Bridge Port thoughts
10-26-06, 08:55 AM
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Bridge Port thoughts
So I've been weighing my options on my new motor, and am seriously considering a full bridge. When I began this new project the plan was originally to use an REW with a big street port and a 1.0 AR 62-1. My buddy Chris Ludwig turned me on to this turbo after showing me the dyno graph for a customer's car he built using an S4 13Bt and .96 AR 62-1. I'm using this car as a benchmark.
410whp @ 16psi sounds great, but I failed to pay attention to the spool characteristics and now I'm wondering how happy I'll be with a turbo that's just making noise until past 5-grand. Ignoring the difference between the S4 and S6 motors, I expect it would probably put down similar numbers... Probably a bit more peak HP with a slightly later spool. Since 16-17 psi is probably about the limit on pump gas with the intercooler I have, if I wanted to play dyno-queen and make drastically more power I'd have to run race-gas and/or start playing with water/methanol injection. This isn't something I really want to do...
My last motor was an SP'ed S4 13Bt with a .81 AR T04 that came alive around 4000 rpm. It really fell off noticeably at high rpm and probably topped out around 300hp or so, but I loved how early the power came on.
So it occurs to me that a Bridge Port might be the answer. I expect I'd see quicker spool, and higher peak HP at lower psi. "How much?" is the question I really can't answer. I admit all this is pretty academic but it sounds good in theory, right? We'll see in a month or two, I suppose.
I guess I really don't have a question, just kinda ranting out the debate that's going on inside my head. If anyone out there is running a BP REW with a 62-1 (or any big turbo), and would like to share their numbers I would like very much to hear from you. I'm really fixated on spool and I'd really like to know how fast BP'ed motors spin up a turbo of this size.
Any input is welcome.
410whp @ 16psi sounds great, but I failed to pay attention to the spool characteristics and now I'm wondering how happy I'll be with a turbo that's just making noise until past 5-grand. Ignoring the difference between the S4 and S6 motors, I expect it would probably put down similar numbers... Probably a bit more peak HP with a slightly later spool. Since 16-17 psi is probably about the limit on pump gas with the intercooler I have, if I wanted to play dyno-queen and make drastically more power I'd have to run race-gas and/or start playing with water/methanol injection. This isn't something I really want to do...
My last motor was an SP'ed S4 13Bt with a .81 AR T04 that came alive around 4000 rpm. It really fell off noticeably at high rpm and probably topped out around 300hp or so, but I loved how early the power came on.
So it occurs to me that a Bridge Port might be the answer. I expect I'd see quicker spool, and higher peak HP at lower psi. "How much?" is the question I really can't answer. I admit all this is pretty academic but it sounds good in theory, right? We'll see in a month or two, I suppose.
I guess I really don't have a question, just kinda ranting out the debate that's going on inside my head. If anyone out there is running a BP REW with a 62-1 (or any big turbo), and would like to share their numbers I would like very much to hear from you. I'm really fixated on spool and I'd really like to know how fast BP'ed motors spin up a turbo of this size.
Any input is welcome.
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