off throttle/deep vacuum afr
#1
off throttle/deep vacuum afr
I have my off throttle/deep vacuum afrs at around 11s-12s, would it be better to leave it that rich or make it leaner, or what should the desired afrs on deep vac be? i noticed the car feels heavy or drones a lil louder with the afr i have
#8
im doing some tuning right now, i was already tuned but im tweaking my map after i got some stuff fixed. I dont have problem changing my fuel maps though, tuning a standalone is so extensive and no way 3-4 hrs on the dyno will get it completely configured so I have to learn stuff myself. Once i get the tune close i will take it to a pro tune
#10
Re: off throttle/deep vacuum afr
Originally Posted by Ace83
I have my off throttle/deep vacuum afrs at around 11s-12s, would it be better to leave it that rich or make it leaner, or what should the desired afrs on deep vac be? i noticed the car feels heavy or drones a lil louder with the afr i have
Do you kno at what point the car is feeling heavy? The louder exhaust may be a result of too much timing retard... Have you tinkered with the vvt.
#11
Just so you know Ace, the Unichip is tuned to be extremely lean once throttle is let off - my gauge registers 22.4 which is the max... and staying off throttle, it eventually goes back to 14.4-14.8.
#12
Re: off throttle/deep vacuum afr
Originally Posted by purevision01
Originally Posted by Ace83
I have my off throttle/deep vacuum afrs at around 11s-12s, would it be better to leave it that rich or make it leaner, or what should the desired afrs on deep vac be? i noticed the car feels heavy or drones a lil louder with the afr i have
Do you kno at what point the car is feeling heavy? The louder exhaust may be a result of too much timing retard... Have you tinkered with the vvt.
#13
Originally Posted by B_Real45
Just so you know Ace, the Unichip is tuned to be extremely lean once throttle is let off - my gauge registers 22.4 which is the max... and staying off throttle, it eventually goes back to 14.4-14.8.
#14
I dont have much experience with the Hydra but I do have a lil experience with the AEM on the tC and I know the AEM doesnt come programmed with a map for the VVTI. But I would agree with you, lean out the 0 throttle % percent as much as you can then tune from there... Check to see what the ecu or the wideband shows when the car is bucking... I would keep all vacuum readings between 14.0 and 15.0... The highier the rpm the more fuel I would add until reaching 14.0. IMO more fuel then that in vac is not necessary. Having the wideband hooked up to the Hydra (if that capability exists) would help when data logging you runs and you can make a note of the buck and run it back.
Let me know, might not be a big deal.
Let me know, might not be a big deal.
#16
Originally Posted by purevision01
I dont have much experience with the Hydra but I do have a lil experience with the AEM on the tC and I know the AEM doesnt come programmed with a map for the VVTI. But I would agree with you, lean out the 0 throttle % percent as much as you can then tune from there... Check to see what the ecu or the wideband shows when the car is bucking... I would keep all vacuum readings between 14.0 and 15.0... The highier the rpm the more fuel I would add until reaching 14.0. IMO more fuel then that in vac is not necessary. Having the wideband hooked up to the Hydra (if that capability exists) would help when data logging you runs and you can make a note of the buck and run it back.
Let me know, might not be a big deal.
Let me know, might not be a big deal.
im venting to atmosphere, im not using a maf sensor though
#20
by "Deep Vac" are you referring to the engine when you are in gear and completely off the gas? Idle/ cruise vac, about -20 psi im running about 15 +/-1
when i down shift (approaching a stop) completely off throttle im at -22psi (i believe this is max on the AEM Tru boost gauge) and my AFR is "---" which is 17++
I never really questioned it.... you're making me think about it now. What would a good tuner (obviously not mine) have for the afr "Goal"
when i down shift (approaching a stop) completely off throttle im at -22psi (i believe this is max on the AEM Tru boost gauge) and my AFR is "---" which is 17++
I never really questioned it.... you're making me think about it now. What would a good tuner (obviously not mine) have for the afr "Goal"