violacleff Posted March 26, 2006 Share Posted March 26, 2006 Ok so I'm going to be running the the TS04 that I've been using on my L on my RB25. Now i'm not sure of the spool differences in an RB and an L31T. I was running 8.5:1 compression on the L with a nicely ported head, and was very happy with the boost response. I guess I'm not sure if the flow will change with a .58 T4 or if it would be quite similar since the T3 housing was ported for a P-trim. The RB25 has 9.0:1 compression and crossflow head. Any suggestions? BTW I'm going to be running an SS autochrome manifold. I believe in can be had in T4 or T3 flange so that won't be a big deal. Quote Link to comment Share on other sites More sharing options...
Clifton Posted March 27, 2006 Share Posted March 27, 2006 I'd go with the .58 T4. The hole in a T3 .63 is pretty small. The RB would spool a little slower with less displacement. You'd make it up, up top though. Quote Link to comment Share on other sites More sharing options...
violacleff Posted March 27, 2006 Author Share Posted March 27, 2006 Does it make any difference that its been ported to p-trim? Quote Link to comment Share on other sites More sharing options...
Clifton Posted March 27, 2006 Share Posted March 27, 2006 The only part that would of been machined would be for the turbine wheel to fit. The a/r would still be the same. I have a .70 for an O and P trim. The inlets on the housings are identical, only the trim differs. Quote Link to comment Share on other sites More sharing options...
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