Ecu Tuning
Library.EcuTuning · r1.2 · · markolson
.
Author: blundar
Date: 08-12-03 14:12
EGT (or Exhaust Gas Temp Sensor) and Wide Band O2 used in combination with Data Logging can be a really powerful tool. Timing changes produce more effects in EGT and fuel changes produce more effects on wideband. Deluded explained some basics to me but most of it flew over my head. :)
Author: Deluded
Date: 08-12-03 22:25
Blundar nailed it WBO2, datalogging, EGT , and RTP helps loads too. you are just guessing without at least the first two tools. if more timing advance is needed, it will result in a leaner O2 reading...limited by detonation. We break very few street engines with these tuning parameters:
11:54:14 AM Dave B. you have a wideband, I presume? 11:54:18 AM Synoptic. hmm 11:54:21 AM Synoptic. no 11:54:23 AM Synoptic. :P 11:54:24 AM Blundar if not, forget it 11:54:28 AM Synoptic. i need to fix civic1990si one's 11:54:31 AM Synoptic. we do that today 11:54:40 AM Synoptic. its the DIY one 11:54:54 AM Synoptic. lets say i'm gonna have one this afternboon 11:55:05 AM Blundar then put it on the car 11:55:07 AM Blundar wait 11:55:13 AM Blundar do you have a narrowband out or not? 11:55:35 AM Blundar the ECU will get pissed off about not having a narrowband 11:55:36 AM Synoptic. i have 2 o2 input on my header 11:55:43 AM Synoptic. so i'll simply add the wb 11:55:44 AM Blundar ok then you're set 11:55:52 AM Blundar drive around with the WB 11:56:04 AM Blundar you'll see what afrs you're at 11:56:18 AM Synoptic. k 11:56:28 AM Synoptic. will AFr change a lot while dringin ? 11:56:33 AM Synoptic. or it will stabilize ? 11:56:48 AM Blundar change a LOT 11:56:56 AM Synoptic. and how to i modify my afr, using te, timing, fuel? how does it ork? 11:56:58 AM Synoptic. okok 11:57:06 AM Synoptic. so how do i tune my car then.. 11:57:08 AM Blundar afr is mostly fuel 11:57:08 AM Synoptic. i'm a morron 11:57:09 AM Synoptic. help me 11:57:13 AM Blundar heheheh 11:57:14 AM Synoptic. ok 11:57:24 AM Blundar nick, I honestly don't have time to hold your hand on this 11:57:58 AM Blundar I'm trying to recover a crashed reiserfs in another window :) 11:58:03 AM Synoptic. basically, do I run at steady RPM to see what AFR it is ? average), i do that for all RPMS, tak enote, enrich, then try again ? 11:58:13 AM Synoptic. i love linux 11:58:18 AM Blundar its much more difficult than that 11:58:32 AM Blundar because you won't be able to hold a steady RPM @WOT without a dyno 11:58:37 AM Blundar you'll be able to do a pull 11:58:49 AM Blundar start at low RPM in e=3rd or 4th geat 11:58:53 AM Blundar floor it 11:59:01 AM Blundar watch the AFRs as you gradually accelerate 11:59:04 AM Blundar watch tach 11:59:13 AM Blundar you'll see it change wtih RPM 11:59:21 AM Blundar make some changes to fuel, observe changes in AFR 11:59:24 AM Blundar repeat 11:59:36 AM Synoptic. k 11:59:38 AM Synoptic. ok 11:59:39 AM Synoptic. i get it 11:59:41 AM Blundar you'll quickly learn how much to change fuel to get disred afr 11:59:49 AM Blundar start relatively small 11:59:52 AM Synoptic. then engine need to have force applyed.. 