Set my MAP kpa to 99 now car runs bad, what gives?

 

Try setting it to 100.


Seriously, what you posted makes no sense.

 

How do you set a map sensor????

 

This sub-forum has gone downhill, if you're going to post dumb questions at least provide relevant info and take the time to construct a proper sentence.

Do you mean the PE enable MAP?

 

Wow hang on 1 second, This was posted from my phone and if you are going to be nasty don't respond.

This used to be a forum where we helped each other, hopefully we get back to that.

Anyway I did figure it out and was able to set it correctly thanks for the help 2xLS1!

 

Let me explain, in HP tuners I had my MAP sensor linea value set to like 385.0 kpa. This was obviously wrong because the MAP was not calibrated for NJ elevation etc (Sea Level). So under the advice of others I changed the value from the above to 284.01kpa which will read 99 - 100 when scanning the vehicle when the car is off.

What I was looking for in the original post, was what the value is to set this to in the NJ area. That being said the question was then answered.

The issue that I have now is obviously my fuel tables are all jacked up since the car was tuned under the original map setting which did not read 99 - 100 when the vehicle was off.

Apologies for the confusion... I did this from my mobile so it was quick. I didnt realize some would not understand and that it didnt make sense. At least a few picked up on it.

Thanks!

 

Ah so we are supposed to figure all that out from what is in post #1. And even after all that, still not one mention of the year, make, and model of the vehicle. But of course they are all the same so there is no need to mention that. Just saying car is enough. And you are puzzled why no one helps any more? It's because so many threads are like this one.

 

Lol not puzzled think I mentioned it earlier. Do you really want me to post all the mods I have to my car?

Listen I don't have time to go back and forth with you, I appreciate your responses truly and wish you the best of luck.

Thanks again for all the constructive comments I'll do better next time to ensure it's all accurate.


You asked about my car?

My car is an 02 Transam WS66 M6 with an LSX iron block 430 cubic inch motor. Oliver billet rods, Callie's crank, custom size diamond coated pistons (had to go up a size), blower cam, AFR 235 heads, stock rockers with upgraded bearings. FAST 102 intake, FAST 102 TB, FAST fuel rails. The Tb will change to a Nick Williams 102 next week.

I'm running a stock t56 for now going to a chromoly drive shaft, ford 9", grizzly center, 4.11 gears, Wavetrac diff, moser 35 spline axels.

I have a procharger f1r, Dan Schoenick cog kit with alternator relocation bracket and pro charger BOV sitting waiting to be installed.

My plan is to get the motor go as best as possible NA then standup my radiator install cog, do a custom intercooler etc. That will all go through a RPM TR6060 stage IV manual trans.

Fuel system is a nasty performance pro touring in tank setup with a magnafuel 4301 pump

Right now she has an SD tune on her that I'm tweaking.


I will be posting a complete build thread shortly.

 

My response was snarky, sorry for that, had a long day. But it was hard to figure out what you meant, and your car and mods etc don't show up in your sig. Sure posting from phones is quick and easy but people should still make the effort to communicate clearly.

If you're at sea level you can get the local atmospheric pressure from your local weather station, usually in hPa, divide by 10 to get kPa. Subtract 1 kPa for each 100 meters above sea level (this works up to about 1000 meters). If you have a dial it in again may as well get it spot on.

 

I don't get how you can set the value to a certain number for a location and be "set"?

Each state doesn't have it's individual kPa value that stays constant. That changes with weather on a daily basis...some days you have 96 and some days you have 102.

 

Thanks and I completely understand what you are saying and agree.

I definitely will use that formula today and see what happens, I'm curious to see where I am actually supposed to be around...

 

Very true however having a close enough number from another poster that is in the same area will start me off especially because I have no idea what it should be.

Prior to bring it down to 285 I was at 385 which obviously is way off.

I am going to use the above Info and see how far off I am now

 

You need to enter the values for the MAP sensor. Where you are (altitude) doesn't matter. Your sensor will have a specific linear and offset. This is a fixed number. Once those are set properly the sensor allows the PCM to adjust for changes in altitude accurately.

As an example the ZR1 MAP 3-bar 12592525 settings are:
Linear: 312.50
Offset: -11.25

These numbers do not change based on location.......

 

I have never heard of calibrating a MAP sensor to a specific location, be in at sea level or at 5,000ft elevation.

The sensor should be calibrated to give a specific voltage based on whatever atmosphere it's seeing, be it vacuum while at idle, or in boost, calibrating it to sea level is not necessary and the wrong way to do things.

 

bingo!!!

 

That's interesting considering a well known tuner said it needed to be addressed since my values were off and I wasn't boosted...

 

So how do I configure the linear for a FAST 3bar map?

 

FAST 3 Bar Map calibration:

map sensor linear = 305.0 kpa
map sensor offset = 6.0 kpa

 

So why would the offset be 0?

 

In your tune under engine diagnostics -> airflow, put the values I posted in my last post for the MAP sensor.