Ben98SentraSE said:
I know this is the RWD forum, but any ideas which of these three GT turbos will fit (i.e. clear block and all other hard objects) with a Bluebird manifold? A GTi-R manifold?
I believe there is not much that will fit on a BB manifold. I think the 3037 will clear the block with a gtir mailfold if the flange is milled at an angle and holes drilled out. Wastegate is still a small issue.
There is a little confusion about the 3037. HKS 3037 is not equal to GT30 - series turbos. The HKS 3037 is a garrett-based turbo, but is HKS-proprietary. meaning, you can't get the exact turbine/compressor from anywhere else. It seems that you can get something very similar from elsewhere. the 3037 has a t25 flange.
a turbo rob told me should perform similarly but should be easier to come by (Garrett turbo. I think Incon can source) is the GT30(r?). I'm not positive which flange it uses (t3 or t25) but its a full ballbearing turbo like the 3037 . 76.2mm 52/56 trim compressor, 60mm 84 trim .82 A/R turbine. These turbine specs are awfully similar to those of the 3037, the only difference is the A/R, which makes me think its the same t25 housing. (not positive). The compressor specs are identical, except the 3037 uses a (newer, i think) wheel with different aerodynamics.
The GT28(r?) series turbos are supposed to be good in some configurations. this is similar/same as the GT2835 and uses a t25 flange. (cut GT30 wheel in a t25 turbine housing). the horsepower cieling on this one might be a bit lower. (350-400)
GT25-based turbos (hks 2540, gt25r) are big turds according to rob.
for more moderate street power, the disco-potato B15 SEMA car's turbo is supposedly the hot ticket, but is not available to the public yet; and i believe will bolt to the gtir manifold. its sortof similar to Ray's turbo ; a t28 with a to4b compressor housing.
There is also a rumor circulating occasionally that Garrett's ballistics-series turbos (all the GT30, GT28, etc. stuff) are being discontinued. this rumor is apparently untrue.
Disclaimer: im not an expert at this, i'm just passing along what i've learned. YMMV IMHO, etc...
Andris