t28 ballbearing guys

[toledo240]

Alright this winter i plan on maybe getting around to a bigger turbo. the t28 is the one i want.whats better for the bargain and whats the best choice.s14 t28bbs15 t28bbpulsar gti-rt28

I hear you gus putting these in but which one do you get. And im a definite lowballer so money is an issue.

[180fan]

s14 if money's an issue.

[nismostate]

could of sworn that s14 t28 wasn't BB

[quiksilvia]

i belive most of them are, or all of them, but i know that some are at least

[Cyberkreig]

I *think*, *THINK* that the s14 t28 is single bb as opposed to the s15s dual bb.

Thats the hearsay anyway.

[SRdave240]

The GTiR flows the most 33lbs/minThat is what I am putting in.

[Onizuka]

Brand new S15 or GTiR is the best choice.Used S14 T28 is the most economical.

I seriously doubt the GTiR turbo is as bolt on as the S14 and S15 turbos though.

[SRdave240]

you are right, it isn't a direct bolt on but its pretty simple nonetheless. The turbo needs to be reclocked, the inlet needs to be cut and rewelded, and the lines need to be rebent (or just use stainless braided ones)

BTW - the GTiR is NOT bb

[Cyberkreig]

Well, What is the flow difference? I'd imagine if its not bb its going to be much less expensive though.

I seem to remember 31lbs/min from an s15t28 but I'm going to have to look it up.

[toledo240]

so my mind is set to a s15 or s14 bb. i want that fast spool up, with these turbos would i go with 550's or am i ok with 480's?and z32 mafs and of course safc. the t28 is 31lbs/min single bearingand the gt28 the "disc potato" is dual bearing and is 35lbs/min which one of these are from the s15???also im i ok with going with 480's injectors or should i go with 550's to be more effiecient?

[Onizuka]

The S15 is dual ball bearing. The GT28 is a good way to blow an extra $700 when a S15 turbo is basically the same thing. 480's should do you fine.

[SRdave240]

The GTiR flows 33lbs/min. BB does not make your turbo spool up at a lower RPM. But it helps quite a bit with transient response - i.e. if you are off throtle at 5k rpm and then floor it, the bb turbo will spool up quite a bit faster than the non-bb one..

[SoCalS14]

I believe the S15 has ceramic wheels as well...

[Nismo_Freak]

There are about 4-5 different turbos that were put onto the S14 and S15's between the different years and models.

Not all of them are ball bearing.

[Onizuka]

Which is why I suggest just getting a new one from phase2 or others. Its guarenteed to be dual ball bearing, and its hard to beat $850 for the performance compared with other new turbos.

[toledo240]

Alright so the s15 ballbearing turbo is that much more efficient that the s14 ballbearing? does it have faster spool, or is it just more reliable? lets say if i ran 14-16 psi daily is it that big of a difference between the two?

[creophus]

Alright so the s15 ballbearing turbo is that much more efficient that the s14 ballbearing? does it have faster spool, or is it just more reliable? lets say if i ran 14-16 psi daily is it that big of a difference between the two?

I am by no means an authority on this...but...I have heard from someone who I think is an authority. The dual ball bearing turbo in the S14/S15 is supposed to spool faster and handle higher boost on a regular basis.

I wouldn't recommmend running that much boost daily though. You might get yourself into trouble.

[Doomed2Walk]

S15 T28 is dual bb w/inconel turbine which acts as a heat absorber also, so it is good up to like 350HP, while the S14 is single bb with a T25 turbine which is good up to like 310HP or so. I do believe the S14 turbos are all the same (I mean the notch-top engines, not the blacktop) or at least the ones imported are the same. I think same with the S15s too, because people usually only import the Spec-R clips/motorsets.

Oh, for the turbo info go to http://www.srswap.com (heavy throttle's site) and look at the JDM engine something or other info and it will tell you.

[MainEvent212]

GT28 is nto the whole name of the turbo

the disco potato is the GT28RS

the GT28R i believe is nearly a direct match to the S15 T28 bb