11:59:58 AM Blundar you';d be amazed what 3-5% will do 12:00:03 PM Synoptic. kk 12:00:09 PM Synoptic. keep stock timing 12:00:15 PM Synoptic. then adjust if i hear detonation 12:00:23 PM Synoptic. but if i put more fuel, i should advance it 12:00:25 PM Synoptic. i know that 12:00:34 PM Synoptic. timing will only change the powerband curve, right ? 12:00:45 PM Blundar timing will change everything 12:00:48 PM Blundar nail your fuel first 12:00:52 PM Synoptic. ok 12:00:53 PM Blundar then go back and play with timing 12:00:54 PM Synoptic. stock timing 12:00:56 PM Synoptic. stock pressure 12:01:00 PM Synoptic. go for fuel 12:01:01 PM Synoptic. then 12:01:03 PM Synoptic. timing 12:01:05 PM Synoptic. then 12:01:08 PM Synoptic. pressure 12:01:14 PM Blundar yessssssss 12:01:15 PM Synoptic. kk 12:01:18 PM Blundar pretty much 12:01:19 PM Synoptic. k 12:01:38 PM Synoptic. and floor it on 4th or 3rd so rpm doesnt go up super fast and ngine stil have a load. 12:01:50 PM Synoptic. that will do a base tune.. 12:01:59 PM Synoptic. and with that i could go on a dyno. 12:02:00 PM Blundar yeah 12:02:02 PM Synoptic. kk 12:02:03 PM Synoptic. i get it 12:02:04 PM Blundar that will do WOT 12:02:07 PM Synoptic. okoko 12:02:10 PM Synoptic. yes yes 12:02:12 PM Synoptic. WOT 12:02:14 PM Blundar part throttle is much tougher 12:02:21 PM Synoptic. meaning, the less vaccum in the table 12:02:33 PM Blundar you kinda have to infer things from WOT changes 12:02:39 PM Synoptic. so I should be playing in the last colums of the table 12:02:44 PM Blundar you want part throttle much leaner than WOT 12:02:59 PM Blundar rightmost 3-4 columns is all you should really touch 12:03:06 PM Synoptic. kk 12:03:09 PM Synoptic. cool 12:03:15 PM Synoptic. I feel 0.5% less morron 12:03:17 PM Synoptic. :) 12:03:30 PM Synoptic. we should write this howto on the wiki 12:03:33 PM Blundar :)
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- less than 10psi: 12:1 Air Fuel Ratio
- up to 16psi: 11:1 Air Fuel Ratio
- 9.5:1 compression or less: 1 degree retard/#boost
- above 9.5:1 compression at least 1.25 degrees per psi
11:54:14 AM Dave B. you have a wideband, I presume? 11:54:18 AM Synoptic. hmm 11:54:21 AM Synoptic. no 11:54:23 AM Synoptic. :P 11:54:24 AM Blundar if not, forget it 11:54:28 AM Synoptic. i need to fix civic1990si one's 11:54:31 AM Synoptic. we do that today 11:54:40 AM Synoptic. its the DIY one 11:54:54 AM Synoptic. lets say i'm gonna have one this afternboon 11:55:05 AM Blundar then put it on the car 11:55:07 AM Blundar wait 11:55:13 AM Blundar do you have a narrowband out or not? 11:55:35 AM Blundar the ECU will get pissed off about not having a narrowband 11:55:36 AM Synoptic. i have 2 o2 input on my header 11:55:43 AM Synoptic. so i'll simply add the wb 11:55:44 AM Blundar ok then you're set 11:55:52 AM Blundar drive around with the WB 11:56:04 AM Blundar you'll see what afrs you're at 11:56:18 AM Synoptic. k 11:56:28 AM Synoptic. will AFr change a lot while dringin ? 11:56:33 AM Synoptic. or it will stabilize ? 