Reply to thread

Message: [QUOTE="madpowerstroke, post: 368847, member: 5867"] I have been doing some serious research on why the powermax turbo needs some tuning and other times not. I have one tester out there I'm trying a theory on and will have another be end of the month. I got my hands on a powermax turbo that a guy sent me to see if I could get it running without and special tunes. He's has a 05 truck and said that it's laggy, and dead spots at 45-50 if he hits it. I told him sure send it to me and I'll see what I can do. So I got the turbo and completely tore it down, measured everthing to see how it compairs to one of the stage 1. Well I found out alot of things, and also came up with a theory on the subject. The only differance between the two turbos is the turbine wheels, powermax 10 blade, and stage 1 13 blade, both same measurments. So, here's the theory and I have talked it over with some of the tuners and they agreed that it could possibly be right. I have also talked to guys with 03-04 early trucks with the 10 stock turbo, and they have said I have no problems at all. Then I have talked to guys with 04-07 and they say that the powermax needs tuning or it won't work right. What I came up with and I'm not hating the powermax over turbos I build, and I'm not saying stage 1 is better, the powermax can flow more air than the stage 1 but needs to be tuned for it, it is just a theory. The 04-07 trucks run a 13 blade turbine wheel from factory, and the backpressure is a little higher because of it so the PMC uses a set ratio between air flow, boost and backpressure. Now you put a bigger turbo in that flows more air but has a 10 blade wheel( less backpressure ratio per volume of air) well the engines computer PMC doesn't like the ratio and is out of it operating range, so it does know how to figure the calulations, and that's why you need the tuning, where the 13 turbine blade wheel has a ratio that is within the range and can calulate what it needs to make engine run good. This is a theory I could be wrong, and I'm trying to get the facts by putting a 13 tubine wheel in some powermaxs to see what happens.When I get the feedback I will post on this thread, to see if I was right or wrong. I would like to open for discussion this theory and get everone's option onit. Makes you think about the way the PMC thinks in these trucks and may helpout with tuning and performance. Like I said I have talked to a few tuners on this and they say that the PMC is always looking at the ratio and does use it for calulations for the way the engine runs. I also know that I came off on a thread to look like a dush, and for that I'm sorry, I'm only trying to help 6.0 owners, to make their trucks run good if I can. I also have no problem helping vendors if I can, I work with JJ but I will helpout anyone I can. I know alittle about some things and none about others, so I'm always learning and sharing what I know to help out the 6.0 owners. Thanks [/QUOTE]