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  1. #26
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    Click here to enlarge Originally Posted by lulz_m3 Click here to enlarge
    AFR, and disable lean spool toggle. Done. Keep in mind the DME is going to achieve whatever the target AFR is for LOAD ACTUAL.
    OK great.. I've tuned many different platforms before and now that ATR is out I will pick up the AP..

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    Click here to enlarge Originally Posted by lulz_m3 Click here to enlarge
    AFR, and disable lean spool toggle. Done. Keep in mind the DME is going to achieve whatever the target AFR is for LOAD ACTUAL.
    That is correct. Whether I'd disable it or not is a matter of discussion though. Personally, I wouldn't disable it on either stock or RB turbos as its there for a reason.
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    is there any feedback from people that have disabled the "lean spool"

    while i see the advantages to disabling it, i agree with DZ about it being there for a reason. i wonder if the car looses some responsiveness or gains some lag from doing so?

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    I figured it was for fuel efficiency?
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  5. #30
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    Click here to enlarge Originally Posted by bryce Click here to enlarge
    is there any feedback from people that have disabled the "lean spool"

    while i see the advantages to disabling it, i agree with DZ about it being there for a reason. i wonder if the car looses some responsiveness or gains some lag from doing so?
    I've been wondering the same thing. Is it there for performance or (maybe) emissions?
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    my guess is performance. the DI on teh n54 allows some leaner a/f ratio's

    i think when you lean out the car while it's building boost, the lower end torque and overall power output improve. that's just my theory though, no proof to this. judging by the way teh procede and jb4 make power under the AFR's they do, i'd say there's some truth to the theory.

  7. #32
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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by bryce Click here to enlarge
    my guess is performance. the DI on teh n54 allows some leaner a/f ratio's

    i think when you lean out the car while it's building boost, the lower end torque and overall power output improve. that's just my theory though, no proof to this. judging by the way teh procede and jb4 make power under the AFR's they do, i'd say there's some truth to the theory.
    I believe the idea behind "Lean Spool" is to lower timing/lean fuel in an attempt to increase EGT's as much as possible, which would provide maximum spooling potential. Alot of people are under the misconception that exhaust gas volume is the only thing that spools the turbo. Its actually the radiant energy, AKA heat, that is contained within the exhaust gas that aids in spool.

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    Click here to enlarge Originally Posted by lulz_m3 Click here to enlarge
    I believe the idea behind "Lean Spool" is to lower timing/lean fuel in an attempt to increase EGT's as much as possible, which would provide maximum spooling potential. Alot of people are under the misconception that exhaust gas volume is the only thing that spools the turbo. Its actually the radiant energy, AKA heat, that is contained within the exhaust gas that aids in spool.
    Great post, agree 100%
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  9. #34
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    Click here to enlarge Originally Posted by dzenno Click here to enlarge
    That is correct. Whether I'd disable it or not is a matter of discussion though. Personally, I wouldn't disable it on either stock or RB turbos as its there for a reason.
    Since the thread was about the lean condition at onset of WOT with piggies, I guess one might try to disable it IF you want to try to correct this and is running a JB or Procede.

    Since the boost target is going to be higher and unknown to the DME isn't there a chance that the planned "lean spool" AFR is going to get higher than the DME was aiming for here?

    How lean does a stock or COBB tune AFR curve get as comparison to the piggies?
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  10. #35
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    Click here to enlarge Originally Posted by lulz_m3 Click here to enlarge
    I believe the idea behind "Lean Spool" is to lower timing/lean fuel in an attempt to increase EGT's as much as possible, which would provide maximum spooling potential. Alot of people are under the misconception that exhaust gas volume is the only thing that spools the turbo. Its actually the radiant energy, AKA heat, that is contained within the exhaust gas that aids in spool.
    We used to do it manually on other platforms by taking out tip in fuel enrichment. Seems like the same concept only with the DME able to use the boost target and set point as criteria. I have not played with the Cobb settings on that yet but its one of those things you can tweak, measure spool speed, and repeat, to quantify if there is anything on the table there. Once you determine that then you can monitor EGT and advance post spool and decide if the gains are worth the risks.
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