Major Boost Problem

[travislaw]

I need some ideas and some major help. I have already spent $700 trying to figure out my problem. This is for a 96 Eclipse GS-T by the way. My problem is this:

About a month ago I started having a big boost problem. As soon as my car hits 4,000 RPMS the boost gauge is showing I have hit full boost and then the car accelerates really crappy. I took it to the dealership, they made me buy orginal 2nd Gen BOV and restore my BOV piping. I had a custom 2.25 inch metal pipe going from the intercooler to the BOV with a 1st gen BOV set-up on the car. So I spent $200 restoring the car back to stock. It cost me $380 for the diagnostic and they told me to replace my fuel pump. SO I replaced it with a 255 LPH fuel pump. The whine from my pump is gone (finally). I am still having the same problem, but car isn't running as crappy. It's like going from Eclipse Boost Accelaration to Geo Metro acceleration as soon as I hit 4,000 RPMS. I had another turbo and swapped out my waste gate actuator and still have the problem. I think I am hearing a lot of air going through the exhaust as soon as I hit the 4,000 RPMS. What could be causing my problem still? I have done a boost leak test and don't have any. I have also checked the vacuum hoses and they appear fine. Any other ideas? Do I need a bigger waste gate actuator? I miss being able to boost all the way to 6,500 RPMS. Please help!!!!!

 

[travislaw]

Thanks, that's what I was getting at.

I am in complete agreement with oldman on this one, but if you find it necessary to keep throwing parts at the car, be my guest.

I, on the other hand, would rather spend an hour or two in the driveway trying to diagnose/fix the problem myself.

If I do get teh NGK BPR7ES plugs, what should the gap be set to?

 

[oldman]

If I do get teh NGK BPR7ES plugs, what should the gap be set to?

Considering you're pretty much stock, go with BPR6ES gapped at .028".

 

[travislaw]

Considering you're pretty much stock, go with BPR6ES gapped at .028".

What should my gap be set at when I install the Big 16g Ported Evo III turbo?

 

[oldman]

What should my gap be set at when I install the Big 16g Ported Evo III turbo?

.028", your boost level will still be limited to 15-16psi with the EVO3 due to the stock injectors so stick with BPR6ES. Once your fuel system is upgraded to support higher boost levels, you can then switch to BPR7ES still gapped at .028".

 

[travislaw]

Well it was the turbo that was causing the problem. I had oil in my intake system, so I did blow a seal. I replaced my turbo this weekend and put in my FPR. It is running awesome. There are no problems whatsoever. I'm glad the dealership was correct for once.