Whats the normal readings?
Thread Starter
TECH Fanatic
Joined: Jan 2010
Posts: 1,343
Likes: 2
From: South of Augusta,GA
Whats the normal readings? Just installed a Aeroforce, and dont know what is the normal reading should be. Like it shows TPS,MAF,MAP ...ect what should be normal settings. Car has been idling rich, MAP is 15 vac, is that low for a Z06 cam in a LQ4? I swapped this into a 1981T/A.
If it's MAP - yes 15 is good. Show's lots of vacuum. If it's really manifold vacuum, then it would be bad.
Manifold Vacuum @ WOT is usually close to 0.
MAP @ WOT is usually close to 100, but will vary based on weather and elevation due to the way it's calculated (barometric pressure minus manvac).
MAF will fluctuate with throttle application. Should be under 10 grams per second at idle and over 275 grams per second at WOT.
Manifold Vacuum @ WOT is usually close to 0.
MAP @ WOT is usually close to 100, but will vary based on weather and elevation due to the way it's calculated (barometric pressure minus manvac).
MAF will fluctuate with throttle application. Should be under 10 grams per second at idle and over 275 grams per second at WOT.
Thread Starter
TECH Fanatic
Joined: Jan 2010
Posts: 1,343
Likes: 2
From: South of Augusta,GA
Ok, will boost show vacum? 14/15vac is that bad. What show manifold vacum. Can you give me a idea of normal for other readings, TPS, IGN Adv, short term,long term,O2s, ect. Do i need to install a FPR other than the stock one? Car idle rich to the point of stalling out. Im add turbo soon, need it ready for a tune.
MAP = Manifold absolute pressure (in kPa)
TPS = Throttle position sensor
IGN ADV = Ignition advance
Short term = Short term fuel trim
Long term = long term fuel trim
O2 = Oxygen sensor reading (in mV)
MAF = Mass Air Flow
TPS = Throttle position sensor
IGN ADV = Ignition advance
Short term = Short term fuel trim
Long term = long term fuel trim
O2 = Oxygen sensor reading (in mV)
MAF = Mass Air Flow
Trending Topics
During idle and your foot isn't on the gal pedal, TPS should read zero. As you press the accelerator, MAP should increase. Like SSpdDmon said, at WOT (wide open throttle) MAP should read 100-105 kPa.
Ignition advance varies and at idle, the stock advance is anywhere between 20-30 degrees, but that also depends on if there are any modifiers present.
Short and long term fuel trims should be between -4 and 0. Sounds like yours are much lower (less than -4). O2 sensors should be between 400-700 mV, however that also depends on how rich/lean you are running.
At idle, the MAF should read <2 lb/min. Mass air flow is how much air is going into the engine so that will depend on TPS as well.
If any of that information is incorrect, someone please fix it - I'm still learning (but always will be).
Ignition advance varies and at idle, the stock advance is anywhere between 20-30 degrees, but that also depends on if there are any modifiers present.
Short and long term fuel trims should be between -4 and 0. Sounds like yours are much lower (less than -4). O2 sensors should be between 400-700 mV, however that also depends on how rich/lean you are running.
At idle, the MAF should read <2 lb/min. Mass air flow is how much air is going into the engine so that will depend on TPS as well.
If any of that information is incorrect, someone please fix it - I'm still learning (but always will be).
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo If it's 60...it's OK. 65 is a touch high. Do you have an adjustable fuel pressure regulator since it's an 81? LSx motors usually are set to run @ 58psi.
Has anyone tried to tune it before?
Has anyone tried to tune it before?
I'd also borrow/rent a FP guage to make sure yours is reading correctly.
As for needing a tune, I'd recommend getting one (or learning how to do it yourself) anytime something is changed. Since you have a virtually stock tune with an LS6 cam, your fueling is going to be off and so is your timing. You're likely within the parameters of the PCMs ability to adjust. BUT...things like fueling at WOT are a guess for the PCM as it doesn't have an accurate feedback loop to reference. It can only assume that any fueling requirements (%) added at part throttle are necessary at WOT. And timing....it will pull timing if it detects knock. But, timing will eventually creep back up to where it was only to repeat the cycle.
As for needing a tune, I'd recommend getting one (or learning how to do it yourself) anytime something is changed. Since you have a virtually stock tune with an LS6 cam, your fueling is going to be off and so is your timing. You're likely within the parameters of the PCMs ability to adjust. BUT...things like fueling at WOT are a guess for the PCM as it doesn't have an accurate feedback loop to reference. It can only assume that any fueling requirements (%) added at part throttle are necessary at WOT. And timing....it will pull timing if it detects knock. But, timing will eventually creep back up to where it was only to repeat the cycle.
