completely blank under the airflow tab. You would then have to create those VE tables from scratch using the data from your old VVE. The axis are different once the new VE tables come up and using something like excel can make it easy to input the data back into the table. All 3 VE tables need to match, so apply the data to the VE's and each time you make corrections to the VE make them all the same. The only thing about the 2 BAR OS though, is that it can only go to 2.5 BAR when you adjust the numbers out. Going past 2.5 bar is still okay but because the table ended you'd need to make sure it's going to be safe beyond that mark.
You can run a 3 bar MAP on a 2 bar OS or the standard OS no problem, just the linear and offset settings need to be correct for the sensor you are running.
The 2 bar OS does give you extra things to play with, like adjustable fan settings and a boost enrichment table for PE. Someone can add their 2 cents if I missed something or got something wrong.
just use zr1 map remote mounted the hole in manifold is correct size for a 1/4 npt tap no drill needed just run it in and get a barb fitting easy enough local dealer will have the pigtail and map sensor 66.00 for both wiring is lil different just get a diagram for both
Quote:
Originally Posted by Passtime
OK this is making a lot more sense, thank you. I was reading I needed to upgrade the OS but also reading I could just change the 2 values to support the new sensor. I think I'll go that route (no OS upgrade), the VVE editor looks fine. (I'm used to straight up VE tables but I can get used to this new method).Quote:
Originally Posted by 5FDP
I thought I read that the LS9/ZR1 MAP sensor is a direct plug and play drop in (aside from the tune change) for the Corvette LS3, is that not the case?Quote:
Originally Posted by Passtime
Option 1 does not seem to be working for me. Also you can only scale the map to 256 kpa which wont get you to 3 bar. Maybe I missed something. I have the MPVI2 Pro and setting up a twin turbo set up for a 2005 C6. The edit axis is not able to be selected.Quote:
Originally Posted by 5FDP
Why would some one not want to use option 2 with a 3 bar map and scale it that way?
Thank you
2005 C6 has an E40 ECM, which doesn't use VVE and the MAP Linear limit of 256 means you can't just plug in numbers for a "3bar" sensor. That question upthread about the 2010 E38 really didn't belong in this E40-specific topic at all, just further confuses things.
Anyone know if you can scale a 3 bar map sensor in the 2bar OS?
If you're talking about the E40, you cannot use a sensor that calls for Linear of more than the hard limit of 256kpa. Sensor also must have a positive Offset. No workarounds to get past those two limitations on the E40.
I like the EFI sorce 3 bar map.
https://www.efisource.com/wp/shop/ls...ar-map-sensor/
It is a direct replacement for the 1 bar in my truck.
That's great, but how do you input the required Linear=305 into a box that only accepts a max of 256?
i need some help . i have a gen4 e38 ecm 4.8 i put a remote mount turbo on and i have been trying to get the tune right ever since and it still is not right i have got close a cupula time but then make a change and its gone or my laptop crashed i have been at this for 8 months now and have not made much progress a am a novias to say the least any help would be greatly apr hear is what i got
That's an interesting tune for sure. I've never seen one done quite like yours. It's OL/MAF, which is ok...but I would have utilized the PE mode...and probably just do an SD tune. If you're going to run it like it is, I'd recommend making the entire PE table at least 1.0.Quote:
Originally Posted by jmfa
Hopefully you aren't running much boost yet. It still has stock 38 lb/hr injectors in it, along with a stock MAP sensor.
I would install a two bar MAP, and at least put a 50 lb/hr injector in it.