rom tuning for pops and backfires

[mad_sb]

Originally Posted by Grip Ronin

ive tried zeroing timers, it didnt do much but i did find that messing wit the front o2 ratio changes the 20.3 ratio when in closed loop off throttle but i havnt found the timing control for it. i dont know if the primary igniton table would do that

Not sure what table you are talking about for the front 02 ratio. Are you referencing a dedicated wideband when you say messing with the ratio changes the 20.3 you see during decel? If you are going off the factory front sensor then messing with the sensor scaling will change the value you log, but not the actual ARF. During closed loop operation, it will cause the actual afr to shift since the ecu will be looking for a different voltage / current value for stoich.

It may not track the timing maps if it has unique logic for decel fuel cut, but you should be able to tell from your logs what load cell is tracking during decel and if it is using the map values or some other values during decel.

[mad_sb]

Originally Posted by andrew5826

wow. great discussion going on. did some testing. I changed the ignition advance base timing A map to neg 10 degrees on the first column (,15) and the base idle (above speed threshold) to negative timing. lots of pops at partial throttle. lots on downshift and a couple on hard shifts. I'm gonna fine tune it a bit more so I don't have to play with the throttle so much to get the pops.

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I would advise you rescale the columns and set the first column to the load you see in full decel and the second column just above the load you see in decel and make the timing normal in the second column. Otherwise you will be driving around at light load with horribly retarded timing.

[SmsAlSuwaidi]

Look into Bee*R, i am considering buying it and giving it a shot too

[Grip Ronin]

Originally Posted by mad_sb

Not sure what table you are talking about for the front 02 ratio. Are you referencing a dedicated wideband when you say messing with the ratio changes the 20.3 you see during decel? If you are going off the factory front sensor then messing with the sensor scaling will change the value you log, but not the actual ARF. During closed loop operation, it will cause the actual afr to shift since the ecu will be looking for a different voltage / current value for stoich.

It may not track the timing maps if it has unique logic for decel fuel cut, but you should be able to tell from your logs what load cell is tracking during decel and if it is using the map values or some other values during decel.

ya so the scaling wouldnt be the answer. i knew i couldnt do it without timing change so i didnt keep the setting.

[andrew5826]

Originally Posted by mad_sb

I would advise you rescale the columns and set the first column to the load you see in full decel and the second column just above the load you see in decel and make the timing normal in the second column. Otherwise you will be driving around at light load with horribly retarded timing.

would this make it so that it pops every time im off the gas? with just the first column set to negative timing, i found that i don't get pops unless i get the throttle in the perfect position.. which means the engine doesn't see the load with the negative timing unless i want it to and i like that because its kind of like an on off switch. cops probably wouldn't be too happy if they heard it

[Grip Ronin]

Originally Posted by andrew5826

would this make it so that it pops every time im off the gas? with just the first column set to negative timing, i found that i don't get pops unless i get the throttle in the perfect position.. which means the engine doesn't see the load with the negative timing unless i want it to and i like that because its kind of like an on off switch. cops probably wouldn't be too happy if they heard it

its because of your load break point, off throttle is less then .10. but maps start at .15... did you try it without the idle adjustment?

[s2d4]

Originally Posted by Grip Ronin

its because of your load break point, off throttle is less then .10. but maps start at .15... did you try it without the idle adjustment?

Which map are you talking about?

Most of your posts don't make much sense.

Edit: I see what mad_sb is talking about now, got thrown off with cl/ol delay timers and o2 ratio weirdness...

[Grip Ronin]

Originally Posted by s2d4

Which map are you talking about?

Most of your posts don't make much sense.

Edit: I see what mad_sb is talking about now, got thrown off with cl/ol delay timers and o2 ratio weirdness...

sorry you dont understand. i get impatiant typing on a phone. im talking about his ignition table. he said that he only gets the crackle when at part throttle. thats the change in engine load and possibly because it switches to open loop fuel map once you hit the gas

[andrew5826]

been driving with the changes to ignition map for a couple days. no change in off/on throttle response and drives just like before. I really got the throttle positioning down to where I can drop pops anywhere and anytime I want.

to those negative individuals, it sounds ****ing awesome. [ame]http://youtu.be/c2VgspN8oBQ[/ame]

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[SmsAlSuwaidi]

Originally Posted by andrew5826

been driving with the changes to ignition map for a couple days. no change in off/on throttle response and drives just like before. I really got the throttle positioning down to where I can drop pops anywhere and anytime I want.

to those negative individuals, it sounds ****ing awesome.

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Does it shoot flames or just pops ?


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[andrew5826]

no flames

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[SmsAlSuwaidi]

Originally Posted by andrew5826

no flames

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Saaaaadfaaaaace


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[andrew5826]

probably could get some if you added extra fueling. or maybe a turbo

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[SmsAlSuwaidi]

Originally Posted by andrew5826

probably could get some if you added extra fueling. or maybe a turbo

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I might go ahead and buy bee*r ( i'll be turbo)


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