Testament Posted November 14, 2012 Share Posted November 14, 2012 from what I see there, the lager compressor has to force the air through the smaller one yes? this will be a restriction to maximum flow/power - whether its material or not is a matter of details though. Yes, I agree Quote Link to comment Share on other sites More sharing options...
Rookie Posted November 14, 2012 Share Posted November 14, 2012 I understand what is happening and it's not the same as a twincharge setup, you don't get the benefits of the supercharger so it's pretty pointless unless you want big boost. Yes, I agree because you are right. Quote Link to comment Share on other sites More sharing options...
Rookie Posted November 14, 2012 Share Posted November 14, 2012 I should probably justify my comment, as it's a bit douchey just saying you are wrong. The reason that compound turbos aren't the be all and end all for creating boost is because of the large amount of back pressure that they create, as well as the the fact that the small turbo robs a lot of the energy out of the exhaust gas, thereby making the large turbo even slower to spool up. I understand that you have less lag down low and that is a good thing but in the grand scheme of things you won't care about 10psi being made by a t25 when you have 30psi being made by a hx55, not to mention that the only reason that you would want 40 psi is because you are drag racing( or you have a diesel that needs 100psi, like I said this setup is good for making big boost....), and even then there are better methods for getting a drag car on boost. The reason why a true twincharge setup is awesome is because of the positive displacement supercharger, the blower means that the back pressure ratio is positive, something which you simply can't do with a turbo. This in turn means that you have better cylinder filling, can run more aggressive cams, and also it means that you have a greater resistance to knock as you don't have a contaminated intake charge. Quote Link to comment Share on other sites More sharing options...
KKtrips Posted November 15, 2012 Share Posted November 15, 2012 I haven't read this thread in ages but I just saw this in the random pic thread and thought I would slot it in here.. (may already be in the thread but I ain't going to read 8 pages to find out..LOL) 1 Quote Link to comment Share on other sites More sharing options...
Rookie Posted November 15, 2012 Share Posted November 15, 2012 Yuh, that is the right way to do it, Lancia knows whats up. 1 Quote Link to comment Share on other sites More sharing options...
KKtrips Posted November 15, 2012 Share Posted November 15, 2012 If I was going to listen to any manufacturer with supercharger experience I would listen to Lancia as they seem to have competed fairly well with their set up.. Quote Link to comment Share on other sites More sharing options...
flyingbrick Posted November 15, 2012 Share Posted November 15, 2012 dunno if it's been covered but mk4 supra 2j TT setup is excellent. it basically does everything you need in a twin charge setup and is reliable and efficient. two turbos the same size. one turbo from idle. then exhaust gas gets diverted to pre spool second turbo. then second turbo comes online and they run together till redline. tiney dip in power as second turbo comes on but it's fuck all. I tested its action by rigging both turbos on mine to run together the whole time ( all shutoff valves open) and the lag/ lack of low down boost and tq was horrible in comparison Quote Link to comment Share on other sites More sharing options...
Rookie Posted November 15, 2012 Share Posted November 15, 2012 That's not compounding..... Quote Link to comment Share on other sites More sharing options...
durty Posted November 15, 2012 Share Posted November 15, 2012 isn't it just sequential which is completely different? Quote Link to comment Share on other sites More sharing options...
Rookie Posted November 15, 2012 Share Posted November 15, 2012 Yea, and has none of the benefits of compounding. Quote Link to comment Share on other sites More sharing options...
flyingbrick Posted November 15, 2012 Share Posted November 15, 2012 nm I'm duuuur Quote Link to comment Share on other sites More sharing options...
Llama Posted November 15, 2012 Share Posted November 15, 2012 I haven't read this thread in ages but I just saw this in the random pic thread and thought I would slot it in here.. (may already be in the thread but I ain't going to read 8 pages to find out..LOL) Can someone explain what the feed going from just before the inlet plenum to the little dodacky then to after the intake is for? Quote Link to comment Share on other sites More sharing options...
Beaver Posted November 15, 2012 Share Posted November 15, 2012 blow-off valve isnt it? Quote Link to comment Share on other sites More sharing options...
durty Posted November 15, 2012 Share Posted November 15, 2012 blow-off valve isnt it? Pretty sure Quote Link to comment Share on other sites More sharing options...
Rookie Posted November 15, 2012 Share Posted November 15, 2012 Yes, and the bypass around the blower is for idle stabilization. Quote Link to comment Share on other sites More sharing options...
Llama Posted November 15, 2012 Share Posted November 15, 2012 Oh ofc. Duh. Quote Link to comment Share on other sites More sharing options...
GT_Escortina Posted March 12, 2015 Share Posted March 12, 2015 For a start sorry for bring up old post(google brought me here) Ive loved the idea of the compound charged set up after see this After half pie reading this thread the Lancia set up looks the easiest. Anyone able to put togetter a turbo , superchager and ecu (megasquirt? or something user friendly)combo for the following? engine ej20 20-25 psi max next to no lag or the use of a anti lag keep in mind this is on a low budget (pickapart or trademe finds) with $$ spent on ecu to run it all Just curious.Thanks 1 Quote Link to comment Share on other sites More sharing options...
Rookie Posted March 12, 2015 Share Posted March 12, 2015 You could use a moo supercharger and I would say something like a gt35 turbo, just off the top of my head. Quote Link to comment Share on other sites More sharing options...
Roman Posted March 12, 2015 Share Posted March 12, 2015 Even better, just never turn the supercharger off. Free up a few HP worth of parasitic loss by doing so though? Hmmm when the main selling point of a boxer engine is the low COG, strapping all this extra stuff on top of it seems to mitigate that benefit a bit. And sweet jebus I can not think of a more horrifying clusterfuck of pipes and misery than trying to troubleshoot a problem with a twin charged boxer setup. I think I'd rather just antilag it and deal with the turbo replacement intervals haha. 3 Quote Link to comment Share on other sites More sharing options...
Rookie Posted March 12, 2015 Share Posted March 12, 2015 Get out of here Roman. 1 Quote Link to comment Share on other sites More sharing options...
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