so, i made some changes to the car and now (big surprise) it's not running right.

this is on a built 9:1 b18c1, the ignition timing is right on, i am starting with base maps.

the changes were:

new turbo gt3000 - not a factor (still tuning idel)
s300 upgrade from s200
id750 upgrade from dsm 450's
rewired fuel pump with dedicated 10awg line and relay.

i can get the car to run and idel around 800rpm with a a/f around 15, but to do this i have to set the injector size to 300cc. if i set it at 750 like the injectors are the car goes way lean and dies.

also, when i have it running at 300cc, if i give it any throttle the engine stumbels, like it cant keep up with the extra air. if i lightly give it throttle however, it will raise the rpm smothly.

any ideas? i am fairly sure that the dead time is set correctly. i used tonys sheet, and input the values for 43.5 psi.

 

did you remove the resistor box?

 

X2

 

yes. i changed all the injector wiring back to stock.

 

well i got it running better now. idel is at 850rpm, vac is at -20, a/f is right at 15:1, EGT is at 600, and oil is at 20psi. also the throttle response is back to normal.

what i did was increase the low cam fuel table values and corrispondingly raised my injector size value back to 750.

 

still lots of wiring to clean up before i drive it, plus the whole interior is out. also, these injectors dont seem to want to idel well above 15:1, i thought i heard that they did.

 

so i can get it to run good in closed loop, or open loop, but not both. if i am in closed loop and then i select open loop, the car goes way rich. any ideas?

 

What engine management are you using ?
Do you have a stock narrowband o2 sensor installed as well as a wideband ?

 

 

i have the ecu running on the stock o2, and i have a separate wide band o2 for my monitoring. haven't had time for any road testing so there is more to discover.

 

nm, fixed.