11:56:48 AM Blundar change a LOT 11:56:56 AM Synoptic. and how to i modify my afr, using te, timing, fuel? how does it ork? 11:56:58 AM Synoptic. okok 11:57:06 AM Synoptic. so how do i tune my car then.. 11:57:08 AM Blundar afr is mostly fuel 11:57:08 AM Synoptic. i'm a morron 11:57:09 AM Synoptic. help me 11:57:13 AM Blundar heheheh 11:57:14 AM Synoptic. ok 11:57:24 AM Blundar nick, I honestly don't have time to hold your hand on this 11:57:58 AM Blundar I'm trying to recover a crashed reiserfs in another window :) 11:58:03 AM Synoptic. basically, do I run at steady RPM to see what AFR it is ? average), i do that for all RPMS, tak enote, enrich, then try again ? 11:58:13 AM Synoptic. i love linux 11:58:18 AM Blundar its much more difficult than that 11:58:32 AM Blundar because you won't be able to hold a steady RPM @WOT without a dyno 11:58:37 AM Blundar you'll be able to do a pull 11:58:49 AM Blundar start at low RPM in e=3rd or 4th geat 11:58:53 AM Blundar floor it 11:59:01 AM Blundar watch the AFRs as you gradually accelerate 11:59:04 AM Blundar watch tach 11:59:13 AM Blundar you'll see it change wtih RPM 11:59:21 AM Blundar make some changes to fuel, observe changes in AFR 11:59:24 AM Blundar repeat 11:59:36 AM Synoptic. k 11:59:38 AM Synoptic. ok 11:59:39 AM Synoptic. i get it 11:59:41 AM Blundar you'll quickly learn how much to change fuel to get disred afr 11:59:49 AM Blundar start relatively small 11:59:52 AM Synoptic. then engine need to have force applyed.. 11:59:58 AM Blundar you';d be amazed what 3-5% will do 12:00:03 PM Synoptic. kk 12:00:09 PM Synoptic. keep stock timing 12:00:15 PM Synoptic. then adjust if i hear detonation 12:00:23 PM Synoptic. but if i put more fuel, i should advance it 12:00:25 PM Synoptic. i know that 12:00:34 PM Synoptic. timing will only change the powerband curve, right ? 12:00:45 PM Blundar timing will change everything 12:00:48 PM Blundar nail your fuel first 12:00:52 PM Synoptic. ok 12:00:53 PM Blundar then go back and play with timing 12:00:54 PM Synoptic. stock timing 12:00:56 PM Synoptic. stock pressure 12:01:00 PM Synoptic. go for fuel 12:01:01 PM Synoptic. then 12:01:03 PM Synoptic. timing 12:01:05 PM Synoptic. then 12:01:08 PM Synoptic. pressure 12:01:14 PM Blundar yessssssss 12:01:15 PM Synoptic. kk 12:01:18 PM Blundar pretty much 12:01:19 PM Synoptic. k 12:01:38 PM Synoptic. and floor it on 4th or 3rd so rpm doesnt go up super fast and ngine stil have a load. 12:01:50 PM Synoptic. that will do a base tune.. 12:01:59 PM Synoptic. and with that i could go on a dyno. 12:02:00 PM Blundar yeah 12:02:02 PM Synoptic. kk 12:02:03 PM Synoptic. i get it 12:02:04 PM Blundar that will do WOT 12:02:07 PM Synoptic. okoko 12:02:10 PM Synoptic. yes yes 12:02:12 PM Synoptic. WOT 12:02:14 PM Blundar part throttle is much tougher 12:02:21 PM Synoptic. meaning, the less vaccum in the table 12:02:33 PM Blundar you kinda have to infer things from WOT changes 12:02:39 PM Synoptic. so I should be playing in the last colums of the table 12:02:44 PM Blundar you want part throttle much leaner than WOT 12:02:59 PM Blundar rightmost 3-4 columns is all you should really touch 12:03:06 PM Synoptic. kk 12:03:09 PM Synoptic. cool 12:03:15 PM Synoptic. I feel 0.5% less morron 12:03:17 PM Synoptic. :) 12:03:30 PM Synoptic. we should write this howto on the wiki 12:03:33 PM Blundar :)
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