AFR on N54 Tuning

[Biggenz]

Why are most people tuning the N54 to run around 12afr on WOT when it's a direct injection engine?

 

[V8bait]

Well that's a rather broad statement and fails to address the use of different fuels, different builds, PI or meth incorporation etc.

 

[STE92]

Can you expand on the subject a bit, please. Really appreciated!

 

[Biggenz]

Well that's a rather broad statement and fails to address the use of different fuels, different builds, PI or meth incorporation etc.

Across the board really but lets say pump only for this.

 

[V8bait]

Across the board really but lets say pump only for this.

On pump only I target richer than 12's lol. Lets see:

-ACN91 with high boost: low 11's
-Race gas like C16 or E85, DI only: high 12's or low 13's depending on boost like 12.7:1 to 13.1:1, unless you live in Germany
-E85 with PI: mid/low 12's depending on how much PI
-Pump with meth: 11.8 to 12.2:1 depending on situation
-E85/race gas with meth: high 12's low 13's

Going leaner into the 13's works fine with DI if you have good octane but when you start adding things like PI and ACN91 into the mix, DI isn't going to save you from knock. A little richer is a bit safer as the EGT's get cooking on long pulls too so it's something to keep in mind.

 

[Biggenz]

On pump only I target richer than 12's lol. Lets see:

-ACN91 with high boost: low 11's
-Race gas like C16 or E85, DI only: high 12's or low 13's depending on boost like 12.7:1 to 13.1:1, unless you live in Germany
-E85 with PI: mid/low 12's depending on how much PI
-Pump with meth: 11.8 to 12.2:1 depending on situation
-E85/race gas with meth: high 12's low 13's

Going leaner into the 13's works fine with DI if you have good octane but when you start adding things like PI and ACN91 into the mix, DI isn't going to save you from knock. A little richer is a bit safer as the EGT's get cooking on long pulls too so it's something to keep in mind.

Would you tune exactly the same on a PI engine?

 

[V8bait]

Would you tune exactly the same on a PI engine?

No I would tune richer usually assuming it's boosted. ACN91 on a PI engine is high 10's to low 11's, race gas and E85 is 12.1:1, etc.

If it's a build specifically for a certain fuel that can change things, and N/A cars that changes things, and maximum RPM also changes things. Have to run a little richer at very high RPM usually.

 

[STE92]

How about Meth PI?

 

[V8bait]

Well that one's tough, how much do you trust your meth and what's your base fuel? General rule of thumb with meth is I tune for the base fuel and use it as safety net, but with port meth you're looking for power so probably lean and hope it doesn't have issues.

 

[STE92]

Sadly 91 ACN, my meth kit is pretty solid. Good pump, all steel braided, solenoid keep system pressurized and also running injectors.

 

[PUTC]

I’m still pretty new to tuning. I’m aimim for 12.7-13:1 at high rpm and boost on just 93oct. Tuning the timing is something I’m still trying to figure out. My biggest issue is still not being able to log and busy life, not being able to get onto tunerpro often after changing something. I’ve always felt you can’t go wrong with more fuel though, problems come with too little

 

[doublespaces]

Sadly 91 ACN, my meth kit is pretty solid. Good pump, all steel braided, solenoid keep system pressurized and also running injectors.

I have ACN91, its pure neglect to use it on my car I feel. Since we have E54 from the pump I've never looked back, even my lazy ass who has to drive 30 mins to fuel up.

 

[STE92]

Where u get your e?

 

[doublespaces]

Where u get your e?

There is a station at Elliot and the i-10 in Tempe, 15 mins one way aprox.

 

[V8bait]

There is a station at Elliot and the i-10 in Tempe, 15 mins one way aprox.

Kids these days, that's not even bad. In my day I used to make an hour and a half trek every month to fill up a bunch of gas cans with e85 to mix to e50. Worth it.

 

[doublespaces]

Kids these days, that's not even bad. In my day I used to make an hour and a half trek every month to fill up a bunch of gas cans with e85 to mix to e50. Worth it.

I'm 33 on Saturday, its more attributed to my massive lack of motivation for something like fuel.

 

[Swedishpowah]

Man, I feel spoiled here in upstate SC. Got e85 stations all over the place - hurts to read about folks in other parts of the country that don't have easy access to e.

 

[dyezak]

No shit. Back in the 90’s every rave I went to had plenty of E.

I hear about these shortages now and it saddens me.

 

[chadillac2000]

Man, I feel spoiled here in upstate SC. Got e85 stations all over the place - hurts to read about folks in other parts of the country that don't have easy access to e.

Spinx FTW. I mix a batch of E40 up there weekly.

 

[langsbr]

Man, I feel spoiled here in upstate SC. Got e85 stations all over the place - hurts to read about folks in other parts of the country that don't have easy access to e.

Other parts of the country? Hell just in the Midlands it's impossible to find. Damn Brandi replaced all the e85 pumps with ethanol free 85 or 87.