I just installed my used maggie and I am having trouble getting the tune correct. I am using hp tuners. I am going lean under medium throttle. i just installed a new racetronics fuel pump and hotwire kit also have a fuel pressure gauge installed so i know the fueling is not a issue. We went through the maf and ve tuning procedure by the book. under boost i start off fine and then all of a sudden jumps from around 11- 12 up to 14-15 on the wide band. I would like to have the tune that comes with the supercharger to have a better starting point. Or if somebody would like to take a look at my tune and a log i can email it. thanks.

 

Bump. Also it's a mp112

 

I'm assuming you are still running the stock operating system (1bar, maf, closed loop)? How did the timing look where it went lean? How about calculated airflow? Map reference?

For a Magnuson file to compare, I am sure you could fine one in the HPT tune repository... https://www.hptuners.com/customers/tune.php You will have to be logged into HPT site to use it.

 

here is one I have for a 05 im not sure if its a stock magnacharger file but its atleast something to compare yours to

05 5.3l magnacharger maf.hpt

 

thanks for the response. timing was 16 degrees, map was steady at 103 calculated airflow drops. I will try to get the tune and log loaded up tonight.

 

thanks i am going to compare it to mine.

 

here is a log I did on hp tunners if anyone cares to take a look at it.

ryans gmc lean problem.hpl

 

What injectors are you using? Are you running the stock style fuel system? Return system vs returnless. What fuel pressure are you seeing on decel?

 

MP112 and TVS1900 use the same tune.

The tune should be fairly close for 2003-2005 The 06-07 Classic had some things changed in the OS Like the pedal, TAC module and TB.

EDIT: 03 is a return style and you will need the correct info in the fuel tables for that.

 

I'm using the 42# injectors that come with the supercharger kit. Upgraded the fuel pump to the racetronics with a hot wire kit. It is a return style system and it uses the stock vacuum reference regulator from the stock fuel rails. I have a fuel pressure gauge in the cab but I haven't paid much attention to it on deceleration I can check on that though.