"The OFFICIAL "Whose running a 2.7" pulley with GMPP Stage Kit" Thread
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From: soon to banned as I am from MANITOBA?
Originally Posted by 06black
Jason...i'm kinda easy oy my babe...she only gets 7400 a few times a day.
as far as what Max_boost is saying about the ECU commanding less fuel thus a lower IDC hes correct....
as far as the guy who asked about why 13:1 is bad for the moter heres my reasoning....
first off if your AFR's are 15:1 or higher then you need to check your tune....runing the car some waht lean in a few un-common rev spots isnt bad because runing the car lean once in a while is good to help clean out the car from deposits...but any type of long term is bad!1!
from my past exsperances with small engines...runing an engine lean builds heat and deprives the motor of a type of lubercation...even tho we have oil and all that i supose fuel only helps things slip along....so a buid up and heat and more work for the motor to make things moves ends up killing ****.
dont know how true that is in our case but thats my best guess rite now.
as far as what Max_boost is saying about the ECU commanding less fuel thus a lower IDC hes correct....
as far as the guy who asked about why 13:1 is bad for the moter heres my reasoning....
first off if your AFR's are 15:1 or higher then you need to check your tune....runing the car some waht lean in a few un-common rev spots isnt bad because runing the car lean once in a while is good to help clean out the car from deposits...but any type of long term is bad!1!
from my past exsperances with small engines...runing an engine lean builds heat and deprives the motor of a type of lubercation...even tho we have oil and all that i supose fuel only helps things slip along....so a buid up and heat and more work for the motor to make things moves ends up killing ****.
dont know how true that is in our case but thats my best guess rite now.
so I am not asking an opinion or your experience with small engines. Detonation is what kills an engine that is fact also called preignition.
I am done my rant now lets get down to hard known facts.
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From: Hubert NC
So just to sum up what went on while I was away:
06blackg85ss's IDC were lower because his tune had the PCM commanding less fuel to maintain a 13.1 or so. This means as long as he is comfortable running that AFR then his injectors are safe. But since the GM Stage2 tune commands more fuel to run a lower AFR, say around 11 in some cases, then the injectors will work harder to keep up and go static much sooner than with the the other tune. Bottom line, if you don't like a leaner AFR then get 60# injectors.
This just in, bashing another Cobalts set up in your Sig is gay, and if you do so means your parents weren't married when you were conceived.
06blackg85ss's IDC were lower because his tune had the PCM commanding less fuel to maintain a 13.1 or so. This means as long as he is comfortable running that AFR then his injectors are safe. But since the GM Stage2 tune commands more fuel to run a lower AFR, say around 11 in some cases, then the injectors will work harder to keep up and go static much sooner than with the the other tune. Bottom line, if you don't like a leaner AFR then get 60# injectors.
This just in, bashing another Cobalts set up in your Sig is gay, and if you do so means your parents weren't married when you were conceived.
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From: Ottawa
Originally Posted by blown06
https://www.cobaltss.net/forums/2-0l-lsj-performance-tech-47/60-lbers-harness-%24199-30581/
$199 LFP not sure if the sale is still going on I hope so because I plan on doing a 2.6"
$199 LFP not sure if the sale is still going on I hope so because I plan on doing a 2.6"
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From: the glove
Originally Posted by ssnipes
This is not a two stroke so please dont base your experience on that. When I talk theory I am referring to the knowledge of the car will run weak but it wont die. just feel like it is running out of gas. motors need to 15:1 to run period. that is theory. when it comes to tuning the only thing that I know for sure you need to richen it up for power but not do much and not too little. just this talk of blowing up a motor kills me cause from 12:1 to 13:1 is not enough difference to kill the motor or not enough lubricant when you putt around at 15:1 to get decent fuel mileage.
so I am not asking an opinion or your experience with small engines. Detonation is what kills an engine that is fact also called preignition.
I am done my rant now lets get down to hard known facts.
so I am not asking an opinion or your experience with small engines. Detonation is what kills an engine that is fact also called preignition.
I am done my rant now lets get down to hard known facts.
so yes lets please get back to the facts....
