RB25 turbo part no. ?

[dwhe009]

Hi, im about to go out and buy a RB25DET turbo for my RB20, everyone says to get the series 1 turbo, can someone please verify if the part no. on the housing should be 45V2 or 45V4? I want the steel compressor wheel one ( better, runs higher boost ok)

cheers for help

[BOOSTD]

Forget the numbers, All RB25 turbos have a groove in the compressor snout near the top of the blades. S1 as you said are steel and S2 a composite and black with single blades instead of duel. VG30 turbos have a wastegate outlet pipe mounted on the compressor cover. The trick is to get a VG30Ball Bearing Exhuast housing and bolt it on to a RB25 turbo. Some places have stacks of dead VG30's so can be done for free. It is a direct bolt on however be careful not to angle the housing when removing as the turbine housing as it can snap off the turbine reasonably easily(I know =). The best is to put it in a vice heat it up and it slids straight off. I have personally done this mod on an Rb20 and it made 15rwkw more with the same boost and less detonation. Exhuast note was noticably loader tho.

happy boostin

[dwhe009]

cheers BOOSTD,

Do you mean all i can look at to reconise the series one RB25 turbo is to look into the compressor inlet and see if the wheel is silver, i.e. steel, not black.

[BOOSTD]

Yes to an extent, the R34 turbo's also have a alloy(silver) wheel. VG30 turbo's are almost the same but have a slightly smaller compressor and have the nipple on the compressor housing. If there is any VG30 or RB25 BB turbo's on the shelf that have a larger nut on the compressor grab one of them. The are pretty rare but can handle alot more boost before self destructing as they have a thicker shaft.

[dwhe009]

cheers BOOSTD,

thanks for the help.