big-phil Posted May 11, 2006 Share Posted May 11, 2006 Have the exhaust of one turbo feeding another turbo. Would this work on an L6 turbo? http://cgi.ebay.com/ebaymotors/Dodge-Cummins-Diesel-BD-Twin-Turbo-Turbos_W0QQcmdZViewItemQQcategoryZ33742QQitemZ8065339438QQrdZ1 Quote Link to comment Share on other sites More sharing options...
nienberg.11 Posted May 11, 2006 Share Posted May 11, 2006 Corky Bell described that type of setup in Maximum Boost. From what I gathered, the idea is to have a small turbo staged with a large one to get quick spool as well as big power. Quote Link to comment Share on other sites More sharing options...
stony Posted May 11, 2006 Share Posted May 11, 2006 Its called sequential turbo... been around for a while smaller turbo helps eliminate lag till bigger turbo takes over later on Quote Link to comment Share on other sites More sharing options...
big-phil Posted May 11, 2006 Author Share Posted May 11, 2006 So lets say I keep my stock T3, fab the DP into say a t3/t4 or a holset? plumb both intakes into my FMIC then have the one going to the intake? Mmmmmmmmmmm This is the sort of thing that keeps me up at night! I think it would be cool if you could make it all fit. Quote Link to comment Share on other sites More sharing options...
big-phil Posted May 11, 2006 Author Share Posted May 11, 2006 would both turbos have waste gates? Or just the last bigger one?? Quote Link to comment Share on other sites More sharing options...
TimZ Posted May 11, 2006 Share Posted May 11, 2006 would both turbos have waste gates? Or just the last bigger one?? In this implementation, the small turbo's wastegate feeds the big turbo, which has a conventional wastegate... http://www.turbosmart.com.au/index.php?id=75 Seems to me that you would a really huge wastegate for the small turbo to be able to adequately feed the big one. Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted May 12, 2006 Share Posted May 12, 2006 how about a signle turbo bolted onto the stock manifold.. and another turbo midway downstream.. maybe in the tranny tunnel =) twin turbo.. just one at the manifold and one in the rear Quote Link to comment Share on other sites More sharing options...
Chewievette Posted May 12, 2006 Share Posted May 12, 2006 Here's a thread that I had a while back. While the topic is acctually turbo diesels there's a lot about sequential turbos... http://forums.hybridz.org/showthread.php?t=101515&highlight=sequential Quote Link to comment Share on other sites More sharing options...
big-phil Posted May 12, 2006 Author Share Posted May 12, 2006 ok this is really getting my intrest, would a T3 be a good first turbo? Then a t3/t4 or hole set? Quote Link to comment Share on other sites More sharing options...
nienberg.11 Posted May 12, 2006 Share Posted May 12, 2006 Use the k.i.s.s. method... keep it simple, stupid:wink:. I'm just messing with you Phil, but I think you'd find that it would be a lot of custom work for the results you'd get. Quote Link to comment Share on other sites More sharing options...
Clifton Posted May 12, 2006 Share Posted May 12, 2006 Acutally it's a compound setup. Diesels can run insane boost. Most turbos can only run a high 3:1 pressure ratio, some 4:1. If you plan to exceed the pressure ratio a turbo can run at, say 60 psi or about a 5:1 PR you can pressurize the inlet of the second turbo with 30 psi (3:1 PR) from the first turbo and then have the second turbo run 60 psi (still a 3:1 PR). Quote Link to comment Share on other sites More sharing options...
KunoZ Posted May 14, 2006 Share Posted May 14, 2006 They do the same thing on the Caterpillar C15 ACERT engine. Basically one small turbo driving another larger turbo with only one wastegate on the first small turbo. Quote Link to comment Share on other sites More sharing options...
2003z Posted May 14, 2006 Share Posted May 14, 2006 thats what the last supra had also. Quote Link to comment Share on other sites More sharing options...
Clifton Posted May 14, 2006 Share Posted May 14, 2006 thats what the last supra had also. Uh, no. They used sequential. On a sequential set up. 2 small turbo's are used. Only one turbo is used at low rpms for fast boost response, then the second turbo comes at higher rpm's to add volume. The first turbo doesn't blow through the second. Quote Link to comment Share on other sites More sharing options...
Hugh Posted May 14, 2006 Share Posted May 14, 2006 I wouldn't call the compressor outlet the "exhaust" but thats just my opinion. Compound on a Supra? I don't think so. The sequential setup was controlled on the turbine side, just like the RX7. You have to realize what that turbo setup is doing. You putting compressed air into a turbo, and compressing it further. The effect is pretty ridiculous for a typical engine. You gonna boost 40 psi or something? Also, if you must run a little turbo to spool a big one, but 100% of the air flow is coming out of the first compressor and into the second... then you're limited to the maximum flow capability of the first compressor to send air to the motor. Either that turbo will be a bottleneck, or get overworked and die quickly if its really small. Quote Link to comment Share on other sites More sharing options...
2003z Posted May 14, 2006 Share Posted May 14, 2006 Uh, no. They used sequential. On a sequential set up. 2 small turbo's are used. Only one turbo is used at low rpms for fast boost response, then the second turbo comes at higher rpm's to add volume. The first turbo doesn't blow through the second.wow, I always thought it did. Oh well, learn something new every day, thats why I read these boards. Quote Link to comment Share on other sites More sharing options...
dr_hunt Posted May 14, 2006 Share Posted May 14, 2006 And FYI the c15 cat acert engines are experiencing alot of turbo failures from what I've heard. The acert engine is designed for emissions compliance. Quote Link to comment Share on other sites More sharing options...
Some-Guy Posted May 14, 2006 Share Posted May 14, 2006 theres a guy in vancouver with a suburban that has 3 turbos like this and is capable of making 150psi, 1200 hp and 3400lbs of torque the truck is in petersons 4wheel.. wild stuff. I think it was in the tuff truck challenge 3 years ago...... its been awhile.Ohh it was also Diesal! Quote Link to comment Share on other sites More sharing options...
kilten_one Posted May 15, 2006 Share Posted May 15, 2006 http://www.ka-t.org/forums/viewtopic.php?t=7446&highlight= http://www.ka-t.org/forums/viewtopic.php?t=9031&highlight= http://www.ka-t.org/forums/viewtopic.php?t=11228&highlight= biturbo/sequencial KA24E was broken up into three threads Quote Link to comment Share on other sites More sharing options...
alexideways Posted May 27, 2006 Share Posted May 27, 2006 Doing something like that, I'd use a super charger to go with the turbo, like HKS did for the first gen. MR2 and there is a similar kit for the COOPER S but I don't know who makes it and they got pretty good nubers with that if I recall corectly. The thing in sutch complicated setups is first "extremely compressed air produces ALOT of heat (bigger intercooler)" and it requires alot of pipping thus increasing total system volume "LAG" Quote Link to comment Share on other sites More sharing options...
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