Dump valve stopped working couple of weeks ago to find the vaccum joint had seperated. Temp fixed it and cleaned the DV after this everything was ok.
Since then have found that I am getting a high knock reading record on the Apexi commander. Car runs fine and can accelerate without it happening only when I kick the car hard in 3rd or 4th I get a knock spike high up the revs.
Can actually see it happen on the display it doesn't build up or stay high it is just like a spike then it goes.
The car can also gave a high boost reading, mapped by AF to 1.3 with a safety margin of 0.1 to allow a max 1.4 for overboost on track. Highest reading was 1.45.
Talked to Duncan at Hypertech and he suggested the temp fix might be letting the cause. Have renewed the joint and re-clipped it, tested the car at the weekend on a deserted section of road.
Run 1 - ok
Run 2 - ok
Run 3 - Knock reading 65, boost 1.42
Run 4 - Knock reading 81, boost 1.28
Going to take the car the Hypertech once Duncan is back off holidays but just wondered if anyone had any suggestions? Initially thought the DV was a HKS but no markings or codes on it, car was imported and was on it when I got it, have seen a few HKS copies on ebay so think it might to one.