engine knocking under boost

Jims-Sy

New member
I finally got my sy back together, put it back to stock. Only things I changed were 1.6 ratio rocker arms, adj fuel pressure reg. 3 bar map, and turbo tweak chip. no cat, Running stock turbo and stock injectors.


As soon as I start to get under boost the ses starts blinking, notifying me of engine knock over 5 degrees. I've bled the intercooler and double checked just about everything and I can't seem to figure out whats causing it.

I checked the waste gate rod when I installed the turbo, and it was right in spec. I have fuel set at 45 psi. Timing set at 0 . My brothers stock ty with a cat feels more powerful. He has a cone air filter but I can't believe it makes that much of a difference. Any help would be appreciated.
 

IGottaSy

Active member
Re: engine knocking under boost

How long have you driven it? I just got mine going and computer needed to relearn fueling. I'd get on it till light started to blink then let off. Drove around for 30 min or so until light quit blinking when I would punch it. I tried taking it thru the whole range of acceleration carefully. Run pretty good now. Is the chip for 93 octane or lower?
 
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