04-20-2015, 07:10 PM | #29 |
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With ztan's di/pi fix, i have stock AT 700rpm idle. Imo you're wasting 25% more fuel for no reason. Get some headers and plug up the sound tube and you'll hear the exhaust.
You don't need to correct overall trims, you only need to correct AFRs. If you're hitting 12.5-12.0 in OL, don't bother. Were you running eflex?
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Last edited by Wayno; 04-20-2015 at 09:29 PM. |
04-21-2015, 03:46 AM | #30 |
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Is this the di/pi fix you mean? http://www.ft86club.com/forums/showp...6&postcount=21
Don't want to break the warranty just yet, as I've only had the car for a year and driven 16000 km, so I'll wait a couple of years with the header. I know it would be burning some more fuel, but it just sounds to me like it should have had a few more idle rpm from the factory. When the a/c compressor starts when I'm just about to pull away at a traffic light - right as I'm lifting the clutch a bit and just before I get on the gas - it sometimes gets a little choppy... And I'm not standing around in idle all day, so guess I wouldn't even notice in fuel economy Looks like AFR stays between 13 and 12 in OL, just reaching 11.48 at the last reading at red line... Sorry, what is eflex? You mean flex-fuel kit? If that, then no |
04-21-2015, 04:07 AM | #31 | |
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Running on di helps with takeoff as well less jerky as does scaling maf and getting your afr correct and fuel trims low. We are running E85 that guaranteed 85%. you need all the changes to achieve the better economy not just the idle fixs |
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04-21-2015, 08:59 AM | #32 | |
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Will the di/pi fix remove this? I am planning on copying all the recommended tables and not only the required ones. Will the di/pi fix have a negative impact on fuel economy? |
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04-21-2015, 04:35 PM | #33 | |
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so we have leaned out lower load low rpm area of the maps ie OL and CL fuel tables below 0.8 load and 3000 rpm the running full DI at rearly low loads ie below 0.2 man or 0.3 auto smooths idle and the transition off idle hopefully allowing you to drop idle from 750 to 700 or even back to 650 (stock idle on manual). this and a couple of other tweaks has resulted in city economy of about 9l/100km as opposed to 12-13 on original tune. ticking sound is likely injectors firing, chirpy sound is likely high pressure fuel pump, both sounds are "normal" on this car, unless you have spun a bearing :-) It been cold here like below 25C (well thats cold for us) so not been running A/C since i tweaked the di/pi ratios, but it may help the dip when a/c kicks in . |
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04-22-2015, 02:38 AM | #34 |
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I've applied the changes now, but it's still in the trim learning phase.
It already feels much smoother and looks like there is no impact on the rpm when a/c kicks in |
04-22-2015, 06:39 AM | #35 |
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So you just zeroed the 0,2g/rev column in the three Total Injection Ratio Port tables?
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04-22-2015, 11:26 AM | #36 |
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Yes, it was actually already applied in Wayno's tune, so I just copied it over.
I did a 20 minute log on my way to work today. It was mostly city driving with 3 minutes on the highway. Could you please have a look at it, because I see some fairly high fuel trims at low rpm and load - also STFT counters LTFT by quite much a times. IAM stays at 1 and no knock according to FLKC and FBKC. When I get on the gas, the trims stay within +- 3%. http://datazap.me/u/cawith/city-driv...ata=1-7-8-9-11 The high correction at idle rpm og kick in, is that due to more or less ethanol than 85%? |
04-22-2015, 01:54 PM | #37 | |
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I would also like to praise your good work, and add to it by including a cold start fix and some AVCS tuning for better volumetric efficiency at low rpm's and better power at higher rpm's. |
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04-22-2015, 05:52 PM | #38 |
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No
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04-22-2015, 06:41 PM | #39 | |
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you can manually tweak the idle area by lokking at the maf volts values at idle, then look at your average fuel trim if its 6% positive then add say 4% to the values either side and 6% to the idle flow value. if it was negitive then subtract. 6% at idle is not to bad, it will vary due to intake air temp variations which can be large when sitting in traffic. to get it better you would have to do your own maf scaling on your average ethanol content. Last edited by steve99; 04-22-2015 at 06:51 PM. |
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04-23-2015, 05:22 AM | #41 | |
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When you say add around 4% to the values either side, do you then mean the 2 Base Timing idle (in-gear) tables? And also which table for the idle flow? Thanks again to Wayno for this awesome improvement! |
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04-23-2015, 06:11 AM | #42 | |
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the table i was talking about was maf scale table, have a read of the maf scaling link below. |
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The Following User Says Thank You to steve99 For This Useful Post: | cawith (04-23-2015) |
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