You want to REDUCE IOP, not increase it.

^^ that makes no sense, my tunes have always been stronger when increasing IOP when you want more TQ especially in the higher end of the load scale.

And you'd get torque intervention if you bumped too much of IRL.

The effect is well documented.

The only real solution is to leave most of IRL alone, except for the top lines, and shift the axis of IOP around accordingly.

How to make this all work for your Tune
Adjusting the Optimal Torque map using 02 corrections as a guide

You MUST deactivate any corrections on your main fuel correction map, this is the pre correction map for the lambda targeting fuel algorithm and will skew results if any value but 1.0001 is present in the cell.

*Note* the values of this table compare to ACTUAL torque seen by the torque model, NOT the REQUESTED torque derived by the acceleration pedal map, I will explain the different in a different post.


*NOTE for setting up Y axis, The final column value should be the LOAD value where you car produces Maximum torque, this just happen to be the max load that my car reached... with my turbo (ported ko3s) this over shot my target filling value by 5% so while the highest value I request for load is only 200% my Y axis, last column on optimal torque is 205.5 since that is the max load my car will reach that I have seen, if it is completely unrestricted by the max VE table. This number has risen as my tune can getting more spot on, I can only assume this means I am producing more power, butt dyno agrees heavily



Do NOT fall into the trap off thinking you much adjust lower range values if you change the value of higher columns, you shouldn't have to unless you are raising the last column because of a pure 0 reading when approaching max torque, a very rare instance indeed, other wise you should not need to adjust values in lower load area's as produced torque should be the same at other load levels.

First you want to make sure there are NO recorded 0's in your datalog in the area we are going to be adjusting.

Any 0's must first be dealt with or your gonna be chasing your tail, A pure 0 is an indication of the adjustment running out of range... A BIG change will be required to bring this load and rpm point into line so that we may begin fine tuning. Use common sense with these adjustments, if your adjusting 151% load out of a max defined 200% and your opt torque value is 30%... you probably need to raise not lower to get it back scale.

*note values of 0.23 etc are perfect and infact mean your basically spot on at that point*

*NOTE* Other maps affect fuel trims so make sure you account for acceleration fueling map and it's effect on the fuel trim during sudden throttle requests. It is better to only tune portions of the opt torque map in which a steady load over a good portion of the rpm range is logged.

Now once you have no pure zero's the next step is to make sure your 02 corrections are either ALL positive or ALL negative. I shoot for negative because I rather be richer and have the ecu remove a small amount of fuel then rely on the ecu to add fuel, that's just me how I feel safer, also that's how I know I'm not "missing" out on power so to speak.

a Datalog that shows you have all the 02 correction values either positive or negative you have a choice:

Be done!, yup you could fine right here, if your getting recorded values of all negative or positive numbers your in line "enough" that the ecu can take care of the rest and you'll have a pretty decent tune.

Not be a slacker and really dial that **** in!

Okay I made a post about interpolation of points between mapped points and how the ecu comes up with these. An understand of this concept will greatly reduce your dial in time if you don't have access to an interia dyno where you can run the car at a set load through an rpm range constantly.

What your going to do is look at RPM points in the data log that you have defined on your X axis. Then check the calculated load at that point.

For MAFLESS people: *NOTE* I have not even turned the key on a mafless car let alone start to tune one this is a guess BUT I'm thinking this check would be how you would dial in your TB tables and such... You would want to make sure the calculated load matched what your spec load would be that way you know you are on the right spot on the optimal torque table. But that's tuning theory and I can't get into that atm(no time and outside of the scope of this already long and probably confusing post)

then you check the 02 correction, if it's negative your gonna to decrease the value of your optimal torque table in that cell.

Now the reason you are looking for defined RPM area's is because if you have all those in line the values in between those areas will fall in line too.

I gotta end the post here and get to class, but that's really all the basics, if you understand interpolation you can use the changing of 02 correction values to estimate what changes need to be done to cells of the map you might not have logged,

if you don't just stick to the defined values and only adjust based on calculated load, if calculated load falls between 2 defined values, average the defined values, if the calculated value is higher then average adjust the higher defined load cell, or vise versa.

Remember small adjustments are best, even with recorded zero's I would only make 5% adjustments at most

One last thing if you have Positive numbers where you have it marked as 100% opt torque(last column is the only place this is gonna happen) you need to RAISE the Y axis value of the last column! The car is telling you if produced max torque at a higher load level then the defined axis you either

need to bring the axis up and readjust the other values in the column accordingly, (you want to tune for more power)

just allow for the ecu to make that correction in that case (a positive value less then 2 in this case is probably just from the car not completely cooling down between runs and heat effecting power output)

Limit the max VE to avoid hitting that load level again ( you want to limit power produce or boost for reliability reasons etc.

damn that's longer then I expected, I'll check it over for spelling and clarity after I get back from class, post any areas of concern or questions I can help with and I will try and add the info in

Interesting. I didn't think ME7 made fueling decisions based on target torque.

Given the IOP/IRL torque intervention thread, what causes torque intervention (other than ARMD)?