1jz vvti ct15b failing? hearing turbo even in vacuum
#1
1jz vvti ct15b failing? hearing turbo even in vacuum
hey guys,
i am pretty sure i didn't use to be able to hear my ct15b so much, especially even around 5-10 inches of vacuum lately as i am accelerating. There is a loud whooshing noise from the turbo as the noise pitch goes along with the turbo spooling up/down. i dont remember my big turbo 240sx having this much intake noise (but then again i had a loud exhaust then, and i'm rocking the stock sc400 exhaust right now).
today i took my intake off today and the compressor wheel looks okay, no in/out shaft play and barely perceptible side to side shaft play.
mye fondling the compressor wheel here:
others here with a ct15b / 1JZvvti, how loud is your turbo? i'm wondering if i am worrying for no reason but neither my wife or i remember hearing the turbo so loudly before..
my second thought is a boost leak but that would have to be a pretty big boost leak and i would think the car would run super rich and not cruise normally. but drivability wise it seems fine.
cheers
Marko
i am pretty sure i didn't use to be able to hear my ct15b so much, especially even around 5-10 inches of vacuum lately as i am accelerating. There is a loud whooshing noise from the turbo as the noise pitch goes along with the turbo spooling up/down. i dont remember my big turbo 240sx having this much intake noise (but then again i had a loud exhaust then, and i'm rocking the stock sc400 exhaust right now).
today i took my intake off today and the compressor wheel looks okay, no in/out shaft play and barely perceptible side to side shaft play.
mye fondling the compressor wheel here:
others here with a ct15b / 1JZvvti, how loud is your turbo? i'm wondering if i am worrying for no reason but neither my wife or i remember hearing the turbo so loudly before..
my second thought is a boost leak but that would have to be a pretty big boost leak and i would think the car would run super rich and not cruise normally. but drivability wise it seems fine.
cheers
Marko
#3
Lots of noise generally indicates something near the turbo is open to outside air. Check your couplers, piping, housing.
Really the easiest thing would be to run a smoke test. Though my money is on the housing failing, it's worth to smoke it first.
Really the easiest thing would be to run a smoke test. Though my money is on the housing failing, it's worth to smoke it first.
#4
i'm going to take the rear housing off to have a peak at the ceramic turbine wheel. i'll also do a boost leak test from the first pressurized coupler out of the turbo onwards..
thanks for the responses! i'll keep you posted. if nothing wierd shows up i will drive it until something breaks
cheers
Marko
thanks for the responses! i'll keep you posted. if nothing wierd shows up i will drive it until something breaks
cheers
Marko
#6
Thanks blk&blu for clarifying that. i checked the turbine and there are no cracks. also stuck a usb camera down the o2 sensor hole and the turbine looks good. i am hoping to find a leak in the couplers somewhere, besides that i have no explanation. will test that next.
a little clip of the camera for ****s and giggles
a little clip of the camera for ****s and giggles
Last edited by estomax; 12-30-14 at 07:35 PM.
#7
well i feel dumb now (right after hooking my air compressor up past the turbo and finding this in a matter of seconds). The lesson to take away is : The 1JZ VVTI motors run GREAT even with a massive hole on the side of the throttle body.
i really didn't think i had a boost leak because it idled and ran fine at low throttles, but my traction control delete had undone itself on one side apparently. Luckily whatever i had bolted on the outside fell out and did not get sucked into the motor. for the record, that 1 cm hole was good for -2psi peak boost that i noticed that i was missing. (13 instead of 15 psi)
Marko
i really didn't think i had a boost leak because it idled and ran fine at low throttles, but my traction control delete had undone itself on one side apparently. Luckily whatever i had bolted on the outside fell out and did not get sucked into the motor. for the record, that 1 cm hole was good for -2psi peak boost that i noticed that i was missing. (13 instead of 15 psi)
Marko
Last edited by estomax; 12-31-14 at 07:31 AM.
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