AFR readings way off between different WB
08-09-2006, 10:05 PM
#11
It feels a lot weaker off idle but I assumed that was due to the true dual LT's.
I have not touched the fueling or timing tables since the dyno, I dont even know how.
The WB was calibrated and reads correct at idle and cruise. I understand that the numbers will go ape **** when I stomp it and when I let off. It's the steady 9.x while I'm at 100% throttle thats throwing me.
The WB at the dyno was giving readings like 11.5, the tuner would pull fuel and then it would read 11.2. So his WB may have had issues. He thought my boost-a-pump may have been acting up because the wire laid on the LT for a minute and melted the outer sheath. I havent investigated that yet but my fuel pressure doesnt drop so, if its messing up, it is staying ON all the time. It was like this at the dyno so it shouldnt even be an issue. I guess I will have to go back over and let him street tune it or have him throw in his WB (in another bung) and compare numbers on tht same run. I dunno. I was just wondering if anyone had heard of this before. Maybe he had too much load on the truck while on the dyno and on the street its running rich.
I have not touched the fueling or timing tables since the dyno, I dont even know how.
The WB was calibrated and reads correct at idle and cruise. I understand that the numbers will go ape **** when I stomp it and when I let off. It's the steady 9.x while I'm at 100% throttle thats throwing me.
The WB at the dyno was giving readings like 11.5, the tuner would pull fuel and then it would read 11.2. So his WB may have had issues. He thought my boost-a-pump may have been acting up because the wire laid on the LT for a minute and melted the outer sheath. I havent investigated that yet but my fuel pressure doesnt drop so, if its messing up, it is staying ON all the time. It was like this at the dyno so it shouldnt even be an issue. I guess I will have to go back over and let him street tune it or have him throw in his WB (in another bung) and compare numbers on tht same run. I dunno. I was just wondering if anyone had heard of this before. Maybe he had too much load on the truck while on the dyno and on the street its running rich.
08-09-2006, 10:20 PM
#12
Originally Posted by 1SlowHoe
It feels a lot weaker off idle but I assumed that was due to the true dual LT's.
I have not touched the fueling or timing tables since the dyno, I dont even know how.
The WB was calibrated and reads correct at idle and cruise. I understand that the numbers will go ape **** when I stomp it and when I let off. It's the steady 9.x while I'm at 100% throttle thats throwing me.
The WB at the dyno was giving readings like 11.5, the tuner would pull fuel and then it would read 11.2. So his WB may have had issues. He thought my boost-a-pump may have been acting up because the wire laid on the LT for a minute and melted the outer sheath. I havent investigated that yet but my fuel pressure doesnt drop so, if its messing up, it is staying ON all the time. It was like this at the dyno so it shouldnt even be an issue. I guess I will have to go back over and let him street tune it or have him throw in his WB (in another bung) and compare numbers on tht same run. I dunno. I was just wondering if anyone had heard of this before. Maybe he had too much load on the truck while on the dyno and on the street its running rich.
I have not touched the fueling or timing tables since the dyno, I dont even know how.
The WB was calibrated and reads correct at idle and cruise. I understand that the numbers will go ape **** when I stomp it and when I let off. It's the steady 9.x while I'm at 100% throttle thats throwing me.
The WB at the dyno was giving readings like 11.5, the tuner would pull fuel and then it would read 11.2. So his WB may have had issues. He thought my boost-a-pump may have been acting up because the wire laid on the LT for a minute and melted the outer sheath. I havent investigated that yet but my fuel pressure doesnt drop so, if its messing up, it is staying ON all the time. It was like this at the dyno so it shouldnt even be an issue. I guess I will have to go back over and let him street tune it or have him throw in his WB (in another bung) and compare numbers on tht same run. I dunno. I was just wondering if anyone had heard of this before. Maybe he had too much load on the truck while on the dyno and on the street its running rich.
With that said, you said
The WB at the dyno was giving readings like 11.5, the tuner would pull fuel and then it would read 11.2. So his WB may have had issues.
08-09-2006, 10:31 PM
#13
My IDC was exactly 80%. I asked.
No matter which reading is correct, I'm safe. I just wonder if the dyno had too much load on it or his WB was acting up, I may have left a bunch of power on the table. 2 points in AFR has got to be worth a few ponies and pounds of TQ.
I dont want to wait until my cam swap (months away) before I know. I guess I'll be making a trip over to the dyno. Hes the only tuner around here that I trust and he has the newest gear.
No matter which reading is correct, I'm safe. I just wonder if the dyno had too much load on it or his WB was acting up, I may have left a bunch of power on the table. 2 points in AFR has got to be worth a few ponies and pounds of TQ.
I dont want to wait until my cam swap (months away) before I know. I guess I'll be making a trip over to the dyno. Hes the only tuner around here that I trust and he has the newest gear.
08-10-2006, 04:50 PM
#18
It reads 14-15 at idle and part throttle from a red light. When I put the truck into low bost, about 2psi, I'm still seeing 14.x AFR. Is that right? At what boost level should I see it dropping? My boost-a-pump doesnt kick on until 3 psi but I dont know if that has anything to do with it.
Also, at say, 25% throttle when trying to speed up but not downshift, the AFR gets into the 8's. The truck bogs down as well. So it sure feels rich. I'm thinking a street tune may be in order for the part throttle stuff and maybe another run on the dyno to see what I get at WOT.
Also, at say, 25% throttle when trying to speed up but not downshift, the AFR gets into the 8's. The truck bogs down as well. So it sure feels rich. I'm thinking a street tune may be in order for the part throttle stuff and maybe another run on the dyno to see what I get at WOT.
08-10-2006, 05:22 PM
#19
Originally Posted by 1SlowHoe
It reads 14-15 at idle and part throttle from a red light. When I put the truck into low bost, about 2psi, I'm still seeing 14.x AFR. Is that right? At what boost level should I see it dropping? My boost-a-pump doesnt kick on until 3 psi but I dont know if that has anything to do with it.
Also, at say, 25% throttle when trying to speed up but not downshift, the AFR gets into the 8's. The truck bogs down as well. So it sure feels rich. I'm thinking a street tune may be in order for the part throttle stuff and maybe another run on the dyno to see what I get at WOT.
Also, at say, 25% throttle when trying to speed up but not downshift, the AFR gets into the 8's. The truck bogs down as well. So it sure feels rich. I'm thinking a street tune may be in order for the part throttle stuff and maybe another run on the dyno to see what I get at WOT.
It does sound like you are rich if bogging and seeing 8's.
