knock reading 9 above 15% throttle

[dumbpirate]

this is my first post and i have searched for this for 2 hours now but no one seems to have had this problem. the facts are a 94 talon tsi with a 6 bolt motor, je 9:1 pistons, rc 750 injectors, safc II, big 16g, evo 3 manifold, stock head, new knock sensor, known good ecu, known good fuel pressure, known good secondary ignition. it's a friends car who bought it from another friend who f-d it up. so i pulled the motor and trans, rebuilt the trans, put a new t-belt on it, new gaskets and seals that were installed incorectly, put 750's in it since the evo 3 inj. that were in there were leaking, i ported his turbo elbow, pulled out his a/c that he didn't want, checked bearing clearances and put everything back together. it starts and runs good at anything less than 3500rpm and less than 15% throttle. at anything over those conditionsit seems like it hits fuel cut where it coughs and hesitates and the knock sensor monitor reads 9 only no variation. I used my friends pda with the data logging setup and wired the safc later to verify the signal. it even reads 9 when the knock sensor isn't even connected, and in neutral if you free rev it it's like it hits a rev limit and just coughs black smoke at 5200-5800rpm, i pulled fuel out with safc and it seemed to help a little but still not right. now i'm losing money with it on my lift at work and i just want it to run right for the kid. please anyone help me. i'm running out of hair to pull.

 

[dumbpirate]

i got ahold of some stock injectors and set the safc back to zero correction and it ran fine, injectors were too big.

 

[rjgeier]

750cc injectors are ####ing huge to be using with an AFC, ESPECIALLY on a 16g. Unless you are going to go with an eprom chip or dsmlink, the 750's will be too much to controll with just the AFC. Your ECU will give you too much timing causing the knock. Since you are a 1g, check the timing and make sure it is at 5* BTDC, possibly setting it back a few more degrees, but watch your EGT's when you do this.

^^^do that if you plan on throwing the 750's back in.