Honda Tune Questions .
 

94 civic coupe has a jap ZC sohc 16 valve motor swap..The under hood sticker says 16 deg base timing , which turns out to 22 degrees at idle and 44 deg max advance.This car is pretty strong for a civic. Fails etest for nox other tests are very good.
Compared to a stock civic we have on the lot . ( stock) timing at idle is 12 deg, max timing is 24-26 deg.
I,m thinking that this car has chipped /burnt computer , that the advance and fuel curves have been modded.
Do you think the timing and fuel curves have been advanced and leaned out a little to far??.
I,m thinking to set max timing to 26 deg and retest it .
What is the base timing spec for a zc and do you know what the max and idle timing specs would be , Thanks..77.
Has a air intake with k/n , plugs cap rotor and cat all new .
Failed nox by 800 points , new cat got it to 350 points over limit.

No tuners ??..77.

retard the timing 22 is way high at idle try 12 or 14 so it will pass but stock is 16 like it says

We ended up putting in a used , stock computer , and also put in a new 0h2. The old oh2 seemed to work fine but wanted that little extra help. Set timing at 10 deg, which made max adv like 26 deg advanced . Passed e test no probs , but car was slower with replacement computor .
Put orig computer back in , power came back and customer is happy. thanks..77.