PCM_EEL definition file
Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
Definitions are only $20 from Tunercat, so why even bother asking for a file that requires a code to unlock? Contact tc@tunercat.com
Thread Starter
Advanced
Joined: Sep 2012
Posts: 95
Likes: 3
From: Johnson City Tennessee
Well, I don't recall requiring a code to unlock any of my TC definitions. And yes, additional defs are approx $20 but if you look at their site, they only list $EE which includes $EEB. I know they supplied a few registered users (which I am) with the EEL def (not sure if they charged them or not). I sent an email to TC yesterday but it's a long weekend and I probably won't hear from them for a while. I have no problem paying any cost to them for the def, I'm just in a spot right now and was hoping to save some time.
Thanks for your .02
Thanks for your .02
Safety Car
Joined: Sep 2001
Posts: 4,157
Likes: 554
From: Glenbeulah Wi
The newer EE cars 1994 -1995 LT1's will update the WOT fueling based on your long term fuel trims. If the car is adding 10% fuel at part throttle and you go to WOT it will add the 10% on top of your WOT fueling possibly creating a very rich condition. The WOT locker locks your BLM's at 128 at WOT so no additional fuel is added in at WOT besides your WOT adders. This eliminates the chance for overly rich WOT runs and allows your tune to be off slightly at part throttle.
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Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
Of all the datalogs I've ever seen with 90 thru 92 speed density systems as soon as the criteria is meet for power enrichment the blm defaults to 128 and uses the VE table only. It would be my observation that modified blm's are ignored in these systems.
Racer
Joined: Aug 2009
Posts: 337
Likes: 6
From: Kanata ON
Interesting. I did some more searching on this and it seems like the best answer is some PCMs use BLMs under some circumstances.
It seems like if the BLMs are high then they are used, otherwise 128 is used.
This thread had some information:
http://forums.corvetteforum.com/c4-s...ms-at-wot.html
as did this site:
http://para.noid.org/~lj/PCM%20Tutorial/PCMtutorial.htm
It seems like if the BLMs are high then they are used, otherwise 128 is used.
This thread had some information:
http://forums.corvetteforum.com/c4-s...ms-at-wot.html
as did this site:
http://para.noid.org/~lj/PCM%20Tutorial/PCMtutorial.htm
Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
Let me attempt to make some sense of this even if i'm almost 99% positive L98's did not use blm averages.
First, in closed loop the ecm is reading from the o2 and constantly adjusting to an afr of 14.7. Once the ecm sees a loss of vacuum greater than 91.9 kpa and a tps greater than 70% ( some tps were 50%, and this can be modified, but making the point is more important than each value) it enters into pe and ignores the o2, adds a % of fuel to the ve table the blm adjusts from and runs a much richer mixture around 12:1 afr. Rarely, would an engine see almost zero vacuum with less than 70% tps tip in to operate in closed loop at 14.7 afr for the blm to adjust to! Therefore, this is somewhat of a moot point.
The moron in the thread you posted who claimed his blm's ran high at 150 had undersized injectors, or to low of fuel pressure. Not to mention a lack of understanding of how these systems function. Blm's should always run close to 128, and being at it's programmed extremes means somethings out of tune.
It sounds like some LT1's may have this capability you mention, but as I've said it shouldn't be a factor. The narrow band o2 can be used to tune wot, but isn't completely accurate and 20 to 30% of what you see will be whacked out, but that leaves a good portion to tune to .860.
First, in closed loop the ecm is reading from the o2 and constantly adjusting to an afr of 14.7. Once the ecm sees a loss of vacuum greater than 91.9 kpa and a tps greater than 70% ( some tps were 50%, and this can be modified, but making the point is more important than each value) it enters into pe and ignores the o2, adds a % of fuel to the ve table the blm adjusts from and runs a much richer mixture around 12:1 afr. Rarely, would an engine see almost zero vacuum with less than 70% tps tip in to operate in closed loop at 14.7 afr for the blm to adjust to! Therefore, this is somewhat of a moot point.
The moron in the thread you posted who claimed his blm's ran high at 150 had undersized injectors, or to low of fuel pressure. Not to mention a lack of understanding of how these systems function. Blm's should always run close to 128, and being at it's programmed extremes means somethings out of tune.
It sounds like some LT1's may have this capability you mention, but as I've said it shouldn't be a factor. The narrow band o2 can be used to tune wot, but isn't completely accurate and 20 to 30% of what you see will be whacked out, but that leaves a good portion to tune to .860.
Last edited by MrWillys; Apr 22, 2014 at 10:53 PM.
Racer
Joined: Aug 2009
Posts: 337
Likes: 6
From: Kanata ON
Here's another thread about an old TBI PCM which indicates this happens on those motors too:
http://www.fullsizechevy.com/forum/g...-i-ecm-pcm/PCM -tbi-tuning-guide.html
In PE mode: Learn is turned off and the INT is locked at 128. If the BLM is < 128 it is ignored (128 is used). If the BLM is >= 128 it is then used. The upper BLM RPM limit is only used during learn. IOW, no learning takes place above that limit (such as above 3600 RPM).
http://www.fullsizechevy.com/forum/g...-i-ecm-pcm/PCM -tbi-tuning-guide.html
In PE mode: Learn is turned off and the INT is locked at 128. If the BLM is < 128 it is ignored (128 is used). If the BLM is >= 128 it is then used. The upper BLM RPM limit is only used during learn. IOW, no learning takes place above that limit (such as above 3600 RPM).
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
1986 Corvette. One more data point...
I noticed when I did some recent data logging that the BLM always went to 128 when it was open loop. I didn't know it did that and I always thought it used the BLMs as a basis for calculating injector pulse width.
My recollection is that the ECM considers anything over 70% TPS as WOT. I think I saw 50% mentioned in one of the links (he was guessing), but I remember 70%.
I noticed when I did some recent data logging that the BLM always went to 128 when it was open loop. I didn't know it did that and I always thought it used the BLMs as a basis for calculating injector pulse width.
My recollection is that the ECM considers anything over 70% TPS as WOT. I think I saw 50% mentioned in one of the links (he was guessing), but I remember 70%.
Racer
Joined: Aug 2009
Posts: 337
Likes: 6
From: Kanata ON
1986 Corvette. One more data point...
I noticed when I did some recent data logging that the BLM always went to 128 when it was open loop. I didn't know it did that and I always thought it used the BLMs as a basis for calculating injector pulse width.
My recollection is that the ECM considers anything over 70% TPS as WOT. I think I saw 50% mentioned in one of the links (he was guessing), but I remember 70%.
I noticed when I did some recent data logging that the BLM always went to 128 when it was open loop. I didn't know it did that and I always thought it used the BLMs as a basis for calculating injector pulse width.
My recollection is that the ECM considers anything over 70% TPS as WOT. I think I saw 50% mentioned in one of the links (he was guessing), but I remember 70%.