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Joined: 11-11-05
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From: Oceanside, Ca
I believe that the IDC formula is incorrect for 42lb injectors in those logs. IIRC that 54% needs to be doubled to equal 108%. I'm searching for the correct formula. Its just a litle hard dealing with a hangover and trying to read the screen 
.
Found it, change the PID for Injector Duty to reflect this
(sens.112)*(sens.70)/1200
Don't rely on HPTuners formulas being correct 100%. Think about the TPS (Throttle Position Sensor) maxing out @ 88%. It wasn't designed with our cars in mind.
Just so you know where I got this info from.
go to RL forum and look for this thread
.Found it, change the PID for Injector Duty to reflect this
(sens.112)*(sens.70)/1200
Don't rely on HPTuners formulas being correct 100%. Think about the TPS (Throttle Position Sensor) maxing out @ 88%. It wasn't designed with our cars in mind.
Just so you know where I got this info from.
Originally Posted by WopOnTour
Injector base pulse width (PID) x Engine Speed / 1200
HP Scan logs - Baseline Dyno run
Last edited by Doc; Sep 9, 2006 at 12:59 PM.
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From: Hubert NC
Originally Posted by Doc
I believe that the IDC formula is incorrect for 42lb injectors in those logs. IIRC that 54% needs to be doubled to equal 108%. I'm searching for the correct formula. Its just a litle hard dealing with a hangover and trying to read the screen .
Found it, change the PID for Injector Duty to reflect this
(sens.112)*(sens.70)/1200
Don't rely on HPTuners formulas being correct 100%. Think about the TPS (Throttle Position Sensor) maxing out @ 88%. It wasn't designed with our cars in mind.
Just so you know where I got this info from.
go to RL forum and look for this thread
.Found it, change the PID for Injector Duty to reflect this
(sens.112)*(sens.70)/1200
Don't rely on HPTuners formulas being correct 100%. Think about the TPS (Throttle Position Sensor) maxing out @ 88%. It wasn't designed with our cars in mind.
Just so you know where I got this info from.
go to RL forum and look for this thread
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From: Hubert NC
Originally Posted by Doc
On a side note: which clutch did you end up getting..?
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From: the glove
Originally Posted by Doc
I believe that the IDC formula is incorrect for 42lb injectors in those logs. IIRC that 54% needs to be doubled to equal 108%. I'm searching for the correct formula. Its just a litle hard dealing with a hangover and trying to read the screen .
Found it, change the PID for Injector Duty to reflect this
(sens.112)*(sens.70)/1200
Don't rely on HPTuners formulas being correct 100%. Think about the TPS (Throttle Position Sensor) maxing out @ 88%. It wasn't designed with our cars in mind.
Just so you know where I got this info from.
go to RL forum and look for this thread
.Found it, change the PID for Injector Duty to reflect this
(sens.112)*(sens.70)/1200
Don't rely on HPTuners formulas being correct 100%. Think about the TPS (Throttle Position Sensor) maxing out @ 88%. It wasn't designed with our cars in mind.
Just so you know where I got this info from.
go to RL forum and look for this thread
good man doc!....i'll have to go back and refigure my IDC's....
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Joined: 10-14-05
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From: burlington,nj/bethlehem pa
ok so what im getting outta of all this is that with my gm stage 2 and 2.8 pulley (nothing else) is that its bad for my car or what...aight trying to **** this **** up just yet
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From: Oceanside, Ca
Originally Posted by StinkBOMB
FX 400 six puck. 2 more days and the fun begins. I feel sorry for those mechanics. They must be gluttons for pain. Hey Doc, why did you say double the IDC's on that other thread about 42lbers and smaller pulleys'?
(sens.112)*(sens.70)/2400
and it should be this
(sens.112)*(sens.70)/1200
make sense Sarge
..?thats the clutch I'm thinking about.
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Joined: 02-23-05
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From: Florida
Originally Posted by Doc
I believe that the IDC formula is incorrect for 42lb injectors in those logs. IIRC that 54% needs to be doubled to equal 108%. I'm searching for the correct formula. Its just a litle hard dealing with a hangover and trying to read the screen .
