DRY Dual Tuning
DRY Dual Tuning i have 2 stages and either of the stages will hit 10,XXX hz by themselves or together.
na tops off at 97xx hz.
meaning that the 2nd won't add any more hz to the maf reading. is this ok or should i move the nozzle for whichever one i want as a 1st stage to get it to read below 10k hz but above the 97xx hz and the 2nd to read above that. afr is good at 11.5 as it is but there is additional air coming in when the 2nd is hit and i don't know what to do with it.
na tops off at 97xx hz.
meaning that the 2nd won't add any more hz to the maf reading. is this ok or should i move the nozzle for whichever one i want as a 1st stage to get it to read below 10k hz but above the 97xx hz and the 2nd to read above that. afr is good at 11.5 as it is but there is additional air coming in when the 2nd is hit and i don't know what to do with it.
its with both stages and when by themselves. when the 2nd hit there would be a 12.5-12.8 lean for roughly 1 second then come back down. the maf hitting 10k was only momentary while the hz stayed consistentlt at 9400-9750 or so.
now i have to start all over again because i tried a higher jetting for the 1st stage and my afr is way off.
now i have to start all over again because i tried a higher jetting for the 1st stage and my afr is way off.
regardless if the MAF jumps up for a second or so, if your a/f stays at 11.5 with one or both stages, you have a fine working dry system with no problems. Now the lean spike when the 2nd stage hits, I get one also, but it's under a second (micro second) so no worry. If it lasted then it would be something to worry about. I have the LM1 which gives the time line on the graph. If ya have a dyno or a/f printout, we could figure a timeline based on rpm and how long the spike remains, post if ya have one.
I think your fine. I would like to add a pic of your nozzle placement in my stash, and include the a/f for reference to help others. if ya don't mind?
Robert
I think your fine. I would like to add a pic of your nozzle placement in my stash, and include the a/f for reference to help others. if ya don't mind?
Robert
the 1st stage(55) was a zex nozzle just stuck through the airfilter. the top of the tip was about 1" high off of the filter and about 2" away from the end of the filter closest to the maf. this worked fine as far as afr but i kept effin with it and the 2nd stage to get better 1/4 times. and to get rid of a lean spike at the beginning
yesterday before going to the track, i tried upping it to a 100 and now the afr is way too lean at 14.0+. it didn't get read by the maf at all. the spray pattern through the nozzle changed alot when i tested it off the car. i sprayed 4 times on my way to the track, changed the location a couple of times and it kept on running lean.
then i tried facing the 100 away from the maf and got my afr to to go down to 12.5-13.0 which is way to lean and i only knocked down .3 in the 1/4. so something isn't right. i held it down the track only once and got a misfire code and the car started acting real rough. i changed the plugs today and so far tonight it has been running better.
the 2nd stage i had was a dual nozzle rigged and i doubt i could duplicate it. it was a trial and error and got lucky. i was using for a couple of weeks. sometimes it would not work correctly and cause backfires. but now i can't get it to work correctly.
i pulled both stages off before i went to the track yesterday. 2nd is not working right and 1st has not been attempted to be reinstalled the way it was prior to the 55hp jets.
right now my original question is of no use to me. but hypothetically what should i do in this case if the 2nd stage doesn't add more hz? by the way my na was set to be rich at around 11.8-11.5 also.
yesterday before going to the track, i tried upping it to a 100 and now the afr is way too lean at 14.0+. it didn't get read by the maf at all. the spray pattern through the nozzle changed alot when i tested it off the car. i sprayed 4 times on my way to the track, changed the location a couple of times and it kept on running lean.
then i tried facing the 100 away from the maf and got my afr to to go down to 12.5-13.0 which is way to lean and i only knocked down .3 in the 1/4. so something isn't right. i held it down the track only once and got a misfire code and the car started acting real rough. i changed the plugs today and so far tonight it has been running better.
the 2nd stage i had was a dual nozzle rigged and i doubt i could duplicate it. it was a trial and error and got lucky. i was using for a couple of weeks. sometimes it would not work correctly and cause backfires. but now i can't get it to work correctly.
i pulled both stages off before i went to the track yesterday. 2nd is not working right and 1st has not been attempted to be reinstalled the way it was prior to the 55hp jets.
right now my original question is of no use to me. but hypothetically what should i do in this case if the 2nd stage doesn't add more hz? by the way my na was set to be rich at around 11.8-11.5 also.
Last edited by caliswangin916; Jul 13, 2007 at 03:04 AM.
Not sure of your mods, but maybe you have two problems working against you, One being the nozzle location, and the other being injectors not up to the task? Are you logging duty cycle as well?
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Originally Posted by Beer99C5
Not sure of your mods, but maybe you have two problems working against you, One being the nozzle location, and the other being injectors not up to the task? Are you logging duty cycle as well?
i would occasionally have to adjust my nozzles because everything was rigged and they would move causing a backfire.
then i tried to use a wet nozzle as a dual stage located where the 1st stage was but then i had problems with it running lean. so i went back to a single stage that was the original 1st stage location and upped my shot to go to the track but now with the the 100 in, maf was not read the nitrous and inj DC was way off causing it to lean 14+. (i was spraying on the way to the track)
i was hoping that since i had the new 100 in the same spot as the old 55, that the maf would read it, but it didn't. so i tried one run down the track after i turned the nozzle away from the maf and got afr down to 12.5-13.0 and i kept on it down the run but et was only reduced by .3 so i know something isn't right. and the maf did not read the nitrous well but still much better than when i had the nozzle facing the maf. i'm having to start all over again.
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