i will get the graph scanned and have it posted tonight or tomorrow. the x pipe is an o/r pipe.Blown46Cobra said:Good results!! Would you mind replying with your numbers in 100 rpm increments from 4000 to your max rpm for one of the pulls? I'm looking for some numbers for comparison. Is you x-pipe catted or an o/r?
Then why did my a/f change, and why was there a 16rwhp difference between having my Maf turned straight up, and at the 3 o'clock position?Chris Yates said:Rotating the MAF is not going to change the a/f ratio. The a/f ration is determined by the o2 sensors during closed loop driving. Those tables are then used for WOT. I agree his numbers are rich but very "stock" according to Ford (for 96-98 Cobra). In the 99+ cars they leaned the mixture up significantly (WOT). If you want to lean it up, get a tune/chip.
my gas mileage is fine. its about ~20mpg with my 4.10s. i'm using NGK TR-55 gapped at .054".32VHEMIJR said:Definetely too rich. That's pig rich and then some. I start at about 12.5:1, then lean out to 13.4 by the time I reach redline. Make sure the guy has a reliable (wideband) a/f sensor before accepting those numbers as being true. Rotate your MAF to the 9 o'clock position if you want to lean it out some. I wonder if your O2's are still good. If one or two of those are shot, the symptoms can include running rich and really crappy mileage. How is your mileage? Are you running colder than stock plugs?