Went back to stock, different AFR?

[azynneo]

Originally Posted by Apoc

You need to go to a tuner. Running 14 AFR with FI is bad. You seem to have little knowledge on what you should be expecting for datalogs on a supercharged FA20. You need to get educated.

Running 14 AFR while cruising is bad? I mean I go to 11-12 WOT.

[Turdinator]

Originally Posted by azynneo

Running 14 AFR while cruising is bad? I mean I go to 11-12 WOT.

You aren't very clear on what is happening. With a supercharger you want to be around 12 - 10 on WOT and around 14 on cruise.

[azynneo]

Originally Posted by Turdinator

You aren't very clear on what is happening. With a supercharger you want to be around 12 - 10 on WOT and around 14 on cruise.

Sorry, that was what I meant. Yes I am around 11-12 on WOT, and around 14-15 while cruising. (this is with stock), before it wasn't hitting 10-12s at all it was super lean.

[Apoc]

Originally Posted by azynneo

Running 14 AFR while cruising is bad? I mean I go to 11-12 WOT.

You need to figure that out. Do some reading on closed loop and open loop fueling and get a good understanding of what you should see for a safe AFR especially if you are supercharged.

[azynneo]

Originally Posted by Turdinator

You aren't very clear on what is happening. With a supercharger you want to be around 12 - 10 on WOT and around 14 on cruise.

So from what you're saying I'm pretty safe right now since I am around 11.1-12 while going wot. I cruise at 14. Bill tuned the car himself and test drove it both times when I had stock and the jdls he never mentioned anything. Switching back to stock now(and now that i have an afr guage) I just noticed the difference in AFR

[D_Thissen]

Originally Posted by azynneo

So I went back to stock from JDL and as I accelerate my AFR normally reads 14.5 on average and doesn't move much while on my JDL. Now I'm back on stock and as I accelerate it drops down to 11.1 and sits there until I shift back up. Is this normal since there is more air restriction?

Originally Posted by azynneo

UEL Headers, Perrin cbe, frontpipe is catted, jdl overpipe

Originally Posted by azynneo

When I'm cruising now it stays around 14-15. When I go WOT it drops to 11-12. I'm using stock intake with a drop-in filter.

As for the JDL's I would go WOT and I'd hit maybe 13.8-14 there would be a very small chance I'd hit anything lower than that.

If this is normal it'd be nice, I was just afraid of my crap blowing due to low afr.

Originally Posted by azynneo

Running 14 AFR while cruising is bad? I mean I go to 11-12 WOT.

Usually at idle your AFR is around 14. As your accelerate in WOT they should go into the 11-12 range, or even into the 10-11 range if you're boosted. This means the air fuel ratio is becoming richer. So what exactly is happening? You shouldn't run a supercharged tune when your not supercharged.

EDIT. Are you boosted or na?

[azynneo]

Originally Posted by D_Thissen

Usually at idle your AFR is around 14. As your accelerate in WOT they should go into the 11-12 range, or even into the 10-11 range if you're boosted. This means the air fuel ratio is becoming richer. So what exactly is happening? You shouldn't run a supercharged tune when your not supercharged.

EDIT. Are you boosted or na?

I'm boosted with innovate stage 2

[WHITE]

Alrite, now that I'm not half asleep here's a real quick real dumbed down understanding of your afr when using gasoline(e85 is different).

(i do suggest you do some googling on closed loop and open loop tuning, as well as afr so you better understand what your engine and its computer are doing)

14.7 is your "eco" afr, its when the mixture of fuel and air is just right to burn all the fuel being introduced into the engine.

This number should be seen when idling, cruising.

Once you go WOT you afr will drop below 14.7 meaning your adding more fuel to the engine.

When you decelerate, lift off throttle, your afr will briefly go above 14.7:1 but then begin to drop back down and rest at 14.7:1.

And here is a crappy chart to help you understand rich and lean,


Higher then 14.7:1 = lean(more air then fuel)

Reading of 14.7:1 = stoichiometric(right amount of air to burn all fuel)

Lower then 14.7:1 = rich(more fuel then air)

Lean(bad)
Stoich(okay for no load)
Rich(safe)



For boosted setups you want to be running rich.