Originally Posted by senate6268

Here's my values from my 96420008 ROM with 440's and 501 MAF:

Originally Posted by senate6268

Those wanting to perform a 482 MAF swap on a non-turbo Lancer, you can use the values shown here, from a 2005 Eclipse GTS, as a starting point for your Lancer's ROM:


You can see that the values for the 482 MAF are sort of in between the values for the 2.4L 4-cylinder non-turbo 501 4G64 Eclipse MAF and the 2.0L 4-cylinder turbo'd 399 Evo MAF. To get this MAF to work on a non-turbo Lancer, proper datalogging and tuning will be required to adapt it to your individual engine setup.

Those with turbo'd Lancers performing this swap will see an easier transition as the HP rating and airflow of the engine the 482 MAF came from is pretty similar to that of a turbo'd Lancer.

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If your Lancer is turbo'd and you are opting to swap to an Evo 399 MAF, you can use the values from a 2003 Evo, shown below, as a starting point for your Lancer's ROM:


Values shown above for the 482 MAF can also be used as a starting point for Lancers if the Evo's 399 MAF values gives your engine idling issues.

Same steps and changes in EcuFlash apply for this MAF swap.

Big thanks to darkmitsu for all his help with this writeup. Additional reference pulled from the following sites:
http://wnydsm.seelbinder.org/viewtop...a7ec78802486a2
http://www.galantvr4.org/ubbthreads/...fpart=all&vc=1
http://www.dsmtalk.com/forums/showthread.php?t=202358

Originally Posted by senate6268

Copy the values for a 501 MAF (or take my 501 MAF values that are more aggressive up top) and start from there. The 4G64 engine is like the 4G94 engine enough to let the values work right. From there you can adjust the MAF scaling to get your car dialed in higher in the powerband. Using the 399 MAF values directly isn't the best idea since they are made for the 4G63. You'll find your best tune with values extrapolated between the 501 and 399.

Quick question - did you have your engine tuned for 440's and stock MAF or 501 MAF or did you install both the 440's and 399 MAF at the same time?

Originally Posted by JRR

i tuned the car for the 440's with the 501maf originally.

so even tho i have the 399 in the car now, start with the 501 scalings and up it from there to bring it into the powerband?

josh

Originally Posted by senate6268

Correct. I wouldn't recommend messing with the lower Hz values though, just mid to upper where the airflow will have higher velocity.

Originally Posted by JRR

ok so do i just mess with the scaling table or mess with all of them?

josh

Originally Posted by senate6268

You're gonna want to tune the MAF scaling, but not in the lower Hz. I would also set the MAF size to the 257.7 of the 501 MAF and then move that value up once the tune is stable.

Originally Posted by JRR

do i do anything with the sensor filtering settings as well?

josh

Originally Posted by 03lances

So a little off subject but right now I have all the stock 399 maf settings and my latencys adjusted, my car idles and drives fine but I am hitting loads like I have the evo ecu in. Highest of 158?? Is this due to the maf settings I have? This is causing me to go wayyyyyy rich (below 10) when I first hit the throttle. Then closer to redline I get the closer my afrs get to the 11.5

Originally Posted by JRR

tried both your values and the stock 501 values and it idles a tad better but the driveablitly has gone wacko. like on the base 501 it will go super lean to THEN coming back out and into normal values on the wideband and i experienced that as well with your values. for driveablity standpoint the 399 is the way to go but the idle isnt there.


josh