How much will tuning help your power with .650 & .950 O2 reading...
03-13-2004, 10:14 AM
#1
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How much will tuning help your power with .650 & .950 O2 reading... We scanned my car and at WOT up to 4500rpm's the O2's read in the .650 range (really lean) but after that they read around .950 (rich). How much power can I expect to pick up once I get the car tuned? Any guesses?
-Sly
-Sly
03-13-2004, 02:14 PM
#2
You sure you were monitoring the right o2 sensors the first time???
They should always be right around the same value everytime you go WOT.
.650 is extremely lean, and sounds more like a value you would get out of the post-cat o2's ... while .950 is pretty rich. If you're running N/A, you would probably want to be in the .850-.900 range ... if you are running juice, you would want alittle higher then that. Also remember the o2's are not accurate at WOT, and the best idea is to get it on a dyno with a wideband, and compare the results the wideband has, with your o2 readings, so you know exactly what a/f ratio corisponds to what mV readings for your particular car.
One you get the car tuned, have it leaned out alittle, and some timing added ... I would say you could definately pick up 15-20rwhp.
.
They should always be right around the same value everytime you go WOT.
.650 is extremely lean, and sounds more like a value you would get out of the post-cat o2's ... while .950 is pretty rich. If you're running N/A, you would probably want to be in the .850-.900 range ... if you are running juice, you would want alittle higher then that. Also remember the o2's are not accurate at WOT, and the best idea is to get it on a dyno with a wideband, and compare the results the wideband has, with your o2 readings, so you know exactly what a/f ratio corisponds to what mV readings for your particular car.
One you get the car tuned, have it leaned out alittle, and some timing added ... I would say you could definately pick up 15-20rwhp.
.
03-14-2004, 02:54 AM
#4
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That is really odd ... I have never seen the o2's give 2 different values at WOT ... technically the car should always be around the same ballpark. You didn't change anything between these 2 runs ... like you were missing 4 injectors during the first run, then popped them back in for the second one, right?
.
That is really odd ... I have never seen the o2's give 2 different values at WOT ... technically the car should always be around the same ballpark. You didn't change anything between these 2 runs ... like you were missing 4 injectors during the first run, then popped them back in for the second one, right?
.
03-19-2004, 07:35 AM
#5
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Like starving lean, and then COT kicks in? The
cat overtemp protection is supposed to put you
at something like 10:1 AFR.
Getting the pre-COT mixture right should help
you big-time. If your pulls are running you into
COT this might (?) be just on account of being
so lean but if it still happens after being properly
fuel-tuned then you may have to have the COT
threshold or delay raised (unless you have no
cats to protect, then you just delete it).
cat overtemp protection is supposed to put you
at something like 10:1 AFR.
Getting the pre-COT mixture right should help
you big-time. If your pulls are running you into
COT this might (?) be just on account of being
so lean but if it still happens after being properly
fuel-tuned then you may have to have the COT
threshold or delay raised (unless you have no
cats to protect, then you just delete it).
