lean at wot help help

[BANDAR]

hi need tuner eyes please problem is fuel cut off at wot
mods
ls1 stock bottom prc heads cam 236/248 612 612 110
fast 36lb injectors
walbro fuel pump ( i have tested at wot its around 65-70 )
tr55 ngk
stock tps

[c.u]

Your tune is locked. The AIT is staying at -38 may want to look in to that first.

[BANDAR]

before install cam it was -38 IAT and its work fine
sorry for tuner locke her is open

[Russ K]

Your calc airflow P1514/0068 error table needs to be higher (your tune is all 0's) than your cylinder air in the scan log. Also your maf cylair max table is all 0's.

Russ Kemp

[BANDAR]

Your calc airflow P1514/0068 error table needs to be higher (your tune is all 0's) than your cylinder air in the scan log. Also your maf cylair max table is all 0's.

Russ Kemp

i have late model i think calc airflow P1514/0068 for electronic throttle i have wire throttle and i never miss with it and maf cylair max table is all 0 same thing never change it ?
what do you mean a bout (your tune is all 0's)
thanks

[Russ K]

Ok, I thought you had a DBW, not a DBC. Post your stock tune.

Russ Kemp

[BANDAR]

stock file

[Russ K]

Tune your upper Maf Hz cells. Your Maf table is a lot lower than stock above 9000 Hz. And your very lean at the lower Maf cells. Use the VCM controls to engage 2nd gear when WOT tuning to slow the accel rate to fill in the Maf cells.

Russ Kemp

[BANDAR]

air mass size 90 mm that reason of lower than stock above 9000 Hz

[BANDAR]

any one ?

[BANDAR]

it was wideband sensor

[gn2beatu]

Multiply your higher MAF tables by the % lean. So if your going WOT ~8000hz, then from 8000hz on up, multiply by the same amount. Example, your seeing WOT AFR of 13.5 and you want 12.5. Take 13.5/12.5 and you get 1.08, so multiply your maf cells from where you hit WOT to the rest of the curve by 1.08 and you should be close to 12.5afr. To answer your question a larger TB will flow the same amount of air at a lower speed, resulting in the MAF seeing less air/velocity. Since it is seeing less air it will add less fuel, resulting in a lean condition. Trims fix it at regular throttle, but wont fix WOT. So tune the MAF curve and you will be good.

You should fix the air temp sensor as recomended, as it uses that for fueling/timing.