MAF Mystery!
 

I just replaced my CAI and immediately noticed LTFT heading up past 20%. I contacted the CAI rep and asked if they had scaled the MAF yet. He said they used the OEM MAF scale and to try that. So I paste the MAF table from my OEM tune to my favorite OFT tune and load it up. Now my car starts but won't run. So I load back up my favorite OFT tune and away I go. When I get home I decide to compare MAF scales to try and see what's wrong. Wow, the OEM table has another table at the end of it! The OEM table starts at 1.56, and the OFT table starts at .90. Look at the screenshots before replying. Please.

No mystery :-)

Tables can be rescaled which is what the oft guys perrin ect have done


see links heare to scale your own maf
http://www.ft86club.com/forums/showthread.php?t=64790

if you have a takeda intake i did a quick scale for a guy a few months ago and the scale is at end of post in link above just copy that into your tune make sure you cut/paste both rows of table else it will not work ie the volts and flow

I can see the same issue in an stock tune I have if I open it in romraider. This is likely due to newest OFT ECU definition files being used on old stock tune that used old/different definitions. You may be better off using the OFT tune and rescaling it for your new intake.

I have the Skunk2 CAI, but your Takeda MAF scale came closer than the OTS OFT tune. The 3rd one is your scale I copied and pasted in, in the hopes of having less LTFT. I'm going to the dyno tomorrow and I'll ask Wryann about scaling the MAF before we do the dyno runs.

The MAF mystery and the Anti-reversion headers sounds like a winning combination.

Yeah no mystery, you have the stock rom open with the wrong definition.

MAF mystery solved
 

I downloaded the RomRaider definitions from the OFT site and they open the stock rom just fine. The MAF table looks almost like the ones in the OFT tunes. I want to build up a tune based on the stock tune, with the lower peak torque RPM, so I need to be able to open it up in Romraider. Since the stock tune made peak torque much lower, 2900 RPM, versus OFT tunes having a consistently higher peak torque at 4500 to 4600, the lower peak torque works better for my car, an automatic. I posted in "the worlds first anti-reversion header" thread my first dyno results. I will be posting next weeks dyno results to determine which header makes the best power and torque. Now I need to learn to scale a MAF, so I can get the best power and fuel efficiency with the mods I have installed.

What's your Cal ID of the ROM?

ZA1JA00D
 

ZA1JA00D

What's the OFT D series ROM based on, ZA1JAB01D? If so, get a base stock ZA1JAB01D ROM and then hex edit it to ZA1JA00D. Then you'll avoid a definition mismatch.

2900 peak torque, or 4500, before or after the VVT shift
 

I can edit the ZA1JA00D just fine with the RR def's from the OFT site. They are in a download simply called "RomRaider XML Files [v1.x]". I want to base the tune off of ZA1JA00D because the dyno showed peak torque at 2900 RPM instead of the OFT tunes peak torque at 4500 RPM. The stock ZA1JA00D peaks before the VVT shift, while the OFT tunes peak afterthe VVT shift. The lower torque peak feels better and drives better in traffic with my car, an automatic, but I wouldn't recommend it for a manual transmission car. I'm also on the ESC list, so I want all my parts and improvements to be compatible with the ESC. The Skunk2 CAI has a removable insert in the MAF section to go from 2.5" to 3", (I think), and the elbow is removable, so the ESC can be installed in place of the elbow. If anyone wants to sell their ESC, just let me know.

It's not a case if they open or edit, it's whether the values are correct because of a crossed definition. Perhaps the way is to get a stock B01D ROM and definition (not an OFT version of either!) and use that to copy stock values into the A00D ROM.

I'm dead. :lol: :lol: :lol: :lol: :lol: :lol:

:thanks::bow:

Mate your in a very dangereous position unless you understand exxatly whats going on your going to end up bricking your ecu.

OFT tunes are often calid altered so the oft will load a tune of a later revision to your ecu, they then produce a matching set of altered definitions to match the adjusted calid tunes.

These alterations are different for V1.5x tunes and V2x tunes mixing v1 and v2 tunes and defs can end in disaster.

Now add to that stock roms which you need to use the standard romaider defs to edit and it gets more complex.

In your case i believe V1 tunes your A00D rom was probably A01D based, but for V2 its likely B01D based. unortunatly all three defs and roms you need to use are called the same name and romraider cannot tell the differeencce.

make sure which calid your actually using underrstand deffinitions check with a hex editor or its going to end in tears. if you load more than one def into romraider with the same name it does not know which one to pick it probably just picks the first one which may not be correct for your rom.

Understood. A wise caution for others out there. I'm just modifying the MAF tables though. I would like to do further mods to the factory tune, but I need more research first. The Skunk2 CAI with the stock ROM loaded is off by as much as 25% LTFT. That's with the insert. I haven't tried it without the insert yet. I need to leave everything but the header the same for this Friday's dyno runs, so I can compare the two headers, modified, and unmodified.