Not everyone can build beasts like you do Bryan. Some of us have limited budgets and we rather enjoy our "slow" cars.

 

Even slightly modded stock turbo evos are over 1600hz. Even a 100% stock off the showroom floor Evo 9's can get over 1600, but of course way up top.





I haven't had the time to read most of mrfreds new fueling thread so I should probably save more input until I do that.

But just my 2 cents for now. I have never seen a Evo 8/9 have LTFT's effect WOT fueling as drastically as the Evo 10's do without that mod.



- Bryan

 

It may not be drastic, but there is an affect. Those of us that are modded enough to go above the 1600Hz value may like the results of this tweek. I like new discoveries and enjoy discussing the results.

Let's see where this new tweek goes with 8s and 9s.

 

I agree. I'm sorry if I came off sounding confrontational as that was 100% not what I was trying to be.

I need to find time to read through that thread. It's been hard to find the time.

The 10's LTFT effecting WOT was/is super sensitive. I have seen -2 LTFT almost effect WOT by .5 AFR.

I have never seen a swing like that on a Evo 8/9. I look forward to seeing just how much it really is effected on Evo 8/9's.

- Bryan

 

It almost seems like the closer your injectors are to being "perfectly" scaled the less the affect the LT has on WOT pulls. I guess i need to get back on the drawing board and try to scale my injectors better rather than using the MAF scaling and adjustment tables to pull my LTFTs into spec.

 

When I had LS active AFR was constantly changing from pull to pull, I also thought FTmid was affecting WOT, but as soon as I disabled (2500/2500 way) all the weirdness went away. Much improved now with LS off with periphery.

 

Looks like half the RPM range at least is under 1600 Hz to me???

That's pretty significant.

Your charts do show that setting it around the 800Hz level would probably be about right.

 

lol...
Ive noticed this as well, as I drive a slow car. When i had improperly scaled injectors (-4lo, -8mid) id notice that the mid range accel would run richer than the values I was seeing on the stock injectors (-3lo/+4mid). These corresponded to the 160-200 load range (~.8-1.1 bar)

i can try messing with the CL values and see if it logs a difference. I regularly drive up and down hills at 110-180load...

that thread is a hard one to understand if you get hung up on his writeup about the calculations. pretty good stuff tho. helps with the uber large injectors that are hard to nail down a solid O2feedback.

 

With lean spool on or off?

- Bryan

 

LS enabled. When I turn it off I get 'consistant' WOT pulls, but uber rich midrange stuff when its disabled(<10:1, when tuned for 11.8ish @WOT) . I figure its a misnomer, as it seems that its really there to richen you up at >6500rpm, and into the next gears.

 

Ok I am seeing a trend here. The guys with LS enabled are seeing these changes with LTFT affecting WOT.

LS will change the AFR pull to pull for sure. Not just gear to gear and upper RPM. I always tune with it off because I like control over AFR. Might be one of the reasons I don't see the LTFT affecting WOT as much as you LS users.

- Bryan

 

meh... i figure why mess with LS if we truely dont understand it. Its only used when transitioning from CL to open...which i think corresponds to what youre saying.

 

Lean spool is pretty well understood, especially with the most recent tables found for it.

It does what it says...it leans the fuel mixture based on AFR and time. Certain AFR values are matched to lean spool AFR values and only for a certain amount of time.

 

^lol, sorry. I understand that portion. Proly should have said,I don't know what reason the mitsu engineers put it in there for. General consensus is for emmisions,afik

 

I tend to believe lean spool is a fail safe. The car is tuned very conservatively with lean spool disabled. Probably conservative enough that you could put gas worse then 91 octane in and still not run into detonation on a stock car with lean spool disabled.

Lean spool then leans out the AFR in conditions where it has not seen prolonged abuse. This gets the pep back. If you beat on it for longer periods of time though, the effect wears off and it goes back to the ultra conservative tune.

I have to laugh at this idea of being under 1600 HZ equating to a slow car. You are going to be under 1600Hz on MOST setups at lower engine speeds and at mid loads where you are accelerating but not at WOT above 5000 RPM. These conditions probably make up 90% of the "spirited" driving people do.