weird bogging problem, check out my logs

[Sephroth57]

attached is a gif of my log, i just logged myself driving home from my friends house and when i got on open roads i floored it to get some WOT readings, i know its best to get a 3rd gear pull but i couldnt do that in this area. anyway sometimes when i go WOT and start boosting the car will bog down around 12-14PSI and get really slow, then if i keep flooring it it will eventually stop bogging and go again. my timing gets pulled a lot i dont know what the deal is. anyone have any idea by lookin at this? i can upload the actual log file if it would help you to view it in the PLviewer prog. let me know

 

[Sephroth57]

eh that pic came out horrible, if anyone can help me give me your email ill email you the file, tuners wont let me post a full size picture

 

[CanadianTSi]

Could be a boost leak.

 

[Maglin]

Man it almost seems like you are getting some serious knock at boost onset. What does your O2 reading look like when it's bogging???

 

[Sephroth57]

<p>
time RPM Timing 02 02 trim

32.56 |908.0 |14.0 |0.0 |0.78
33.22 |1928.0 |16.0 |0.48 |0.0
33.89 |3156.0 |5.0 |0.08 |1.56
34.56 |3536.0 |29.0 |0.86 |0.0
35.22 |3840.0 |14.0 |0.94 |0.0
35.88 |4228.0 |10.0 |0.98 |0.0
36.54 |4792.0 |8.0 |1.0 |0.0
37.2 |5308.0 |9.0 |0.98 |0.0
37.86 |5816.0 |14.0 |0.98 |0.0
38.53 |6344.0 |19.0 |0.98 |0.0
39.18 |6796.0 |21.0 |0.98 |0.0
</P>


here maybe this will help, my timing curve is going up normally as i floor it and RPMS go up , then all of a sudden it starts massively bogging around 3100 RPMS and then kicks back up to 29 timing, and its just all weird...


now there is a weird hissing noise coming from my intake manifold when it just idles u can hear it hissing, the sound sounds like its coming from inside. i heard my friends 2g idle his kinda makes the noise too its just the air passing through inside but mine is louder, is it possible the intake manny could be messed up inside?? theres nothing to it though its pretty much just piping... so i dunno. i tried leak testing and it makes the same noise but u cant really feel air coming out like it was leaking, i suspected the gasket to be leaking but now im thinkin its something else

any help would be appreciated

 

[Mackzero]

When I have been out recently tuning my 90 GSX I have noticed that I have to have my O2s down around .80 or it will run to rich and make a hesitate/bogg mid way through the rpms around 5K or so. I believe the O2s on my car generally read .1 lower than yours would. Maybe you are running a little rich and the ecu is seeing it and adjusting for it?? Just a thought, sure seems like what mine is doing.

 

[Sephroth57]

i dropped my fuel a couple % across the board on my AFC and it is running much better, i guess i was bogging down from running too rich, weird cause i havent touched it in a while but whatever. i havent had a chance to log with the new settings i will post again once i do, what is the ideal O2 reading for a 2g?

 

[Strm Trpr]

I did a boost leak test to 20psi and found a hissing coming from in and around my intake manifold.
Turned out to be boost leaking around my injector seals....