hi guys, i've been having problems with my stock B18c1 with t3/t4(6psi). Couple nights ago, i noticed a rattling noise coming from my engine bay only when i hit boost. i first thought something was loose, but quickly realized it might be detonating. So i checked the plugs, played with ignition timing and fuel pressure, but still making that rattling noise. The spark plugs (ngk bkr7e11)had no specks of aluminum, just whiteish brown color. The fuel pressure is at 45psi idle, and is connected to the vortech FMU(dont know what disk...the black one?)... i also thought the compressor wheel might be hitting the housing, but i just had the turbo rebuilt at turbo city in Orange, Ca last year. But i will check the play tomorrow.. anyone have any suggestions for me? any replies are greatly appreciated.

 

why do you have a fpr and fmu?

 

PFR is good for idle purposes.. i dont kno why people ask that...but i dont kno why people have it on stack injectors.. the only reason i see to use it is on bigger injectors.. but i might kno what the problems is if it sounds like a buzzing rattling sound then it might be your turbo about to fall off your manifold.. i got that noise rite b4 my turbo fell off the manifold its the sound of the gasket buzzing inbetween just my point of view

 

thanx for the input guys,, the reason why i have a fpr with the fmu is because i have the b&m fpr since i was all motor, and i havent put on the stock fpr because i had to cut the stock fpr... I guess it doesnt matter right? because i have the FMU on there? Im going to check to see if all the bolts are tight under there tomorrow romeo619, thanx

Also, could the vacuum lines be incorrect? i have a vacuum line from the wastegate to the turbo compressor housing nipple, and the other vacuum lines are tee'd off from the intake manifold/bov/fpr?

 

im kinda curious here also........ive noticed a slights rattling as I enter full boost. Only seems to happen in like 1st and 2nd and for a second then dieson me. Ive been hoping for a loose bolt or something just so I could pin point the problem but haven't had any luck figuring it out yet.

 

BOV? Maybe?

 

i checked the problem tonight. it was the turbo. the turbo shaft has lots of 'play'... i guess its time for me to get a new turbo. kinda glad it wasnt detonation. tahnx for your input everyone