+1

So to touch on a couple point that have been posted so far by both dan l and razor,

Turn off the lean spool crap and you will be much more consistant gear to gear. I just did this a few days ago and saw an imediate drop in my afrs by almost a full point in 3rd gear pulls. Now all gears are very consitant. This allows you more control of the afr since you are not working against the ecu's logic any longer.

Also, by fine tuning your fuel map and getting rid of any large jumps (like those ones going from mid 9's to low 10's in the space of 20 load points) you will also gain more consitency. I have rescaled my rom so that I have 220, 230, 240, 250, and 260 load, so with my setup, I don't vary afr target numbers by more than 2/10ths from one load cell to another, in most cases it is only 1/10 th.

As far as how to disable it, I set the enable and disable point to the same rpm (2500). This is for an 03 8 rom though. Not sure about the 9's.

 

Just an FYI of how I tune my eclipse (evo's are similliar but the eclipse is MUCH more powerfull than any evo I've tuned). After about 200 grams/rev (you guys call it 200%) my AFR map is set to 12.0 from 0 rpm to redline in all cells. The car runs 12.6 AFR above approximatley 10psi boost and my peak boost is about 32psi in that car. I basically take the car from mid 14 target AFR at low loads and slowly interpolate the values to get me mid in the mid 12's. This was on about a mid 400 whp car on a stock motor.

 

Question:

Is 'lean spool' "Boost Enhancement (Anti-Lag) Start/Stop RPM" ?

 

When I looked at the definition for the 94170008 rom and compared what was posted about Lean Spool, it appeared to be the same as the lean spool data locations..

I made this comparison awhile back so I don't recall if anything has changed..

 

That is what I want to know???? I looked at my rom and the anti-lag begins @ 2500 rpm and ends @ 4531 rpm. If this is the "lean spool", then how does it affect the 4531+ rpm range if it ends there My issue is in the richer AFR in 4th gear vs third gear AFTER 5000 rpm. That is where the car is 0.5 AFR richer in 4th than in 3rd.

 

Dan / Others -- Is this true? If so, why would folks do this on a street car? Thanks

 

As far as I can tell, someone else mentioned its a "timer" based function, not sure if we know the location/setting for the timer itself if thats the case. But If thats actually true, then thats a "window" where if you hit the required RPM and Load that falls into that window, it will operate the lean spool algorithm.. That is the only "Logical" answer I can give you without the rom disassembly being complete.

 

Well, it makes sense, Lean spool is there for a reason... Its designed to keep from dumping gas into the engine before peak boost is hit.

By spooling on the lean side, you increase the rate of spool as the more complete burn generates more exhaust gas and higher velocity.

To tune the car, you probably would want to disable it while tuning, then re-enable it later and touch it up in areas..

You don't want to spool the turbo with the same AFR's you would get at peak load/torque.. The engine just can't use that much extra fuel under low load..

Lets presume the lean spool maps for fuel are the correct maps, then the map shows an entire sea of 14.7, with the area in very low load (80-130 or so) as pretty lean, 16.0, or more, tapering to 14.7 at higher load.. Try adding a bit of fuel to that map (back up your old map) and see if that helps without hurting the cars performance.

There is some confusion if that map is actually a lean spool / "Anti Lag" map, or a closed loop map, so keep that in mind..

FWIW this doesn't seem to be very relevent to the posters original question though. As the only overlap I can see is his RPM's where he's testing from in different gears are hitting the lean spool window and kicking in while he's tuning. In reality the car is being loaded unnaturally doing "dyno pulls" in different gears from 2000rpm through redline, where in real driving, you will likely always be shifting above the lean spool cutoff RPM (4000rpm or more)

 

I have been testing this out alot lately and it looks to me as if the lean spool/anti lag map is directly indexed by the anti lag start/stop rpm points. Thing is it only uses the anti lag map during closed loop operation. Also your low octane fuel map is also referenced during closed loop. I found that out by trial and error.

 

I'm actually not surprised by that, as my experiments with closed loop tables (the one that turns up on the Anti-lag fuel map) does indeed alter some of my closed loop values.

I also noticed that there is a Table that references voltage (3v or so) which may be the cutoff voltage where its automatically disabled..

Its kinda difficult to determine this stuff inferrentially so there's always room for more info.. But your observations are also similar to mine..

There is never any disagreement on the window (RPM Start and stop for anti-lag) only it was brought up that there was a timer involved, and this may actually be a window where the function is triggered, and still functions on a timer for duration.

Low octane fuel map makes perfect sense, I've seen this in closed loop after spending awhile trying to figure out why my fuel trims weren't changing..

(BTW Still trying to find a project 2000+ 2.4 Eclipse to do an Evo engine swap on)

 

Anti-lag and lean spool are not the same thing at least in my 03 0008 rom. My lean spool enable was 2500, and disable was 7000. Some folkes were refereing to the disable point as "high rpm injector pulse width step" the disable point is responsible for the afr nose dive as you cross over teh 7,000 rpm point.

The antilag setting in my rom are still the values you mentioned above 2500 and 4531. I do not think these are used since we have no antilag hardware.

Anyway there are timers associated with the lean spool stuff too so that could explain some of the difference from gear to gear since you spend a longer amount of time in the higher gears, the timer may expire sooner and cause you to go richer.

As I said before, when I disabled lean spool, my afr's got richer (in fact now that I think about it, the afrs in 3rd kinda became the same as what i used to get in 4th) and more consitant.

I see if I can find the info I used for my rom and post it up.

But, I could be totally wrong.

 

This is what I added to my defs:

 

My concern with your point is the settings your talking about, might be the settings for the pump voltage relay, as the relay also comes on at 2500rpm and I haven't found this specific RPM value referenced in too many places in the rom

Has anyone altered the value and watched to see if the pump voltage is boosted? That would clear that specific concern I have up. I have not done it so I don't know.

 

BTW the Anti-Lag are 1680 and 1682 in the 94170008 rom.. I think this is where I got confused..

1685 and 1681 don't look right when I entered them