i recently remove the turbo from my b18b1, swaped on a jdm b20 cyl. head and swaped injectors with b20 and put a 94 integra ecu in. my car idles rough and does not feel as torquey as it should, but the intake sounds incredibly loud at full throttle. someone told me it was loud because jdm head has bigger intake valves. as far as modification i have a fidanza flywheel, unorthadox pulleys, walbro 255 fuel pump with regulator running 40psi, cold air intake, 4-2-1 header, 3" exhaust with high flow cat into 2.5" turbo muffler. is it idleing poor because of the lightweight flywheel and pulleys? and if so what will explain the loss of power....by the way the timing is corect.

thanks

 

i would start by checking timing

 

what did u use to tune the turbo and are you still using it.a turbo map will make a n/a motor run like crap.

 

i swapped the ecu when i removed the turbo. it is now a stock ecu from a 94 integra. when i had the turbo in i had a chipped ecu

 

did u have any check valves or boost dependent fuel pressure regulator? If u still have those on, that might be your problem