nmeone Posted April 26, 2015 Share Posted April 26, 2015 I am in the process of figuring out the best way to route the downpipe of my LS1 280z. Quick info: 02 GTO 5.7 LS1 BW S475 E-85 setup with twin 485 Sump Pump Tial 50mm BOV Precision PW46 Wastegate Has a 9" Rear on it from a nascar truck 5SP TKO Hoping to make 700+ on E85 and buliding a IRON Block 6.0 on the side and make 1000+ with that later on. I am going to be using the truck manifold and welding a 2.25" vband on each end of it and merging it together with to a T6 flange. I have looked at various projects including SUNNY Z but he is using a custom mount which gives him plenty of room. the closest thing that resembles my build would be MISTAFOSTA turbo build. It seems to be a very tight fit no matter how i orient the truck manifold (aiming up or down). I was planning on going through the driver side with a 3.5" but it would be very close to the steering rod and brake lines. If i went down the passenger side it would be very close to the starter. Am i going to have to settle for a oval type and transtion back to round setup or even worse a 3" downpipe? I definitely do not want to dump it out the hood or to the side. Any suggestion would be greatly appreciated. Quote Link to comment Share on other sites More sharing options...
mistafosta Posted April 26, 2015 Share Posted April 26, 2015 There is a ton of clearance under the starter without compromising ground clearance. I only run a 3.5" exhaust through there though. Are you planning on a dump pipe also, or just the full exhaust? Quote Link to comment Share on other sites More sharing options...
thezguy Posted April 27, 2015 Share Posted April 27, 2015 X2 I run twin turbos and have 3" pipes running on both banks down and out the rear. You need to get more creative. Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted April 27, 2015 Share Posted April 27, 2015 If you solid mount motor you can get away with very little clearance around exhaust parts. Quote Link to comment Share on other sites More sharing options...
nmeone Posted April 27, 2015 Author Share Posted April 27, 2015 as of right now I am planning on doing full exhaust, and dumping the waste gate straight down. I might do a cut out to dump straight down but that's if I can't get at least a 3.5" down and to the back. Quote Link to comment Share on other sites More sharing options...
nmeone Posted May 13, 2015 Author Share Posted May 13, 2015 So my friend and I started to mock up the kit and we found it is possibly to get at least a 4" downpipe routed through on the driver side next to the steering rack. Will post picture soon. Quote Link to comment Share on other sites More sharing options...
nmeone Posted May 13, 2015 Author Share Posted May 13, 2015 My friend and I have started to mock up the turbo. He does all the welding since my welds looks more like popcorn then welds. Down pipe will be routed down the driver side right under the truck manifold. Turbo is a S475 75/83 with a 1.10 AR which should spool pretty fast on this setup. We used truck manifolds and cut the flanges off and welded it to 2.25" stainless bends into a T6 collector. Wastegate is a Precision 46mm and BOV we are using a Tial MVR 44. The power goals right now is right around 600-700 rwhp on E85 on the relatively stock 5.7 LS1. Next motor would be a LQ9 fully built for right around 1000+rwhp on E85 as well. This car will be a strictly E-85 car running 127lb Bosch injectors or ASNU 1650cc w/ dual external walbro 485 pumps. The stock pump will supply a reservoir which will house the dual 485's running at 4bar. For cooling we are using a Griffin radiator mounted a little slanted to fit the turbo. Inter-cooler will utilize either a Bell or Precision Core ( haven't figured out the biggest we can go yet, some suggestions would be greatly appreciated) Car currently has a solid 9" rear with a Tremec TKO w/OD on it. I am converting all the gauges except the speedo to defi units just like the starroad 240z. I will update this as much as possible. Any input or suggestion would be great feedback. Thanks. Quote Link to comment Share on other sites More sharing options...
nmeone Posted May 13, 2015 Author Share Posted May 13, 2015 I will also have a set of JCI headers for sale at a great price since I no longer need them on my setup. Quote Link to comment Share on other sites More sharing options...
thezguy Posted May 15, 2015 Share Posted May 15, 2015 (edited) Nicely done. I wouldn't be surprised if you have Boost creep issues with that Waste gate placement though. My advice is re locate it, Put a huge gate there or add another one. Edited May 15, 2015 by thezguy Quote Link to comment Share on other sites More sharing options...
mistafosta Posted May 15, 2015 Share Posted May 15, 2015 Nicely done. I wouldn't be surprised if you have Boost creep issues with that Waste gate placement though. My advice is re locate it, Put a huge gate there or add another one. 2nd that one. I run dual MV-R 44mm and don't have any issues, but a single is generally not enough. Either a single 60 or dual 38+ are a good idea. The single 60s can be a little hard to control without co2 though sometimes, Quote Link to comment Share on other sites More sharing options...
nmeone Posted May 17, 2015 Author Share Posted May 17, 2015 if it does creep i'll add another precision 46mm on it. Quote Link to comment Share on other sites More sharing options...
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