Tuning Help
Thread Starter
Instructor
Joined: Nov 2012
Posts: 240
Likes: 18
From: Carrollton Illinois
Tuning Help
Hey all,
I just finished installing my cam and I am working on tuning it. I am utilizing EEHack for datalogging and TunerCATS for tuning it. On my first drive utilizing a stock tune I was running pretty lean. So, I went into the MAF table and edited the AFGS by adding %10. This definitely made the car run alot better and brought my BLM's down. For some reason at partial throttle around 3000 rpm it occasionally falls on it's face, it fells like a complete misfire across the board. Looking at the datalog the MAF value spikes to 450+ g/s which is very unrealistic. I have not run the car at WOT as I know that's a different story and I want to get partial throttle down first. I have done days worth of reading so I have a pretty good idea as to what is going on.
Car info: cam: 222/226 @ 0.050, .530 life, 113 LSA, Headers, and a new Petris Opti
It wont let me post my datalog so, if someone is willing to help I can email the file to you or send it to you however you would like.
Thank you!
-Colton
I just finished installing my cam and I am working on tuning it. I am utilizing EEHack for datalogging and TunerCATS for tuning it. On my first drive utilizing a stock tune I was running pretty lean. So, I went into the MAF table and edited the AFGS by adding %10. This definitely made the car run alot better and brought my BLM's down. For some reason at partial throttle around 3000 rpm it occasionally falls on it's face, it fells like a complete misfire across the board. Looking at the datalog the MAF value spikes to 450+ g/s which is very unrealistic. I have not run the car at WOT as I know that's a different story and I want to get partial throttle down first. I have done days worth of reading so I have a pretty good idea as to what is going on.
Car info: cam: 222/226 @ 0.050, .530 life, 113 LSA, Headers, and a new Petris Opti
It wont let me post my datalog so, if someone is willing to help I can email the file to you or send it to you however you would like.
Thank you!
-Colton
Pro
Joined: Aug 2000
Posts: 700
Likes: 1
From: Florida
Please keep us posted on your findings and progress. 
Hey all,
I just finished installing my cam and I am working on tuning it. I am utilizing EEHack for datalogging and TunerCATS for tuning it. On my first drive utilizing a stock tune I was running pretty lean. So, I went into the MAF table and edited the AFGS by adding %10. This definitely made the car run alot better and brought my BLM's down. For some reason at partial throttle around 3000 rpm it occasionally falls on it's face, it fells like a complete misfire across the board. Looking at the datalog the MAF value spikes to 450+ g/s which is very unrealistic. I have not run the car at WOT as I know that's a different story and I want to get partial throttle down first. I have done days worth of reading so I have a pretty good idea as to what is going on.
Car info: cam: 222/226 @ 0.050, .530 life, 113 LSA, Headers, and a new Petris Opti
It wont let me post my datalog so, if someone is willing to help I can email the file to you or send it to you however you would like.
Thank you!
-Colton
I just finished installing my cam and I am working on tuning it. I am utilizing EEHack for datalogging and TunerCATS for tuning it. On my first drive utilizing a stock tune I was running pretty lean. So, I went into the MAF table and edited the AFGS by adding %10. This definitely made the car run alot better and brought my BLM's down. For some reason at partial throttle around 3000 rpm it occasionally falls on it's face, it fells like a complete misfire across the board. Looking at the datalog the MAF value spikes to 450+ g/s which is very unrealistic. I have not run the car at WOT as I know that's a different story and I want to get partial throttle down first. I have done days worth of reading so I have a pretty good idea as to what is going on.
Car info: cam: 222/226 @ 0.050, .530 life, 113 LSA, Headers, and a new Petris Opti
It wont let me post my datalog so, if someone is willing to help I can email the file to you or send it to you however you would like.
Thank you!
-Colton
Thread Starter
Instructor
Joined: Nov 2012
Posts: 240
Likes: 18
From: Carrollton Illinois
Update:
I finished installing my wideband today and took it for another drive. The same issue arose with it cutting out right around 3000 rpms and looking at the datalog it was once again the MAF saying something like 400 g/s out of no where. So, i decided to run the car in speed density and I unhooked the MAF. This made a HUGE improvement. It was really running on the rich side as my new datalog shows but there was no miss and it was smooth across the board. So for now I will tune it in speed density and go from there
Colton
I finished installing my wideband today and took it for another drive. The same issue arose with it cutting out right around 3000 rpms and looking at the datalog it was once again the MAF saying something like 400 g/s out of no where. So, i decided to run the car in speed density and I unhooked the MAF. This made a HUGE improvement. It was really running on the rich side as my new datalog shows but there was no miss and it was smooth across the board. So for now I will tune it in speed density and go from there
Colton
Burning Brakes
Joined: Mar 2005
Posts: 1,082
Likes: 115
From: Richmond Hill Ontario
I took a look at your datalog and I can see 3 events where your MAF took a spike. I call these spikes anomalies because they just randomly show up for 1 timestamp and return to normal. When they do occur I cannot see any pertinent change in your engine data. I would just take them as unexplained occurrences. If they continue you may want to try replacing your MAF and see if it goes away.
