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Old 12-31-2020, 08:30 AM   #1961
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Any power advantage? And I thought the exhaust was entirely different from +17 red plenum engines.
17+ header flows a bit better, rest of the exhaust is the same minus a flange being different at the axleback.
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Old 12-31-2020, 10:59 PM   #1962
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Any power advantage? And I thought the exhaust was entirely different from +17 red plenum engines.
Yeah @RToyo86 pretty much covered it, around 11% more volume in the primaries and 16% more in the secondaries. Also slightly different (more EL) layout.

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Old 01-01-2021, 09:28 AM   #1963
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Yeah @RToyo86 pretty much covered it, around 11% more volume in the primaries and 16% more in the secondaries. Also slightly different (more EL) layout.

More like 5.5 and 8% But that`s diameter
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Old 01-01-2021, 09:55 AM   #1964
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More like 5.5 and 8% But that`s diameter
Yep that's for diameter. 11.1% and 16.6% were for cross-sectional volume.

I think there's some concern about slowing exhaust velocity, but for something like an E85 build that's guaranteed to flow more air, I think the benefits would be worth it.
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Old 01-06-2021, 08:39 PM   #1965
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So i have done 500km on my 1st std Wayne roms tune on 98 fuel. Here are 2 x 3rd gear pulls @ oil operating temp

https://datazap.me/u/gen3v8/log-1609978746
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Old 01-06-2021, 09:50 PM   #1966
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So i have done 500km on my 1st std Wayne roms tune on 98 fuel. Here are 2 x 3rd gear pulls @ oil operating temp

https://datazap.me/u/gen3v8/log-1609978746
Might do well to change the closed loop transition timers to stay in closed loop longer to learn the upper LTFT faster, it's still not set by looking at the log, or just drive at part throttle more. After another 1000km that whole rich area will be 4% leaner.

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Old 01-07-2021, 04:09 AM   #1967
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Might do well to change the closed loop transition timers to stay in closed loop longer to learn the upper LTFT faster, it's still not set by looking at the log, or just drive at part throttle more. After another 1000km that whole rich area will be 4% leaner.
Too many Kms and how do I change the timers?
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Old 01-07-2021, 06:33 PM   #1968
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Can someone please check my log? I am on my second day on e85 and am wondering why my fuel trims are so negative? I have gruppe-s UEL Catless header and overpipe.
Thanks guys https://datazap.me/u/luc898/log-1610058698?log=0&data=1
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Old 01-07-2021, 06:55 PM   #1969
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probably just not real e85 in your tank, maybe something more like e60
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Old 01-07-2021, 07:03 PM   #1970
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Hey thanks for the reply, i think i tested it at about e70 give or take 5%, does it look like it is going to have a negative effect on my engine? Or do you think it should be okay. Sorry im pretty new to tuning. Havent noticed any issues in how it runs was just concerned with fuel trims. I can also smell my gas at high rpms when on WOT im not sure if that just cuz catless headers or not. Thanks ALOT

Last edited by Luc898; 01-07-2021 at 07:10 PM. Reason: adding info
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Old 01-07-2021, 11:55 PM   #1971
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Originally Posted by gen3v8 View Post
Too many Kms and how do I change the timers?
Before you edited this you said you already reflashed. There's no proof that the maf scale was wrong, so now we can't collect any data on what would have happened to the trims. Again, if the LTFT had levelled off at 3.91 @ 5200 rpm instead of climing another 4%, the AFR would be perfect. Changing MAF scale is only going to skew the area that's actually working correctly.

FYI openflash disable/limit trims to US fuels and they give MY17 black manifold cars the same tune as red manifold which obviously runs like garbage with so little timing. Zero shits given to anyone outside US.

If you're unwilling to do the km, there's no point trying, however if you do want to try to fix it for real I can email you the files, but you'll have to start logging after 200km and do at least 1000km on the first one.
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Old 01-08-2021, 02:02 PM   #1972
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Before you edited this you said you already reflashed. There's no proof that the maf scale was wrong, so now we can't collect any data on what would have happened to the trims. Again, if the LTFT had levelled off at 3.91 @ 5200 rpm instead of climing another 4%, the AFR would be perfect. Changing MAF scale is only going to skew the area that's actually working correctly.

FYI openflash disable/limit trims to US fuels and they give MY17 black manifold cars the same tune as red manifold which obviously runs like garbage with so little timing. Zero shits given to anyone outside US.

If you're unwilling to do the km, there's no point trying, however if you do want to try to fix it for real I can email you the files, but you'll have to start logging after 200km and do at least 1000km on the first one.
Thanks for your offer! The car is going to be tracked in 2 months so i I need this time to get e85 happy. The car has 29km fuel range left so I will put e85 in today and start adding km`s, refilling again before i start looking closer at logs. I will go back to 98 next summer. I used your pages logged afr recommendation(Petrol OFT logged 11.4 - 11.6 6k-6.8k rpm Flash "Lean-2%") to make the uneducated reflash choice? I spent yesterday afternoon researching ltft and stft and can now see/understand better what`s going on.
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Old 01-12-2021, 09:46 PM   #1973
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https://datazap.me/u/kev0/light-crui...a=6-8-26-35-37

Anyone see anything funny in this datalog? Fuel trims are high negatives in idle but AFR stays normal. Fuel trims are within spec as soon as I start moving.
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Old 01-13-2021, 08:19 AM   #1974
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trims aren t good even when you start moving, usually too negative trims is due to a vacuum/boost/intake leak
possibly after the maf

or, a bad maf scaling /SD scaling
your average -20% of fuel trim looks like an intake leak
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