Planning my turbo set up, input/ideas welcome.
10-02-2014, 09:16 PM
#1
Planning my turbo set up, input/ideas welcome. I have bought most of my expensive parts and am going through the planing stage of install.
Parts are:
PT6768's
Dual Bell 4 1/2" x 16" x 10" cores
PW46 Waste Gates
XSPower 50mm BOV
E-boost 2 controller
Motor is currently a 13-1cr 418, but that will be changing when I go to a 6 bolt block. Adding a few cubes as bore will be a 4.1" but compression will be coming down with the new piston.
I have a lot of room in the back of my truck. The current thought is to do a mid mount turbo set up with a dual air to water intercooler. I would hang the turbo's right behind the cab where the mufflers are currently. The intercooler would be mounted right behind the cab as well running a 4" charge pipe back up through the cab to the motor using a 105mm TB on a 90* turn towards the passenger side. I currently have a ported Super Vic that matches my PRC 237's.
Not only will packaging be easier behind the cab, but I won't have to run plumbing to the A/W intercooler from the front to back and then back forward. I understand this might slow spool a bit but I have a glide with t-brake as well as a 2 step so I don't see any reason I wont be able to get some spool out of it at the line, plus the inches I am sure will help.
Couple things I am wondering about and would like input on.
I previously had edelbrock 1 3/4 stepped to 1 7/8 headers but switched to 2" do to the PRC 237 heads having an exhaust port cross section of 1 3/4. The old headers clipped the ports some. While the move to 2" for NA/N20 proved successful, I am thinking about going back to the smaller headers and reducing piping post headers to 2 1/2" in to the turbos.
Currently I have an X-pipe, it would be easy to do another x-pipe with the 2 1/2" piping, but would there be any benifit? I know it adds a couple feet of tubing which could be a downfall, but wasn't sure if balancing the exhaust preturbo would have any benefits.
Any thoughts, comments, suggestions are welcome. Please keep in mind, this is very limited street use and 95% track use.
Parts are:
PT6768's
Dual Bell 4 1/2" x 16" x 10" cores
PW46 Waste Gates
XSPower 50mm BOV
E-boost 2 controller
Motor is currently a 13-1cr 418, but that will be changing when I go to a 6 bolt block. Adding a few cubes as bore will be a 4.1" but compression will be coming down with the new piston.
I have a lot of room in the back of my truck. The current thought is to do a mid mount turbo set up with a dual air to water intercooler. I would hang the turbo's right behind the cab where the mufflers are currently. The intercooler would be mounted right behind the cab as well running a 4" charge pipe back up through the cab to the motor using a 105mm TB on a 90* turn towards the passenger side. I currently have a ported Super Vic that matches my PRC 237's.
Not only will packaging be easier behind the cab, but I won't have to run plumbing to the A/W intercooler from the front to back and then back forward. I understand this might slow spool a bit but I have a glide with t-brake as well as a 2 step so I don't see any reason I wont be able to get some spool out of it at the line, plus the inches I am sure will help.
Couple things I am wondering about and would like input on.
I previously had edelbrock 1 3/4 stepped to 1 7/8 headers but switched to 2" do to the PRC 237 heads having an exhaust port cross section of 1 3/4. The old headers clipped the ports some. While the move to 2" for NA/N20 proved successful, I am thinking about going back to the smaller headers and reducing piping post headers to 2 1/2" in to the turbos.
Currently I have an X-pipe, it would be easy to do another x-pipe with the 2 1/2" piping, but would there be any benifit? I know it adds a couple feet of tubing which could be a downfall, but wasn't sure if balancing the exhaust preturbo would have any benefits.
Any thoughts, comments, suggestions are welcome. Please keep in mind, this is very limited street use and 95% track use.
10-06-2014, 03:34 PM
#3
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I would keep the exhaust piping, pre turbo as equal length as possible. 2.5" should do fine, but 2.75 might be better considering the size of the turbos... What is the A/R on them? About the intercooler... I wouldn't even use one on a rear turbo setup because of the legth of the piping, the air will cool on the way back to the intake, just use aluminum piping. Typically you want to use bigger cold side piping than hot side, but not sure if that would benefit on the rear turbo setup. One more thing, you should ditch those BOV's and buy Tial or Turbosmart units.
10-06-2014, 05:34 PM
#6
Martin,
I am not 100% sure about the CR just yet. I am thinking somewhere around 10-1 but that is open for suggestions as well.
Yes, I will be sticking with E85. Most likely pump E85 on anything <10psi but will buy a drum of E98 and mix it down with unleaded 100 octane when I turn the boost up.
Rich,
IMO even a rear mount (mine will be mid mount) could benifit from a A/W intercooler. Lower IAT's can only be a benefit.
I am not 100% sure about the CR just yet. I am thinking somewhere around 10-1 but that is open for suggestions as well.
Yes, I will be sticking with E85. Most likely pump E85 on anything <10psi but will buy a drum of E98 and mix it down with unleaded 100 octane when I turn the boost up.
Rich,
IMO even a rear mount (mine will be mid mount) could benifit from a A/W intercooler. Lower IAT's can only be a benefit.