Rhino79

iTrader: (7)

I recently tuned a friends car, it's a bolt-on only car with Lt's and Magnaflow cats. I used the hole in the header collector to install my wideband in cause the one that was installed at the muffler shop had some of the weld inside the hole and my sensor would not go in. I use a PLX SM-AFR and have always had god luck with it, and I got John's AFR ratio basically inbetween 12.9 and 13.0 from about 4500 rpms and up, it being a bit richer at 12.6-12.7 below 4500. Here is the screen shot from the log file:



Now, he dynoed it yesterday and put down good numbers in my opinion at 344 hp and 356 tq, they used a wideband in the exhaust tip and it read 13.5 or 13.6, which I think could be because of the cats and how far downstream it was. I just want to get some other opinions on which one you guys think seems more accurate.

Thanks, Ryan

Doc

iTrader: (9)

Sounds like the cats are doing what they are supposed to do.

Rhino79

iTrader: (7)

I thought so too. Because the car wasn't getting any KR either so, surely if it was that lean, it would've gotten some.