Quote:
Originally Posted by phrosty
Is there something other than the OL fuel table affecting this?
Shiv's OTS has between 12.4-12.5 at high RPM/load in the table, which doesn't sound like the safe "rich" description I've heard people give his tune. jamesm suggests high 11's, low 12's in the same area -- that's more what I was expecting.
The stock ROM actually seems to run considerably more fuel, going as rich as 10.1. |
As far as i know ol fueling is determined by maf , ol fuel table and the stored ltft.
If your ltft is negligable and your ol maf scaling is good the commanded afr ie value in ol fuel table for that load/rpm should match the measured afr. Assuming the 02 sensor is good.
I dont know how the stocck rom could read 10.1 afr as the stock 02 scaling does not go that low, the oft guys did adjust the o2 scaling a bit to read in the 11 afr.
I also suspect that they deliberately use the top end ie the ol part of the maf scale to make their tunes run a bit rich.
As you have now scaled your maf correctly you have removed this , so if you now want to run 12.1 afr you will need to adjust the higher rpm load area of your ol fuel table from 12.4 to 12 or whatever you want to run.
As i said before this is where you rearly need a dyno to see if you afr changes make or lose power, while checking your knock free at higher rpm
also run it past @
jamesm as he is a tuner and i am not :-):-)
