Why are there limits on NIOLD?

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Pontisteve
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Location: FL

Why are there limits on NIOLD?

Post by Pontisteve » Fri Mar 18, 2016 2:16 am

Looking in GUF1 at parameters NIOLD (Neutral Idle Open Loop Delay) and NIHYS (hysteresis), the description in the def warns "Do NOT set to a value of 0". I'm trying to figure out why have this warning.

Setting it to 0 would seemingly force open loop every time you entered closed throttle. That could be handy with a big cammed car to use that.

So why not set this to 0 in that case? Is there some reason we can't set it to 0, or is it more about the PCM constantly flopping into open loop every time you let off the gas for a split second?

Since the Closed Throttle Neutral Timer (CTNTMR) is clipped to NIOLD + NIHYS, that would prevent FN180 (Idle Spark Subtractor) and FN880 (Idle RPM Adder based on time in neutral) from being functional, since the CTNTMR would never upcount if you set NIOLD to 0. But that's equally as true if you set it to 1 or 2 seconds, or anything under about 240 seconds really.

Any input greatly appreciated. Thanks!
If it's worth doing, it's probably not easy.

decipha

Re: Why are there limits on NIOLD?

Post by decipha » Fri Mar 18, 2016 5:36 am

the ctntmr doesnt up count on auto cars, and the temp threshold has to be exceeded as well

in the a9l2 i have it re written to use the closed throttle tiner so its always functional regardless, i set it to 0 with that to force open loop at idle for those with stupid cams or long tubes

POPSRACING
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Re: Why are there limits on NIOLD?

Post by POPSRACING » Sat Mar 26, 2016 8:55 am

PROCESS
STRATEGY MODULE: FUEL_OLFLG_COM2


FLG_OL_320A = 1 -------------|
|AND -|
OLTMR >= HLDTM1 -------------| |
|
FLG_OL_337 = 1 --------------| |
|AND -|
OLTMR >= HLDTM2 -------------| |
|
FLG_OL_338 = 1 --------------| |
|AND -|
OLTMR >= LLDTM --------------| |
|
APT = 1 ---------------------------|OR --| Open Loop Fuel desired.
(wide open throttle) | | OL_DESIRED = 1
| |
WRMEGO = 0 ------------------------| |
(Cold EGO sensor) | |
| |
PPCTR < PIPNUM --------------------| |
(Decel Fuel Shutoff) | |
| |
CTNTMR > NIOLD --------------| | |
(Neutral idle) |AND -| |
| | |
CTNFLG = 1 ------------------| | |
| |
IDLTMR > OLITD1 -------------------| |
(Drive idle) | |
| |
CHKAIR = 0 ------------------------| |
(Thermactor Open Loop) | |
| |
HSPFLG = 1 ------------------------| |
(High vehicle speed limiting) | |
| |
HALF_FUEL = 1 ---------------------| |
(alternate injections cut-out) | |
| |
NO_FUEL = 1 -----------------------| |
(all injectors cut-out) | |
| |
LDFLG = 1 -------------------------| |
(Lugging mode) | |
| |
FLG_OL_VS = 1 ---------------------| |
| --- ELSE ---
|
| Closed Loop Fuel desired.
| OL_DESIRED = 0
Owner Core Tuning (Binary Editor)/ Moates / TwEECer / SCT Dealer /Diablosport / Drewtech
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POPSRACING
Professional Tuner/Shop Owner
Posts: 618
Joined: Fri Mar 20, 2009 11:58 am
Location: Rochester, NY
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Re: Why are there limits on NIOLD?

Post by POPSRACING » Sat Mar 26, 2016 8:57 am

Another screenshot....
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Owner Core Tuning (Binary Editor)/ Moates / TwEECer / SCT Dealer /Diablosport / Drewtech
EFI Calibrator Build custom strategies for B.E.
Land and Sea chassis dyno
Phone 585-802-6911 EST Email Adam@CoreTuning.net
http://www.coretuning.net for your tuning software needs...
1995 Cobra, 408, sold...

2013 5.0 Racing Red Automatic Tunes available...

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