I am new here so ive been settin here in the background reading and trying to make some sense of the TUNE topic.

So most of you guys are stating that unless i Add a supercharger or other power adder that i dont need a tuner or programmer for my ecu? I am currently building my first(i am a chevy convert) mustang its a 85 coupe converted to 89 efi 331 forged bottom end, gt40x heads, fmsf cam, gt40 tube intake, fuel pre reg, 24 # injectors,
bbk 70mm tb & 75mm maf, walhbro 255 pump and a stock a9 cpu. I have a D 1 Supercharger and am pulling my parts for it together to add it to the car in the fall. Can you guys give me some advice on what i need for tuning on my car when i add the blower? I know the typical things like the bigger injectors/ maf, and throttlebody but how bout the tune/tuner program? Any help would be appreciated!
Thanks, Scott
Scott,
Welcome to :SNSign:
2000xp8 and 90blueGT are making some good points in their discussion, but I don't want to jump into that debate.
Here are some other thoughts...
If you are going to take on the task of tuning your own car, then start learning the software BEFORE you add boost to the equation. First, it will give you time to learn the software and the basics of tuning. Second, it will give you a chance to hammer out any tuning issues you may have, without having to deal with the boost.
In general you want to keep the tuning basic and controlled. Making several big changes at once is how you will get in trouble.
Here is something else to consider...
Each time you add an aftermarket part to the motor, the ecu gets a little farther from being 'correct'
That isn't to say that the motor won't run, but it won't drive like stock and make the full potential of power for the parts.
Each of the following add a certain amount of error to the AFR and Load calculations in the ecu...
'calibrated' MAF
larger injectors
cam
heads
intake
The factory A9* ecu can flex the AFR by +/-12.5%. If the AFR is still out of whack after that 12.5%, then out of whack it stays.
My point is that each part added from the above list takes you closer to being out of range of the adaptive ability of the ecu.
If chosen well, the above parts will *usually* get the motor to run fairly well.
This is not a given though... and you don't have to accept the drivability issues that most folks seem to think is just part of having a built motor.
One more thought for 90bluegt-
Once you have played with the tweecer and the C&L a little you will probably find that you will have a hard time getting the KAMRF's to settle out. This is most likely due to the C&L meter being a little hoky.
The cheapest and coincidentally the BEST MAF alternative for tuners is the 90mm LMAF. This meter has better sampling technology, a more accurate MAF Transfer, and can be found for $80.
I am working out all the little details to run this on my 410w once I put the motor back together, but it has been done and ALL have reported excellent results.
Sorry for the longwinded post...
jason