Map Sensor
Thread Starter
Racer
Joined: Aug 2011
Posts: 343
Likes: 10
Map Sensor
Ok Im a newbie to forced induction but im going to ask this question anyway: will the wrong MAP sensor cause your Absolute Manifold Pressure to read high? Causing your tuning software to calculate your boost way higher than it really is? I installed a supercharger and had it tuned. I was doing some data logging and noticed that my boost was more than double than what i expected. I checked the formula in HP tuners and it is correct. I also checked the barometric pressure and that appeared dead on, but the absolute manifold pressure I think is way high causing the boost level on HP tuners to read way high. I put 2 different mechanical boost gauges on and they both read within the range i expect. So this leads me to believe that I have the wrong MAP installed? The tune I have installed is a 3bar ZR1 tune. Please dime in and advise please. Oh BTW the car runs fine, maybe a little rich. Thanks
Race Director
Joined: Mar 2011
Posts: 13,262
Likes: 3,151
From: SW Florida
2021 C6 of the Year Finalist - Modified
I have a Heartbeat supercharger on my LS3.
The kit comes with an LS9 Manifold Absolute Pressure (MAP) sensor ... GM P/N: 12592525
You need the LS9 MAP sensor in boosted applications.
The Mass Air Flow (MAF) sensor used is the OEM stock LS3 'blade type' sensor ... no need to change.
The kit comes with an LS9 Manifold Absolute Pressure (MAP) sensor ... GM P/N: 12592525
You need the LS9 MAP sensor in boosted applications.
The Mass Air Flow (MAF) sensor used is the OEM stock LS3 'blade type' sensor ... no need to change.
Thread Starter
Racer
Joined: Aug 2011
Posts: 343
Likes: 10
Somewhat close to that (14.7)
Thats what I am thinking. Ill check that part number. Also the tune is speed density.
I have a Heartbeat supercharger on my LS3.
The kit comes with an LS9 Manifold Absolute Pressure (MAP) sensor ... GM P/N: 12592525
You need the LS9 MAP sensor in boosted applications.
The Mass Air Flow (MAF) sensor used is the OEM stock LS3 'blade type' sensor ... no need to change.
The kit comes with an LS9 Manifold Absolute Pressure (MAP) sensor ... GM P/N: 12592525
You need the LS9 MAP sensor in boosted applications.
The Mass Air Flow (MAF) sensor used is the OEM stock LS3 'blade type' sensor ... no need to change.
Race Director
Joined: Mar 2011
Posts: 13,262
Likes: 3,151
From: SW Florida
2021 C6 of the Year Finalist - Modified
The LS3 MAP sensor has a black colored label on it.
The LS9 MAP sensor has a red colored label
Here is what the LS9 (3 bar) sensor looks like, with it's red label ...
The LS9 MAP sensor has a red colored label
Here is what the LS9 (3 bar) sensor looks like, with it's red label ...
Last edited by Turbo6TA; Aug 14, 2019 at 07:27 PM.
Thread Starter
Racer
Joined: Aug 2011
Posts: 343
Likes: 10
Pro
Joined: Jun 2014
Posts: 553
Likes: 97
Pro
Joined: Feb 2015
Posts: 528
Likes: 245
From: Chicago IL
Exactly - absolute pressure includes atmospheric pressure. I believe the value you want to use is Calculated Boost
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Racer
Joined: Aug 2011
Posts: 343
Likes: 10
Thanks for the input. My new Map sensor will arrive today. I will likely install it tonight after work. I will post up my results. If everything goes good my next step will be looking for a good tune using HP Tuners for my A6.
Thread Starter
Racer
Joined: Aug 2011
Posts: 343
Likes: 10
The ZR1 MAP sensor fixed my problem. Thanks guys!