Thread: Fwd T25 Vs. Rwd T25?

I remember on the other forum where it was stated that the RWD T25 was slightly better flowing than the fwd t25's, but I can't seem to find it anymore. Does anyone have any more info on the differences between the FWD and RWD T25's?

Wow no one replied, well your in luck buddy. I believe most RWD T25's are ball bearing and most FWD T25's are journal bearing. In other words, FWD ball bearing T25's are a rare find unless you get lucky and land a W11, but RWD ball bearing T25's are more common since the S15 was a more popular car. Either way for the difference in 2 PSI and a slightly quicker spool it's not even worth going through the trouble...

Thanks for the reply. I was asking because I keep finding RWD t25 pretty cheap around my area.

the rwd t25's are basicly identical to the fwd t25's. The only difference is the turbo outlet pipe and the compressor housing.

All i did when i swapped my buddies t25 with a rwd one was put his fwd compressor housing on and his jpipe on. thats it. There is no better flow from the rwd ones. They have the same size turbine and compressor housings and wheels.

Hope this answers your question. So yes you can buy them cheap and use them as long as you have your own t25 that you can swap housings with.

You still in SOFLA? even FWD T25's are common down there, all them FL boys upgrading to big turbo's you should be able to find a nice setup for cheap, or hit up Andreas Miko or the florida SR20's.com site for help.

i htought the s15 used a t28 not a t25

yes, s13's used t25's, s14's used both t25's and t28's, and s15's used bb t28's

You'll definitely need a fwd wastegate actuator.

you can use both the fwd and rwd actuators i believe they are identical. However there are differences between the t28 actuators and t25 actuators. As well as the turbo oil drain fitting that uses the two 12mm bolts. You can modify the t25 drain tube to fit the t28 pretty easily though. Been there done that being people that sell turbos for some reason even though the new turbo they are getting comes with the stuff like to remove the wastegate actuator, drain tube, and inlet pipe on the turbo. It really pisses me off. When i sell a turbo it comes with everything that it came with.

Also the rwd t25 will have a 2 bolt style inlet for the intake pipe, where the fwd t25 has a barbbed fitting where you can just slide a coupler on and clamp it.

You will most likely have to get a fwd wg actuator, or modify the rwd on if you are using a blue bird or gtir ex. mani.

Some s14's had ball bearing t28's as well most came with the journal bearing version. The s15's had the ball bearing t28.