Do your self a favor and dump that Precision turbo and get a true garret w/-12 chra and .63gt 4bolt hausing.Fast spooling and no surging.The Precision turbo's with 5bolt hausings are easy to pkg in a evo w/ac but they dont flow as well as
a true garret with gt 4bolt hausing.

 

If the turbo was purchased from PTE it is a true garrett turbo (CHRA and Compressor Housing), the only difference is the turbine housing they supply is a 5 bolt style. I am not a big fan either but they work pretty well as long as you don't use their .48AR size and use the recommend .63AR and up. I don't see changing the housing over to a 4 bolt fixing the surging problem. If he was running POS .48 housing the package with it to begin with I would recommend the switch to a .63 first but I don't think this is the case. If he was to change turbos I would recommend the -12(520hp) or going to a -13 (600hp) as well.

 

Talked to AMS and found out mine has the bigger compressor wheel w/ seven blade instead of six.
Per precision, the only way to get the correct ported unit on it will be to send the whole turbo to Precision and have a one off custom cover done. That does not really sound very appealling to me, usually means $$$ and I'm looking at about 3wks downtime.
I was hoping to just be able to remove the compressor cover and send it out, that I can do on my own. To remove the whole turbo ? That is certainly something I don't want to tackle myself. AMS charge $400 to do this so it's a job.

The most important point is after all this there's a good chance it still won't work, at least not the way I want it to work which is to be able to do 28+lbs boost.

Maybe I should just go w/ the 50trim, smaller compressor wheel less chance of surging.

Yes this PTE turbo does have the .63 on it

 

This is what I was afraid of, sorry to hear but atleast you have gotten some answers to your question. As for a new turbo why not run a -13 GT30 that flows 60lbs with that 2.3ltr? It is just somthing to take into consideration, regardless both sould get the job done.

 

Did you consider a GT3065 with T3 exhaust housing,GT37R(T67-P trim) or GT35R??

 

If I go w/ another turbo it will be a smaller one for better low end and quicker spool. This is a daily driven car, I log about 25,000 miles/ year and have no plan on going to the track.

GTVEVO, how far are you from KCMO ?

 

Understandable on the smaller turbo choice, you should be able to ring a BB50 trim dry and have a nice broad powerband. I am thinking you would probably make more power on a -12 Surge ported GT30R though on topend, either way you have to pick between 2 very good turbo choices.

I am about 2.5-3 hours south of KC, I actually have some friends from that area but I rarely make it up that way. I am located just a few min West of Springfield MO.

 

The turbine housing is the problem.In many cases there is just to much clearence
around the turbine wheel.Also the fact that the 5bolts have a 2.5"dischage and the Gt4 bolts have a 3"discharge.There is a difference!

 

O Boy, In some cases changing the turbine housing helps but in his case it did not. The GT 4 bolt does have a 3" discharge but only becuase it necks out from 2.5 inches. After you bolt on to a 5 bolt the neck out expansion happens on the O2 housing so it is the same difference. Going to a 4bolt GT housing will not most likley not fix his issue. If the trubine its self was 3" in diameter and he was necking down in the housing yes it would be a problem but this is not the case. Sorry try again.

 

RnR racing is using a new 3076R turbo with .63 A/R instead of the .48 A/R anyone know what turbo it is?

 

RnR only uses garrett turbos.

 

Good luck 600+!
been there done that and im telling you what worked for me.

 

Are you sure you have compressor surge? Sounds to me like you may have blow off valve flutter which can sound very similiar to compressor surge. One big clue is you used to have the .48 and it didn't surge Now you have a 63 and it does. That doesn't make sense. Another clue is you have surge in 2nd gear. If it is comporessor surge to have it in second would be an extremely bad case of it.