I have also decide to quit playing with LS - I like my AFR's to be predictable...

I tried a few diferent settings and I wasnt happy with it...


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The AFR is as predictable as you tune it, from what I have seen so far.

It's made a nice little difference on my car and I'll definitely be leaving it active. With 91 octane, I can't lean out the AFR much and keep the motor happy in 3rd and 4th. With lean spool, I can get the lower gears half a point leaner but still keep 3rd and 4th happy.

Any chance there is some ignition advance also tied in with this? I guarantee I could add a couple degrees in the lower gears and really spice up the low end.

Also, since it really has nothing to do with spool and it looks to be basically a WOT enrichment timer, we should consider renaming it to something more fitting.

 

Yeah, I was thinking a rename would be appropriate as well. Its not specifically a WOT enrichment/enleanment (depending on how you look at it), so perhaps a slightly more broad name is needed.

 

Agree name not ideal.

Bit busy to look at the log in detail, but I got a log today that included a few runs through 2nd and 3rd from 2000-7500 RPM approx.

We need to try to work out when it steps to 255 when you lift off and other times it just starts to decrement when you lift off.

 

Before getting the log, did you by chance set all the decay time step values to the same number to make it independent of RPM? If yes, what hex/dec value did you use? That would make it much easier to determine the time step scaling.

 

My values are completely stock. I see your idea though.

 

I seem to have an odd thing (AFRs getting richer) after a few pulls -- by ~0.5 - 0.7 pts. I have read about folks having trouble with "lean spool" and richer AFRs in higher gears, but I have never experienced changes more than 0.1 - 0.3.

Atfer reading this thread and a few others, I believe the change occurred because I leaned my car up a bit and the "lean spool / enrichment" feature kicked in. My AFRs were consistent 10.8 - 11.1 (running Meth and a lot of boost). Then I leaned the AFRs (in 3rd gear) to 11.2 - 11.8, but found in 4th and 5th gear I was getting richer AFRs (whereas before they would stay constant running ~11.1).

My question is, do you think the "spool / enrichment" feature actually only kicks in if the car is running loads > X and AFRs > 11.5 for a few seconds? I wonder if the car "knows" or "believes" the engine is getting too hot?

Maybe I should not worry about it because the car is not knocking, is still a lot leaner than the factory designed, and is within 'acceptable range' from what I have read. Thoughts?

 

After correcting my LS tables and removing all of the duplicate junk I had in my XMLs, i decided to turn on LS again. Much to my liking the car was much more responsive. I guess the LS does in face help if I have the correct tables.

Now my WOT pulls are almost exactly 1 full point leaner than those posted in the fuel table. I am, however, getting a bit too lean from 2500 to 5500. Could my LS AFR settings be off a bit???

 

Appauldd -- I would not change the LS table, rather just adjust your Fuel Maps now that you are utilizing LS.

 

What I meant is that the LS AFR table for me was all messed up. I used some (guesswork) information from reading tons of posts to get the LS AFR values close.

If someone with a stock 94170015 could post the correct LS AFR values, I can compare where I am "off" and make the appropriate corrections.

I understand that I can change the Fuel table, and have done so in the mean time.

Thanks for the input.

 

Have folks just tried changing the Accel Enrichment values (reduce) to decrease the amount of fuel added when the lean spool / enrichmet kicks in ? Seems to me this would be an easier way to address the tendency for the car to run richer than planned .... JCSBanks / MrFred / Tephra ???

 

The accel enrichment tables are not what they seem. I've not had chance to disassemble them yet.

 

I still beleive that tuning the lean spool AFR map is worth while because if you remap the main table around the lean spool feature, you are missing the point of the "lean spool" function. Lean spool seems to be a feature meant to deal with heat being built up in the motor. In my mind, the main fuel table is almost a "worst case, I've been beating the hell out of the car for a while now" table. Leave it fairly conservative so that you could run flat out on the map and not run into a dangerous tune. It makes for a very conservative tune on short sprints though, and this is where the lean spool function seems to come in.

Tune the lean spool settings to lean out the car for those first few seconds of acceleration where everything is cool and less likely to detonate.

It makes a pretty signifigant difference in how peppy the car is around town but still keeps the tune conservative for when you are really abusing the car. On better fuel, it may not matter, but on 91 octane, I'm surprised how much leaner I can run it in the lower gears while still keeping the heavy loads of 3rd and 4th on a safe tune with LS enabled. I can keep 1st and second in the mid 12s at full load without a problem now but still have 3rd and 4th sit in the low 11s. Where with it disabled, the car would knock like crazy at anything leaner then 11.5:1 in the main map but would make 1st and second fall into the high 10:1 range.

 

I am now in the same boat as you. Leanspool sure makes the car a blast to drive. It acts like it wants to stay in boost all the time. Even on the highway in 5th cruising; a mash of the gas and boost is instant....making for the easy pass.


Your lean spool AFR points are pretty darn good.

 

Hi Mrfred,

For EDM ROM is better to disable lean spool in Ecu Periphery1 FBA bits?

I have at the bit 0 cell value is 1.

It means that is enable yes?

For me is better to disable it?

Im not using different gasoline or something like that

Thanks