Hey everyone,
Im going to take my car to a qualified mechanic for a full diagnosis, but i thought id ask you guys first so I have an idea of what cost i have coming my way.
Ive just imported an R32 GTS-T 4 door, and when I use about 3/4 throttle at above about 4500-5000 rpm, there is a big power loss and the exhaust makes the same rumbling that happens when the engine is on the overrun after lifting off at mid-high rpm. The power loss seems to come it at the same time as the (factory) boost guage reaches its maximum. It seems to happen most when the air is cold. On a hot day i could drive very hard without any such problems. I havent used full throttle in these conditions so i dont know whether it clears up with more throttle (aftraid of killing car).
The other symptom is that the fuel pump is very noisy, and can be heard over the 3.5 inch HKS exhaust up to about 1/3 throttle. Im not sure whether its a noisy aftermarket fuel pump, or whether the current fuel pump is dying.
Do these symptoms sound like a faulty fuel pump causing fuel starvation? I was thinking the fuel may become more viscous or something in the cold which is why the symptoms arrise... or the fuel pump may be less efficient when cold... Anyways, Im not very good mechanically, so I'd appreciate the feedback.
If it is the fuel pump, what's the bill coming my way? Is it worth upgrading to a larger fuel pump now if I want to increase boost some time in the future? WOuld a used RB26DETT fuel pump be best?
Thanks in advance for any replies!