Rotary Car Club - View Single Post - Twin Charged FD

RX SE7EN · 03-15-2011, 09:55 AM

Hey Everyone,

The purpose of the build is to twin charge my FD. Yes, I said twin charge. I’ve been researching for about a year now, this type of thing isn’t very well documented anywhere (well from what I’ve seen anyways). So I’ve been slowly designing the system and collecting parts. My goal is to have it working by deals gap, not sure if it’ll be done, but that’s the goal. Before I get started, I’ll just say that I know that these kinds of threads come along and then nothing ever happens, and that could very well end up being the case here, but I’m going to give it a shot and see what happens. I welcome all constructive ideas, but please refrain from posting negative criticism (I’ve made up my mind to try this, no turning back now)

I’ve currently got the Greddy T78 kit. When I had it tuned, it made 454whp at 18psi. Which is a little low, and the previous owner blew an engine on the car so I think it has seen better days. I’ll be sending it off for a rebuild in sometime this month, so even if this project doesn't work, I'll at least gain a fresh turbo.

I bought a remanufactured Eaton M62 supercharger in September. It’s got a clutched pulley and I plan to have it disengage after its done doing its work down low (1k – 6k rpm), then the turbo will take over entirely. I’m aiming for around 500whp somewhere around 20psi (with meth injection). But with torque down low, and no lag. If this actually works, I’ll upgrade to a larger turbo to make more top end power with no lag.

I’ve been debating going 20b, and would if the car wasn’t already single turbo and using the TEC GT ecu. Going 20b would require changing out the ecu, buying a 20b, buying a mounting kit, and paying someone to make new piping for me. Those are the big costs that I would incur; I know there are many other small items that would add to it. So the next best thing is attempting to grow my hp level, but decrease lag and increase torque down low. That’s where the twin charged setup comes in. And if it works, I can then transfer it to a 20b application a few years from now, which would be the ultimate setup.

I've come across a bunch of videos on youtube during my research:
Coolest silvia I’ve ever seen:
http://www.youtube.com/watch?v=4SjNgVH_HN0

And my true inspiration: go to 1:60, it’s instant boost (I know there is no load on the engine, but still cool)
http://www.youtube.com/watch?v=wLB2P1ziXYA

I’ve found numerous threads on twin charging, on many different forums, but never really anything that shows start to finish, with a DIY. And definitely nothing on this forum. A lot of the info I found was geared more towards big V8's with short rpm ranges with a supercharger on top of the engine and turbochargers compounding through the supercharger, with both systems on all the time, so those don't really help me that much (wouldn't be great on the FD). But I was able to find a picture of what could possibly be the best FD setup ever: (couldn’t find pictures at completion or information on how it was controlled)

03-15-2011, 09:55 AM	#1
RX SE7EN Rotary Fanatic Join Date: Feb 2010 Posts: 183 Rep Power: 16	Twin Charged FD - Fraternal Twins Hey Everyone, The purpose of the build is to twin charge my FD. Yes, I said twin charge. I’ve been researching for about a year now, this type of thing isn’t very well documented anywhere (well from what I’ve seen anyways). So I’ve been slowly designing the system and collecting parts. My goal is to have it working by deals gap, not sure if it’ll be done, but that’s the goal. Before I get started, I’ll just say that I know that these kinds of threads come along and then nothing ever happens, and that could very well end up being the case here, but I’m going to give it a shot and see what happens. I welcome all constructive ideas, but please refrain from posting negative criticism (I’ve made up my mind to try this, no turning back now) I’ve currently got the Greddy T78 kit. When I had it tuned, it made 454whp at 18psi. Which is a little low, and the previous owner blew an engine on the car so I think it has seen better days. I’ll be sending it off for a rebuild in sometime this month, so even if this project doesn't work, I'll at least gain a fresh turbo. I bought a remanufactured Eaton M62 supercharger in September. It’s got a clutched pulley and I plan to have it disengage after its done doing its work down low (1k – 6k rpm), then the turbo will take over entirely. I’m aiming for around 500whp somewhere around 20psi (with meth injection). But with torque down low, and no lag. If this actually works, I’ll upgrade to a larger turbo to make more top end power with no lag. I’ve been debating going 20b, and would if the car wasn’t already single turbo and using the TEC GT ecu. Going 20b would require changing out the ecu, buying a 20b, buying a mounting kit, and paying someone to make new piping for me. Those are the big costs that I would incur; I know there are many other small items that would add to it. So the next best thing is attempting to grow my hp level, but decrease lag and increase torque down low. That’s where the twin charged setup comes in. And if it works, I can then transfer it to a 20b application a few years from now, which would be the ultimate setup. I've come across a bunch of videos on youtube during my research: Coolest silvia I’ve ever seen: http://www.youtube.com/watch?v=4SjNgVH_HN0 And my true inspiration: go to 1:60, it’s instant boost (I know there is no load on the engine, but still cool) http://www.youtube.com/watch?v=wLB2P1ziXYA I’ve found numerous threads on twin charging, on many different forums, but never really anything that shows start to finish, with a DIY. And definitely nothing on this forum. A lot of the info I found was geared more towards big V8's with short rpm ranges with a supercharger on top of the engine and turbochargers compounding through the supercharger, with both systems on all the time, so those don't really help me that much (wouldn't be great on the FD). But I was able to find a picture of what could possibly be the best FD setup ever: (couldn’t find pictures at completion or information on how it was controlled) Last edited by RX SE7EN; 03-15-2011 at 10:17 AM.