So im basically left to my last choice's now ive narrowed it down to the turbo I want, and its going to be:

A. Garrett T3/T40E 57trim 4bolt T31 575$ or 1010$ Ball bearing upgrade.
53LBs/MIN

B. Precision SC3431E 57trim 4bolt T31 800$ or 1080$ for Ball bearing SC3432RE
54LBs/MIN

Man choices is the extra 500$ worth the ball bearing upgrade? i know it spool's faster but I have heard ball bearing turbo's are more reliable with higher boost level's and is a big factor here.

 

Well I look at it this way , the ball bearing centre section will take the shaft speeds and loads that kills bush/plate centre sections . Every time you really lean on a bush cartridge you risk the old style bearings failing and when they do the wheels hit the housings and damage those as well .

Just before the bush wackers rally in defence remember this . A Garrett GT25 BB centre section is compact and light and losely based dimensionally on the GT25 bush centre section . It is difficult to compare them to a mechanically larger T3/small shaft T4 or a GT bush bearing centre section . The GT25BB CS offers better shaft support against radial and end thrust loads but really is a smallish CS . The larger GT BB CS is based around the GT bush Cs and they are a pretty robust bit of gear .

Out of curiosity what sort of power claims do they have for the 57 vs the 50 trim ?
I'm not 100% sure but I think the 50T is a slightly different (later) version of the 76mm T04E compressor family . The only 50T T04E compressor map I've seen looks pretty good and if your driving it with a 76T TB31 turbine I'd think the turbine/compressor match would have to be pretty good if its to have reasonable response and good transients . I've not used those BB TB31/T04E turbos but what I have heard is go the 50T - probably because T04E compressors were originally intended to be driven by larger 74mm T4 turbines .

Thoughts ?

 

The turbines actually a 56mm i believe, I am leaning more towards the precision turbo because that is the exsact one that ETS sell's from their 57trim kit which im basing my peice together kit off of. As far as the T31 exhaust housing, the downpipe i have was made for the 4bolt so i just figured id stick with that same 4bolt design instead of welding a 5bolt exhaust flange on. but they are both i believe based on the T04E design.

On precision websites the 57trim is rated 95 more HP over the 50trim. they are almost identical i believe except the actually turbines used

 

Yes

 

yes ball bearing is way better man buy my manifold to go with the turbo lol

 

Look's like im sticking with the BB design, I have to sell my old stuff before i can get anything new

 

If you have ever seen how long a ball bearing turbo will spin when you shut the motor off, the choice is easy. The difference in spool really isn't that big, it is really how long the turbo stays spooled in between shifts.

When your bangin through the gears, the response is killer.

 

Yeah im def getting ball bearing i think itall be all worth it in the end. stupid of me trying to go journal bearing lol

 

Just a side note, You swapped a nine motor into your 8? Was it just the 9 harness, longblock, and ecu?

 

yes, and i am still using evo 8 tranny/ xfercase