I am mostlikely going to be buying one of these over the winter for my STE as I have pretty much given up on this old worn out T25. However, I am wondering which turbine housing size I should get. There is .64 or .86 ar, but I'm not sure how much difference there is going to be between them. I am only looking to make right around 300-320 crank horsepower, and I would like the turbo to spool as quick as possible, so I'm thinking the smaller .64 would be better, but would it hold 12psi at 6500rpm? I'm thinking it shouldn't have any problem with that, but I want your opinions on this. Would I be better off with the .64 or .86 for what I want. I drive the car everyday, so I would like it to still have a good spool up time, because turbo lag isn't good for driveability, but I also don't want it to fall on its face on the topend.
Thanks,
Shawn
I don't honestly believe that you will have any spool problems w/ the .86 a/r. I mean hell, the people designing them are still saying it has good spool on a damn 2.2 liter. Were a full liter over that. I have been looking and I'll probably be going w/ an even bigger turbo, but keeping the flange.
Jay,
your going to a T-3?
Quote from: god910I don't honestly believe that you will have any spool problems w/ the .86 a/r. I mean hell, the people designing them are still saying it has good spool on a damn 2.2 liter. Were a full liter over that. I have been looking and I'll probably be going w/ an even bigger turbo, but keeping the flange.
I'm sure even with the big housing it would spool quick. However, I am used to my basically non-existant turbo lag with my T25, before I did my topend swap that thing would be fully spooled by 2k. Obviously this turbo probably won't spool that quick, or maybe it will, however, I guess what I really want to know is what the difference between the .64 and .86 housing is going to be in spool up time, and how much difference is it going to make in high rpm boost? Is the difference in spool up time even going to be noticable between the two?
Thanks,
Shawn
There probably isn't going to be any difference being that the GT28RS is a dual ball-bearing turbo. Ball-bearing turbos tend to spool faster than their convential thrust bearing counterparts. I would definitely go with the .86 as the stock turbine housing is much too small.
.86 it is then. Probably won't be until nearly spring, but I wanted to know what I need to get. Thanks for the advice.
Would it be beneficial at all to step up to the GT2871R instead of the GT28RS if I'm not planning on making more than about 320hp? I'm thinking not, but I'm just wondering because the price difference is only a few dollars.
Shawn
Quote from: god910I don't honestly believe that you will have any spool problems w/ the .86 a/r. I mean hell, the people designing them are still saying it has good spool on a damn 2.2 liter. Were a full liter over that. I have been looking and I'll probably be going w/ an even bigger turbo, but keeping the flange.
Yes the engine is 1 liter bigger than a 2.2 liter, but look at the facts. The 3.1 has less cubic inch per cylinder so technically the 2.2 would have a better response. Sorry to disapoint
We have too much exhaust trying to make it's way out, therefore anyway you look at it, 3.1L has more volume than a 2.2L In this case more exhaust volume.
Quote from: Gearhead43Jay,
your going to a T-3?
On TestBed, it's staying a T2, but yes, unless something changes I'm leaning more toward the 2871RS. Now on Sunshine, that's a different story. No need to backup the near non-existing 5 speed market. That one's all about fast. On TestBed, I want to make upgrades that most anyone could do in there garage. So, no custom pipes, or mounting. I've got alot planned in that department, so time will tell.