you sound like you have a good stand on your car. "sweet spot". if it works it works. as for doing the old school locking the timing down issue- it has been tried. the car will blow the tires on the bottom end but will fall off on the top end. do a search i may be wrong. lots of timing calls for a higher octane(slower burning) fuel. and vp is a better burning fuel than pump gas.as for when the ecu decides to adjust timing... it looks at thottle(tps) , o2, coolant temp and mass air or map to decide on wheather to adjust the timing factor. like i said it is what each engine likes. is your setup where the car runs the fastest times?JJFIVEOH said:I am still running with the spout connector installed. I guess that is what I was trying to get at. If there is no detonation, why and when does the computer start to make it's own adjustments? I use the 20 degrees and VP 103 because the car never sees the street, it's more responsive off the line and less susceptible to air changes. I need the quick response for reaction times, and with the crappy tropical air here in FL, it makes it much easier to dial in with the VP 103. I've been running like this for a while, but I want to try running without the spout connector and lock the timing down so the computer has less control.
The computer's advance tables are set. All you do when advancing the timing is to phase-shift the tabling. Like if you ran 10* base timing (SPOUT out) and put the SPOUT back in, timing goes to ~20*. Now in some given situation, let's say your timing is 40* total.JJFIVEOH said:I am still running with the spout connector installed. I guess that is what I was trying to get at. If there is no detonation, why and when does the computer start to make it's own adjustments? I use the 20 degrees and VP 103 because the car never sees the street, it's more responsive off the line and less susceptible to air changes. I need the quick response for reaction times, and with the crappy tropical air here in FL, it makes it much easier to dial in with the VP 103. I've been running like this for a while, but I want to try running without the spout connector and lock the timing down so the computer has less control.
but the ecu still tries to adjust fuel/air mixture based on a 10 degree timing factor(facory setting was actually 7-9) while getting input from the sensors. i understand the programmed tables. i was gm certified in fuel injection but never ford.HISSIN50 said:The computer's advance tables are set. All you do when advancing the timing is to phase-shift the tabling. Like if you ran 10* base timing (SPOUT out) and put the SPOUT back in, timing goes to ~20*. Now in some given situation, let's say your timing is 40* total.
If you bump static timing to 14* instead of 10, now with the SPOUT reinstalled, you will see around 24* (instead of 20*). And in that same random situation as above, you would see 44* total timing rather than 40. It is just a phase shift.
this is a total drag car? probably never sees closed loop mode where all of the sensors come into play.JJFIVEOH said:It's setup to run the quickest, but still have all the accessories to make pass after pass. i.e. no icing intake, full belt to cool and charge, etc. It was dynoed with peak HP at 4950. So even if I retarded it to get some top end, the motor can't breath for it to make any difference. With 26" tires and 4.10 gears, I go through around 5200. Bracket racing season down here runs from January till October so I have a little time to mess around. The car is deadly consistent, but I'd say on average once out of every 20 runs it throws a curveball at me. I know even carbed drag cars do the same thing, but I figure if I can take away as much computer control as I can, I can eliminate those "freak" runs. I was just wondering about computer control with the spout connector pluged in.
troyGT03 said:but the ecu still tries to adjust fuel/air mixture based on a 10 degree timing factor(facory setting was actually 7-9) while getting input from the sensors. i understand the programmed tables. i was gm certified in fuel injection but never ford.
troyGT03 said:this is a total drag car? probably never sees closed loop mode where all of the sensors come into play.
the open loop mode only uses certain sensors such as tps,etc. when a certain temp is achieved the closed loop begins and all sensor inputs are used to tune air/fuel mixture.JJFIVEOH said:If you are implying that it takes some time for all the sensors to come into play, my fluke runs usually happen after I've made several runs. After a fluke run, it'll continue to run that way the rest of the night. So I guess what you are thinking would make sense.
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