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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:
- 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
A little knowledge can be a dangerous thing.
You can find a howto for tuning to pass a smog test by checking out Tuning For Smog -- markolson - 19 Feb 2005
Here is a log from MSN conversation between Synoptic and Blundar.
An how-to for tunning the maps of the ECU for WOT operation. It is very basic, but it gives a good idea of how it works.
LOG START
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 :)
LOG END
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