silverTA2002

iTrader: (1)

Like the title says. Until I can get to a dyno, I'd like to get my PE relatively close.

I've go the VE table and MAF dialed in. A few questions... What should the PE curve look like? How much (%) more at different rpms? I know you should be slightly richer below peak tq and slightly leaner above, but, how much?

Also, for guys who have widebands, or have dynoed, please post the following:

1. Your PE table
2. Your o2 readings at various RPMS.

I know at WOT you should "shoot" for 890-900 o2 readings, but is that true at 2k rpms, 4k, and above 6k? Or should they read differently at different points?

brad8266

iTrader: (23)

I have my PE table set flat across the RPM range, set at 13.0. Works fine for me. My 02's are around 1075mV +/- a litte bit all across the board. If the AFR is the same all through the range then the 02 readings will be as well.

Tuning WOT without a wideband sucks.

Phil99vette

iTrader: (11)

I'd spend the 300 and get a wideband setup so you can tune everything the way it needs. You can't really get it dead nuts on with narrowband O2s, we have seen +-7% variation with factory O2s it could be as lean as 15.4 and as lean as 14.0.

silverTA2002

iTrader: (1)

If your MAF and VE are dead on, shouldn't A/F be pretty close to what is commanded?

silverTA2002

iTrader: (1)

I'm trying to save $$ for a clutch and rearend now. Not sure about the wideband (maybe in the future though).

If I go to a dyno, will 3 passes be good enough to get my A/F right?

brad8266

iTrader: (23)

YES, should be close. Keep in mind that when at WOT the maf will be up in the 7000Hz range and above, so if you didnt really do any tuning in that area during closed loop then it may still be off. I had to do a few WOT runs while logging to see how i was running in those MAF ranges, I then just adjusted those ranges to get it accurate.

Phil99vette

iTrader: (11)

I dialed in a car to +-2% of error and than recalibrated the MAF with a wideband. IMO everything should be perfect, VE is +-2%, MAF is +-2%. When I turned the O2s back on I saw LTFT correcting up to 8%. Wideband is calibrated correctly.

cantdrv65

iTrader: (3)

At WOT throttle if you have an error between commanded and a properly cal'd Lc1 it will be the MAF that needs to be tweaked... If the MAF is right the numbers will literally fall right on top of each other....

Phil99vette

iTrader: (11)

Thats correct, the 3-8% fuel corrections are coming in @ part throttle

silverTA2002

iTrader: (1)

So, what's more important for better part throttle and full throttle acceleration?

1. Actually dialing in 14.6 and 12.8 A/F ratios, but having +8% LTFTs.

or

2. Having your LTFTs at -2

Phil99vette

iTrader: (11)

The point of my post was to show how inaccurate the stock O2s are. Your LTFT may be -2 but in some cases they are not commanding the correct A/F.
Phil

Black02SS

iTrader: (36)

I've been saying that for awhile now. Totally agree with you on this one Phil. If you are in need of a wideband, you can pick up a LC1 under 200$ shipped. Pretty cheap insurance if you ask me.

silverTA2002

iTrader: (1)

Ok, so when you guys tune your part throttle VE table with a wideband, what do your LTFTs end up looking like?

silverTA2002

iTrader: (1)

Is the LC1 everything you need? (along with HP tuners)

What's involved in installing it?

joecar

In CLSD my LTFT's were within +/-2.0%.