Big respect for coming back and updating with this - wish more people did when they have debated against something they eventually decide/learn otherwise, helps make development of bigger better things easier if info is "clearer" when researching for new builds.

 

Holly smokes Walker
Need more pictures and who makes 321 16G bends with such a tight radius?

 

1 3/4" tubing. Tightest bend is on a 2" radius. A couple places I checked carried this radius.

 

Definitely a beauty. Looks like it ended up with both a great primary length and a good length collector setup. Is that a scratchbuilt collector(s)?

 

I have known this for awhile (from our drag car) but had issues tracking this thread down. After the last car I did where the spool was increased phenomenally and the fact that I have been planning on going to a big TS setup on my car, it seemed the correct thing to do.

I had originally planned a 3794 with a 1.15 TS, then kind of had to drop to a stock turbo with the auto, and am going to split the middle with a 60mm and 3 possible housings.

The new turbo will be on a long tube T4 divided top mount. It is an older BW S360 (new turbo, older design) with a 0.91, 1.00, and 1.10 housing option. I am switching to an AEM as well so I can log backpressure on each scroll and see what if any differential there is and when it hits 1:1+. The S360 uses a LARGE turbine though, I am not expecting to see any issues till I am above 30psi on the 0.91 a/r housing.

 

I got lazy on the collectors and ordered them from SPD. I used to make them all the time, but these SPD units are so frikin' nice, and it saves lots of time/effort when building a header like this.

 

Pulled it apart yesterday, and everthing is just as it was. The 321 seems to be holding it's ground. I went ahead and re-measured the air gap between the valve and divider, and all that checks out as well. The first one I built, I didn't allow enough room for thermal expansion of the divider and after a few pulls it got laggy. I could hear exh. exiting the dump at idle and quickly realized where I'd gone wrong.

 

Aaron, great to see you reviving this post thanks for your honesty it is a great service to the community.

The 60mm inducer S300SX borgwarner turbo is a good unit. BW turbine wheels seem "large" on paper but thats because they are designed around max flow efficiency, rather than smallest diameter. Also i assume yours has the flat tipped turbine wheel, whereas it might be beneficial for you to be on the cupped tip wheel since you mentioned youre already considering the 1.10 a/r

im traveling for PRI but if you have any questions shoot me an email ill try to help geoff[at]full-race[dot]com

 

We'll be at PRI as well. I do remember reading about the cupped wheel versus flat wheel but I am not sure what this came with. I presume you are correct and it was just the flat tipped one.

PN 177272

 

ok yes thats the standard flat tipped turbine. try and say hello at PRI, what days will you be there?

 

Thursday night, then friday and saturday at the show, leave sunday. Will you be at the BW booth or floating around?

Aaron

 

yes i will be working in the BW booth most of the show. I have a couple meetings in other places but for the most part ill be there!

even tho im a Ford EcoBoost guy now, the new 2.0L GM turbo engine details were just released: http://media.gm.com/media/us/en/gm/p...ail.print.html pertinent to this discussion

excerpt: An all-new 2.0L turbo engine debuts in the ATS, advancing a legacy of high-performance turbo engines with greater efficiency and more technology. Along with its 272 horsepower (203 kW), the 2.0T’s torque curve is broad and robust, delivering 90 percent of its peak 260 lb.-ft. of torque (353 Nm) from 1,700 rpm to 5,500 rpm – for a great feeling of immediate power at all speeds.

The turbocharger generates up to 20 pounds of boost and its twin-scroll design helps optimize the usable power from the engine, virtually eliminating turbo lag and helping deliver a broad power band. It also gives the engine the rapid throttle responsiveness associated with a higher-displacement, naturally aspirated, high-performance engine.

 

Interesting. Luke was mentioning something about the ATS on the plane ride home last night. A 4 cyl Caddy...amazing

 

A 4cyl. Cadillac? Memories of the Cimarron come to mind J/K I'm sure there won't be a repeat of that debacle

 

soooo what do you guys think of a twin scroll 6466 with a 1.15 ar