2000 TA owner

iTrader: (1)

Went to the track today not happy with the runs I went 13.1 s three runs just think it should be better .I am getting knock retard and AFR was lean in log posted when I unplugged the maf AFR was 12 to 12.4 no log for that one Car is stock except yank 3600 ,slp lid ,3.73 gears,TSP long tubes and ORY any help would be appreciated

2000 TA owner

iTrader: (1)

This is the run

2xLS1

iTrader: (25)

That 60' is horrible for a yank 3600 unless you were spinning the tires really bad. Do you know what the DA was at the track?

2000 TA owner

iTrader: (1)

Yea I know the DA was about 2100 calculated it off the drag times app
It did correct it too 12.7 with good air but the 60 is what bothers me the most

Nicelysedate

iTrader: (3)

Have you tuned your MAF tables? And have you checked your fuel pressure?

2000 TA owner

iTrader: (1)

I have a mail order tune by LSX tuning but seems they didn't adjust maf in the hz range that I am running at WOT but unplugged it afrs in the low 12 range maf plugged in lean like 13/13.5 yea gonna look into it just have to do alittle more reading is this like the ve table higher # means more fuel

2xLS1

iTrader: (25)

Make sure the MAF is clean. (the 3 wires running across it) Disassemble it (4 screws) if it still has a screen and spray the wires with Berryman B12 spray carb and choke cleaner. Dynamic Airflow High RPM Disable is set to 4000 so from 4000 RPM and higher the tune is 100% MAF, not using the VE table. Now with the MAF unplugged and setting a MAF code it is using the VE table 100% at all RPMs. Yes bigger VE numbers means more air so the PCM calculates more fuel. Same for the MAF table numbers.

LSX Power Tuning

iTrader: (4)

Thats an easy fix, make a histogram for your Maf vs AFR Error (should already be one premade) just make sure its in the same format as your tune. I usually use Hz and then log the maf in Hz, they just need to match. That will show you the exact Hz where you need to add fuel. The other way would be just look at the Hz where your going to lean and multiply by 1.03 and that should get your fuel back to the commanded 12.7 afr. Hopefully that makes sense, I was trying to keep it short as possible. If it doesnt give me a call and hopefully I can explain it better on the phone.
With any mailorder tune, no matter who does it, you always have to check your WOT afr because its impossible to get everyone right through mail order without data logs.

2000 TA owner

iTrader: (1)

thankyou LSX I do have the Maf err vs AFR and it is showing that it is off by 3 to 5% Imultiplied that area by 3% my run ranges from around 7300 to 9500HZ thankyou again for the response and it has a brand new ac delco maf and thankyou also 2Xls1. I want to learn how to do this myself as much as possible