okay here is what i have. a jdm f22b with a h23 port and polish head and a 14b and a fmu on it. i started my car yesterday for the first time since i finished building it and it took a while but it started and had a idle problem but ran good. today i fixed all the vacum leaks and started it and it idled smooth and reved good. but when i pulled it out of the garage and tried to drive it it starts backfiring real bad and has no power at all. does anyone have any ideas?
thanks for the help.

 

is the turbo good ?

 

sounds like a possible lean condition. what are you using for engine management?

 

Get something better than an FMU

 

i wasn't actually getting boost because the turbo wasn't hooked up so it wasn't the managment.

 

just thought of this but what happens it i hooked up the lines on the fmu backwards?

 

You sure you got the fuel system hooked up properly?


Maybe forgot about a vacuum line to the fuel regulator?

 

well if the fmu is backwards what happens or does it affect anything? and what could cause the lean condition?

 

If its backwards, hook it up correctly, then try..

 

Check for a wetness inside dizzy, we had exact same problem with my friends b16 backfired like mad, inside the dizzy was condensation, cleaned it and it was perfect.