HONDA ACCORD CD3 EX
engine: F22B DOHC (Prelude BB5)
ecu: P28 Phearable chip
injectors: obd2 240cc
fuel pump: ACCORD / torneo f18b

if i set on fuel pressure regulator 5.5 kg/cm2 then car is go nice, if i set 3.2 kg/cm2 or install oem fuel pressure regulator then car is slow accelerate

fuel pump? valve clearance? ignition? timing marks? please help

 

not sure what the OP is getting at but sounds like a tuning problem?

 

kg/cm2: 5.5 converts to
psi: 78.1000

kg/cm2: 3.2 converts to
psi: 45.4400

Something is wrong if you need that much fuel pressure to run correctly. You should be setting the fuel pressure regulator at 3.2 kg/cm2 with the vacuum hose off
ecu: P28 Phearable chip <--- this could be your problem.

 

yes i set when vacuum off
if 3.2 kg/cm2 then bad, if 5.5 then fine.

78 psi on 240cc it's 320cc

maybe need chamge injectors?

 

is the car turbocharged? sounds like a tuning issue with the chipped ecu. what happens if you reinstall the stock ecu and set to factory base pressure?

 

isn't charged.
on stock ecu idle is not stable, i try all. no leak. when i add fuel pressure - idle is normal, and car run fine.
when i change ecu on chipped p28 and set the base pressure - idle is bad and car run bad. when i add the pressure car run fine.

 

help