LT4 tune need help
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Joined: Apr 2011
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From: denver colorado
LT4 tune need help
i just installed an arh long tube headers with uncatted 3” xpipe upper pulley and BMS dropin filter im using hptuner to tune my car and im not expert so i will need help for sure where to start i have a wide band hooked up and ill be watching it while tuning.
since i have the headers on i will have the CEL on so how to shut that off ?
Also is there anything beside fuel that i need to adjust?
Thanks for the help
since i have the headers on i will have the CEL on so how to shut that off ?
Also is there anything beside fuel that i need to adjust?
Thanks for the help
Burning Brakes
Joined: Aug 2009
Posts: 770
Likes: 164
From: Southeastern NM
Not trying to be a douche here, but rule of thumb is, if you don't even know how to get into engine diagnostics and change your p-codes to "no error return" you have NO business tuning. Lol, get an experienced professional to do it..
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From: denver colorado
Thx and have a great day
Pro
Joined: Feb 2003
Posts: 745
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From: Detroit MI
I dont think tuners were born as tuners i think its an easy job and i can do it since i dont have much moods mostly ill be adjusting fuel and timing and dont worry about the p code mr google will tell me how to , there are great guys always post how to videos just to help people learn new things.
More to the point, once you modify the airflow, you really should recalibrate the Virtual VE model in the ECM. This involves many steps to set the ECM into a mode where it is only using the one model (VE, not MAF) in open loop and then you collect data using a load bearing dynamometer and high quality wideband to determine lambda error. These recorded errors are then used to calculate a new Virtual VE surface, which in turn is used to calculate new coefficients that get flashed into the ECM to improve the accuracy of the model. After you get the errors down to less than about 5%, you repeat the process for the MAF sensor and validate the torque control model. Simple, right?
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Joined: Apr 2011
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From: denver colorado
[QUOTE=Billy@MTI;1597253921]Are there no LT tuners in your area?[/QUOTE
im overseas and its really hard to find a tuner that i can trust anyway ive talked to someone from USA to remot tune it
thank you
im overseas and its really hard to find a tuner that i can trust anyway ive talked to someone from USA to remot tune it
thank you
Drifting
Joined: Nov 2005
Posts: 1,924
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I really think you need to find someone that knows how to tune it. Or maybe you can have it done remotely? That is a very spendy motor to just wing it. ATLEAST you have a wide band, that can get you somewhat close I'm sure IF you have no other option.
I think id lose some sleep at night if I was in your shoes and just trying to wing it. And I have plenty of experience with tuning cars over the years. But hey if you got the money to risk it, let us know how it works out.
I think id lose some sleep at night if I was in your shoes and just trying to wing it. And I have plenty of experience with tuning cars over the years. But hey if you got the money to risk it, let us know how it works out.
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Burning Brakes
Joined: Aug 2009
Posts: 770
Likes: 164
From: Southeastern NM
thats why the title says need help tuning . I dont think tuners were born as tuners i think its an easy job and i can do it since i dont have much moods mostly ill be adjusting fuel and timing and dont worry about the p code mr google will tell me how to , there are great guys always post how to videos just to help people learn new things.
Thx and have a great day
Former Vendor
Joined: Nov 2005
Posts: 11,792
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From: Ossining New York
St. Jude Donor '07-'08-'09-'10-'12-'13-'14
Thank you for the mention!
Yes, with our AutoCal tuning package we can get your Corvette running the way it should!
914-332-0049
Thanks again!
Chuck CoW
Pro
Joined: Nov 2015
Posts: 564
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From: San Antonio Texas
Nothing wrong with trying to learn as I did and am doing the same thing EXCEPT I let the pros do the work and I kept studying the GenV book. I copied the original stock tune and then started studying the changes they made and together with studying the light bulb in the brain turned on. It helps to have the knowledge and especially the HP Tuning tools as I’ve been able to use the WiFi from car at track and email my tuner the data logs after a run and he makes adjustments and emails the file to me which I then upload and make a run. It’s helped a ton having it and I’ve gotten a lot of folks out of binds just by having it.
I really would let a pro do it and then study some more. The Gen V tuning book will help also I highly recommend it and then just spend some time on the laptop and before you know it you’ll be able to start making minor adjustments but just be sure and save all files and properly document every change you made so if you goof up you can upload the last good tune. I strongly emphasize to be very careful on the changes you make unless you fully understand it!
Good luck and I’m glad to see someone other than myself taking the bull by the horns.
I really would let a pro do it and then study some more. The Gen V tuning book will help also I highly recommend it and then just spend some time on the laptop and before you know it you’ll be able to start making minor adjustments but just be sure and save all files and properly document every change you made so if you goof up you can upload the last good tune. I strongly emphasize to be very careful on the changes you make unless you fully understand it!
Good luck and I’m glad to see someone other than myself taking the bull by the horns.
Dig
Joined: Jan 2006
Posts: 5,467
Likes: 1,127
From: Port Saint Lucie FLORIDA & HONDURAS
Nothing wrong with trying to learn as I did and am doing the same thing EXCEPT I let the pros do the work and I kept studying the GenV book. I copied the original stock tune and then started studying the changes they made and together with studying the light bulb in the brain turned on. It helps to have the knowledge and especially the HP Tuning tools as I’ve been able to use the WiFi from car at track and email my tuner the data logs after a run and he makes adjustments and emails the file to me which I then upload and make a run. It’s helped a ton having it and I’ve gotten a lot of folks out of binds just by having it.
