I threw my car on the dyno the other day and it dips below 11.5 AFR between 5-5.5k, I don't understand what the problem is. That's probably about 10 extra hp/torque just sitting there if I can solve that problem, and I really don't want to fuck up my head gasket either (that's REALLY lean, trust me..)

It has modified/flashed ECU upgrades, the shark injector I used is coded with dyno-tested software, so it can't be the chip.

I'm thinking fuel filter maybe?

 

fbigger fuel pump,injectors,fuel pressure regulator, fuel controller or new engine management.......

 

11.5:1 is pretty rich...

 

I don't have a fucking T88 on it.. lol.

 

EXACTLY!!!!

 

Lean that out a little, that's good for a few HP if you're up in the 11.5:1 range..
The program you got was probably tuned for a car with a different setup or more mods..

 

you said you were running lean, so that shit will make it run rich,and yea, 11.5.1 is pretty rich.......

 

Ahh I showed the graph to someone and the first thing they said was lean, sorta stuck with me, but yes 11.5:1 is rich, which makes things HARDER?! Shit, that's bad for the cats/o2 sensors too right? I'm going to bitch at my chip tuner now.. brb.

edit: I don't really know, it's only around 5-5.5k where the engine needs a lot of fuel, if the dyno was correct in the first place.



edit #2, now I know why my mileage SUCKS with this chip

 

It's not really that rich. Get a afc.

 

I wonder if the power difference in the first run was due to the more rich AFR, if so I want to fix this..