Too much knock w/ stock boost (Datalog included)

[jackstandwarmer]

I'm hoping someone may be able to help me figure out why my car is knocking so much. I bought the car recently because i missed having a decent dsm to daily drive, since my 91 is a pos and has been sitting for a long time. It has 98k on it, seems to have been taken very good care of. I bought it with these mods done to it already, all mods had been installed within the past year.

ported and polished 14b
ported evoIII exhaust manifold
buschur racing 3" downpipe
3" turboback exhaust, no cat, magnaflow muffler w/small non-rice tip
ported 2nd gen TBE
solid upper IC pipe and bigger tbe
MBC @ 10-12psi
stock fuel all the way around


Sorry i wasnt able to log a more complete rpm range, but this should give a pretty good idea. The temps seem pretty high (the car hadnt been running THAT long, and its only like 70 degrees outside), and im definately losing timing advance from all that knock. I know this setup needs more fuel, but i'm running pretty low boost. Any ideas?


Timing coolant o2 TPS RPM Knock air temp
18° 199.6°F 0.96V 75.7% 3188 0 111.2°F
17° 199.6°F 0.96V 76.1% 3313 0 111.2°F
15° 199.6°F 0.96V 76.5% 3438 0 111.2°F
15° 199.6°F 0.96V 78.0% 3656 0 110.3°F
13° 199.6°F 0.96V 81.2% 3813 14 110.3°F
12° 199.6°F 0.96V 82.7% 4000 21 110.3°F
10° 199.6°F 0.96V 86.7% 4219 20 110.3°F
11° 199.6°F 0.96V 92.9% 4406 20 109.4°F
11° 199.6°F 0.96V 100.0% 4594 20 109.4°F
11° 199.6°F 0.96V 100.0% 4781 19 109.4°F
12° 199.6°F 0.96V 100.0% 4969 19 109.4°F
12° 199.6°F 0.94V 100.0% 5125 19 108.5°F
13° 199.6°F 0.94V 100.0% 5281 18 108.5°F
14° 199.6°F 0.94V 100.0% 5406 18 108.5°F
14° 199.6°F 0.94V 100.0% 5563 19 108.5°F
15° 199.6°F 0.94V 100.0% 5625 19 108.5°F
15° 199.6°F 0.94V 100.0% 5844 18 108.5°F
15° 199.6°F 0.94V 100.0% 5938 18 107.6°F
16° 199.6°F 0.94V 100.0% 6063 25 107.6°F
13° 199.6°F 0.94V 100.0% 6219 25 107.6°F
12° 199.6°F 0.94V 100.0% 6281 24 107.6°F
12° 199.6°F 0.94V 100.0% 6344 24 106.7°F
11° 199.6°F 0.92V 100.0% 6531 24 106.7°F
11° 199.6°F 0.92V 100.0% 6594 24 106.7°F
11° 199.6°F 0.92V 100.0% 6750 23 106.7°F
10° 199.6°F 0.92V 100.0% 6781 24 106.7°F
10° 199.6°F 0.92V 100.0% 6781 24 105.8°F
10° 199.6°F 0.92V 70.2% 6938 24 105.8°F
10° 199.6°F 0.70V 11.0% 6406 12 105.8°F


Thanks!

 

[jackstandwarmer]

No help? Or am I just the only one stuck in the retard forum that knows how to use a datalogger?

 

[Littlebeeper]

whats "pretty low boost" ? and if you know that it needs fuel then try adding fuel, assuming you would have the tools to do so from the other DSM you have. then try again with the added fuel

 

[5150DSM]

Stick your hand down the back of the intake manifold, near the bottom in the middle of the bracket is the knock sensor. Feel around in the back of the sensor, if you get brown sticky shit on your fingers, the sensor is done.
I had a similar problem when I bought my car and it turned out that after 12+ years the goop had melted. This made the sensor ultra-sensitive, constantly reading vibration as knock, etc...
Anyways thats the first thing I would look at.

 

[jackstandwarmer]

whats "pretty low boost" ? and if you know that it needs fuel then try adding fuel, assuming you would have the tools to do so from the other DSM you have. then try again with the added fuel

if you'd read the whole post, you'd see where is said between 10-12 psi, when i listed the mods.--

 

[jackstandwarmer]

Stick your hand down the back of the intake manifold, near the bottom in the middle of the bracket is the knock sensor. Feel around in the back of the sensor, if you get brown sticky shit on your fingers, the sensor is done.
I had a similar problem when I bought my car and it turned out that after 12+ years the goop had melted. This made the sensor ultra-sensitive, constantly reading vibration as knock, etc...
Anyways thats the first thing I would look at.

Thank you, i'll check that out, ive got bigger problems with the car now though... check it out..
http://www.dsmtuners.com/forums/showthread.php?p=50415972#post50415972