cwalsh

iTrader: (9)

I have hopefully a quick question. 1st my setup is a 383 HSR 30lb SVO injectors w/ MAF tuning in $6E. I am currently running an Ed Wright chip & when I datalog I find that when in open loop the car has BLM's in the 128 range like it should. When the car goes into closed loop the BLM's go up to 143-145 range, mostly stick to to 144. I did a lenghty datalog run from home to work & all seems OK but that one thing. What/where do I need to look for to help me figure out what needs a little tweaking. I am using Tuner Pro RT w/APU1 as well. If any other info is needed just ask, I am new to this

Thanks
Chris

ULTM8Z

At what operating conditions are you seeing the 144 BLM? Just normal cruising? What happens if you give it a little more throttle (but not quite into power enrichment mode)? Is it 144 at idle too?

Basically, what's happening is that in open loop the ECM will default to 128 since it's essentially not trimming your fuel based on O2 output. Once in closed loop, the ECM will start to trim your fuel. The BLM is simply a numerical indicator of how much trimming is actually going on. BLMs higher than 128 indicate that you're programmed lean and the ECM is adding fuel. BLM's lower than 128 indicate the opposite. Though at BLM of 144, it's sensing that the VE tables are a significantly "lean" and it's adding some more fuel for you. If it were me, I'd simply take the values in the VE tables that correspond to the operating conditions where the 144 is observed (say, part throttle at cruising rpm for example) and multiply those VE values by 1.125 (the quotient of 144 divided by 128). That should get you very close to 128 on the next go-around. AFter that, it may take only an extremely small tweak to the table if you're hell bent for a perfect 128.

cwalsh

iTrader: (9)

The 144 is only at idle. Anything above tip in is pretty close to the 128 mark. I am just trying to clean up idle.

Chris

ULTM8Z

That's pretty simple then. Just work the lower VE tables per what I said and you'll be good to go.

cwalsh

iTrader: (9)

thanks for the help, I'll post the results later
Chris

zz4350

I run my idle at 132-134 BLM to get a smoother idle because of my cam. I thinks it's that false lean reading due to cam reversion so your 144 may not be that bad depending on your set up if it's at idle alone. Without a WB I can't prove it.

cwalsh

iTrader: (9)

I have a new LC-1 still in the box. I guess its time to install it. I will probably play with it some tonight if I have time.

Chris

CriSSes

I'm a little confused. cwalsh said he is running MAF with 6E in the first post. Yet, the replies are talking about tuning VE tables. Oh well, that aside, I have MAF with 6E and tuning idle in closed loop is difficult. I have a cam that is 224/230 @ .050 with 112 LSA. I use a LC-1 WBO2. I can get the BLM's to read 128 at idle, but the WBO2 still shows lean. I have tried adjusting the first MAF table and also adjusting the injector pulse width vs battery voltage correction with little success. I am currently running open loop with much better AFR control at idle, cruise, part throttle and full throttle.
I'm getting ready to cross over to the "dark side" of SD just for the experience of trying it to see if I can improve upon the car's current performance.

ULTM8Z

You're right!


I always default to the 7730 8D because that's what I have experience with.


So, cwalsh, just do the MAF equivalent of what I said!

cwalsh

iTrader: (9)

which is adjust the MAF tables? I do plan on going to SD some time but not quite yet. I am still collecting parts.