Originally Posted by james12345pt
You are experiencing severe back pressure on the hot side of the turbo due to the inlet pipe and ar housing. The wastegate is having a difficult time maintaining a constant level due to the high pressure being placed on it. Also, You are just blowing hot air past ~16 lbs boost with that setup. Yoyu could try an open wastegate dump to quickly remove some of the air going through the turbo and/or a larger 1.06 ar housing to allow a little more flow through the turbo. These changes will net you some more power but will not get you to 600whp. The 6266 will make more power but it will be a small step up and may or may not get you to 600whp without having to use racegas or e85. If you use an alternative fuel source you will hit 600whp with the gt35r turbo with the 1.06 ar housing. the gt35r on a dynojet with the .82 housing may get you to very low 500 range, the 1.06 housing will get you to 525-550, the 1.06 housing with race gas or e85 will net you 0ver 600whp. A couple of guys state that they achievd 600whp with the 6266 ,on pump gas,with the vband housing but I have not seen a dyno yet.
Excellent info thanks. I did find another guy having the same problem as me, and there was talk about going to the 1.06 housing in that thread also, or moving to a T4 housing.
I do have open dump wastegate. I did this same time I installed the EBC, and the tune after those installs did get me another 20ish peak which is where I'm at currently. I wasn't sure if this was due to the EBC smoothing out the boost, different atmospheric conditions, or just a fluke.
So next question, would running a 6266 T3 .82 have the same problem? I'm familiar with what everything means, just not familiar with how each one effects response and flow.
GT35 T3 1.06 4 bolt
GT35 T4 .63, .82, 1.06 vband
6266 T3 .82 4 bolt
6266 T3 .82 vband
6266 T4 .58, .68, .81, or .96 vband
If I can get 550 on pump gas I'll be happy, and then can run separate maps for race gas for the days I want to have more fun. I also am looking into Haltech with flex for next year and have the option to run E85. Only problem is E85 has limited availability here and I do take longer trips with this car, so I'd like the ability to run pump. I'd like to not run the turbo at its limits on pump though.