Falix 22 Report post Posted March 3, 2017 Yep, really. Found here: Just like a Legacy GTB!!!! So cool. Share this post Link to post Share on other sites
Paul 442 Report post Posted March 3, 2017 Oh that's awesome. Share this post Link to post Share on other sites
TTR 509 Report post Posted March 3, 2017 Well that's gotta be pretty fucking pointless Does look cool though. Share this post Link to post Share on other sites
Falix 22 Report post Posted March 3, 2017 30 minutes ago, TTR said: Well that's gotta be pretty fucking pointless Does look cool though. How? According to the poster it has rods, and they look like 40mm units, so I bet it spools seriously quick with the right trim blades! Possibly more efficient than the Aussie twincharged one to boot. Share this post Link to post Share on other sites
TTR 509 Report post Posted March 3, 2017 23 minutes ago, Falix said: How? According to the poster it has rods, and they look like 40mm units, so I bet it spools seriously quick with the right trim blades! Possibly more efficient than the Aussie twincharged one to boot. Unnecessary added weight and complexity. Not to mention that each turbo would only have 2 exhaust ports to scavenge from. Share this post Link to post Share on other sites
nerdstrike 186 Report post Posted March 3, 2017 People wanted to get rid of the twin system in the late RX7s! Google the vacuum tubing diagram for a mere taste of the complexity! I suppose the advantage of two smaller turbos is to flow as well as a double capacity turbo with lower inertia. It will also have pretty prompt response off what I hope are very short exhaust headers, rather than collecting 4-1 first. It's nicely packaged for sure! Reddit points out no intercooler. Share this post Link to post Share on other sites
Kodename47 446 Report post Posted March 3, 2017 Unnecessary extra heat due to placement, no real advantage over a decent spec'd single turbo, like a twin scroll. For the cost of an extra turbine I would expect that getting a variable vane system operational would be a better solution. I can understand a twin setup if you run 2 banks of cylinders as you get the separation of the manifolds and more cylinders per turbine. This is very much something done for the sake of it, not because it's optimal. Share this post Link to post Share on other sites
nerdstrike 186 Report post Posted March 3, 2017 Absolutely, were I to ever boost mine, I'd opt for a best engineered single turbo I could afford. I do admire the elegance though. Good use of space. Share this post Link to post Share on other sites
UKDucatiman 3 Report post Posted March 5, 2017 No, Cosworth SC every day of the week and twice on Sunday Share this post Link to post Share on other sites
Keethos 842 Report post Posted March 5, 2017 Are they the same size turbos or is one bigger than the other? Share this post Link to post Share on other sites
Falix 22 Report post Posted March 7, 2017 Both the same size apparently Share this post Link to post Share on other sites
Keethos 842 Report post Posted March 7, 2017 Then what's the point? I can understand two sizes to help minimise lag so one spools sooner than the other, and as mention, if you have separate intakes, a turbo per side..... What are the benefits of this system? Sent from my EDI-AL10 using Tapatalk Share this post Link to post Share on other sites
TTR 509 Report post Posted March 7, 2017 19 minutes ago, Keethos said: What are the benefits of this system? Scene points 2 Ztox and Lowe reacted to this Share this post Link to post Share on other sites
nerdstrike 186 Report post Posted March 8, 2017 Besides swagger, you might get better lag behaviour because the pickup can be nearer the exhaust ports, i.e. short effective manifold length. I can't easily find a straight answer on whether two half capacity turbos will have lower rotating inertia versus one full capacity turbo. Thermal efficiency might be higher for the smaller turbines, i.e. less total heat from the compression... so maybe your charge arrives cooler.... it's too complex to estimate without some proper reading and data, but I'm thinking it's marginal. Share this post Link to post Share on other sites
Falix 22 Report post Posted March 9, 2017 essentially you're treating it as 2x2cyl engines with a common crank, so the turbos must be sized for the optimum exhaust output of each bank. I'd guess 2x smaller units have a better turbine angle that spool at a lower RPM and combined still deliver the same as a big single. The main drawback aside from thermal efficiency and lack of charge cooling, is cost. 2 smaller units all plumbed is gonna be more than one bigger one. I'd rather get a variable vane big blower myself, and run anti-lag if spool is a concern. Share this post Link to post Share on other sites
CHOSENMAN007 81 Report post Posted March 9, 2017 id rather go twin charge than twin turbo. its been proven you work well. 2 turbos potentially double power output of a single turbo (theoretically) and gives you 1 upmanship i suppose. Share this post Link to post Share on other sites
