differences in the s15 turbos

[Tdiazsch]

need to know, thanks =]

also whats the efficiency range on the 28?

[vocationalzero]

The S15's only came with one turbo, there was never a change while the car was in production. However it was only produced from 99-02 I believe which doesn't leave much time for factory production mods.

[Tdiazsch]

ok cool thanks, i just heard in the vine about something that they had 2 different ones but i really wasnt to sure. nothing to wrong with asking, thanks!

[zach-Ka]

Well I know that the 300zx ran the T28 also. Idk if there are any differences between the two...

[DuckyD]

I believe the 300ZX ran dual T25s. But I am not certain.

[mRodiek]

According to Garrett it is filed as the GT2560R, but Nissan still refers to it as a T28.

[homeslicej2]

I think the OP is refering to the supposed differences between the Spec-S and Spec-R S15 turbos. From FRsport.comThe Difference between this turbo and the S15 Spec S Turbo (Nisan_14411-69F00/Garrett_466541-5001) is the Hi Nickel "NiResist" turbine housing and inconel blade materials for extreme heat resistance. One can expect to push a few more horsepower out of this turbo than the Spec S version. I can't remember, but IIRC, 17.5 PSI is the efficiency limit on the Spec-R S15 turbo.

[PantherRacer]

That is TOTALLY wrong... As S15 Silvia's go the Spec-S is the non turbo version & the Spec-R is turbo. I don't know where the hell they're getting their information from. That needs to be revised.

I think the op means to ask about the difference between the blacktop T28's as there is a difference between the S14 T28, and the S15 T28, The S15 being a bit stronger.

"The third generation(S15) received a more refined T-28 turbo. The compressor was the same BCI-1 wheel put inside a T04B housing, but the turbine received an upgraded inconel wheel and had a cast divider wall in the wastegate discharge path to help aid spool characteristics."zerothread/306956

Edit: I sent them a nice email, so hopefully they fix it
Modified by PantherRacer at 12:21 AM 2/19/2010

[homeslicej2]

^huh...well, let us know what they have to say about it.

[PantherRacer]

This is what they had to say

"Hi Anthon, it appears you are right. Whoever wrote that description didn't know about the Spec S. For clarification, the 14411-69F00 was used in S15 model as well. It was used in models that had an Auto 4 Speed transmission. It is also the same turbo as the MT/AT S14 Silvia K's since J's and Q's were non-turbo.

Regards,

Vu"

Well, that further clears things up like he said. The S14 T28 was carried onto the automatic S15 Spec-R's. I guess Nissan had a few left over? Would suck if you were dealing with an importer who doesn't know if the car was A/T or M/T intriguing...

[homeslicej2]

Good info. Now that I think about it, I believe I've heard before that the auto S15's had a different turbo. Seems, as you and Vu stated, that they were leftovers from the S14's. Thanks.