Fuel table question (high load low kpa)
#1
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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?
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?
Last edited by andrew; 06-25-2012 at 04:31 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.
#5
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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.
#6
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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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