Knock Problems

[DSMnewbi]

Hey guys, first of all let me list my mods...
20G
2.5" TBE w/ atmospheric o2 dump
Buschur Intake
750cc injectors
MAFT
SAFC
Digital Tuning Datalogger
255lph HP pump
Underdrive Crank Pulley
Dejon-Tool FMIC
TurboXS BOV and MBC
SAFC

Ok, so when I go for a drive the car is fine, but when it warms up I knock when I'm in low rpms like when I'm just starting to go from a light. It won't stop until I let off the gas and get back on; giving it more gas does nothing and the knock sum stays up.

 

[las_vegaslazer]

i have the same problem but i have a rebuilt motor so everything is new but my lifters so that is what i think thats my problem so im going to get the new one with biger oil holes in them you mite what to try that

 

[DSMnewbi]

I also have a rebuilt motor, let me know how those lifters go.

 

[ucancallmedebo]

750's are big,and you are fooling the ecu into thinking there is 35%+ less airflow than their really is. Unless you have a chip or dsmlink you are going to be running very high timing across the board...I have problems with timing with 550's on stock ecu and 2g mass which is only fooling the ecu about 20%. This might not be your hole problem,but it would definatly contribute to it. Running to rich will cause knock at low rpm's too.

 

[Cirus_93TSI]

i had the same problem with my 92, problem was a combination of bad tuning and too much timeing, due to my AFC settings being around -25 to compensate for my 650s.
i tuned my fuel on an awd dyno, and the part throttle knock went away. but i havent gotten a chance to adjust the timeing yet, and it still knocks under boost over 8psi, knock increases rapidly with boost (my timeing at idle, which surges from 1100 to 1400 due to a bad ISC and my cams, is between 10 and 20. ouch, way too high).

check your timeing, and/or reset your ecu and re-tune your fuel, or better yet get dyno time.

 

[DSMnewbi]

I've already ordered a PLX wideband o2 and waiting for it to ship.. I'd rather stay away from the dyno to make sure it's tuned right for the street, and so I can part throttle tune also.