[Frosty]

I think my car is running lean but not sure why as it's running the stock tune and, as far as I'm aware, stock pulley. Been watching the AFR gauge in the car and I know its not perfect but the car is always 13.5-13.6. I get that while cruising (seems a tad rich but whatever) but under WOT it's still fetching 13.4 to 13.6. Shouldn't the stock tune be showing high 11 to low 12 under acceleration under boost?

I know this gauge isn't the most accurate tool but I would expect it to be moving more between throttle and cruise. No codes and running 93 pump gas which is 10% ethanol. Not sure if this has changed or not as I've never really watched it. I've always just paid attention to intake air temps.

 

[Denver 3d printing]

That sounds very lean under WOT how long are you holding open to get this number. When I was watching mine on the track it would start high then move down to where I wanted it or where I had been tuning to. Takes a few seconds it’s not a blip of the throttle. You should also beable to put it on performance pages with a graph over time.

 

[Frosty]

Couple seconds. Tested today. Watched it as I merged onto highway. Slowed down to about 15/20, shifted to 2nd and punched it to about 75. Never saw lower than 13.4.

 

[baabootoo]

Get a different gauge and see if it pulls any timing also. On long, top gear runs at Road America, I'm always in the 12's on this gauge.

 

[baabootoo]

 

[parttimer]

Isn't stoich or whatever it's called 13.5 for these? My tune shows 13.5 on pump gas, 9.5 on E85.

 

[juanagofast]

Isn't stoich or whatever it's called 13.5 for these? My tune shows 13.5 on pump gas, 9.5 on E85.

#Speedy would know

 

[Speedy]

It'll be 13.5 until power enrichment. It'll stay 13.5 in black key mode as it never enters power enrichment. Your car is performing normally, you probably didn't stay in the gas long enough to get in to power enrichment is my guess.

 

[Frosty]

It'll be 13.5 until power enrichment. It'll stay 13.5 in black key mode as it never enters power enrichment. Your car is performing normally, you probably didn't stay in the gas long enough to get in to power enrichment is my guess.

Appreciate it. I'll keep a closer eye on things next time I can run it up a bit more.

 

[Sarna March]

Do you have an aftermarket exhaust system?

 

[Frosty]

All mods are in my signature. Exhaust is stock with the kit to keep the valves open. Has a JLT on it but I got it for sound vs "performance" as I bet it gives 0 extra HP. But that louder SC whine is worth it.

 

[Sarna March]

So much for the "leaner due to better scavenging of exhaust" theory.