Need help with HPT, PE table tuning (w/screenshot links and logs)
05-14-2005, 06:30 PM
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Need help with HPT, PE table tuning (w/screenshot links and logs) Hey guys, I've been logging and researching for about a month now on my 1998 Z28. I have the LTFT's within +/-4 for most weather conditions by adjusting the VE table in SD mode (MAF fail frequency @ 0), and now I've started trying to tune the PE table (also in SD mode) and have ran into something that's confusing me. The more I try to lean out the PE table, the higher the LTFT are climbing and the O2 readings are staying about the same.
With the stock PE table, during my WOT runs the LTFT's would lock to 0 in the 95-100kPa rows while the stock O2's were reading 940-950mv. As I started adjusting the PE Multiplier table leaner (towards O2 readings of 900mv), my LTFTs no longer stayed locked at 0, they started going positive. I then disabled COT and set the Open Loop F/A vs. ECT vs. MAP values to 1.0 for temps of >= 140* in the 95-100kPa rows.
It seems like the leaner I take the PE table (down to a commanded AFR of 12.7 now, stock was 11.7) the more positive my LTFTs are going and my O2 mV readings aren't really changing any more. I have them down to around 925mV right now.
Here are the links to the files in an open directory, or the direct links are below (the screen dumps are 2.2MB bitmaps). PE table changes were made across the board, meaning the -0.05 file means 0.05 was subtracted from the entire PE table:
Stock PE table - Screen dump
Stock PE table - Log
PE table -0.05 - Screen dump
PE table -0.05 - Log
PE table -0.10 - Screen dump
PE table -0.10 - Log
PE table -0.10, COT off - Screen dump
PE table -0.10, COT off - Log
PE table -0.10, COT off, Open Loop F/A @ 1.00 - Screen dump
PE table -0.10, COT off, Open Loop F/A @ 1.00 - Log
The .bin in question, latest rev. with the OLFA table @ 1.00
I thought that the LTFT's were supposed to stay locked at zero above 4000 RPMs? Or is this only when you aren't in SD mode? Is there something I'm doing wrong?
With the stock PE table, during my WOT runs the LTFT's would lock to 0 in the 95-100kPa rows while the stock O2's were reading 940-950mv. As I started adjusting the PE Multiplier table leaner (towards O2 readings of 900mv), my LTFTs no longer stayed locked at 0, they started going positive. I then disabled COT and set the Open Loop F/A vs. ECT vs. MAP values to 1.0 for temps of >= 140* in the 95-100kPa rows.
It seems like the leaner I take the PE table (down to a commanded AFR of 12.7 now, stock was 11.7) the more positive my LTFTs are going and my O2 mV readings aren't really changing any more. I have them down to around 925mV right now.
Here are the links to the files in an open directory, or the direct links are below (the screen dumps are 2.2MB bitmaps). PE table changes were made across the board, meaning the -0.05 file means 0.05 was subtracted from the entire PE table:
Stock PE table - Screen dump
Stock PE table - Log
PE table -0.05 - Screen dump
PE table -0.05 - Log
PE table -0.10 - Screen dump
PE table -0.10 - Log
PE table -0.10, COT off - Screen dump
PE table -0.10, COT off - Log
PE table -0.10, COT off, Open Loop F/A @ 1.00 - Screen dump
PE table -0.10, COT off, Open Loop F/A @ 1.00 - Log
The .bin in question, latest rev. with the OLFA table @ 1.00
I thought that the LTFT's were supposed to stay locked at zero above 4000 RPMs? Or is this only when you aren't in SD mode? Is there something I'm doing wrong?
05-15-2005, 08:54 AM
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Well, I've looked through just about every table that I think could affect the WOT AFR and can't find anything that should be adding fuel...
05-15-2005, 12:41 PM
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I'm not seeing anything specifically called WOT enable but here's the sections that I think might answer your question from the Engine > Fuel Control > Power Enrich tab:
I'm doing all of this based off of stock O2's in Pacesetter LTs... Do I need to disable PE mode, retune my VE table < 4000 RPMs, then re-enable PE for WOT tuning > 4000 RPMs? I'm planning on hooking the MAF back up after all is said and done.
Do I disable PE mode by setting the PE Enable MAP value up to 200kPa or something that will never be reached?
