I've been spending quite a bit of time lately with my wideband trying to perfect my fuel curve (targeting 11.2 across the board at WOT) and I think I've finally got the table values that achieve this.

For all you Evo IX out there, I was curious what your fuel tables look like and the actual AFR you're hitting with those map values. How about posting some screen shots of your fuel tables and the corresponding actual AFR's you're seeing in your widebands? Don't forget to specify the range that you have lean-spool enabled, if at all.

Thanks in advance.

 

Nobody?

 

This is my fuel table with no lean spool and 780cc PTE's scaled. At full boost (23psi) I see 11.4-11.5 across peak torque and 11.6-11.7 to redline holding 20.8-20.6:

 

Wow you run your car pretty lean... i dont say its not safe but definitely its leaner than many of the setups i have seen....do you run this on 93 octane i assume...

22psi spike on 93 i run 11 flat up to 6500rpm and the it even goes richer to a flat 10.8 up to the rev limiter at 7800rpm...

Today with 110 degrees intake temps i got 303whp (Dyno Dynamics)... Probably if i get it to around 11.5 i could see even higher, however today it wasnt the day...

 

in my opinion:

11.0 rich
11.5 ideal
12.0 lean

 

so 11.0 @ spool, 11.5 @ redline?

why are the stock maps so much different - I think stock is 12.5 spool and 10.0 redline...

 

during spool up I like 12.5, 12.0 then peak boost 11.5 and hold that to redline, it's a personal preference.

the stock tune is rediculously conservative, this is why many of my customers report much better gas mileage after I'm done tuning them provided that they don't change their driving habbits.

 

That is where my car makes optimum power and is still very safe. Last week at the track the track temps were 118 degrees and I was seeing inlet temps approaching 132 degrees. The car did not knock anything above 1 and not across anymore then 400RPM=nothing. I would call that a great testiment to the A/F ratio is safe . You are not being anymore safe running 11 or below A/F then I am and you surely are not making the best power to redline you could with that A/F ratio.

 

Posting a fuel map means nothing unless you post the corresponding AFR that you are hitting. This is because some people like me are running on re-sacled stock injectors. I have my set @ 472 instead of 513 since my fuel trims were going rich. I had to re-set my fuel map based on the 472 setting.

Here is my fuel map




And here is the AFR. Two back to back logs in 4th gear. I get the same AFR in 3rd and 4th gear.

 

NJ, I take it you have lean spool disabled?

 

No. I like lean spool. But I extend it from the stock 7000 rpm to cuttoff.

 

These afrs were how my previous tuner tuned the car. No complaints the car made power but i can clearly see around 10whp more if i "lean" out the car a little bit...

10.8s in the upper power band its for those with like highway runs and keep the car on WOT for long periods of time...

i believe that with my driving habits the car even with high 11s would be safe as the only extended WOTs it sees is at the drag strip where again the car never accelerates for more than 12 seconds...

when i have time and the weather becomes cooler i will have another dyno session by myself or with a tuner to maximize the car's capabilities...

 

Not to get into yet another argument but..........

I've seen pistons melt at mid 10's AFR's. I've also done extended highway pulls in a long geared boosted car running mid 12 AFR. Extra fuel doesn't keep the combustion chamber cool and I have pictures of pistons to prove it.

 

Dan - I think we have been through this before - but what are the AFR's you like to run? specifically during spool, peak torque and to redline?

cheers
dave

 

What else has to be done when re-scaling the stock injectors? I'm seeing 10.9-11.1 AFR at 6000RPM even though I should according to my fuel map It should be hitting 9.0. It seems to me that I might have to re-scale to get my actual values to match up those of the map....

Thanks in advance- I'm a newb.