2JZGTE AFR's

**dnegative** · 21-01-2013, 07:27 PM

Dropped the car on the dyno today to see what was what, ran alright for 13psi or whatever it was but the AFR's look a little odd to me. Looks like the moment the second turbo kicks in the AFR drops like a stone, which is good, means I can screw in more boost up top without issue (hits 10:1 lol) but its the first part that I'm more interested in. Car has a Gizzmo EBC and a Sard FPR (set to unknown, car used to run 16psi boost, hence why its rich as fuck up top), any ideas?

The bloke there wasn't of the opinion that it was majorly bad but he has never really touched a factory twin 1JZ/2JZ so he couldn't instantly tell me if it was normal.

**ajansen** · 22-01-2013, 12:09 AM

Are you running standard management? Thats pretty rich.

Also the sard FPR is 2:1 ratio with boost. So 1psi increase in boost is 2psi extra fuel pressure, not sure what stock is but this may explain why its going soo rich.

**stealth** · 22-01-2013, 12:39 AM

Has your tps ever been touched? If the calibration is out it wont make the switch from cruise to WOT properly so youll get the little spike in afrs just before boost builds.

As for all the fuel under boost, i reckon alex just above has the idea... Too much fuel pressure for what ever tune it has...