The MAF spikes occurred at the following timestamps in the datalog:
#1522@158.7
#4360@455.6
#5198@543.4
The MAF spikes occurred at the following timestamps in the datalog:
#1522@158.7
#4360@455.6
#5198@543.4
Last edited by FrankieD; May 29, 2017 at 10:06 PM.
Thread Starter
Instructor
Joined: Nov 2012
Posts: 240
Likes: 18
From: Carrollton Illinois
I took a look at your datalog and I can see 3 events where your MAF took a spike. I call these spikes anomalies because they just randomly show up for 1 timestamp and return to normal. When they do occur I cannot see any pertinent change in your engine data. I would just take them as unexplained occurrences. If they continue you may want to try replacing your MAF and see if it goes away.
The MAF spikes occurred at the following timestamps in the datalog:
#1522@158.7
#4360@455.6
#5198@543.4
The MAF spikes occurred at the following timestamps in the datalog:
#1522@158.7
#4360@455.6
#5198@543.4
Burning Brakes
Joined: Mar 2005
Posts: 1,082
Likes: 115
From: Richmond Hill Ontario
Sounds like a great plan. You may also want to look at adjusting your BLM Cell RPM Boundaries and BLM Cell Map Boundaries. By doing so you will more likely get better tuning resolution for VE adjustments
Last edited by FrankieD; May 30, 2017 at 06:28 AM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Thread Starter
Instructor
Joined: Nov 2012
Posts: 240
Likes: 18
From: Carrollton Illinois
Frankie,
Can you expand on what you mean by adjusting those boundaries to increase the tuning resolution? I am pretty sure I know what you mean but I am new at this
Thanks!
Colton
Can you expand on what you mean by adjusting those boundaries to increase the tuning resolution? I am pretty sure I know what you mean but I am new at this
Thanks!
Colton
Safety Car
Joined: Sep 2001
Posts: 4,150
Likes: 551
From: Glenbeulah Wi
Hey all,
I just finished installing my cam and I am working on tuning it. I am utilizing EEHack for datalogging and TunerCATS for tuning it. On my first drive utilizing a stock tune I was running pretty lean. So, I went into the MAF table and edited the AFGS by adding %10. This definitely made the car run alot better and brought my BLM's down. For some reason at partial throttle around 3000 rpm it occasionally falls on it's face, it fells like a complete misfire across the board. Looking at the datalog the MAF value spikes to 450+ g/s which is very unrealistic. I have not run the car at WOT as I know that's a different story and I want to get partial throttle down first. I have done days worth of reading so I have a pretty good idea as to what is going on.
Car info: cam: 222/226 @ 0.050, .530 life, 113 LSA, Headers, and a new Petris Opti
It wont let me post my datalog so, if someone is willing to help I can email the file to you or send it to you however you would like.
Thank you!
-Colton
I just finished installing my cam and I am working on tuning it. I am utilizing EEHack for datalogging and TunerCATS for tuning it. On my first drive utilizing a stock tune I was running pretty lean. So, I went into the MAF table and edited the AFGS by adding %10. This definitely made the car run alot better and brought my BLM's down. For some reason at partial throttle around 3000 rpm it occasionally falls on it's face, it fells like a complete misfire across the board. Looking at the datalog the MAF value spikes to 450+ g/s which is very unrealistic. I have not run the car at WOT as I know that's a different story and I want to get partial throttle down first. I have done days worth of reading so I have a pretty good idea as to what is going on.
Car info: cam: 222/226 @ 0.050, .530 life, 113 LSA, Headers, and a new Petris Opti
It wont let me post my datalog so, if someone is willing to help I can email the file to you or send it to you however you would like.
Thank you!
-Colton
Thread Starter
Instructor
Joined: Nov 2012
Posts: 240
Likes: 18
From: Carrollton Illinois
I do not like to modify the MAF tables unless you are sure they are incorrect. More then likely your injector constant or injector data was not adjusted correctly for the injectors you are running. The spike in the MAF readings could be an issue with a poor transition from on MAF table to the other, the MAF tables must always be increasing in value from one table to the next. If you have any one cell higher up in the frequency curve that is lower then the proceeding cell it causes funny issues with the EE defination file.
Thread Starter
Instructor
Joined: Nov 2012
Posts: 240
Likes: 18
From: Carrollton Illinois
I do not like to modify the MAF tables unless you are sure they are incorrect. More then likely your injector constant or injector data was not adjusted correctly for the injectors you are running. The spike in the MAF readings could be an issue with a poor transition from on MAF table to the other, the MAF tables must always be increasing in value from one table to the next. If you have any one cell higher up in the frequency curve that is lower then the proceeding cell it causes funny issues with the EE defination file.
Safety Car
Joined: Sep 2001
Posts: 4,150
Likes: 551
From: Glenbeulah Wi
Good luck, I hope that takes care of your issue.
Thread Starter
Instructor
Joined: Nov 2012
Posts: 240
Likes: 18
From: Carrollton Illinois
I decided to start with running it in speed density and I got it pretty close throughout the table. I ranging from 124-132 BLM so a little more tuning is needed but not bad progress for today!