Overboost and knock
#1
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Overboost and knock
Hi guys, just driving home from work and when i took a look at my PowerFC's Commander i noticed my knock reading had hit 82! Took it steady for the rest of the drive but i hadnt realy given it any hard acceleration during the drive to be honest. When i pulled up i had a better look and noticed the boost had hit 1.58 which i believe is in BAR. The car was mapped by JGM/Simon to 1.3Bar on the standard 2port boost solenoid in Nov so im guessing the over boost is causing the knock??
I only whent over 4k revs once during the entire journey during an overtake and even then only hit 5.5k max, probably only 5k. I could understand if i had been launching it in 1st and 2nd and redlining that the knock may have been a bit high but this has me worried.
Does anyone know what could be going on?
Details of car are as follows:
97UK Turbo 2000
TD04 16G
Nismo 550cc Injectors
Walbro 250lph
Apexi PowerFC (Mapped by Jolly Green Monster)
Uprated boost pipes.
Any and all help greatly appreciated!
I only whent over 4k revs once during the entire journey during an overtake and even then only hit 5.5k max, probably only 5k. I could understand if i had been launching it in 1st and 2nd and redlining that the knock may have been a bit high but this has me worried.
Does anyone know what could be going on?
Details of car are as follows:
97UK Turbo 2000
TD04 16G
Nismo 550cc Injectors
Walbro 250lph
Apexi PowerFC (Mapped by Jolly Green Monster)
Uprated boost pipes.
Any and all help greatly appreciated!
#2
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check the pipes on the actuator, compressor cover, boost solenoid are all connected and check for splits.
That's a considerable jump in boost I suspect a leak, also worth checking the restrictor pill hasn't got gunge lodged in it also.
Simon
That's a considerable jump in boost I suspect a leak, also worth checking the restrictor pill hasn't got gunge lodged in it also.
Simon
#3
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Thanks Simon ill get under the bonnet tomorrow when i have some light! Engine hasnt blown up at 1.5Bar though so may have to get you back in the summer to up the boost and fit a new solenoid
#4
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Wouldnt have known where to even begin looking if you hadnt suggested it though Simon so once again thank you!
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