Dyno, is A/F that important

**karpetcm** · 02-13-2009, 08:25 AM

Well im gonna go ahead and dyno my car this saturday, its not the best weather to do it in will most likely be about 50-55 degrees outside with high humidity but im gonna go for it either way. Last time i tried to dyno my 93Z we attempted to plug in to the O2's to get the A/F but it was hard to do so because the car is lowered and its not exactly an easy reach. He wants to put the pipe in the exhuast tips but i told him that wont read properly at all, since i have my exhuast cut out open and its too far back to begin with. Is it worth jacking the car up a bit getting to the 02's to disconnect and tap in there for a reading of my A/F. I have the following mods in my sig, thanks in advance.

**0rion** · 02-13-2009, 08:34 AM

yes.....afr is extremely important. I probably wouldn't even dyno your car if you couldn't read the afr.

**karpetcm** · 02-13-2009, 08:36 AM

I think im running a bit rich, even though in tunes your car gets a bit lean top end to pull that extra power out of it. I dont know if the car has more on the table as far as the tune and i could be running too rich still but then again i could be wrong and its running just right. Thats why i wanna get the A/F, ill call the guy at the shop and tell him i need the car to have the reading from the 02's so if he has to jack it up a bit to get to it then so be it. Hopefully with the way the car sits now i can pull 310-315 rwhp but i think ill be lucky to get that.

**Mr. Luos** · 02-13-2009, 07:14 PM

12.8-13.0 is ideal AFR at wide open throttle for an N/A car....if the shop has a wideband.

I am with 0rion....wouldn't take it there if they didn't.

**karpetcm** · 02-14-2009, 11:40 AM

Just got back from the dyno my A/F was 13.16 at 5375rpms max pull 335.75 RWHP and 349.12 RWTQ, i was very shocked at the numbers and wasnt expecting it at all. Steve did an excellent job on the tune.