Found it, change the PID for Injector Duty to reflect this
(sens.112)*(sens.70)/1200
Don't rely on HPTuners formulas being correct 100%. Think about the TPS (Throttle Position Sensor) maxing out @ 88%. It wasn't designed with our cars in mind.
Just so you know where I got this info from.
go to RL forum and look for this thread
.Found it, change the PID for Injector Duty to reflect this
(sens.112)*(sens.70)/1200
Don't rely on HPTuners formulas being correct 100%. Think about the TPS (Throttle Position Sensor) maxing out @ 88%. It wasn't designed with our cars in mind.
Just so you know where I got this info from.
go to RL forum and look for this thread
Ok, so the other night I did some data logging with my Aeroforce, Injector Pulse Width maxed out at 16.4 @ 7100 rpms (I usually only take 1st gear up to 7000, the rest I shift at 6700). So if I am understanding that formula correctly, that means my injectors are at 97% ? I'm so confused on this stuff...
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From: Hubert NC
Originally Posted by Doc
because the original formula in HPTuners is this
(sens.112)*(sens.70)/2400
and it should be this
(sens.112)*(sens.70)/1200
make sense Sarge ..?
thats the clutch I'm thinking about.
(sens.112)*(sens.70)/2400
and it should be this
(sens.112)*(sens.70)/1200
make sense Sarge
..?thats the clutch I'm thinking about.
Yeah that formula makes sense. You bringing Kritter and them down next time?
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From: New Cumberland, PA
I am running a 2.79 with the GMPP Stage 2. All my mods are in my sig. Mine runs lean, i made a post about this last week after i got mine dynoed. But I have also had no problems, if it was to lean the computer would throw a code
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From: Horseheads, NY
Originally Posted by Z28 SS
I am running a 2.79 with the GMPP Stage 2. All my mods are in my sig. Mine runs lean, i made a post about this last week after i got mine dynoed. But I have also had no problems, if it was to lean the computer would throw a code
Dan
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From: Oceanside, Ca
Originally Posted by StinkBOMB
Whoaa there Doc, Sarge is an Army term there PO. Yeah that formula makes sense. You bringing Kritter and them down next time?
Yeah that formula makes sense. You bringing Kritter and them down next time? Hopefully they will come down.
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From: Hubert NC
Originally Posted by Doc
Hey Sarge, I still outrank you
Hopefully they will come down.
Hopefully they will come down.
1 more day till clutch time. I'll let you know how it goes. I just want to put that 2.8 pulley on. It really wakes up the S/C.
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From: the glove
Originally Posted by distillion
is anyone with the 60 pounders expieriencing wierd idle surges, i just read apost about it, wondering if its just a matter of fine tuning??
yea at first there is an odd idel...but there is a fix...go find it!
got mine fixed...its a dumb lil thing in your tune.
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From: Oceanside, Ca
try this
Engine>Fuel Control>General Fuel>
Short Pulse limit = 1.000 msec
Engine>Fuel Control>General Fuel>
Min PW = 0.398 msec (as you will see, this is redundant because of the short pulse adder)
Engine>Fuel Control>General Fuel>
Short Pulse Adder =
Engine>Spark Control>Spark Advance>
Overspeed P/N=(entire table * 0.7)
Engine>Spark Control>Spark Advance>
Underspeed P/N=(entire table * 0.7)
Originally Posted by someone smarter than I
Engine>Fuel Control>General Fuel>
Short Pulse limit = 1.000 msec
Engine>Fuel Control>General Fuel>
Min PW = 0.398 msec (as you will see, this is redundant because of the short pulse adder)
Engine>Fuel Control>General Fuel>
Short Pulse Adder =
Code:
0.000 0.125 0.250 0.375 0.500 0.625 0.750 0.875 1.000 .3984 .3516 .2969 .2500 .2031 .1484 .1016 .0469 .0000
Overspeed P/N=(entire table * 0.7)
Engine>Spark Control>Spark Advance>
Underspeed P/N=(entire table * 0.7)