crome tuning 450cc help please
 

Guys please I am lost now weeks of research and trying to tune 450cc

motor obd1 zc dohc stock ecu map p29 running on p30 base. car is turbo but trying to get it idle right.

car runs fine with stock 240cc injectors, i replaced it with 450cc dsm blue top with resistor dsm pack.

car runs with crome fuel tools scaling 450new 240old =.533 offset 24. injectors tables set for 450cc 1g.

cant attached map and datalog. but still the car idles at -40% short term fuel trim cant get it to at least -20-+20% ideal should be close to 0%

Re: crome tuning 450cc help please
 

this should be moved to ecu/tuning section

try tuning it in open loop(o2 and O2 heater disabled) as close as you can then enable closed loop it should be very close depending on your tuning skills

just remember not to adjust richer than 14.7 at WOT and high load