Still cant figure this out! Help Please!

[GSTdude06]

Ok for about 4 months now when I floor my 1997 Eclipse GS-T (14b swap) at high rpms it jerks and goes POP. Ive tried and tried to figure out the problem. Thought it was my boost leak...fixed it and still have the problem...thought it was a bad MBC...bought another one still nothing...finally I bought another 14b wastegate and now when I floor it is jumps to 25+ psi then goes down to around 13 then creeps back to around 18ish. I thought it might be fuel cut but why am I boost 25+ to start then goes to down to just creep back up? My SAFC isnt tuned but I have a logger just no logs yet. Any ideas of the problem???? I just want to boost a safe boost without problems.

Logan

 

[Sivad87]

Ok for about 4 months now when I floor my 1997 Eclipse GS-T (14b swap) at high rpms it jerks and goes POP. Ive tried and tried to figure out the problem. Thought it was my boost leak...fixed it and still have the problem...thought it was a bad MBC...bought another one still nothing...finally I bought another 14b wastegate and now when I floor it is jumps to 25+ psi then goes down to around 13 then creeps back to around 18ish. I thought it might be fuel cut but why am I boost 25+ to start then goes to down to just creep back up? My SAFC isnt tuned but I have a logger just no logs yet. Any ideas of the problem???? I just want to boost a safe boost without problems.

Logan

Boost leak test. make sure that baby is sealed up nice and good. your wasegate could be dirty/damaged or otherwise making it not operate correctly causing the spikes and creep. try hooking the wastegate directly to a boost source and it should run 10 psi. also maybe your BOV is leaking? causing the weird boost issues? might want to check all that out

 

[dave99gst]

if you got a logger - do a 3rd gear pull and post the log here -

 

[BIGBLAZE79]

I suspect a problem with your stock boost controlling solinoid. Try a greddy profec-B its so nice being able to control the boost from the cockpit.

 

[sk8shorty01]

have you done any maitenence on the car lately??? as in do you have sufficient spark and all that??? maybe you are getting enough fuel, just not getting hot enough spark to ignite it all fast enough. The POP you described do you mean a backfire? I would check all the boost components first, make sure there is no leaks, but spark could be another issue.

 

[GSTdude06]

I have maybe 3 month old sprak plugs and wires.... its like goes POP and jeaks...i dont think its like backfire...ill post a log as soon as I can get on the highway byself so more than likly tonight.

 

[GSTdude06]

Calculated load value,Short term fuel trim,Long term fuel trim,Engine RPM,Vehicle speed,Ignition timing advance,Air temperature,Oxygen Sensor 1

20 0 -1, 2544, 56, 32, 75, 840
23 -2 -1, 3096, 56, 17, 75, 920
100 0 -1, 3688, 63, 5, 75, 940
100 0 -1, 4260, 73, 9, 75, 960
100 0 -1, 4804, 83, 10, 75, 600
100 0 0, 5016, 95, 11, 75, 940
100 0 0, 5852, 103, 17, 75, 940
100 0 0, 6240, 110, 14, 77, 740



ok heres the log it was from a 4th gear pull WOT.

 

[GSTdude06]

does that help?

 

[GSTdude06]

please im in great need