1987 Turbo 5-speed BPU (exhaust, intake, swaybars)
Basically we bought the supra back from a buddy who has just become fed up with the sheer volume of cash that Christine (The supra) consumes. Basically he had fully rebuilt the engine, rebuilt the turbo head, etc. So then the engine started making a knocking sound and that was it for him and the car had to go.
Bob said the cams were pretty scored up, but not bad enough to warrant replacing the cams.
So here is what it does:
Idle: sounds perfect, no abnormal noise or vibration.
Throttle blipping: A quiet knock that sounds like a rod knock but very very quiet. You can barely hear it over the engines natural sounds
Accelleration: Can not hear the noise. I did not exceed 4000rpm, so I don’t know if the noise comes on past that point.
Underload w/turbo: No noise
Constant throttle @ 2500rpm+: Anywhere past 2500 we get the sound that seems like a rod knock, but it’s rather quiet. The engine is completely smooth. No shuttering or odd vibrations. If say we were to start to go up a hill, held the throttle at the same place it would keep making the noise up until the turbo started to spool up, then it would start to get quieter. As the turbo past into positive manifold pressure the sound went completely away.
Compression braking: no noise
0 throttle, in 5th slowing down: noise was sometimes there, but seemed rather random.
We havn’t pushed the engine hard enough to even know how high the boost will go. We havn’t had it past 5lbs of boost. We did some 1/4throttle to 4k through all 5. It would make the noise during the path to 4K, but only in first.
Temp and Oil pressure were both constant and good. Oil level is completely up and the engine is not consuming oil or water. Pulls very strong and hard with zero hesitation. Fuel consumption is pretty standard… Uses the same amount of fuel it used to when we first owned the car. Fuel is chevron 94 octane.
Not much else comes to mind. Any ideas what it might be?
Thanx
Basically we bought the supra back from a buddy who has just become fed up with the sheer volume of cash that Christine (The supra) consumes. Basically he had fully rebuilt the engine, rebuilt the turbo head, etc. So then the engine started making a knocking sound and that was it for him and the car had to go.
Bob said the cams were pretty scored up, but not bad enough to warrant replacing the cams.
So here is what it does:
Idle: sounds perfect, no abnormal noise or vibration.
Throttle blipping: A quiet knock that sounds like a rod knock but very very quiet. You can barely hear it over the engines natural sounds
Accelleration: Can not hear the noise. I did not exceed 4000rpm, so I don’t know if the noise comes on past that point.
Underload w/turbo: No noise
Constant throttle @ 2500rpm+: Anywhere past 2500 we get the sound that seems like a rod knock, but it’s rather quiet. The engine is completely smooth. No shuttering or odd vibrations. If say we were to start to go up a hill, held the throttle at the same place it would keep making the noise up until the turbo started to spool up, then it would start to get quieter. As the turbo past into positive manifold pressure the sound went completely away.
Compression braking: no noise
0 throttle, in 5th slowing down: noise was sometimes there, but seemed rather random.
We havn’t pushed the engine hard enough to even know how high the boost will go. We havn’t had it past 5lbs of boost. We did some 1/4throttle to 4k through all 5. It would make the noise during the path to 4K, but only in first.
Temp and Oil pressure were both constant and good. Oil level is completely up and the engine is not consuming oil or water. Pulls very strong and hard with zero hesitation. Fuel consumption is pretty standard… Uses the same amount of fuel it used to when we first owned the car. Fuel is chevron 94 octane.
Not much else comes to mind. Any ideas what it might be?
Thanx