I really would let a pro do it and then study some more. The Gen V tuning book will help also I highly recommend it and then just spend some time on the laptop and before you know it you’ll be able to start making minor adjustments but just be sure and save all files and properly document every change you made so if you goof up you can upload the last good tune. I strongly emphasize to be very careful on the changes you make unless you fully understand it!
Good luck and I’m glad to see someone other than myself taking the bull by the horns.
I really would let a pro do it and then study some more. The Gen V tuning book will help also I highly recommend it and then just spend some time on the laptop and before you know it you’ll be able to start making minor adjustments but just be sure and save all files and properly document every change you made so if you goof up you can upload the last good tune. I strongly emphasize to be very careful on the changes you make unless you fully understand it!
Good luck and I’m glad to see someone other than myself taking the bull by the horns.
Thank you very much for your post !!! You are a realist !!
Thread Starter
Advanced
Joined: Apr 2011
Posts: 80
Likes: 0
From: denver colorado
Nothing wrong with trying to learn as I did and am doing the same thing EXCEPT I let the pros do the work and I kept studying the GenV book. I copied the original stock tune and then started studying the changes they made and together with studying the light bulb in the brain turned on. It helps to have the knowledge and especially the HP Tuning tools as I’ve been able to use the WiFi from car at track and email my tuner the data logs after a run and he makes adjustments and emails the file to me which I then upload and make a run. It’s helped a ton having it and I’ve gotten a lot of folks out of binds just by having it.
I really would let a pro do it and then study some more. The Gen V tuning book will help also I highly recommend it and then just spend some time on the laptop and before you know it you’ll be able to start making minor adjustments but just be sure and save all files and properly document every change you made so if you goof up you can upload the last good tune. I strongly emphasize to be very careful on the changes you make unless you fully understand it!
Good luck and I’m glad to see someone other than myself taking the bull by the horns.
I really would let a pro do it and then study some more. The Gen V tuning book will help also I highly recommend it and then just spend some time on the laptop and before you know it you’ll be able to start making minor adjustments but just be sure and save all files and properly document every change you made so if you goof up you can upload the last good tune. I strongly emphasize to be very careful on the changes you make unless you fully understand it!
Good luck and I’m glad to see someone other than myself taking the bull by the horns.
thank you so much
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Advanced
Joined: Apr 2011
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From: denver colorado
Well i put the car on the dyno with headers and pulley on stock CAI and guess what ? The tune wasn’t a must car was running nice AFR (11.8) and 24 degree of timing no knock. Then I installed an AFE CAI and it was leaner on top end but 15% fuel took care of it , however someone is etuning the car right now to get me most of the hp out of it and it should be done soon .
gave a good day everyone
gave a good day everyone
Safety Car
Joined: Apr 2010
Posts: 4,231
Likes: 451
From: Maryland
Well i put the car on the dyno with headers and pulley on stock CAI and guess what ? The tune wasn’t a must car was running nice AFR (11.8) and 24 degree of timing no knock. Then I installed an AFE CAI and it was leaner on top end but 15% fuel took care of it , however someone is etuning the car right now to get me most of the hp out of it and it should be done soon .
gave a good day everyone
gave a good day everyone
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Advanced
Joined: Apr 2011
Posts: 80
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From: denver colorado
Burning Brakes
Joined: Dec 2015
Posts: 1,096
Likes: 322
From: Denver Colorado
"Tuning" is easy. Proper calibration of a modified LT4 involves a bit more science. Some of us went to engineering school and then spent a career learning how to do it better. But hey, if you want to trust your $20,000 engine to some guy with a free YouTube video and your own interpretation of how the control system works, by all means please enjoy.
More to the point, once you modify the airflow, you really should recalibrate the Virtual VE model in the ECM. This involves many steps to set the ECM into a mode where it is only using the one model (VE, not MAF) in open loop and then you collect data using a load bearing dynamometer and high quality wideband to determine lambda error. These recorded errors are then used to calculate a new Virtual VE surface, which in turn is used to calculate new coefficients that get flashed into the ECM to improve the accuracy of the model. After you get the errors down to less than about 5%, you repeat the process for the MAF sensor and validate the torque control model. Simple, right?
More to the point, once you modify the airflow, you really should recalibrate the Virtual VE model in the ECM. This involves many steps to set the ECM into a mode where it is only using the one model (VE, not MAF) in open loop and then you collect data using a load bearing dynamometer and high quality wideband to determine lambda error. These recorded errors are then used to calculate a new Virtual VE surface, which in turn is used to calculate new coefficients that get flashed into the ECM to improve the accuracy of the model. After you get the errors down to less than about 5%, you repeat the process for the MAF sensor and validate the torque control model. Simple, right?
I eventually ended up taking my C7 to a shop that has reputably done several C7s in the past, and had them do it, and the driveability tune seems fine, but I worry that by only doing WOT tuning on his dyno, I've got compromised closed loop tuning. It seems to drive fine, though, no surging or anything...
Thoughts?
Safety Car
Joined: Apr 2010
Posts: 4,231
Likes: 451
From: Maryland
Thread Starter
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Joined: Apr 2011
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From: denver colorado
i have the upper pulleyon my car , so im not sure but ive read that you have to raise the engine to do 18% plus you must have meth to keep the temp down