The car 05'GTP, 3.8" pulley, slightly larger than stock exhaust, 3" intake with K&N behind the headlight, Knock sensor issue resolved. Honeycomb found and reinstalled into the MAF.
Ok so I have had this issue for a while and I have the computer not letting me go into boost and getting 0068 and an O2 sensor low reading yesterday after doing a full throttle run. Well I have gotten this same issue before, I am thinking that the O2 reading low is just because it is dead rich so the chart drops to 0V out. I didn't get a good log last night because I forgot to reset the interval to 100ms instead of 5 seconds. I will try again tonight and then see if I can get the readings graphed into a spreadsheet and properly scaled so they are readable. Either that or I'll post them as different images.
Another odd thing is once the MIL was set the O2 maxed out lean reading .9V or so and pretty much stayed there unless I let off the gas then it dropped to 0V or dead rich. I cruised home and it was lean the whole time, but I was just at cruise and watched everything else. Timing stayed in the 30* range and but the normal spikey back and forth of the O2 stopped. When I was able I pulled over shut the car off in park, opened the door, closed the door and restarted the engine and everything went back to normal.
That brings me to my question. What is a normal WOT CFM reading at near 4K RPM? I have gotten as high as 2000 cfm. My car idles around 50 cfm and cruises at about 200 cfm and will go to about 650 or so at brisk acceleration at about 5-7" Hg. Normally I will see peaks of 1400 to 1600 CFM, of course the engine still lays over.
Now recently Scottydogg stated that my MAF may be bad and I trust his information, but I do not replace parts that I can see as working just to see if it's the problem unless I happen to have a spare, as that gets really expensive so I want to be absolutely positive that that is the problem.
Recently I logged the same data on a 14' Impala 3.6 and had similar readings but only had about 1400-1700 cfm max at full throttle through 1st and 2nd gears. It's a smaller engine but has a higher output of 305HP.
It takes a lot of air to make horsepower so I am waffling on whether or not my MAF readings are too high and that is why I am having the issues I am having.
If it is the MAF, what other cars can I pull from? Anything from 04+ or does it need to be an 05'?
Jeff
Ok so I have had this issue for a while and I have the computer not letting me go into boost and getting 0068 and an O2 sensor low reading yesterday after doing a full throttle run. Well I have gotten this same issue before, I am thinking that the O2 reading low is just because it is dead rich so the chart drops to 0V out. I didn't get a good log last night because I forgot to reset the interval to 100ms instead of 5 seconds. I will try again tonight and then see if I can get the readings graphed into a spreadsheet and properly scaled so they are readable. Either that or I'll post them as different images.
Another odd thing is once the MIL was set the O2 maxed out lean reading .9V or so and pretty much stayed there unless I let off the gas then it dropped to 0V or dead rich. I cruised home and it was lean the whole time, but I was just at cruise and watched everything else. Timing stayed in the 30* range and but the normal spikey back and forth of the O2 stopped. When I was able I pulled over shut the car off in park, opened the door, closed the door and restarted the engine and everything went back to normal.
That brings me to my question. What is a normal WOT CFM reading at near 4K RPM? I have gotten as high as 2000 cfm. My car idles around 50 cfm and cruises at about 200 cfm and will go to about 650 or so at brisk acceleration at about 5-7" Hg. Normally I will see peaks of 1400 to 1600 CFM, of course the engine still lays over.
Now recently Scottydogg stated that my MAF may be bad and I trust his information, but I do not replace parts that I can see as working just to see if it's the problem unless I happen to have a spare, as that gets really expensive so I want to be absolutely positive that that is the problem.
Recently I logged the same data on a 14' Impala 3.6 and had similar readings but only had about 1400-1700 cfm max at full throttle through 1st and 2nd gears. It's a smaller engine but has a higher output of 305HP.
It takes a lot of air to make horsepower so I am waffling on whether or not my MAF readings are too high and that is why I am having the issues I am having.
If it is the MAF, what other cars can I pull from? Anything from 04+ or does it need to be an 05'?
Jeff
