Hi,
hope someone could share some advise on why my actual AFR hardly goes below 11AFR even WOT from 2500rpm til 7500rpm redline?

My fuel map is set at 9.7AFR from load 200 til 350 and from 5500rpm til 7500 rpm

Thanks

 

This thread is worthless without...... specs of your car, proper logs, maps. I doubt anybody can answer your question now.

 

Ok, will compile all the datas and post it here...

 

Normally, if you have a significant gap between actual AFR & map AFR then likely that MAF &/or injectors are not scaled correctly.
Many possible reasons for not being able to enrich AFR:
Maxed injectors
Bad fuel regulator
Maxed fuel pump
Bad fuel pump
Fuel pump electric wiring.....to name a few

Check your fuel pressure & try inserting values less than 9.7 & see if actual AFR changes

 

+1 to what Foxbat said.

Chances are you've simply maxed out the injectors.

 

Thank you so much foxBat.
Ive done numerous of scaling & latencies to suit my 850cc Sard injectors and the closes scaling on my WB AFR to Ecu NB02 AFR is 943cc and the Latencies values i got it frm Merlin tabulation.
I got an AEM Fpr, Aeromotive 340L FP and definitely doing below 380awhp.

My current biggest upset is, my AFR will deep richly til 10AFR & rpm drops til 300~400 whenever i throttle lift off which eventually caused idle & stalling problem.

Any idea on how to resolve my problem?

Have tried dialing the " Desired ISCV Initial Step Position with AC On / And so on" but with no improvement...

When im on my PFC ecu, ive no such issue at all but just always when i immediately WOT on any gear, my AFR will also deep til 10

Should i goes back to stock 560cc injector?

My Fuel trims Low & In Use is always at -4.65

 

You need to drop your scaling down. I would start around 750. My guess is then you will need to readjust your latencies.

Here are a couple examples of what others use on similar size injectors.
Quote:
Originally Posted by JohnBradley
PHP Code:
FIC 850s

Scaling 770

voltage-
3.312
1.68
1.032
0.84
0.552
0.456
0.36


Quote:
Originally Posted by Kracka
PHP Code:
FIC 850

Scaling 696

Latencies
3
2.376
1.2
0.768
0.504
0.36
0.312

 

What's your idle AFR? 10 afr shouldn't cause such rpm drop, it's a common evo issue with many causes/remedies. First, you need to make sure that the injectors are properly scaled. You must make sure that both MAF & o2 sensor are functioning well & you need to check fuel pressure.

 

Hi Will, yes ive tried numerous scaling & latencies from the Merlin tabulation but most of it is to rich 11~13.7 on idle.
The closes scale to 14.7AFR during idle to my injector is 943cc & my latency : 6.120 / 3.120 / 1.992 / 1.320 / 1.008 / 0.672 / 0.408

Thanks

 

Thanks Foxbat but how to tell is ive a MAF & 02 sensor problem?
My NB 02 reads abt 9v during WOT.

What i noticed is when im throttling, my FPR meter will goes up and when i completely lift off my Fuel Pressure will drops to the set pressure and immediately bounce back to high pressure again (Exmp : Set pressure 3.2bar / Pressure during normal rev 4bar / When completely lift off goes bck to 3.2bar but immediately bounce back to 4 bar and drop back to 3.2 bar).
This is the time my car rpm & afr deep and eventually stalled.

Truly fed up with the stalling problem.

Will it be better if i change bck to stock injector 560cc?
Im running on a 3076R / GSC S2 / 85.5mm pistons / 2.0L engine and looking for 380awhp.

 

Are you running full time open loop? Have you been resetting the ecu after each flash to rezero your trims? Do you have your rear O2 disabled? Are you venting your BOV to atmosphere?

Log MAF hertz to make sure your maf is good.

Your scaling and latencies are why you can't get below 11 at WOT. The ecu thinks you have bigger injectors than you really do.

As for idle and stalling, even if you dropped the scaling to 850, that would only be a 10%drop. The ecu has enough room to bring it to 14.7 in closed loop

Stock injectors are really working hard to get 380awhp, however to try to diagnose your problem, if you put the stock 560's back in and reset to stock scale and latency and it corrects the stalling problem, that would tell me it all has to do with your current settings.

 

Hi Will,
im not sure whether im running on a Full Time Open Loop and is there a way to check on the 6 ECU-PEREPHERY?

2) No i didnt re-set the trims most of the times after every flash & scaling + latency adjustment. Will it have big effect without resetting the trims as i will let it idle at least 5 minutes after every adjustment.

3) I think i dont hv the rear 02 for my Evo 5.

4) Yes, ive log the MAF Hertz on every logging and how to tell whether the MAF sensor is working properly or not?

5) Ive tried various scaling & latencies values but the closes is the value that ive stated above. The idle is at 14~16 range AFR. Crusing AFR is at range of 15~17.5

6) Yes, im on a VTA Bov

Lastly, how do we tell we are at which load cell? Say, im at 3000~3500rpm and the TPS is at 35% and which load cell its usually on? As sometimes my TPS reached 96.5% on 3000~3500rpm and which load cell am i on?

Thanks Will...

 

Have you succeeded to do, what you asked for in this thread: https://www.evolutionm.net/forums/ec...open-loop.html
??

In ECU Periphery you can check FAA bit4 (0 - full time open loop, 1 - closed loop on). This is on Evo 7-9 ECU.

 

No ive not try it out yet.

 

A couple things.

If you scaling in the ECU is higher then what the injectors are rated for, its wrong.

If you have an EVO 8 or lower, then yes, you need to reset the battery and the trims between each injector scaling attempt.

And the VTA BOV is NOT helping you. Go back to a recirculated setup.