(Yes, I searched and found little useful information to that had an ACTUAL Solution. Lean Spool is Disabled and I have messed with the MAF Compensation a little already..)

EvoM Tuner folk...

I'm curious why this recent car I'm working on, when trying to dial in the AFR off the LC-1, I was seeing a large AFR error.

I More commonly tune Subaru's and on their ECU logic a large AFR error could be greatly attributed to a MAF Scaling Error, but that doesn't appear to be the case here.

The vehicle is an Evo 9 MR with STOCK Injectors and STOCK MAF, the vehicle does have Turbo intake pipe on it that is aftermarket however it is still the stock MAF.

I'm a little confused as to why I'm seeing such a large error, I am asking for 9.5 AFR Map to achieve 11.5 AFR on the LC-1.

Car is on stock Evo 9 Rom with a Timing Retard Limit hack for anti-lag launch control, no other modifications to the ROM however.

I'd be thankful if someone could point me in the right direction to go about addressing this issue...

I understand that the numbers are just numbers, however it makes it very difficult for me to visualize the fuel curve as I'm tuning when I keep seeing this awesome fuel progression for closed loop and then as soon as it switches to open loop its these horrid fat fuel values.

Any thoughts on this?

 

You answered your question.

Personally I'd put the MAF back to stock values and not worry about what the numbers are in the map. You can adjust the MAF and try to get them to line up. I read a thread that Buschur tried to do this. Basically, he ended up going back to stock MAF values.

I'll be tuning a few Scooby's soon, so I'll have the pleasure of understanding what your saying with their ECU's.

Where in CO are you?

 

I didn't exactly answer my own question I simply restated what has been stated time and time again, but I'm not looking for what it is...

I'm looking for a way to remedy the issue so I can actually tune the values to match.

I'm in Colorado Springs, Hit me up some time if you're around the same area, It be great to pick a Primarily Evo tuner's brain and if you want to pick mine on Subaru's go for it man, they run very unique logic in regards to a lot of things, boost control, knock strategy, ignition timing strategy..it's pretty awesome. Perfect car would be an Evo 9 with a Subaru ECU lol.

Can find me at www.facebook.com/dvtuning.


Regardless, I'm really wanting to find a way to make the values match so that my closed loop and open loop transition on my fuel tables doesn't look awful.

Subaru's somewhat integrate them together, but there are a lot of closed loop tables that exist entirely for that purpose, in the 0-60g/s area.

If I understand correctly, the Fuel tables on the Evo are simply that, FUEL TABLES. Regardless of which loop it's in, closed or open.

So really, I'm also going to want to lean cruise this car when I switch it to E85 here in the very near future so I'd like to have my numbers actually reflect.


I'm also curious as to the open/closed loop fueling on the Evo, the numbers in lower load cells (closed loop) are accurate to what the LC-1 dictates, so this would tell me (if it were a Sub) that the low MAF g/s and MAF(v) are correct up until say 60g/s or so where you start to transition into open loop and that the values in the MAF Scaler above 60g/s are incorrect and need to get adjusted for the AFR Error.

In which my case, almost a full 2 AFR points so, probably a significant amount of voltage on the MAF(v) table...if Evo's have one..

 

So....any thought on how to actually remedy the AFR error?


EDIT: Well here's my own thoughts now..

I'm going to be installing FIC 1250's on this car tonight... so I'll just play with the scalar until I get map AFR's closer to WBO2.

 

Been working on this lately...

Brain storming with PureDrivePeformance...I think I'm onto something..

Could definitely use some help from Tephra though to help understand some of his coding..