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AE is open or closed loop?

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Old Sep 13, 2004 | 04:49 AM
  #1  
conv90's Avatar
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Car: superrammed V
Engine: 396 SBC Speed Density
Transmission: 700R4
Axle/Gears: Dana44 3.45
AE is open or closed loop?

I'm asking this because looking at a datalog csv file I can't see (during AE) any increase in fuel. The Target AFR is always 14.73.
When WOT , I can see the Target AFR going to 11 range due to calculation by the table "PE change to AFR vs. RPM", but when in AE situation I can't see any fuel adjustement.
I'm not searching to see the REAL AFR when I push the gas pedal enabling AE (I will need a WB...), I'm searching to know IF AE comes when I have a TPS fast increase.
AE tables and constants are stock in my $8D.
I'm suspecting to NOT have AE shots because every time I push the gas pedal (enabling AE) I have knocks retard and the additional fuel (maybe not added) can be the answer..
Thanks
-Beppe-
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Old Sep 13, 2004 | 10:54 AM
  #2  
Dave_Jones's Avatar
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From: Ft. Leavenworth, KS
Car: 83 TA, 89 TTA, others
Engine: ZZ4 TPI, LC2 turbo v6
Transmission: several, mostly broken
Don't bother looking at Target AFR for AE.

Look at the injector pulsewidth instead -- you should see the injectors stay open quite a bit longer for a moment after a TPS increase. You should be able to see this quite clearly, even with stock AE settings.

If you've modified your engine much at all, it wouldn't be too surprising to find it now needs more AE than what the stock settings provide.
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Old Sep 14, 2004 | 03:09 AM
  #3  
conv90's Avatar
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Car: superrammed V
Engine: 396 SBC Speed Density
Transmission: 700R4
Axle/Gears: Dana44 3.45
Originally posted by Dave_Jones
Don't bother looking at Target AFR for AE.

Look at the injector pulsewidth instead -- you should see the injectors stay open quite a bit longer for a moment after a TPS increase. You should be able to see this quite clearly, even with stock AE settings.

If you've modified your engine much at all, it wouldn't be too surprising to find it now needs more AE than what the stock settings provide.
After a TPS increase the Injector Base Pulse Width in mSec DECREASE!
TpS IPW RPM MAP Int BLM Knock retard

0,71 0,57 1250 23 128 124 0
0,73 0,55 1250 24 128 124 0
1,16 0,27 1300 45 128 124 0
1,33 0,19 1700 67 128 124 0,2
1,37 0,18 1800 70 128 124 0,9
1,35 0,19 1850 69 128 124 0,4
1,31 0,21 1800 67 125 124 0,2
1,16 0,24 1800 59 122 124 0

From 0.73 volts at TPS to 1,16volts an AE should occurs!
The base pulse width decrease from 0.55 msec to 0.27
I have a problem?
Let mr know if you need some others data.
Thanks
-Beppe-
-EDIT- I think I'm a stupid ... if the the base pulse width decrease, it means that the injectors are delivering more fuel... right?- EDIT-
EDIT2- Is there some problem with BPW on tunerproRT? Should not be HIGHER when the ECM is adding fuel?
If the WIDTH is greater it's stay open more...
my csv file At WOT says BPW from 0.008 to 0.1 msec
and up to 1.15 with 0% TPS
I'm confused... RRob? Mark?EDIT2-

Last edited by conv90; Sep 14, 2004 at 04:33 AM.
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Old Sep 14, 2004 | 05:50 AM
  #4  
gta324's Avatar
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From: sweden
Car: GTA -89
Engine: Blown 415"
Transmission: 4L80E
Axle/Gears: Strange 12-bolt
The BPW usually is around 2mSec at idle and up to 10mSec at wot (depending on inj size and so on).

There is def. something wrong with the scan....

/N.
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Old Sep 14, 2004 | 09:10 AM
  #5  
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From: STL area
How long does it take you to go WOT? The data you provided looks like you are slowly applying the throttle... maybe too slow for an AE event to occur. I'm fairly sure AE works both in closed and open. But, WOT AE "turns on" right when blms are turned off..
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Old Sep 14, 2004 | 09:28 AM
  #6  
conv90's Avatar
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Car: superrammed V
Engine: 396 SBC Speed Density
Transmission: 700R4
Axle/Gears: Dana44 3.45
Originally posted by 11sORbust
How long does it take you to go WOT? The data you provided looks like you are slowly applying the throttle... maybe too slow for an AE event to occur. I'm fairly sure AE works both in closed and open. But, WOT AE "turns on" right when blms are turned off..
This is not a WOT scan.
I think that AE can help also (and can be turned ON) on fast/quick Delta TPS without going PE.
If I do a WOT (for sure i will go to AE mode) but I will go also in PE mode so the commanded AFR will go to the 11.0 range.
I was thinking that using a DELTA TPS (not enought to enable PE) that allow for some AE shot was simply visible on a datalog file.
For this reason i was thinking to see some different commanded AFR than 14,7 durin the AE event.
The BPW suggestion is a good advice, but it seems working in a "reverse" mode in my TunerProRT scan record. (Higher value for LESS fuel and lower value for MORE fuel)
Maybe the factor in the ALDL Sensor data for the Inj. Base Pulse Width is wrong in the 1227730.ads file?
Thanks for the help.
-Beppe-
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