Does the basic, mail-in flash mostly come into play at WOT or are there benefits to be had at part-throttle, as well? TIA.

 

Most of the tuning is under 5 psi and above boost operation

There are some small items that i adjust which effect partial load and cruise conditions

 

Thank you for a quick reply. As don't use WOT very often, the basic flash may not be of substantial benefit to me. Am I understanding your comments correctly?

 

If you don't go WOT often, then the Evo is not much use, as that is the only time you'll make full power and full boost. I recommend going WOT at every feasible opportunity.

Yes, any tune at your stage will only change the open loop maps, which are used at high throttle. There is no real performance at part-throttle, and there are only maps for closed loop (idle & low throttle) then open loop (high throttle * WOT).

 

I drive the Evo on the street. I tend to open the throttle gradually/linearly per road conditions - smoothness and all that. When I toss the car into a corner, I usually go in relatively fast - a byproduct of autocrossing a ~90whp car - and typically it isn't very safe to come out on WOT. I suppose I could go in slower, but that wouldn't be as much fun for me. I do put it to the floor when I can, perhaps a few times a day.

Does the ECU see WOT only when the pedal is pressed to the floor?

 

how come some reflash users report better gas mileage after a flash? is this just a placebo effect?

 

probably because the EVO's run rich from the factory, and the tune leans it out

 

but if it's only tuned at WOT, how would you notice a change in fuel economy unless you always drive around with the pedal to the floor?

 

its not only tuned at WOT, didn't you even read above where it says "Most of the tuning is under 5 psi ..." which definitely is not WOT.

 

i thought al meant most of the tuning is done "under 5 psi and above" as in most of the tuning is for 5+ psi, not 5psi and under. he said there is only some small items he messes with for part throttle which leads me to believe my assumption is right, but i could be wrong. i do know how to read though, comprehension is the key.

 

That's what I didn't really understand. If most of the tuning is indeed under 5 PSI, then this may be something for me to consider, as I don't have much of an issue with the power at higher levels of boost. Actually, I'm more concerned with TQ than HP. Al, would you mind shedding some light on this?

 

FWIW, that's what I took it to mean, too.

 

That makes no sense after re-reading it, how can something be under 5 and above? that makes no sense to me at all, either its under or above, not both. Maybe someone else knows.

 

It was just poorly worded. He used the word "under" as a figure of speech kinda like:

"I was UNDER the impression tuning is only done on the high-throttle open loop maps..." or
"Under these conditions, 5psi and above, the flash tune comes into play, but not below 5psi."

There is absolutely no reason to mess with low throttle settings, because that's where the ECU is constantly trying to maintain 14.7 AFRs for the best fuel economy. There is no performance that low, and torque is only going to come from hammering the boost, not from steadily increasing the throttle. FJF, you may have the wrong car if you want to drive that way. The Evo is meant to be thrashed at all times - maybe you just need to see how I road race and autocross the Evo to get you out of your 90whp habits.

Hondafan, you're right, the stock rich tune is only in open loop, and that is what is fixed. Nothing is changed in closed loop, so I have no idea how people get better gas mileage unless they were at WOT all the time previously and are now also at WOT all the time, but benefitting from the non-rich open-loop tune.

 

If you want more power, just push the pedal in all the way