Z31 trying to learn to tune
Posted: Sun Jul 24, 2022 5:07 am
wondering if anybody would be willing to take a look at my tune and offer any advice...
z31
hx35
old benz 490cc injectors (have have seen people say theses are anywhere from 420-490cc) the pn on my injectors when looked up on witchhunter show 490 at 3 bar
fuel pressure set to 43.5psi
intercooled with lots of piping
stock maf
nistune withOUT feature pack
when using "resize injector" feature from stock 180 to benz 490 it show k value of 222. at that time the car seemed to drive best under low load at 222-220 k value so im guessing that the k value is somewhat close.
when I first used resize injectors I selected the auto adjust load scales box and it seemed to mess up a lot of the tables and load scales. I went back and started fresh with just changing k value to 220 then found my max load (around 70 TP(index)) and set my max load for fuel and ign to 75 and interpolated back from that.
few questions?
1. when initially tuning k value should i be using a base map and load scale to cruise in while trying to obtain around 14.7afr?
2. when adjusting load scales for fuel and ign how can I be sure that the load scale aligns properly with the columns on the map?
I think this is how I devolved blow by with the last engine.. i think my load scales were off causing the curser to access columns in the ign map that were too far left or too far right (so way too much timing or way too little)
3. can I assume that if I replicate the load scale graph from a base table to my load range that the timing map will be somewhat properly aligned with the load scale?
z31
hx35
old benz 490cc injectors (have have seen people say theses are anywhere from 420-490cc) the pn on my injectors when looked up on witchhunter show 490 at 3 bar
fuel pressure set to 43.5psi
intercooled with lots of piping
stock maf
nistune withOUT feature pack
when using "resize injector" feature from stock 180 to benz 490 it show k value of 222. at that time the car seemed to drive best under low load at 222-220 k value so im guessing that the k value is somewhat close.
when I first used resize injectors I selected the auto adjust load scales box and it seemed to mess up a lot of the tables and load scales. I went back and started fresh with just changing k value to 220 then found my max load (around 70 TP(index)) and set my max load for fuel and ign to 75 and interpolated back from that.
few questions?
1. when initially tuning k value should i be using a base map and load scale to cruise in while trying to obtain around 14.7afr?
2. when adjusting load scales for fuel and ign how can I be sure that the load scale aligns properly with the columns on the map?
I think this is how I devolved blow by with the last engine.. i think my load scales were off causing the curser to access columns in the ign map that were too far left or too far right (so way too much timing or way too little)
3. can I assume that if I replicate the load scale graph from a base table to my load range that the timing map will be somewhat properly aligned with the load scale?