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118 Posts
Hi everyone.
After change the timing belt and water pump the car is detting under boost. Not high levels 0,9 bar, even 0,7. I have check all the post about knock and follow all the possible problems. But no way to find the cause.
It’s a GTR33 with not much modificated in the mechanical part. Its 410 Hp 1.1bar (when was possible)
Stock turbos
Power Fc
HKS boost controller VI
ARC intercooler
HKS intakes
Nismo collector
Veilside exhaust
HKS oil cooler
The question is before the belt change it was ok. I have check the belt and all the marks are where should be. Also the AFR (AEM wide band) is like before, 14.5-8 idle, 13.9 to 15.4 moving in normal driving in road and 12-11.5 under boost.
I low the ignition 10 degrees in the CAS and continue the knock (also change the CAS for other).
The fuel pressure is also ok in the gauge. I have try other pressure regulator to high the pressure to see if with more fuel it’s better. Black smoke and the same knock.
In the commander when I log the knock appear a pick suddenly from 10 to 80/90, so I thing is real knock.
I have NGK Racing sparks that I change with the belt. I put again the old sparks and continue the same.
Water temp is always in 81ºC, and intake at 25ºC . I was cheking if something is making sound or touching somewer like I read in other post, but there is not anything unconect or making any sounds in the engine bay that the PFC can consider knock.
I don’t know what more I can check
. Maybe one injector is failing? Can one bad coil produce knock?
Thank for the answers
After change the timing belt and water pump the car is detting under boost. Not high levels 0,9 bar, even 0,7. I have check all the post about knock and follow all the possible problems. But no way to find the cause.
It’s a GTR33 with not much modificated in the mechanical part. Its 410 Hp 1.1bar (when was possible)
Stock turbos
Power Fc
HKS boost controller VI
ARC intercooler
HKS intakes
Nismo collector
Veilside exhaust
HKS oil cooler
The question is before the belt change it was ok. I have check the belt and all the marks are where should be. Also the AFR (AEM wide band) is like before, 14.5-8 idle, 13.9 to 15.4 moving in normal driving in road and 12-11.5 under boost.
I low the ignition 10 degrees in the CAS and continue the knock (also change the CAS for other).
The fuel pressure is also ok in the gauge. I have try other pressure regulator to high the pressure to see if with more fuel it’s better. Black smoke and the same knock.
In the commander when I log the knock appear a pick suddenly from 10 to 80/90, so I thing is real knock.
I have NGK Racing sparks that I change with the belt. I put again the old sparks and continue the same.
Water temp is always in 81ºC, and intake at 25ºC . I was cheking if something is making sound or touching somewer like I read in other post, but there is not anything unconect or making any sounds in the engine bay that the PFC can consider knock.
I don’t know what more I can check
Thank for the answers