Poor running on high boost

[Monty Carlo]

Hi,

Today I have fitted an uprated fuel pump and pressure regulator to my ep91.I roadtested the car and all was ok.Next I fitted a HKS fcd but when I roadtested it the car would judder and cut out when ever I dipped the clutch and let off the accelerator,also the engine management light would flash on and off.I went back and checked all my connections which were ok.Next time I tried it with the low boost setting switched on and the car drove perfectley.It just wont run properly in high boost mode.This is made even more puzzling because the hi-low adjustment has been disabled since I have owned the car.The light on the dash comes on but it runs 0.7 bar boost whether on or off.If anyone can offer any help I would appreciate it

Cheers

John

[ecksjay]

Hi,

Today I have fitted an uprated fuel pump and pressure regulator to my ep91.I roadtested the car and all was ok.Next I fitted a HKS fcd but when I roadtested it the car would judder and cut out when ever I dipped the clutch and let off the accelerator,also the engine management light would flash on and off.I went back and checked all my connections which were ok.Next time I tried it with the low boost setting switched on and the car drove perfectley.It just wont run properly in high boost mode.This is made even more puzzling because the hi-low adjustment has been disabled since I have owned the car.The light on the dash comes on but it runs 0.7 bar boost whether on or off.If anyone can offer any help I would appreciate it

Cheers

John

Firstly, who's setting up the RRFPR and FCD?

If you dont know what you're doing, then it has to go on a dyno with wideband and someone who knows what they're doing to set it all up correctly.

also, show us a pic of the engine bay, we can see if the OEM boost control solenoid is there.

[montanajr]

Quick question here; could I not setup a fpr myself? I.e. buy an AFR gauge, then take it out for a drive, adjust as necessary, then repeat. Its crude, but I was just curious as that could be the route I eventually take.

[Glanza_Ragger]

You have to remember, the afr wont seriously change all the time the stock ecu is fitted.

And afr is not the only thing to keep an eye on, that could be spot on but if the egt is too high, thats also a quick way to say rip fte

[Gilly]

an EGT would be a good buy, which number is your FCD on? I've i can remember it was about 7 or 8 for starlets.