Code:
PE Enable MAP = 15 Hot Select Temp = 284 *F PE Enable %TPS vs. RPM - Cold = 64 64 64 64 64 64 64 64 55 45 36 26 26 26 26 26 26 26 26
Do I disable PE mode by setting the PE Enable MAP value up to 200kPa or something that will never be reached?
05-15-2005, 01:31 PM
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From my understanding, its best to dial in VE and MAF Recal together. Then go onto PE.
Did you adjust yoru PE enable? Its set for 15kpa MAP, thats sounds awefully low. Sorry I cant offer up the solution, but I am trying to learn about the same issues.
Charlie
Did you adjust yoru PE enable? Its set for 15kpa MAP, thats sounds awefully low. Sorry I cant offer up the solution, but I am trying to learn about the same issues.
Charlie
05-15-2005, 04:57 PM
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15kPa makes it seem like NoGo is correct, the PE table would be active just about all the time. I'm thinking I need to change the PE Mult. table to all 1's and go start from scratch on my VE tables.
If this is the case though, after I get the VE table in order I would need to re-enable PE with the PE Enable MAP value set to 15 again, but then tune the PE Mult table for the correct WOT and high-load values.
Man, I need to check into this some more because it seems like the PE table will be fighting the Open Loop F/A table. I need to figure out what parameters have to be met before the car engages open loop mode. Because even if I have the PE table straight for mid to high loads, as soon as I go into open loop the richer value between the PE table and OL F/A tables will be used. This means I would either need to negate some of the OL F/A table values or PE values?
Heh, I'm confusing myself again... must be the Coronas.
I think I'll have this figured out if I drink another 8-10 of them!
If this is the case though, after I get the VE table in order I would need to re-enable PE with the PE Enable MAP value set to 15 again, but then tune the PE Mult table for the correct WOT and high-load values.
Man, I need to check into this some more because it seems like the PE table will be fighting the Open Loop F/A table. I need to figure out what parameters have to be met before the car engages open loop mode. Because even if I have the PE table straight for mid to high loads, as soon as I go into open loop the richer value between the PE table and OL F/A tables will be used. This means I would either need to negate some of the OL F/A table values or PE values?
Heh, I'm confusing myself again... must be the Coronas.
I think I'll have this figured out if I drink another 8-10 of them! Trending Topics
05-15-2005, 05:47 PM
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the PCM uses the richer of the PE and Openloop tables. Likely your openloop table is set around 1.13 or something so having a PE lower than this won't do anything.
05-15-2005, 07:14 PM
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My PE table was set for 1.15 during that last log. 
And yes the Open Loop table was set for 1.13, I haven't modified it yet at all other than setting it to 1.0 for testing.
I'm thinking that my VE table might be hosed due to the PE MAP Enable being set to 15kPa. I tuned my VE table with PE mode enabled, which probably threw off my entire VE table. Could this be causing my problems? Would it be wise to disable the PE mode and then retune the VE table? At this point I'm thinking it would be my best next course of action.
And yes the Open Loop table was set for 1.13, I haven't modified it yet at all other than setting it to 1.0 for testing.I'm thinking that my VE table might be hosed due to the PE MAP Enable being set to 15kPa. I tuned my VE table with PE mode enabled, which probably threw off my entire VE table. Could this be causing my problems? Would it be wise to disable the PE mode and then retune the VE table? At this point I'm thinking it would be my best next course of action.
05-15-2005, 10:05 PM
#10
So are we saying that PE mode delay RPM commands when PE is activated even though it goes down to 15kpa before WOT, and, at wot when open loop ratio is higher (over riding PE) PE has no effect. My PE table goes down to 0rpm at 1.203 ratio??? LS1Sounds, sorry if it seems I am hi jacking your thread, just trying to make sure I/we understand this also.
05-16-2005, 05:52 AM
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Originally Posted by Robert56
So are we saying that PE mode delay RPM commands when PE is activated even though it goes down to 15kpa before WOT, and, at wot when open loop ratio is higher (over riding PE) PE has no effect. My PE table goes down to 0rpm at 1.203 ratio??? LS1Sounds, sorry if it seems I am hi jacking your thread, just trying to make sure I/we understand this also.
Originally Posted by gameover
PE Delay is disabled in all car calibrations.
Changing these numbers doesn't affect anything.
Changing these numbers doesn't affect anything.
