Why 11.7 commanded if thats too rich?

[99Hawkboy]

Hi there!

I am trying to tune my MAF curve after the new ls6 intake and pp/tb and noticed that commanded afr is 11.7 and I am currently around 12.2. But isnt that too rich? Shouldnt I be somewhere around 12.8 afr at WOT?

[Dragman]

yes 12.8 or so if N/A!

[WS6FirebirdTA00]

That is why you need to tune it

[12secSS]

Did you set your PE table to 1.14? If so then you forgot to disable your COT (Cat Over Temp) protection.

Doesn't really matter, so long as the commanded afr and actual afr match.

[99Hawkboy]

haha.. yeah i realize i need to tune it.. Obviously I am doing something wrong then.

Right now I am using pretty much a stock tune. Havent really messed with VE table or MAF frequency table. The only thing I have really messed with is spark table, trans tables and torque management.

When I use the histogram for MAF- AFR error % I am within 1-2 % untill I go WOT. Then the upper band shows 3-4 % off. When I check the MAF- Commanded AFR histogram it shows commanded is 11.7. But Why would it be commanding that stock if I should be at 12.8. I havent messed with PE tables and I disabled cat overtemp protection.. Because I dont have them anylonger. I also disabled EGR and 2ndary air injection.

[99Hawkboy]

Right now My Power Enrichment EQ Ratio is vs. RPM is set to 1.250 across the board.

[99Hawkboy]

lol.. Sorry about all this guys.. Just curious. If I change the PE table to 1.15 for commanded 12.78 is that all I have to do? Then how would I change the actual MAF curve to equal commanded?

Thanks everyone

[WS6Fury]

Yup, change your commanded PE to whatever it is you want. In this case WOT 12.8-13.0. You will have different AFR's for different ranges of cells but up top they all hold the same.

[99Hawkboy]

Yup, change your commanded PE to whatever it is you want. In this case WOT 12.8-13.0. You will have different AFR's for different ranges of cells but up top they all hold the same.

Ok cool.. That was easy.. How about Adjusting the MAF curve to equal commanded afr?

Do I just take it for a cruise and try hitting as many cells as possible without entering PE mode or do i go into PE Mode?

Thanks

[pdsq98gt]

It doesn't matter if you go into PE mode because PE is just a multiplier. Since you have a WB, just multiply the MAF curve by the AFR error. It'll come in line very quickly if your VE table is propperly setup.

[99Hawkboy]

It doesn't matter if you go into PE mode because PE is just a multiplier. Since you have a WB, just multiply the MAF curve by the AFR error. It'll come in line very quickly if your VE table is propperly setup.

Sounds Great! Thanks for everything guys!

[LazMan]

It'd be 'safer' if you tune your MAF first - while your PE is still set rich, then when its in-line set the PE to 12.8:1 AFR and then 'tweak' your MAF.

That way you dont run the risk of setting a commanded 12.8 AFR and getting 13.7 AFR (or something) in reality while you tune the MAF.

One run probably wouldn't harm anything but I just prefer to tackle it the other way around.

[pdsq98gt]

Good idea.

[99Hawkboy]

It'd be 'safer' if you tune your MAF first - while your PE is still set rich, then when its in-line set the PE to 12.8:1 AFR and then 'tweak' your MAF.

That way you dont run the risk of setting a commanded 12.8 AFR and getting 13.7 AFR (or something) in reality while you tune the MAF.

One run probably wouldn't harm anything but I just prefer to tackle it the other way around.

Yeah I probably should have done that.. Now I have a another set of issues with spark knock at wot which I have a thread going for right now.. Still have to tweak with the car on this one..

[Nitrous]

I agree with LazMan, are you using a WB to log MAF HZ? If not, get you one to make life easy.