Ive been searching the ecuflash section but not coming up with what i was looking for. I understand the main concepts and tuning practices for WOT throttle tuning, but what about that in between? Say 75% tps at 200 load at 4000rpms-5000rpms? What type of target AFRs should i be looking to get too, as well as timing. Drivability is just as important to me as having a rock solid WOT tune. Are there any threads i missed that discribe this in further detail, or does anyone have a nice place to start. I have read the "How to Tune an Evo" thread a bunch of times and it definitly has helped thousands of us, but didn't get into what i was really looking for. Thanks in advance for the help!

 

+1 I've been wondering the same thing

 

bump!!!!!!! i know someone has something to say

 

TPS doesn't really matter, it's all about load/rpm. 200 load is ~13 lbs of boost, so you'll still want to run it fairly rich since there's a good amount of air being pushed in. I'd say .1 or .2 points leaner than if you were at 20+ PSI at that same rpm. For example, if you're at 11.5 AFR at 4000 RPM at peak boost, then maybe shoot for 11.6-11.7 AFR at 200 load.

That being said, I'm in no way a professional tuner, so you might want to wait for an expert's opinion. I'm not responsible for anything bad that happens if you follow my advice, hehe.

I would be curious to see what experienced tuner's have to say about this as well though, because I was asking myself the same question when I was tuning the car myself.

 

^^^^ thanks for the insight.

its just something im curious about. Anyone who has looked at a dyno graph with afrs can figure out a good range for what afr they are supposed to aim for at certain load and rpm, but that in between is where im interested. I heard a saying that all the other cells in a fuel map are where a brilliant tuner really shines, so im trying to hear what the deal is! lol

 

^^ for any more input on this topic

 

Your should just smooth it. Look at the stock JDM fuel maps if your running lean spool or or some tuned fuel maps if your not and get an idea for how the map flows. The basic layout of the map should remain the same unless your doing major changes. You want to keep the fuel map smooth and make sure you don't knock.

 

Actually, the fuel map does not need to be as "smooth" as one would think. There is, in most cases, areas that use the same AFR at various RPM and Loads. For example, your top end rpm/load cell can usually can carry it's setting out to the higher load cells as well. This creates a small "ramp" if you will in the 3D view of the tune.

When you do a pull and find your peak load, this should be also the point of, or vary close to, peak boost. The actual AFR desired depends on many factors. It all comes down to what the car likes. Every "tuner" has their own method to the madness.

The general idea is something like.....
12.5-13 for spool up to about 5-8psi of boost
Then go richer to like 11.2 until you hit peak load
Then 11.5 for the rest of the pull

Timing will be paramount to making your AFR stable too.

Once you get your pull areas perfect, the idea is to then go to the surrounding cells and make the 3D table for fuel and timing as smooth as possible. It is ok to carry the same value from left to right in areas after peak load.

I know the areas you are speaking of is the transitional areas from like 100 to 200 load. Theses areas are the most difficult to tune for because of the variance from pull to pull for any given throttle position. If you tune for your pull, then smooth the rest of the table, you will be happy with the transitional areas as they will kind of work themselves out.

I am far from a "expert" but I've been around long enough to get the gist of what goes on in a typical tune.

Hope this helps.

Paul