dead/flat spot in tune
Thread Starter
Launching!
Joined: Dec 2006
Posts: 242
Likes: 32
dead/flat spot in tune i have a pretty noticeable flat spot in my tune part throttle...
i had a o2 sensor go bad and i was running in open loop for a couple weeks and i didnt have the dead spot. when i put new o2 in and cleared LTs and went back to closed loop i have the dead spot.
is it really only the fueling that could cause this? i think the timing is pretty simple and if it was this bad it seems like it would be a mistake in the tune or something? i guess it kinda feels at a certain point the timing gets backed down a lot
im kinda spit balling here i could data log with hptuners and see what is happeneing i guess
i had a o2 sensor go bad and i was running in open loop for a couple weeks and i didnt have the dead spot. when i put new o2 in and cleared LTs and went back to closed loop i have the dead spot.
is it really only the fueling that could cause this? i think the timing is pretty simple and if it was this bad it seems like it would be a mistake in the tune or something? i guess it kinda feels at a certain point the timing gets backed down a lot
im kinda spit balling here i could data log with hptuners and see what is happeneing i guess
i have a pretty noticeable flat spot in my tune part throttle...
i had a o2 sensor go bad and i was running in open loop for a couple weeks and i didnt have the dead spot. when i put new o2 in and cleared LTs and went back to closed loop i have the dead spot.
is it really only the fueling that could cause this? i think the timing is pretty simple and if it was this bad it seems like it would be a mistake in the tune or something? i guess it kinda feels at a certain point the timing gets backed down a lot
im kinda spit balling here i could data log with hptuners and see what is happeneing i guess
i had a o2 sensor go bad and i was running in open loop for a couple weeks and i didnt have the dead spot. when i put new o2 in and cleared LTs and went back to closed loop i have the dead spot.
is it really only the fueling that could cause this? i think the timing is pretty simple and if it was this bad it seems like it would be a mistake in the tune or something? i guess it kinda feels at a certain point the timing gets backed down a lot
im kinda spit balling here i could data log with hptuners and see what is happeneing i guess
******* brilliant man! I think you might be onto something there!
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Thread Starter
Launching!
Joined: Dec 2006
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it rained really hard and i parked in a huge puddle i couldn't really see in a dark parking lot and got my o2 sensor plugs filled with water, so i went maf only until i could dry them out and the flat spot is gone.
any ideas?
any ideas?
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your o2s are more likely pulling fuel with a delay. Meaning they are spitting out feedback based on a time delay that does not pertain to the current cell point the moment combustion happened.
Increase the transport delay, so the o2s can compensate for the data they are seeing. If you have headers, the o2 sensors are located further down from the cylinder than they would with factory manifolds, by the time the o2 spits out the reading, the ecu is in a different fuel cell altogether, and will always have a lag, constantly compensating for a combustion that ocurred e.g half a millisecond ago
I assume both o2s are working/switching as they should of couse.
Increase the transport delay, so the o2s can compensate for the data they are seeing. If you have headers, the o2 sensors are located further down from the cylinder than they would with factory manifolds, by the time the o2 spits out the reading, the ecu is in a different fuel cell altogether, and will always have a lag, constantly compensating for a combustion that ocurred e.g half a millisecond ago
I assume both o2s are working/switching as they should of couse.
Thread Starter
Launching!
Joined: Dec 2006
Posts: 242
Likes: 32
your o2s are more likely pulling fuel with a delay. Meaning they are spitting out feedback based on a time delay that does not pertain to the current cell point the moment combustion happened.
Increase the transport delay, so the o2s can compensate for the data they are seeing. If you have headers, the o2 sensors are located further down from the cylinder than they would with factory manifolds, by the time the o2 spits out the reading, the ecu is in a different fuel cell altogether, and will always have a lag, constantly compensating for a combustion that ocurred e.g half a millisecond ago
I assume both o2s are working/switching as they should of couse.
Increase the transport delay, so the o2s can compensate for the data they are seeing. If you have headers, the o2 sensors are located further down from the cylinder than they would with factory manifolds, by the time the o2 spits out the reading, the ecu is in a different fuel cell altogether, and will always have a lag, constantly compensating for a combustion that ocurred e.g half a millisecond ago
I assume both o2s are working/switching as they should of couse.
they are LTs so they are way down compared to the stock manifolds above the cats.
can you tell me where to change that in HPT if i don't hear anything i'll just google it
Thread Starter
Launching!
Joined: Dec 2006
Posts: 242
Likes: 32
i made some changes to the tune as far as the delay and the other things that if you search hptuners forums it says to do with long tubes, it seems to make it worse, the tune 99.9% already had this changed but it was worth a try.
the tune was from pcm4less.
i did notice while logging that the LT was 10-15 maybe a little more in the red.
i'm going to edit VE to add fuel.
the tune was from pcm4less.
i did notice while logging that the LT was 10-15 maybe a little more in the red.
i'm going to edit VE to add fuel.
