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Old 06-25-2012, 04:01 PM   #1
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Default Fuel table question (high load low kpa)

Hi,

I just used travisb's fuel table smoothing calculator. Its great. I noticed that when I run auto tune it keeps adding fuel in in the lowest kpa cells when the engine revs are falling (like slowing down slowly) or when changing gear.

I presume I am missing something in my settings as the car drives great, hits its my target AFR's all the time. I just dont know why the engine wants big fuel table no.s when there is no load. Table attached. I have lowered these no.s manually but autotune will look for no.s around 100.

Any suggestions?
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Last edited by andrew; 06-25-2012 at 05:31 PM.
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Old 06-25-2012, 04:02 PM   #2
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i cant imagine it drives great with that fuel table. just imagine how great it will feel when you actually fix your issue of that horrid table...
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Old 06-25-2012, 04:04 PM   #3
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Those cells are hard to tune without a dyno. Put the car in 2nd and roll around at 50mph and tune them manually. VEAL has a hard time understanding what to do when transitioning to over-run.
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Old 06-25-2012, 04:09 PM   #4
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things i noticed:

you have 265cc injectors but a req_fuel for 600-800cc injectors.
youre using include AFRtarget
your ignition table is very retarded
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Old 06-25-2012, 05:02 PM   #5
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Quote:
Originally Posted by Braineack View Post
things i noticed:

you have 265cc injectors but a req_fuel for 600-800cc injectors.
youre using include AFRtarget
your ignition table is very retarded
I need to update my sig, I have 550cc EV14 in now.
My VE values are lower in other areas with same AFRtarget, how is this a problem?
I had the spark table tuned by a tuner on a dyno. He said it was knocking and I asked him to set it conservative. I could be wrong, but I thought the spark map is all relative to the ignition offset angle set in the trigger wizard.
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Old 06-25-2012, 05:15 PM   #6
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Quote:
Originally Posted by Braineack View Post
i cant imagine it drives great with that fuel table. just imagine how great it will feel when you actually fix your issue of that horrid table...
I have manually smoothed the table but it feels the same to drive. This is the fuel table autotune has given me through 5 hours + of tuning and manual smoothing going from easy to very hard. I presume its a bit lumpy in the mid revs/load due to the change in target AFR. The very low revs high kpa areas are not tuned as the car never goes there. I have to say I trust what autotune is giving me, the VE numbers it suggests give me the AFR ratios I want. Its also not tuned above 155 kpa
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Old 06-26-2012, 12:17 AM   #7
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WUE numers also dont have a 100% value, i beleive this means u will always be in WUE with the last value u have (106%). Can someone smart confirm this please .
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Old 06-26-2012, 03:36 AM   #8
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Quote:
Originally Posted by Braineack View Post
things i noticed:
youre using include AFRtarget
That in my understanding is not a bad thing to do (as I said before) - you can change the AFR target table without big changes to the VEtable (because the AFR is included in the fueling calculation.
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Old 06-26-2012, 10:03 AM   #9
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Quote:
Originally Posted by Zaphod View Post
That in my understanding is not a bad thing to do (as I said before) - you can change the AFR target table without big changes to the VEtable (because the AFR is included in the fueling calculation.

sure, but do it AFTER you tune the VE table.
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Old 06-26-2012, 10:20 AM   #10
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Quote:
Originally Posted by Braineack View Post
sure, but do it AFTER you tune the VE table.
then you will have to retune the VEtable again, afaik..
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Old 06-26-2012, 05:33 PM   #11
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Quote:
Originally Posted by Oni View Post
WUE numers also dont have a 100% value, i beleive this means u will always be in WUE with the last value u have (106%). Can someone smart confirm this please .
I brought the WUE down from 106 to 100%. This messed up the fuel table big time. I started the autotune it again, but it was miles off and autotune didn't seem to make changes to the fuel table, so I reverted back to the old tune as I am happy with it.
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