PTVDesign

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

jesus_ralliart

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

2k.civic.si

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.

PTVDesign

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?

dpetro1

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?

PTVDesign

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.

PTVDesign

help