3 Bar sensor to keep my truck from boost coding?

[Ratchetnator]

When I am on a hill and my truck spikes over 15psi it is throwing a boost sensor code. I read in another post that some people replace there boost sensor with a 3 bar sensor to keep the ecm from coding. Is this really possible? If so where can I get the part?

 

[matuva]

At fleabay, search "GM 3bar", and yes, it's possible.

 

[Ratchetnator]

At fleabay, search "GM 3bar", and yes, it's possible.

will it need to be retuned or anything or is this plug and play

 

[Jorge6.5]

What will the 3 bar sensor accomplish? How will it stop from setting a code?

 

[THEFERMANATOR]

What will the 3 bar sensor accomplish? How will it stop from setting a code?

Basically it will make the ECM think it is only getting half as much boost. So if it codes at 12PSI, it now won't code until 24PSI. Old cheater trick to up the boost on a stock chip. If it is a stock truck with a stock turbo, 15 is to much boost for stock tuning. Drop it back to 12 to keep it from coding and you will get MORE HP as the extra boost is wasted HP.

 

[Jorge6.5]

So this will allow for higher boost without going into limp mode and defueling?

 

[THEFERMANATOR]

Yes. Instead of teh ECm thinking your making 15, it will now only think it's seeing about 8.

 

[Ratchetnator]

I a currently running a 15psi Kojo tune. It was set up to run with the vaccuum system but I ended up going turbomaster. It seems if I spike over 15lbs it will code. But no defueling or anything like that

 

[JiFaire]

You can also build yourself a boost fooler, as is diagrammed in the tech library. It does the same thing; returns a lower-than-actual value to the PCM, 'fooling' it into commanding more boost (or in this case, keeping it from setting a high-boost code)

 

[Jorge6.5]

I just ordered a 3 bar map to try out. Should have it by Tuesday. We will see how it works.

 

[Ratchetnator]

I just ordered a 3 bar map to try out. Should have it by Tuesday. We will see how it works.

Sweet. fill us in!

 

[JMJNet]

x2!!!

 

[guybb3]

8-10K ohm resistor in the green "B" map sensor wire will do it also. At least for an "F" engine.

 

[Jorge6.5]

Well today I received the 3 bar map and I have good news. I went out and did a few quick runs with the truck holding boost at nearly 15psi right up the same hills that would set limp mode with only 10psi and I held it there for several seconds.

I never had a problem setting codes or check engine light when over boosting but limp mode will always kick in and I would lose all power. Now I can keep my foot in the peddle while climbing hills and not have to worry about losing power from limp mode.

I got the 3 bar map sensor and harness plug for $20 from the auction site.

 

[JMJNet]

Cool!!! Thanks for the update.

 

[Ratchetnator]

Well today I received the 3 bar map and I have good news. I went out and did a few quick runs with the truck holding boost at nearly 15psi right up the same hills that would set limp mode with only 10psi and I held it there for several seconds.

I never had a problem setting codes or check engine light when over boosting but limp mode will always kick in and I would lose all power. Now I can keep my foot in the peddle while climbing hills and not have to worry about losing power from limp mode.

I got the 3 bar map sensor and harness plug for $20 from the auction site.

Awesome, What auction site did you use?

 

[JMJNet]

Let me guess, start with an "e" and end with "y" and a "b" and "a" in between.

 

[Jorge6.5]

Let me guess, start with an "e" and end with "y" and a "b" and "a" in between.

Yep! you got it lol.