That's a pretty thread OP. Lots of colors. I like colors. Do you actually tune cars or do you just tell everyone that their tune is not done right? If you tune, why don't you become a paid vendor and start selling tunes?
its others like myself suggesting people to go to so they can get a tune done correctly. the OP is educating people on what to look for. he hasnt suggested anybody from what i understand. be a paid vendor to share information? great idea!!!:burn:That's a pretty thread OP. Lots of colors. I like colors. Do you actually tune cars or do you just tell everyone that their tune is not done right? If you tune, why don't you become a paid vendor and start selling tunes?
Most of this knowledge is spot on, other is dated. One example of the dated:
Correction: You can run any MAF with any injector.
Let's say you are running a stock car with 15psi of boost. You decide you want to use E98 fuel. In part you may need bigger injectors, correct? This doesn't mean the MAF has to change to match the injectors. The MAF does not need to match the injectors. The MAF does need to have enough range to measure the airflow present.
If the starting point for the air model is correct, then yes...the MAF transfer/freq function remains untouched. How many people are receiving flow sheets with the MAF they buy? I did with my Pro-M.
Some food for thought...
When I tuned my current engine combination, I started with a stock 03 Cobra MAF. I put the car down to the minimum boost setting, and worked with a stock 03 Cobra MAF transfer function. With the car having cams, aftermarket injectors, and other mods...I first addressed them knowing that the air model I currently had was spot on. With everything else addressed, I then installed the Pro-M MAF with the flow sheet that was built for that MAF and air filter, along with the data from the flow sheet into the calibration. Air/fuel and load did not change.
That's a pretty thread OP. Lots of colors. I like colors. Do you actually tune cars or do you just tell everyone that their tune is not done right? If you tune, why don't you become a paid vendor and start selling tunes?
So what your saying is if you tune the maf transfer to match commanded air/fuel, load and spark could be off???
Correct
So how would i know if my load and spark was right? I dont have or know anyone who tunes with a flow bench.
In response to our convo: would it be better to datalog the air #/min and adjust that way? guess you would need ad counts o volts as well to know where to adjust though.
also- to add to this- if you're saying that the value files for mafs in say SCT PRP aren't accurate- then where do they come from? or are you saying that they are to be left alone once loaded?
Once you load the accurate transfer functions in the tune you should not touch them period.
I'm not going to say which SCT files are accurate or not. It's the tuners responsibility to be sure he is using correct data derived from a professional flow bench.
being that I am a self taught amateur tuner using SCT PRP I have a few questions.
1. isn't tuning the maf curve via datalogged info the same as obtaining flow data from a work bench.
2. if you were to use a flow bench method what is to say that the data will hold true in the vehicle? I have seen 1/8 of a turn on a maf housing take a perfectly running car to not able to start even. and I'm talking about slot mafs, much less a non slot maf.
3. I understand the theory behind changing injectors slopes etc, just like on standalone systems, but those systems also work with VE tables that maf based systems don't have- so isn't that where the maf tables come in? thanks